DE202022101554U1 - Flow regulation, water control and acidification complete device for oil and gas wells - Google Patents

Abstract

Flow regulation, water control and acidification complete equipment for oil and gas wells, comprising:
a flow regulation and water control screen tube; the screen tube having a base tube, a screen portion disposed on the base tube, and a flow regulation and water control portion connected to the screen portion; wherein the screen member is used to filter a formation fluid; and wherein the flow regulation and water control member is connected to the underflow of the screen member to increase the resistance to flow of water in the formation fluid; and
an inflow mechanism connected to the flow regulation and water control screen tube; wherein in the inflow mechanism there are arranged a central passage connected to the base pipe and an acidification hole for connecting the central passage to the outside of the inflow mechanism; and wherein the inflow mechanism is configured to manipulably open and close the acidification hole by pushing from outside the well.

Description

TECHNICAL AREA

The present invention relates to the technical field of development of oil and gas wells and relates to the segmented flow regulation and water control and segmented acidification of the oil and gas wells and the oil and gas production technologies, particularly a suitable device for flow regulation, water control and acidification for oil and gas wells, in particular a flow control, water control and acidification complete device for oil and gas wells.

STATE OF THE ART

As the world's energy needs continue to increase, the development of deep complex natural gas and dense oil and gas is increasingly becoming the focus of global fossil fuel exploration and development. However, in the development of many complex oil and gas reservoirs, one is often exposed to the influence of acidic H2S and CO2 gas, and most oil and gas wells or wells contain highly toxic H2S gas. In order to increase the output of a single well and reduce the input to output ratio, many deep oil and gas reservoirs use long horizontal wells for completion. As the layout of the oil and gas wells extends from the main block to the peripheral blocks, the physical properties of the reservoir are relatively degraded. To improve the yield of the single well, this long horizontal well usually requires acid fracturing and pickling operations. In some blocks, the cylinder of the horizontal well is more than 1,000 meters long. Due to the permeability anisotropy and rock heterogeneity of the long horizontal well, the effect of general acid fracturing and pickling operations is not obvious and it is usually necessary to perform segmented acid fracturing and pickling operations to increase the yield of a single well.

Currently, the integrated tubing string is typically used for segmented acid fracturing and production. However, as the oil and gas field development enters the middle and late stage, the water production from oil and gas wells increases, and the water production and flooding of oil and gas wells are the key to affecting the yield of the whole Due to the long length of the horizontal well borehole, the oil and gas yields in different segments of the horizontal well will be different due to rock heterogeneity and permeability anisotropy along the horizontal well borehole after a certain producing time or production time of the integrated pipe string to segmented acid fracture and production . Because the boundary line of the oil and gas reservoir outside the control area of the horizontal well borehole is relatively complicated, and is not necessarily a straight line or a straight plane parallel to the horizontal well borehole, if there are strong edge water or water at the edge and bottom water, the whole horizontal well borehole will be or water around at the bottom and once a certain horizontal segment of water is filled or irrigated or broken, soon flooded by water, which in turn causes the water to close up the well borehole and oil and gas are not produced smoothly be able. This affects the yield of oil and gas wells. This requires consideration of the problem of segmented water control during well completion. Because deep complex oil and gas reservoirs generally contain high levels of H2S, the general process of oil and gas well completion requires that after the heavy mud kill fluid has been brought in or dumped, the well completion process is completed in one operation as much as possible is used to prevent H2S accidents. It is not recommended to raise and retract the pipe string multiple times during completion to avoid the H2S at the bottom of the well overflowing the wellhead and causing serious accidents. For this reason, the operating modes in which the production and water control line is retracted or retracted after segmented acid rupture cannot be implemented.

In order to efficiently develop complex and deep oil and gas reservoirs rich in acid gas, it is necessary, based on segmented acid fracture and considering balanced gas production in later stages, in water control to prevent fringe barriers and bottom water and the risk of high H2S operations to use an integrated piping string to the acid fracture and water control and supporting technology suitable for the high H2S gas well to complete by driving in the integrated piping string to complete. The pipe string only needs to be driven in to achieve an effective segmented acid fracture and to communicate with the deposit. At the same time, the production can be realized and can effectively realize segmented water control during the production process, balance the output speed of gas of different segments, and prevent the blocking speed of or fast blocking by edge and bottom water outside the control range of different segments, to achieve an integrated acid break, production and water control in one to implement the work process. This saves process costs. At the same time, the production and operational safety of complex deep oil and well boreholes is ensured to the highest degree.

CONTENT OF THE PRESENT INVENTION

In view of the above deficiencies, it is an object of the present invention to provide a flow regulation, water control and acidification completion device for oil and gas wells, whereby through one operation a tooling device with integrated functions for segmented acid fracture completion and production as well as Water pressure control or water control and a piping system are retracted to overcome the problem that the integration of segmented acid fracture, flow regulation and water control cannot be realized by one operation. An object of the present invention is to provide a flow regulation, water control and acidification complete equipment for oil and gas wells, by running in the tubing at the same time the production function of the original tubing after acid break is realized and having an effect is achieved in water control and preventing the oil and gas well from being blocked by edge and bottom water, so as to extend the production time of the oil and gas well with low water content and increase the production rate of the oil and gas well. This reduces the number of operations and saves process costs.

Another object of the present invention is to provide a flow regulation, water control and acidification completion device for oil and gas wells to prevent the production of corrosive gas during the completion process to the highest degree, ensure the safety of the production operations and the to realize the highest recovery rate of the control area of complex horizontal oil and gas wells with high hydrogen sulfide content. In this way optimization of completion and production of deep complex oil and gas wells is realized.

• eine Durchflussregulierungs- und Wasserkontrollsiebröhre; wobei die Siebröhre ein Basisrohr,
• ein an dem Basisrohr angeordnetes Siebteil und ein mit dem Siebteil verbundenes Durchflussregulierungs- und Wasserkontrollteil aufweist; wobei das Siebteil dazu verwendet wird,
• eine Formationsflüssigkeit bzw. gebildete Flüssigkeit zu filtrieren; und wobei das Durchflussregulierungs- und Wasserkontrollteil mit dem Unterlauf des Siebteils verbunden ist, um den Strömungswiderstand von Wasser in der Formationsflüssigkeit zu erhöhen; und
• einen mit der Durchflussregulierungs- und Wasserkontrollsiebröhre verbundenen Einströmungsmechanismus; wobei in dem Einströmungsmechanismus ein mit dem Basisrohr verbundener zentraler Kanal und ein Versauerungsloch zum Verbinden des zentralen Kanals mit dem Äußeren des Einströmungsmechanismus angeordnet sind; und wobei der Einströmungsmechanismus dazu konfiguriert ist, durch Drücken von außerhalb des Brunnens das Versauerungsloch manipulierbar bzw. handhabbar zu öffnen und zu schließen.

In order to achieve at least one of the above aims, the present application uses the following technical solution: a flow regulation, water control and acidification complete device comprising:

• a flow regulation and water control screen tube; wherein the sieve tube is a base tube,
• a screen portion disposed on the base tube and a flow regulation and water control portion connected to the screen portion; whereby the sieve part is used to
• filtering a formation fluid; and wherein the flow regulation and water control member is connected to the underflow of the screen member to increase the resistance to flow of water in the formation fluid; and
• an inflow mechanism connected to the flow regulation and water control screen tube; wherein in the inflow mechanism there are arranged a central passage connected to the base pipe and an acidification hole for connecting the central passage to the outside of the inflow mechanism; and wherein the inflow mechanism is configured to manipulably open and close the acidification hole by pushing from outside of the well.

As a preferred embodiment, a disposable component is also arranged on the base tube; wherein the disposable component is configured to permit the liquid to flow from the strainer portion to the flow regulation and water control portion and prevent the liquid from flowing from the flow regulation and water control portion to the strainer portion.

As a preferred embodiment, the screen member comprises an outer protective cover, a filter net, a flow guide net, a (another) filter net, a (another) flow guide net and a backing layer which are sequentially fitted from outside to inside; circular through holes are distributed on the outer protective cover; wherein the flow guide network is used to guide the flow of the liquid; and wherein the filter net, the flow guide net and the backing layer are fixed by forging as a whole.

As a preferred embodiment, the flow regulation and water control part comprises an outer tube attached to the outside of the base tube and a flow regulator tion and water control element installed in the outer pipe on the wall of the base pipe; wherein a flow regulation and water control space is formed between the base tube and the outer tube; and wherein the flow regulation and water control element connects the interior of the base pipe to the flow regulation and water control space.

• eine in dem Außenrohr fest angeordnete Durchflusshülse, die den Durchflussregulierungs- und Wasserkontrollraum in der radialen Richtung in einen Innenraum und einen mit dem Siebteil verbundenen Außenraum unterteilt; wobei das Durchflussregulierungs- und Wasserkontrollelement den Innenraum mit dem Inneren des Basisrohrs verbindet; und wobei an der Durchflusshülse ein Verbindungsloch zum Verbinden des Innenraums und des Außenraums vorgesehen ist; und
• einen in dem Außenraum angeordneten, entlang der axialen Richtung verschiebbaren Sperrkolben und eine erste Stützfeder; wobei der Sperrkolben eine Sperrstellung zum Sperren des Verbindungslochs und eine Offenstellung zum Offensein bzw. Öffnen des Verbindungslochs aufweist; wobei die erste Stützfeder in der axialen Richtung den Sperrkolben in der Sperrstellung stützt; und wobei der Sperrkolben durch die Formationsflüssigkeit bzw. gebildete Flüssigkeit so geschoben bzw. verschoben werden kann, dass er sich von der Sperrstellung zur Offenstellung bewegt.

As a preferred embodiment, the flow regulation and water control screen is an incoming water control screen; wherein the disposable component comprises:

• a flow sleeve fixed in the outer tube and dividing the flow regulation and water control space in the radial direction into an inner space and an outer space connected to the screen part; wherein the flow regulation and water control element connects the interior space with the interior of the base tube; and wherein a communication hole for communicating the inner space and the outer space is provided on the flow sleeve; and
• a lock piston disposed in the outer space and slidable along the axial direction, and a first support spring; wherein the locking piston has a locking position for locking the communication hole and an open position for being open or opening the communication hole; wherein the first support spring supports the lock piston in the lock position in the axial direction; and wherein the blocking piston can be pushed or displaced by the formation fluid or formed fluid so that it moves from the blocked position to the open position.

As a preferred embodiment, the inflow mechanism is an inflow bullet rupture sliding sleeve connected to the lower end of the flow regulation and water control screen tube,
wherein the inflow bullet refraction sliding sleeve comprises an outer sleeve and an inner sliding sleeve slidably fitted inside the outer sleeve; wherein a central channel is formed inside the inner sliding sleeve and a ball seat is fixed; between the inner sliding sleeve and the outer sleeve a slider firmly connected to the outside of the inner sliding sleeve and a second support spring supporting the slider axially; the slider being fixedly connected to the outer sleeve by a shear pin; wherein the acidification hole is provided on the outer sleeve; the inner slip sleeve being secured via the shear pin in a position to shut off the acidification well; wherein when the ball seat is locked by the ball throw and by pushing the pressure in the central channel exceeds a certain pressure value, the ball seat drives the inner sliding sleeve and the slide to shear the shear pin and move to open the acidification hole, and wherein when you stop pushing, the second support spring pushes the inner sliding sleeve to lock the acidification hole again.

As a preferred embodiment, an upper terminal is connected to the upper end of the outer sleeve and a lower terminal is connected to the lower end of the outer sleeve; wherein the position at which the inner sleeve blocks the acidification hole is such that the upper end of the inner sleeve seals
in the upper connection and the lower end of the inner sliding sleeve is sealed in the lower connection.

As a preferred embodiment, the flow regulation, water control and acidification device is a channel switching tubing string for flow regulation, water control and segmented acidification;
wherein the inflow water control screen tube and the inflow bullet refraction slide sleeve form a flow regulation, water control and acidification component; and wherein the channel-switching flow control, water control, and segmented acidification tubing string includes an upper packer, multiple flow control, water control, and acidification components, an isolation packer connected to two adjacent flow control, water control, and acidification components, a wellbore isolation valve, and two-stage floats .

As a preferred embodiment, the flow regulation and water control strainer is a one-way valve type water control strainer; wherein the disposable component is fitted between and surrounding the outer tube and the base tube to divide the flow regulation and water control space along the axial direction into a first axial space connected to the strainer part and a second axial space connected to the flow regulation and water control member spaced apart from each other are to subdivide;
wherein the one-way component includes a first one-way ball seat and a second one-way ball seat coupled along the axial direction; wherein along the flow direction of the formation fluid or formed fluid the first one-way ball seat is arranged upstream of the second one-way ball seat, the first one-way ball seat distributed in the circumferential direction first having a first number of passages, the second one-way ball seat having a greater number than the first number of second passages distributed in the circumferential direction; wherein the second first plurality of channels and the first first plurality of channels are aligned in the axial direction one after the other, the remaining number of second channels being offset from the first channels; wherein, of the first passages and second passages aligned sequentially along the axial direction, a ball seat is disposed on the opposite snapped end portions of the first passages and the second passages, respectively, and a check valve ball is disposed in the opposite snapped ball seats.

• einen Schiebehülsenkörper, an dem das Versauerungsloch vorgesehen ist; eine verschiebbar im Schiebehülsenkörper aufgesetzte bzw. eingesetzte obere Ventilsitz-Schiebehülse und eine unterhalb der oberen Ventilsitz-Schiebehülse befindliche untere Ventilsitz-Schiebehülse; wobei der Innendurchmesser der unteren Ventilsitz-Schiebehülse kleiner als der Innendurchmesser der oberen Ventilsitz-Schiebehülse ist, wobei die untere Ventilsitz-Schiebehülse über einen Scherstift in einer Stellung zum Sperren des Versauerungslochs positioniert ist; wobei die obere Ventilsitz-Schiebehülse über einen Scherstift oberhalb der unteren Ventilsitz-Schiebehülse positioniert ist; wobei die untere Ventilsitz-Schiebehülse nach dem Sperren durch Kugelwurf durch Druckkraft in die Stellung zum Öffnen des Versauerungslochs geschoben werden kann; und wobei die obere Ventilsitz-Schiebehülse nach dem Sperren durch Kugelwurf durch die Druckkraft in die Stellung zum erneuten Sperren des Versauerungslochs geschoben werden kann.

As a preferred embodiment, the inflow mechanism is a two-stage rupture-slide sleeve connected to the lower end of the one-way valve-type water control screen tube, comprising:

• a sliding sleeve body on which the acidification hole is provided; an upper valve seat slide sleeve slidably fitted in the slide sleeve body and a lower valve seat slide sleeve located below the upper valve seat slide sleeve; wherein the inner diameter of the lower valve seat pusher sleeve is smaller than the inner diameter of the upper valve seat pusher sleeve, the lower valve seat pusher sleeve being positioned via a shear pin in a position for blocking the acidification hole; the upper valve seat slide sleeve being positioned above the lower valve seat slide sleeve via a shear pin; wherein the lower valve seat sliding sleeve can be pushed into the position for opening the acidification hole by compressive force after locking by ball throwing; and wherein the upper valve seat sliding sleeve can be slid to the acidification hole blocking position again by the compressive force after ball throw blocking.

As a preferred embodiment, a lower terminal is connected to the lower end of the sliding sleeve body; a portion of the lower terminal protruding inside the lower end of the collet body has a terminal end; wherein the lower valve seat sliding sleeve, when pushed by the ball throw to contact the restricting end, is restricted in the axial direction by the lower port; wherein the upper valve seat sliding sleeve, when pushed by the ball throw to contact the lower valve seat sliding sleeve, is restricted by the lower valve seat sliding sleeve in the axial direction and blocks the acidification hole again.

As a preferred embodiment, the flow regulation, water control and acidification device is a one-way valve type flow regulation, water control and acidification tubing;
wherein the one-way valve type water control screen tube and the two-stage refraction sliding sleeve form a flow regulation, water control and acidification component;
and wherein the channel-switching flow control, water control, and segmented acidification tubing string includes an upper packer, multiple flow control, water control, and acidification components, an isolation packer connected to two adjacent flow control, water control, and acidification components, a wellbore isolation valve, and two-stage floats .

As a preferred embodiment, the flow regulation and water control strainer is an adaptive flow regulation and water control strainer comprising a strainer base pipe and a water control base pipe; wherein the screen base pipe and the water control base pipe are joined together to form a base pipe; wherein a guide channel is formed between the strainer and the base tube; wherein a connection component is fixedly connected to the outside of the base pipe; wherein the connection component is fixedly connected to the lower end of the outer protective sheath and the upper end of the outer tube; wherein a connection channel for connecting the guide channel and the flow regulation and water control space is provided on the connection component; wherein the water control base pipe is connected to the inner wall of the outer pipe at two axial ends of the flow regulation and water control space, respectively; wherein the water control base pipe is further provided with a pinch wall channel at the upper reaches of the flow regulation and water control space, and wherein a connection annulus is further provided between the upper end of the water control base tube and the connection component, which connects between the connection channel and the pinch wall channel.

As a preferred embodiment, the inflow mechanism is an inflow disruption passage component connected to the upper end of the flow regulation and water control screen tube, comprising: an outer cylindrical body; wherein, on the outer cylinder body, the acidification hole and a miniature check valve arranged in the acidification hole are arranged; an inner tube body fixedly fitted in the outer cylinder body; the interior of the inner tube body forming a central channel; wherein the central passage has a drain port communicating with the central annular space between the inner tubular body and the outer cylindrical body; further disposed in the central annular space is a rubber grommet which is fitted against the exterior of the inner pipe body and covers the drain opening; and wherein the grommet can open the drain opening when the pressure in the central channel exceeds a first preset pressure.

As a preferred embodiment, the miniature check valve comprises a valve body fixed in the acidification hole, a check plate fixed at the radially outer end of the valve body, a valve ball located in the valve body, and a spring located between the valve ball and the check plate; the radially inner end of the valve body having a valve body seat blocked by the valve ball.

As a preferred embodiment, the wall thickness of the rubber grommet along the axial direction from the top end to the bottom end is a stepped wall thickness; wherein the upper stepped wall thickness is greater than the lower stepped wall thickness.

As a preferred embodiment, the flow regulation, water control, and acidification device is an adaptive flow regulation, water control, and acidification tubing string; wherein the inflow fracturing passage component and the adaptive flow regulation and water control screen tube form the flow regulation, water control and acidification component;
wherein the adaptive flow regulation, water control and acidification tubing string comprises an upper packer and a plurality of flow regulation, water control and acidification components; an expansion packer being positioned above and below each of the flow regulation, water control and acidification components; and wherein the adaptive flow regulation and water control screen tube is further provided with a centralizer.

A flow regulation, water control, and acidification complete device for oil and gas wells, comprising: an upper packer, a plurality of flow regulation, water control, and acidification components, a wellbore shut-off valve, and a float, sequentially connected from top to bottom; wherein an isolation packer is positioned between each two adjacent flow regulation, water control and acidification components; wherein the flow regulation, water control and acidification component comprises a flow regulation and water control screen tube and an inflow mechanism connected to the flow regulation and water control screen tube; wherein the flow regulation and water control screen tube comprises a base tube, a screen portion disposed on the base tube, and a flow regulation and water control portion connected to the screen portion; wherein the screen member is used to filter the formation fluid; and wherein the flow regulation and water control member is connected to the underflow of the screen member to increase the resistance to flow of water in the formation fluid; wherein a disposable component is further disposed on the base tube; wherein the disposable component is configured to allow the liquid to flow from the strainer portion to the flow regulation and water control portion and prevent the liquid from flowing from the flow regulation and water control portion to the strainer portion; wherein in the inflow mechanism there are arranged a central passage connected to the base pipe and an acidification hole for connecting the central passage to the outside of the inflow mechanism; and wherein the inflow mechanism is configured to manipulably open and close the acidification hole by pushing from outside of the well.

Advantages: the flow regulation, water control and acidification complete device of the present publication realizes through a match between the flow regulation and water control screen pipe and the inflow mechanism, the production function of the original pipe string after the acid rupture, with an effect of water control and preventing the oil from being blocked - and gas well is achieved by or because of edge and bottom water, to extend the production time of the oil and gas well with low water content and increase the production rate of the oil and gas well, thereby reducing the operations and saving process costs, in which Multiple sets of flow regulation and water control screen tubing and inflow mechanisms are arranged in the tubing string, thereby enabling tooling with integrated functions for segmented acid fracture completion and production as well as water pressure control or water control and a pipe string system are run in to solve the problem to overcome that the integration of segmented acid break and flow regulation and water control cannot be realized through one operation.

The specific embodiments of the present invention are explained in more detail in connection with the following explanations and figures. It goes without saying that the scope of the embodiment of the present invention is not limited thereto.

The features explained and/or illustrated for one embodiment can be used in an identical or similar manner in one or more other embodiments, can be combined with the features in other embodiments or can replace the features in other embodiments.

It should be emphasized that the terms "comprising/having" when used in the specification refer to the presence of a feature, entity, step or component, however the presence or addition of a or multiple other features, wholes, units, steps, or components.

character list

• 1 zeigt eine schematische Strukturansicht eines Durchflussregulierungs- und Wasserkontrollelements eines Ausführungsbeispiels der vorliegenden Anmeldung.
• 2 zeigt eine perspektivische Ansicht gemäß 1.
• 3 zeigt eine schematische Strukturansicht eines Durchflussregulierungs- und Wasserkontrollelements eines anderen Ausführungsbeispiels der vorliegenden Anmeldung.
• 4 zeigt eine Schnittansicht gemäß 3.
• 5 zeigt eine perspektivische Ansicht gemäß 3.
• 6 zeigt eine schematische Strukturansicht eines Durchflussregulierungs- und Wasserkontrollelements eines anderen Ausführungsbeispiels der vorliegenden Anmeldung.
• 7 zeigt eine perspektivische Ansicht gemäß 6.
• 8 zeigt eine schematische Strukturansicht eines Durchflussregulierungs- und Wasserkontrollelements eines anderen Ausführungsbeispiels der vorliegenden Anmeldung.
• 9 zeigt eine perspektivische Ansicht gemäß 8.
• 10 zeigt eine schematische Strukturansicht eines Durchflussregulierungs- und Wasserkontrollelements eines anderen Ausführungsbeispiels der vorliegenden Anmeldung.
• 11 zeigt eine perspektivische Ansicht gemäß 10.
• 12 zeigt eine schematische Strukturansicht eines kanalumschaltenden Rohrstrangs zur Durchflussregulierung, Wasserkontrolle und segmentierten Versauerung eines Ausführungsbeispiels der vorliegenden Anmeldung.
• 13 zeigt ein schematisches Diagramm einer Halbschnittstruktur einer Wasserkontrollsiebröhre vom Typ des Einwegeventils gemäß 12.
• 14 zeigt eine schematische Querschnittsansicht gemäß 13.
• 15 zeigt eine schematische Strukturansicht eines Siebteils gemäß 13.
• 16 zeigt ein schematisches Diagramm einer Halbschnittstruktur einer Einströmung-Kugelwurf-Brechung-Schiebehülse gemäß 12.
• 17 zeigt eine schematische Querschnittsansicht gemäß 16.
• 18 zeigt ein schematisches Diagramm des Zustands eines Durchflussregulierungs- und Wasserkontrollteils gemäß 13 im Säurebruchprozess.
• 19 zeigt ein schematisches Diagramm des Zustands eines Durchflussregulierungs- und Wasserkontrollteils gemäß 13 im Produktionsprozess.
• 20 zeigt eine schematische Strukturansicht eines Durchflussregulierungs-, Wasserkontroll- und Versauerungsrohrstrangs vom Typ des Einwegeventils eines anderen Ausführungsbeispiels der vorliegenden Anmeldung.
• 21 zeigt ein schematisches Diagramm einer Halbschnittstruktur einer Wasserkontrollsiebröhre vom Typ des Einwegeventils gemäß 20.
• 22 zeigt eine schematische Querschnittsansicht gemäß 21.
• 23 zeigt ein schematisches Diagramm einer Halbschnittstruktur einer zweistufigen Brechungsschiebehülse gemäß 20.
• 24 zeigt eine schematische Querschnittsansicht gemäß 23.
• 25 zeigt eine schematische Strukturansicht eines Einwegeventils gemäß 21.
• 26 zeigt ein schematisches Diagramm des Zustands gemäß 25 im Säurebruchprozess.
• 27 zeigt ein schematisches Diagramm des Zustands gemäß 25 im Produktionsprozess.
• 28 zeigt eine schematische Strukturansicht eines adaptiven Durchflussregulierungs-, Wasserkontroll- und Versauerungsrohrstrangs eines anderen Ausführungsbeispiels der vorliegenden Anmeldung.
• 29 zeigt ein schematisches Diagramm einer Halbschnittstruktur einer Einströmung-Brechungsdurchgangskomponente gemäß 28.
• 30 zeigt eine schematische Querschnittsansicht gemäß 29.
• 31 zeigt eine schematische Querschnittsansicht eines Miniatur-Rückschlagventils gemäß 29.
• 32 zeigt eine schematische Querschnittsansicht einer Gummidichtungshülse gemäß 29.
• 33 zeigt eine schematische Querschnittsansicht einer adaptiven Durchflussregulierungs- und Wasserkontrollsiebröhre gemäß 28.

In order to explain the technical solution in the embodiments of the present invention or the prior art more clearly, the figures used in the explanation of the embodiment or the prior art are briefly introduced below. Obviously, the figures below only show some embodiments of the present invention. Those skilled in the art can obtain other figures based on the figures without having any creative work or doing creative work.

• 1 Fig. 12 shows a schematic structural view of a flow regulation and water control element of an embodiment of the present application.
• 2 shows a perspective view according to FIG 1 .
• 3 Fig. 12 shows a schematic structural view of a flow regulation and water control element of another embodiment of the present application.
• 4 shows a sectional view according to FIG 3 .
• 5 shows a perspective view according to FIG 3 .
• 6 Fig. 12 shows a schematic structural view of a flow regulation and water control element of another embodiment of the present application.
• 7 shows a perspective view according to FIG 6 .
• 8th Fig. 12 shows a schematic structural view of a flow regulation and water control element of another embodiment of the present application.
• 9 shows a perspective view according to FIG 8th .
• 10 Fig. 12 shows a schematic structural view of a flow regulation and water control element of another embodiment of the present application.
• 11 shows a perspective view according to FIG 10 .
• 12 Figure 12 is a schematic structural view of a channel switching tubing string for flow regulation, water control and segmented acidification of an embodiment of the present application.
• 13 FIG. 12 is a schematic diagram of a half-sectional structure of a one-way valve type water control screen tube according to FIG 12 .
• 14 shows a schematic cross-sectional view according to FIG 13 .
• 15 shows a schematic structural view of a screen part according to FIG 13 .
• 16 FIG. 12 shows a schematic diagram of a half-sectional structure of an inflow bullet-throwing refraction sliding sleeve according to FIG 12 .
• 17 shows a schematic cross-sectional view according to FIG 16 .
• 18 FIG. 12 shows a schematic diagram of the state of a flow regulation and water control part according to FIG 13 in the acid breaking process.
• 19 FIG. 12 shows a schematic diagram of the state of a flow regulation and water control part according to FIG 13 in the production process.
• 20 Fig. 12 is a schematic structural view of a one-way valve type flow regulation, water control and acidification piping of another embodiment of the present application.
• 21 Figure 12 shows a schematic diagram of a half-sectional structure of a water control screen tube of the type of one-way valve according to 20 .
• 22 shows a schematic cross-sectional view according to FIG 21 .
• 23 FIG. 12 shows a schematic diagram of a half-sectional structure of a two-stage refraction-push sleeve according to FIG 20 .
• 24 shows a schematic cross-sectional view according to FIG 23 .
• 25 FIG. 12 shows a schematic structural view of a one-way valve according to FIG 21 .
• 26 shows a schematic diagram of the state according to FIG 25 in the acid breaking process.
• 27 shows a schematic diagram of the state according to FIG 25 in the production process.
• 28 Figure 12 shows a schematic structural view of an adaptive flow regulation, water control and acidification tubing string of another embodiment of the present application.
• 29 FIG. 12 shows a schematic diagram of a half-sectional structure of an inflow fracture passage component according to FIG 28 .
• 30 shows a schematic cross-sectional view according to FIG 29 .
• 31 FIG. 12 shows a schematic cross-sectional view of a miniature check valve according to FIG 29 .
• 32 FIG. 12 shows a schematic cross-sectional view of a rubber grommet according to FIG 29 .
• 33 FIG. 12 shows a schematic cross-sectional view of an adaptive flow regulation and water control screen tube according to FIG 28 .

DETAILED DESCRIPTION

In connection with the figures in the embodiments of the present invention, the technical solution in the embodiments of the present invention is explained clearly and completely in the following, so that those skilled in this technical field can better understand the technical solution of the present invention. Obviously, the illustrated embodiments do not represent all embodiments but only part of the embodiments of the present invention. All other embodiments that should be obtained by those skilled in the art based on the embodiments in the present invention without creative works are considered to be within the scope of the present invention. It should be noted that when an element is depicted as being "arranged" on another element, the element may be directly on top of the other element or some other intervening element may exist. When an element is considered to be “connected” to another element, the element may be directly connected to the other element or another intervening element may co-exist. The technical terms used in the description such as "vertical", "horizontal", "left", "right" and similar formulations are only used to explain the goal; this is not a single embodiment.

Unless otherwise indicated, all technical and scientific terms used in the specification have the same meanings as commonly understood by those skilled in the art of the present invention. The terminology used in the description of the present invention is only for explaining the purpose of the detailed embodiments, rather than for limiting the present invention. The terms "and/or" as used in the specification include any and all combinations of one or more associated listed items. It should also be noted that in the absence of a clear definition, the undefined orientation words "above" and "below" in the present publication can be understood as the definition of the relationship or reference of the distance to the wellhead position, wherein among two components, the component with a small distance from the wellhead is above the component with a large distance from the wellhead, and different parts of the same component are also defined by the distance from the wellhead.

Like it in the 1 and 2 can be seen, an embodiment of the present publication provides a flow regulation and water control element, the flow regulation and water control element being an adaptive flow regulation and water control core control mechanism or adaptive inflow control device (AICD; adaptive inflow control device) for the three-phase or three-part Inflow of or from oil, gas and water is used. The embodiment provides a flow regulation and water control element (AICD) that is placed in the well and itself suitable for absorbing the inflowing liquid.

As a liquid inflow control mechanism, the flow regulation and water control element of an unwanted liquid (such as water in the oil and gas well) has a relatively large flow resistance and a relatively large pressure drop, and a desired liquid (such as oil and gas in the oil and gas well) a relatively large small flow resistance and a relatively small pressure drop. In this way, the inflow control mechanism can reduce the proportion of unwanted liquid in the produced liquid to maintain efficient production of the oil and gas well.

The flow regulation and water control element comprises a chamber 2, an outlet port 3 and at least one inlet port 1. The chamber 2 has a first end (upper end as viewed). 2 ; when installing on the flow regulation and water control strainer tube, the first end is a radially outer end in the radial direction of the base tube) and a second end (lower end in the facing direction). 2 ; when installed on the flow regulation and water control screen tube, the first and second ends respectively are radially inner ends in the radial direction of the base tube and the cross-section of the chamber decreases along the length of the chamber. The first end or portion of the chamber 2 is a cylindrical chamber and the second end or portion of the chamber 2 is a cylindrical chamber having an inner diameter smaller than that of the first end. In the flow regulation and water control element, the ratio between the diameter of the inlet opening 1, the diameter of the outlet opening 3 and the height of the flow channel is 1: 1.8-2.8: 4.5-6.5. The height of the flow channel is the vertical height from the upper part or uppermost part of the chamber 2 to the outlet opening 3 in the direction of view 2 and it can also be the distance in the vertical direction between the inlet port 1 and the outlet port 2 in the direction of view 2 be. The ratio between the inner diameter of the inlet opening 1 or the flow channel of the inlet opening 1 and the maximum inner diameter of the swirl chamber or swirl chamber 2 is 1:4.5-7.5. The flow regulation and water control member has a stepped shape wherein the outside diameter of a portion corresponding to the first end of the chamber is greater than the outside diameter of a portion corresponding to the second end of the chamber. In this way, positioning and installation in the connection hole of the base pipe are facilitated.

The outlet port 3 of the chamber is the second end of the chamber. The inlet port 1 has a horizontal dimension and is used to receive and convey the liquid into the first end or region of the chamber 1, the inlet port 1 being a linear flow channel and flowing along a direction substantially tangential to ( the first end) of the chamber 2 to create in the chamber 2 a liquid which rotates or which is swirled along the tangent plane of the chamber 2 to the outlet opening. At the same time, a variable oil-water friction structure (damping structure) can be added between the inlet port 1 and the first end of the chamber 2 to achieve the purpose of oil-gas-water separation.

The flow regulation and water control element has a more favorable pressure and flow rate behavior for the ideal liquid (oil, gas) to be produced. When the formation liquid or formed liquid flows into the device and is then throttled by the flow channel of the inlet port 1, the liquid forms a jet; where, when the inflowing liquid is oil, the jet formed has a lower velocity due to a lower density and higher viscosity than oil, so that the effect of increasing the rotation in the swirl chamber is limited. The jet quickly flows out of the central outlet port 3 and the throttling resistance generated throughout the device is relatively small. When water enters the water control device, the jet formed has a higher speed due to greater density, smaller viscosity and greater inertial force than water, so the effect of increasing the rotation in the vortex chamber is clear. As a result, a high-speed swirl flow is formed in the swirl chamber 2, and greater throttle resistance is generated. The flow regulation and water control element comprises a vortex generator at the inlet opening 1, which causes the liquid that has entered to generate the jets and these jets are directed into the chamber 2 of the flow regulation and water control element. In the chamber 2, the jet creates a rotating flow and an axial flow, and the axial flow is converted to the outlet port 3 of the chamber 2. In the rotation chamber 2, the gravitational potential energy of the liquid is converted into the kinetic potential energy for rotation towards the center and the kinetic potential energy of the tangential movement at the central outlet opening 3 becomes part of the overall flow regulation and water control element generated throttle resistance converted. Therefore, the entire water control device has a relatively large resistance to water. The oil has a relatively small throttling resistance in the throttling element due to its higher viscosity, while the viscosity and the inertial force of the gas are very small. Thus, the gas in the water control device also forms a very small flow resistance.

The flow regulation and water control element has an integral structure, which is made of materials suitable for the underground environment in the wells and has strong structural integrity, such as steel or tungsten carbide, and the flow regulation and water control element can be manufactured by processing, injection molding, Casting and other methods can be formed or manufactured. The overall size of the device is small and exquisite. The height is about 14-18mm, the diameter of the upper section is 18-20mm, the diameter of the lower section is 4-6mm, the diameter of the outlet port 3 is 1.6-4.5mm and the exterior of the lower one The end of the device has a thread design so that the device can be conveniently installed on the pipe string of the oil and gas well.

the 1 and 2 show respectively a transverse cross-section and a three-dimensional diagram of the vortex structure or vortex structure with double inlet openings 1. From the figures it can be seen that the structure comprises two liquid inlet openings 1 and these two inlet openings 1 each convey tangential jets into the vortex chamber or vortex chamber 2. Out of 2 it can be seen that the vortex chamber 2 is an inverted conical inner chamber 2, the inlet port 1 penetrates the wall of the chamber 2 and the second end of the chamber 2 is the liquid outlet port 3.

The turbulent flow or turbulent flow in the flow regulation and water control element forms a negative pressure area in the axis-near eye area or in the axis-near area around the center of the axis. The higher viscosity oil rotates at a slower speed and a lower viscosity liquid (like gas or water) rotates at a much higher speed. The lower pressure at the eye or at the center of the axis effectively restricts fluid flow. Therefore, the flow regulation and water control element is primarily responsive to fluid viscosity. The induced rotational flow results in a pressure drop, and the degree of the pressure drop is a function of the properties of the flowing liquid. The intensity of the flow reduction increases with the decrease in liquid viscosity and the maximum value is reached in the pure gas flow.

Like it in the 3 and 4 1, another embodiment of the present disclosure further provides a flow regulation and water control element. Compared to the flow regulation and water control element according to the 1 and 2 a long and short flow passage structure is added in this embodiment. The show 3 and 4 12 show the front view and the cross-sectional view of the long and short flow channel structure, respectively. The flow regulation and water control element comprises four cylindrical inlet flow channels of different lengths (the inlet flow channels comprise short flow channels 4 and long flow channels 5). The short flow channel 4 and the long flow channel 5 converge to reach the inlet end 6 of the swirl chamber after a reduction in diameter. The inlet end 6 is connected between the short flow channel 4 , the long flow channel 5 and the chamber 7 . The flow area of the inlet end 6 is smaller than the sum of the flow areas of the short flow channel 4 and the long flow channel 5. The ratio between the diameter of the long flow channel 5 and the diameter of the short flow channel 4 is 1:1-1.4.

The ratio between the length of the long flow channel 5 and the length of the short flow channel 4 is 3-5.5:1.

The second end of the vortex chamber or vortex chamber 7 (when installing on the flow regulation and water control screen tube, the second end is the radially inner end, which end can be inserted into the stepped through hole of the base tube wall for positioning and installation) is the liquid outlet port 8. The Swirl chamber 7 is an inverted conical inner chamber which is connected to the inner chamber structure of the double intake port swirl structure in FIGS 1 and 2 matches. 5 Figure 13 is a three-dimensional diagram of the long and short flow channel structure.

With the long and short flow channel 4 and 5, two intake flow channels are added on the basis of maintaining the swirl structure or swirl structure with double intake ports to effectively increase the oil passage area and reduce the resistance of the Device to reduce oil. At the same time, with the design of the long and short flow passages, the formation of the turbulence area is reduced. At the same time, multiple local throttling mechanisms are added to the entire set of the structure, so that the resistance to water is greatly increased and the water control function is further enhanced. By reducing the diameter of the inlet end 6, the flow velocity can be effectively increased so that the liquid more easily forms the jets flowing along the tangential plane of the vortex chamber. The resistance of the structure to water is further improved and the water-oil flow pressure ratio is further increased.

In order to increase the targeted property of oil, gas and water control, an adaptive flow regulation and water control element for oil, gas and water with a multi-branch flow channel structure is established by adding branch flow channels. Like it in the 6 and 7 1, an embodiment of the present disclosure further provides an adaptive oil, gas and water flow regulation and water control element having a multi-branch flow channel structure. the 6 and 7 12 are a top perspective view and a longitudinal perspective view of the multi-branched flow channel structure, respectively. 7 Figure 12 shows a three-dimensional diagram of the multi-branched flow channel structure.

The flow regulation and water control element comprises two rectangular inlet flow channels 9. The cross-sectional area of the rectangular inlet flow channel 9 is a rectangular structure. In the flow passage 9, a plurality of branch flow passages 10 and two guide passages 11 which guide the liquid to swirl in the swirl chamber are arranged to extend inward. like it in 7 As shown, the height of the flow channel gradually decreases from the inlet flow channel 9 to the guide channel 11 . A certain gradient is shown. The lower end of the flow regulation and water control element is the liquid outlet opening 13.

Specifically, the ratio between the diameter of the intake flow passage is 9 (the width of the flow passage in the state according to 6 ) and the diameter of the outlet opening 13 1: 1.8-2.5.

The ratio between the diameter of the inlet flow channel 9 (the width of the flow channel in the state according to 6 ) and the diameter of the branch flow channel or branch flow channel 10 is 1-1.2: 1. The ratio between the inlet height of the inlet flow channel 9 and the outlet height of the inlet flow channel 9 is 3: 2. The outlet opening of the inlet flow channel 9 is the inlet opening of the guide channel 11 The flow channel width of the intake flow channel 9 in the state of FIG 6 is unchanged and the flow channel width of the guide channel 11 in the state of FIG 6 gradually decreases along the flow direction.

Based on the flow regulation and water control mechanism with the double intake port vortex flow in the multi-branched guide structure, an oil-water separating mechanism and a variable oil-water friction structure are added in the intake flow passage 9 to achieve the goal of controlling the water and better achieve stabilization of the oil. By means of the local friction effect or sticking effect, the branch flow channel 10 achieves the function of passing the oil and blocking the water, and by means of the local friction effect or sticking effect along the path, the guide channel 11 achieves the function of letting the oil pass and blocking the water. Simultaneously with the height difference between the inlet opening and the outlet opening of the flow channel, the water can more easily form the jet flowing along the tangential plane of the swirl chamber. This structure encourages the liquid to be relatively low-density during the swirling process and first allows the higher-density oil to flow rapidly to the liquid outlet port 13 while the higher-density water rotates along the swirl chamber, thereby controlling water and stabilizing oil. In addition, the presence of the branch flow passage 10 further encourages the oil flowing out of the branch flow passage 10 to flow straight toward the central outlet port, while the water flowing out of the guide passage approximately enters the swirl chamber with a rotation method to thereby provide high throttling resistance to form the center of the vortex chamber.

In order to further improve the comprehensive control capabilities of the adaptive flow regulation and water control element for water control, oil stabilization and gas production, in the three types of conical vortex chambers or vortex chambers (the chamber(s) of the flow regulation and water control element according to 1 until 7 may be referred to as vortex chamber(s) movable small balls are arranged and the movable small balls in the vortex chamber(s) are made of different materials according to the specific density requirements. When the density of the incoming liquid is less than the density of the small spheres, the centrifugal force on the liquid is less than the centrifugal force on the small spheres, and the small spheres correspond to a greater buoyancy force. Therefore, the small balls rotate around or in the vortex chamber (namely to an end at a greater distance from the liquid outlet opening). Conversely, if the density of the incoming liquid is greater than the density of the small spheres, the small spheres will move to the liquid outlet port. The mechanism can use this effect to selectively create or restrict the liquid flow of different densities, such as in gas extraction and water control, and oil extraction and water control.

Three types of three-phase or three-part adaptive flow regulation and water control mechanism for oil, gas and water, which is essentially conical, are shown above. The conical flow regulation and water control element has the advantages that it is easy to install, that the vortex chamber has a relatively large flow area, and that the oil-water resistance changes can be increased by conical vortices.

Given the limitation of its own volume, the passage area and rotating vortex of a single conical choke are relatively small. In order to facilitate field use, the present publication further discloses two embodiments of the flat adaptive flow regulation and water control element based on the conical flow regulation and water control element. The flow regulation and water control element serves as a water control and throttling element to regulate formation fluid.

the 8th and 9 show a schematic structural view of a flat flow regulation and water control element. the 8th and 9 Figure 12 shows a top perspective view and a three-dimensional perspective diagram, respectively, of a flat flow regulation and water control element with dual inlet ports. The flow regulation and water control element comprises two funnel-shaped inlet flow channels 14, two narrow liquid acceleration channels 15, a liquid swirl disk 16 and a central outlet port 11. As shown in FIG 9 As shown, the fluid acceleration channel 15 and the swirl disk 16 are in a tangential state. After the formation fluid enters the flow regulation and water control element, it enters the flow regulation and water control element from the inlet flow channel 14 . Then it is caught and accelerated by the liquid acceleration passages 15 . It then enters or flows onto the central vortex disk 16 . The ratio between the diameter of the central vortex disk 16 and the diameter of the central outlet opening is (8.5-12): 1. Due to the low viscosity and high density of the water, it enters or exits the vortex disk 16 in a tangential direction flows onto it and forms a high-velocity vortex in the vortex disk 16 . According to the law of conservation of angular momentum, the water in the vortex disk 16 rotates at high speed to create a high additional drag, thereby increasing the additional pressure created by the entire choke element; and due to the high viscosity and relatively low density of the oil, it is difficult for the oil to rotate and flow like water at high speed in the vortex disk 16 and even more quickly flow out the center outlet port. The rotation and fluid control of the central vortex disc 21 of the entire set or sets of the throttle mechanism is of great importance. The ratio between the diameter of the vortex disk 16 and the height of the entire flow regulation and water control element is 10-12:1, and the ratio between the length, the width and the height of the acceleration channel 15 of the flow channel is 9-11:1-1, 5 : 1.2-1.8.

the 10 and 11 show a schematic structural view of another flat flow regulation and water control element. the 10 and 11 Figure 12 shows a top perspective view and a three-dimensional perspective diagram, respectively, of the structure of a flat multi-branched flow regulation and water control member. The flow regulation and water control element comprises two funnel-shaped inlet flow channels 18, eight branch channels 19, two gradually narrowing guide channels 20, a liquid vortex disk or Flüs fluid swirl disk 21 and a central outlet port 22.

like it in 11 As shown, the 8 branch flow channels or branch flow channels 19 are formed by the end face protrusion, the protruding structure (the end face protrusion) is oriented vertically to the guide channel 20 at the same position and the end angle of the protruding structure in the incoming direction or inflow direction is an acute one angle is. With the structure, a vortex is formed in the branch flow channel when the inflowing liquid is water with large inertial force to prevent water from flowing into the branch flow channel or to block entry of water. In this way it is ensured that the water flowing into the throttling element essentially all (but at least part) enters the guide channel 20, and the guide channel 20 is a channel which gradually narrows from the inlet end to the outlet end. In particular, the ratio of the width of the inlet end of the guide channel 20 to the width of the outlet end is 3:2 enters or flows onto the vortex disk 20 from the tangent, and the ratio between the diameter of the central vortex disk 21 and the diameter of the central outlet orifice is (6.5-10.5):1. Due to the low viscosity and high density of the water enters the vortex disk 21 in a tangential direction and forms a high-speed vortex in the vortex disk 21 . According to the law of conservation of angular momentum, the water in the vortex disk 21 rotates at high speed to form a high additional drag, thereby increasing the additional pressure created by the entire choke element; and due to the high viscosity and relatively low density of the oil, the oil entered the flat multi-branched leading flow regulation and water control member flows through the branch flow channel directly to the central outlet port. The additional resistance generated in the throttle element is relatively small. The ratio between the diameter of the vortex disk 21 and the height of the entire throttling mechanism (flow regulation and water control element) is 8.5-10.5 : 1, and the ratio between the length, the width and the height of the acceleration channel of the flow channel is 9- 11:1-1.5:1.2-1.8.

Like it in the 12 until 19 As can be seen, an embodiment of the present disclosure provides a flow regulation, water control and acidification device, in particular a flow regulation, water control and acidification complete device for oil and gas wells. The flow regulation, water control and acidification complete device for oil and gas wells comprises a flow regulation and water control screen tube 52 and an inflow mechanism 53 connected to the flow regulation and water control screen tube 52.

The screen tube has a base tube 522 , a screen part 524 arranged on the base tube 522 and a flow regulation and water control part 520 connected to the screen part 524 . Screen 524 is used to filter formation fluid. The flow regulation and water control portion 520 is connected to the underflow of the screen portion 524 to increase the resistance to flow of water in the formation fluid. In the inflow mechanism 53, a center channel connected to the base pipe 522 and an acidification hole for connecting the center channel to the outside of the inflow mechanism 53 are arranged. The inflow mechanism 53 is configured to manipulably open and close the acidification hole by pushing from outside the well. The inflow device only allows the liquid to flow from the central channel through the acidification hole to the outside of the inflow mechanism 53 . The inflow mechanism 53 may be installed at both the upper end of the flow regulation and water control screen tube 52 and the lower end of the flow regulation and water control screen tube 52, which is not limited by the present application.

In order to mate with the inflow mechanism 53 and to ensure that the acidification liquid enters the layer to be acidified as much as possible through the acidification hole in the event of an acid break, a one-way component is also arranged on the base pipe 522 . The flow direction allowed by the one-way component is opposite to the flow direction of the inflow mechanism 53. The one-way component is configured to allow the liquid to flow from the screen part 524 to the flow regulation and water control part 520 and prevents the liquid from flowing from the flow regulation - and water control part 520 flows to the screen part 524. Along the direction of flow of the formation fluid or formed fluid is the Disposable component upstream of flow regulation and water control element 534.

like it in 15 1, the screen part 524 in the present embodiment comprises an outer protective cover 20, a filter net 21, a flow guide net 22, a filter net 23, a flow guide net 24 and a backing layer 25, which are fitted sequentially from the outside to the inside . On the outer protective cover 20 circular through holes are distributed. The filter net 21, the flow guide net 22, the filter net 23 and the flow guide net 24 form a filter layer. The flow guide nets 22, 24 are used to guide the flow of the liquid. The filter nets 21, 23, the flow guide nets 22, 24 and the backing layer 25 are integrally fixed by forging.

The flow regulation and water control part 520 includes an outer tube 528 fixed to the outside of the base tube 522 and a flow regulation and water control element 534 installed in the outer tube 528 on the wall of the base tube 522 . The flow regulation and water control member 534 accommodates a plate-shaped flow regulation and water control member in the above embodiment or a conical flow regulation and water control member. A flow regulation and water control space is formed between the base tube 522 and the outer tube 528 . The flow regulation and water control element 534 connects the interior of the base tube 522 to the flow regulation and water control space. The formation fluid enters the flow regulation and water control space and is restricted by the flow regulation and water control element 534 . After that, oil and gas are pumped into the base pipe 522 .

In the present embodiment, the flow regulation, water control, and acidification complete equipment for oil and gas wells is a flow regulation, water control, and segmented acidification tubing string 50 that can divide the formation into multiple acidification layers (formations), with a separate one for each acidification layer (formation). Acid Break production operation can be performed. The flow regulation and water control screen tube 52 and inflow mechanism 53 form a flow regulation, water control and acidification component. The flow regulation, water control, and segmented acidification tubing string 50 includes an upper packer 51, a plurality of flow regulation, water control, and acidification components, an isolation packer (or isolation packing) 54 connected to two adjacent flow regulation, water control, and acidification components. a wellbore shut-off valve 55; and dual stage floats 56. FIG.

In one embodiment, the flow modulation, water control, and acidification complete device for oil and gas wells is a channel switching tubing string 50 for flow modulation, water control, and segmented acidification. Here, the channel-switching flow regulation, water control, and segmented acidification tubing string 50 comprises an upper packer 51, a plurality of flow regulation, water control, and acidification components, an isolation packer (or isolation packing) connected to two adjacent flow regulation, water control, and acidification components. 54, a wellbore shut-off valve 55, and two-stage floats 56.

In particular, the channel switching tubing string 50 for flow regulation, water control, and segmented acidification includes an upper packer 51, an influent water control screen 52, an influent shot-fracture slip sleeve 53, an isolation packer, an influent end water control screen tube 52, an inflow shot-fracture slip sleeve 53, a wellbore shut-off valve 55, and two-stage floats 56. The dual stage floats 56 include a forward dual stage float 56 and a reverse dual stage float 56. The channel switching tubing string 50 for flow regulation, water control and segmented acidification isolates an upper from a lower acidification layer and carries out the acidification and production process accordingly.

As in 13 and 14 As illustrated, the flow regulation and water control screen 52 is an incoming water control screen. The inflow mechanism 53 is an inflow shotgun refraction sliding sleeve. The flow regulation, water control and acidification device is a channel switching tubing string 50 for flow regulation, water control and segmented acidification. The inflow water control screen tube 52 and inflow bullet refraction slide sleeve 53 form the flow regulation, water control and acidification components.

In the present embodiment, the incoming water control screen tube 52 is formed by a screen part 524 and a flow regulation and water control part 520, with the (adaptive) flow regulation and water control element 534 (AICD) installed on the screen base pipe 522. At the upper end of the base tube 522, a connecting hoop 521 is fixedly connected.

A guide channel is formed between the sieve part 524 and the base tube 522 . like it in 15 As shown, the screen part 524 is mainly composed of a three-layer structure and the outermost side is an outer protective cover 20 of the round hole. The outer protective cover 20 protects the filter layer and ensures the strength and reliability of the screen. The middle second through fifth layers are the filter layers. Among the filter layers, the second and fourth layers are the precision filter nets 21, 23 (sand protection filter effect). The third and fifth layers are precision flow guiding meshes 22, 24 (guiding and directing the incoming liquid respectively). The sixth layer on the inside is the support layer 25 to ensure sufficient flow area between the filter layer and the base tube 522. The three are forged through the forging process, which increases the strength over the traditional screen tube while reducing the cost by 74%.

An upper end ring 523 is firmly connected to the upper end of the outer protective sleeve 20 and is firmly attached outside of the base tube 522 . The lower end of the outer protective sheath 20 and the upper end of the outer tube 528 are connected to each other by a coupling plug 525 . The coupling plug 525 is fitted tightly outside the base pipe 522, and between the coupling plug and the base pipe 522, a channel for connecting the flow regulation and water control space and the screen part 524 (the guide channel) is formed.

The lower end of the outer tube 528 is fitted outside the lower joint 530 and fixed by a set screw 531 to perform anti-rotation adjustment.

Like it in the 18 and 19 shown, the disposable component of the incoming water control screen tube 52 includes a flow sleeve 527 fixedly mounted inside the outer tube 528, a locking piston 526, and a first support spring 538. There is a retaining ring 529 between the outer tube 528 and the upper end of the lower connector 530 firmly connected. The retaining ring 529 is firmly attached to the rear end of the outer space 5272 . The rear end of the first support spring 538 abuts the retaining ring and the front end abuts the locking piston 526 . The first support spring 538 is a cylindrical spring 538 fitted outside the flow sleeve 527 . The flow-through sleeve 527 divides the flow-regulating and water-control space in the radial direction into an inner space 5271 and an outer space 5272 connected to the sieve part 524. The flow-regulating and water-control element 534 connects the inner space 5271 to the inside of the base tube 522. On the flow-through sleeve 527 is a Connection hole 5270 for connecting the inner space 5271 and the outer space 5272 is provided.

A sealing washer 532 is disposed on the outer wall of the lower port 530 and seals abuttingly between the lower end of the outer tube 528 and the lower port 530 to block the lower end of the outer space 5272 . The upper and lower ends of the flow sleeve 527 are respectively sealed to the upper locating ring (the upper locating ring is fitted tightly outside of the base tube 522) and the exterior of the upper end of the lower connector 530, with between the upper end of the flow sleeve 527 and the upper Fixing ring and between the lower end of the flow sleeve 527 and the upper end of the lower connector 530 is also a sealing ring 533 is arranged. Seal washers 535, 537 are disposed on the inner wall and the outer wall of the lock piston 526, respectively, to block the communication hole 5270 at the initial position.

The outer space 5272 and the inner space 5271 are the annular spaces separated from each other by the flow sleeve 527 . The locking piston 526 and the first support spring 538 are arranged in the outer space 5272 . The lockup piston 526 slides in the outer space 5272 along the axial direction.

The lock piston 526 has a lock position for locking the communication hole 5270 and an open position for the communication hole 5270 to be open. The first support spring 538 supports the lock piston 526 at the lock position in the axial direction. The lock-up piston 526 can be pushed by the formation fluid or formed liquid so that it moves from the locked position ( 18 ) for open position ( 19 ) emotional.

The disposable component of the incoming water control screen tube 52 includes a piston 526, a first support spring 538 and a passage flux sleeve 527. As it is in 18 As shown, in the acid fracturing process, under normal circumstances, the piston 526 blocks the flow hole 5270 of the flow sleeve 527 and the acidifying fluid cannot enter the formation through the screen tube 52 . like it in 19 As shown, in the production process, the oil and gas will push the piston 526 to compress the spring 538, opening the connection hole 5270 of the flow sleeve 527, and the oil and gas of the formation will enter the oil line through the water control and gas stabilization device at the end and reach the ground.

It can be seen that when acidifying through the influent water control screen in the present embodiment, the piston 526 blocks the connection hole of the flowthrough sleeve 527 and the acidifying fluid cannot enter the formation through the influent water control screen. In the production process, the liquid pushes the piston 526 to compress the spring 538, opening the channel, and the liquid at the end enters the oil line through the water control device and reaches the bottom.

like it in 16 and 17 1, in the present embodiment, the inflow mechanism 53 is an inflow shot-fracture sliding sleeve. The inflow bullet refraction slide sleeve 53 is connected to the lower end of the flow regulation and water control screen tube 52 . The inflow bullet refraction sliding sleeve 53 comprises an outer sleeve 542 and an inner sliding sleeve 545 slidably fitted inside the outer sleeve 542. Inside the inner sliding sleeve 545 a central channel is formed and a ball seat 546 is fixed. Arranged between the inner sliding sleeve 545 and the outer sleeve 542 are a slide 543 firmly connected to the outside of the inner sliding sleeve 545 and a second support spring 544 supporting the slide 543 axially. The slider 543 is firmly connected to the outer sleeve 542 via a shear pin 554 . The acidification hole 540 is provided on the outer sleeve 542 . The inner slip sleeve 545 is secured in a position to block the acidification well 540 via the shear pin 554 . An upper port 541 is connected to the upper end of the outer sleeve 542 and a lower port 547 is connected to the lower end of the outer sleeve 542, and these are sealed by an abutting sealing washer 548. The position where the inner sliding sleeve 545 blocks the acidification hole 540 (the position according to 16 and 17 ) is such that the upper end of the inner sliding sleeve 545 is sealed in the upper connection 541 and the lower end of the inner sliding sleeve 545 is placed or inserted in the lower connection 547 in a sealed manner.

The lower end of the upper terminal 541 is fixed to the inside of the upper end of the outer sleeve 542 . On the inner wall of the lower end of the upper terminal 541, a restricting step is arranged. When the inner sliding sleeve 545 is at the home position, the upper end of the inner sliding sleeve 545 is restricted by the restricting step of the upper terminal 541 and the upper end abuts the inner wall of the lower end of the upper terminal 541 in a sealed manner. The outer wall of the inner sliding sleeve 545 has a bearing step, with the slide 543 being fastened between the inner sliding sleeve 545 and the outer sleeve 542, and with sealing washers 552, 554 being arranged on the inside and outside of the slide 543, which are attached to the walls of the inner sliding sleeve 545 and the outer sleeve 542 are sealed adjacent. The slider 540 mates with the deck and is pushed up by the second support spring 544 so that the slider abuts the deck. The slide 543 thus forms an axial joint movement with the inner sliding sleeve 545 . The ball seat 546 is fixed to the inner wall of the inner sliding sleeve 545 by the set screw 551 . The inner wall of the upper end of the lower terminal 547 has a sliding portion for sliding the inner sliding sleeve 545, and a washer 549 and a locking step are arranged on the inner wall. The inner slide sleeve 545 is pushed and slid down until it comes into contact with the lock stage and cannot go any further in, and the acidification hole 540 is opened. A sealing washer 549 is arranged on the inner wall of the upper end of the lower terminal 547 and is in sealing contact with the inner sliding sleeve 545 . A sealing disk 550 is arranged between the ball seat 546 and the inner sliding sleeve 545 in order to realize the seal. When the ball seat 546 is locked by the ball throw and by pushing the pressure in the central channel exceeds a certain pressure value, the ball seat 546 drives the inner sliding sleeve 545 and the slide 543 to shear the shear pin 554 and move to the acidification hole 540 to open, and when the pushing stops, the second support spring 544 pushes the inner sliding sleeve 545 to block the acidification hole 540 again.

The inflow bullet throwing refraction sliding sleeve 53 seals the steel body through the ball and ball seat 546, and presses and pushes the slider 543 of the inner sliding sleeve 545 to shear the shear pin 554 to open the inner sliding sleeve 545 and open the Ver to realize acid hole 540. After stopping the pressing from outside the well, the inner sliding sleeve 545 is returned under the action of the second support spring 544 to close the acidification hole 540 .

• Als Erstes Verwenden einer Bohrstange, um das spezielle Hineinfahrwerkzeug anzuschließen, Hineinfahren des obigen Rohrstrangs 50 in die vorbestimmte Position, Durchführen eines automatischen Verpressens während des Hineinfahrvorgangs durch das Brunnenbohrloch-Absperrventil 55 und Eintreten bzw. Einströmen der Flüssigkeit durch das Loch des Brunnenbohrloch-Absperrventils 55 in das Innere des Rohrstrangs 50, um den Innen- und Außendruck des Rohrstrangs 50 im Gleichgewicht zu halten; Werfen der Kugel und Schließen des Brunnenbohrloch-Absperrventils 55 nach dem Hineinfahren bis zur richtigen Position; wobei zu diesem Zeitpunkt der vorwärtsbewegbare bzw. vorwärtsgehende zweistufige Schwimmer bzw. Schwimmschuh 56 geöffnet werden kann, während der rückwärtsbewegbare bzw. rückwärtsgehende zweistufige Schwimmer bzw. Schwimmschuh 56 gesperrt ist.

Nach dem Schließen des Brunnenbohrloch-Absperrventils 55 wird der Isolationspacker 54 schrittweise eingestellt. Die Ölleitung steht unter Druckeinstellung. Nach der Einstellung wird die Abdichtung des Isolationspackers 54 geprüft. Durch die Ringraumdruckprüfung wird die Abdichtung des Isolationspackers 54 geprüft. Wenn der Druck stabil ist, ist die Abdichtung qualifiziert.
Dann wird der obere Suspensionspacker bzw. die obere Einstellungspackung durch ein spezielles Einstellwerkzeug eingestellt. Nach der Einstellung werden die Abdichtung und die Aufhängung durch den Ringraum geprüft. Die Hülse wird gedrückt, um zu prüfen, ob der obere Packer 51 qualifiziert ist. Nachdem die Prüfung der Abdichtung des oberen Packers 51 qualifiziert ist, wird das Auslöse-Einstellwerkzeug durch die Ringform gedrückt oder vorwärts gedreht bzw. bewegt.
Beim Versauern der unteren Schicht (Versauerungsschicht) werden säurebeständige lösliche Kugeln geeigneter Größe auf den Kugelsitz 546 der Einströmung-Kugelwurf-Brechung-Schiebehülse 53 der unteren Schicht geworfen. Die Ölleitung wird gedrückt. Der Kugelsitz 546 wird über den Scherstift 554 von der Innengleithülse 545 und dem Schieber 543 abgeschoren. Dann wird die Innengleithülse 545 geöffnet und wird das Versauerungsloch 540 geöffnet, und die Versauerung der ersten Schicht wird gestartet. Jetzt wird der mit der Außenseite verbundene Strömungskanal der Einströmendes-Wasser-Kontrollsiebröhre durch den Kolben verstopft und kann die Versauerungsflüssigkeit nur durch das Versauerungsloch 540 der Einströmung-Kugelwurf-Brechung-Schiebehülse 53 in die Formation eintreten, um die Versauerung zu vervollständigen und die Formation auszubaggern bzw. auszugraben. Nach der Versauerung wird das Drücken gestoppt. Die zweite Stützfeder 544 liegt an dem Schieber 543 an. Der Schieber 543 schiebt die Innengleithülse 545 und den Kugelsitz 546 zur Rückstellung. Unter Wirkung der zweiten Stützfeder 544 schließt der Kugelsitz 546 erneut die Schiebehülse.
Wenn die Versauerung beendet ist, wird das Drücken beendet. Die zweite Stützfeder 544 drückt gegen den Schieber 543 und der Schieber 543 drückt die innere Schiebehülse 545 und den Kugelsitz 546 zurück, und der Kugelsitz 546 schließt die Schiebehülse wieder unter der Wirkung von der zweiten Stützfeder 544.When using the channel switching tubing string 50 for flow regulation, water control and segmented acidification, the following operational methods are used for implementation:

• First, using a drill rod to connect the special running-in tool, running in the above pipe string 50 to the predetermined position, performing automatic jacking during the running-in operation through the wellbore shut-off valve 55, and entering the liquid through the hole of the wellbore shut-off valve 55 into the interior of the tubing string 50 to balance the internal and external pressures of the tubing string 50; throwing the ball and closing the wellbore shut-off valve 55 after running in to the correct position; at which time the forward two-stage float 56 can be opened while the rearward two-stage float 56 is locked.

After the wellbore shut-off valve 55 is closed, the isolation packer 54 is gradually adjusted. The oil line is pressurized. After the adjustment, the sealing of the insulation packer 54 is checked. The sealing of the insulation packer 54 is checked by the annulus pressure test. When the pressure is stable, the sealing is qualified.
Then the upper suspension packer or the upper adjustment packing is adjusted by a special adjustment tool. After adjustment, the seal and the suspension through the annulus are checked. The sleeve is pushed to check if the top packer 51 is qualified. After the upper packer 51 seal test is qualified, the trip setting tool is pushed or rotated forward through the annulus.
When acidifying the lower layer (acidifying layer), acid-resistant soluble balls of appropriate size are thrown onto the ball seat 546 of the inflow shot-throwing refraction sliding sleeve 53 of the lower layer. The oil pipe is pressed. The ball seat 546 is sheared off the inner sliding sleeve 545 and the slide 543 by the shear pin 554. Then, the inner sliding sleeve 545 is opened and the acidification hole 540 is opened, and the acidification of the first layer is started. Now, the flow channel of the inflow water control screen tube connected to the outside is clogged by the piston, and the acidification liquid can only enter the formation through the acidification hole 540 of the inflow bullet throw fracture sliding sleeve 53 to complete the acidification and dredge the formation or dig up. After acidification, the pressing is stopped. The second support spring 544 rests against the slide 543 . The slider 543 pushes the inner sliding sleeve 545 and the ball seat 546 to reset. Under the action of the second support spring 544, the ball seat 546 closes the sliding sleeve again.
When the acidification is over, the pressing stops. The second support spring 544 pushes against the slide 543 and the slide 543 pushes back the inner sliding sleeve 545 and the ball seat 546, and the ball seat 546 closes the sliding sleeve again under the action of the second support spring 544.

The channel-switching tubing string 50 for flow regulation, water control, and segmented acidification can increase the number of acidification layers by adding the isolation packer 54, the influent water control screen tube, and the ball throw fracture sliding sleeve 53 with a ball seat 546 of different sizes to achieve precision layering to realize. In production, the oil and gas are filtered forward through the screen section of the incoming water control screen tube and enter the annulus to base pipe 522 . Then they push the piston away, flow through the flow regulation and water control element 534 (AICD) through the connection hole of the flow sleeve, enter the oil pipe, and at the end reach the bottom to realize production with the water control and gas stabilization.

1. 1. Realisieren einer geschichteten Versauerungsfunktion, die in 3 oder mehr Schichten unterteilt werden kann, wobei der Versauerungseffekt besser ist;
2. 2. Realisieren einer geschichteten Durchflussregulierungs- und Wasserkontrollfunktion, die in 3 oder mehr Schichten unterteilt werden kann, wobei die Durchflussregulierung und die Wasserkontrolle gezielt gute Eigenschaften und Effekte haben;
3. 3. Der Versauerungskanal und der Wasserkontrollkanal sind vollständig getrennt, wobei die segmentierte Versauerung eine große Verdrängung und eine bessere Effizienz hat, wobei bei der Wasserkontrolle die Flüssigkeit durch die Siebröhre ins Durchflussregulierungs- und Wasserkontrollgerät eintritt, wobei dabei die Wasserkontrolle gezielt gut ist;
4. 4. Realisieren mehrschichtiger Säurebruch- und Wasserkontrollvorgänge durch eine Fahrt des Rohrstrangs 50, um die Bauzeit zu verkürzen und die Betriebseffizienz zu verbessern;
5. 5. Realisieren der Integration von segmentierter Versauerung, Durchflussregulierung und Wasserkontrolle.

The channel switching tubing string 50 for flow regulation, water control and segmented acidification in the present embodiment has the following advantages:

1. 1. Realizing a stratified acidification function, which can be divided into 3 or more layers, with the acidification effect being better;
2. 2. Realizing a layered flow regulation and water control function, which can be divided into 3 or more layers, with the flow regulation and water control purposefully having good properties and effects;
3. 3. The acidification channel and the water control channel are completely separated, with the segmented acidification has a large displacement and better efficiency, with water control, the liquid enters the flow regulation and water control device through the sieve tube, and the water control is purposefully good;
4. 4. Realizing multi-layered acid fracture and water control operations by one run of the tubing string 50 to shorten construction time and improve operational efficiency;
5. 5. Realize the integration of segmented acidification, flow regulation and water control.

Like it in the 20 until 27 As can be seen, in another embodiment of the present disclosure, the flow regulation, water control, and acidification device is a flow regulation, water control, and acidification tubing string 60 of the one-way valve type 25. The flow regulation and water control screen tube 62 is a water control screen tube 62 of the one-way valve type. The inflow mechanism is a two-stage rupture slide sleeve 63 connected to the lower end of the one-way valve type water control screen tube 62.

The one-way valve type water control screen tube 62 and the two-stage breaking sliding sleeve 63 constitute a flow regulation, water control and acidification component. The one-way valve type flow regulation, water control and acidification tubing string 60 comprises an upper packer 61, a plurality of flow regulation, water control and acidification components, an isolation packer (or insulation packing) connected to two adjacent flow regulation, water control and acidification components ) 64, a wellbore shut-off valve 65, and two-stage floats 66.

like it in 20 As shown, the entire set or assembly of flow regulation, water control and acid rupture columns 60 of the one-way valve type, for example divided into an upper and lower acidification layer, is primarily an outer tubing string, which consists of the following tools. The outer tubing string 60 includes, from top to bottom, an upper packer 61, a one-way valve type water control screen 62, a two stage fracturing sleeve 63, an isolation packer 64, an incoming water control screen 62, a two stage fracturing sleeve 63, a wellbore shut-off valve 65 and two-stage floats 66.

In the present embodiment, the one-way valve 62 type water control strainer tube 62 is formed by a strainer part 624 and a flow regulation and water control part 620, with the (adaptive) flow regulation and water control element 631 (AICD) installed on the strainer base pipe 622. At the upper end of the base tube 622, a connecting hoop 621 is fixedly connected.

like it in 15 1, the screen part 624 is mainly composed of a three-layer structure, and the outermost side is an outer protective cover 20 of the round hole. The outer protective cover 20 protects the filter layer and ensures the strength and reliability of the screen. The middle second through fifth layers are the filter layers. Among the filter layers, the second and fourth layers are the precision filter nets 21, 23 (sand protection filter effect). The third and fifth layers are precision flow guiding meshes 22, 24 (guiding and directing the incoming liquid respectively). The sixth layer on the inside is the support layer 25 to ensure sufficient flow area between the filter layer and the base tube 622. The three are forged through the forging process, which increases the strength over the traditional screen tube while reducing the cost by 74%.

Like it in the 21 and 22 is shown, an upper end ring 623 is fixedly connected to the upper end of the outer protective sleeve 20 and is firmly fitted outside of the base tube 622 . The lower end of the outer protective sheath 20 and the upper end of the outer tube 626 are connected to each other by a coupling plug 625 . A guide channel is formed between the sieve part 624 and the base tube 622 . The coupling plug 625 is fitted tightly outside the base pipe 622, and between the coupling plug and the base pipe 622, a channel for connecting the flow regulation and water control space and the screen part 624 (the guide channel) is formed. The lower end of the outer tube 626 is fitted outside the lower joint 632 and fixed by a set screw 634 to perform anti-rotation adjustment. The lower end of outer tube 626 is further sealed to lower port 632 by sealing washer 635 .

The base tube 622 includes an upper base tube 6220 and a lower base tube 628. The lower end of the upper base tube 6220 and the upper end of the lower base tube 628 are connected by a middle connection firmly connected to each other. The screen member 624 is disposed outside of the upper base tube 6220 with the flow regulation and water control member 620 disposed at least in large part on the lower base tube 628 . The disposable component 630 is fitted between and surrounding the outer tube 626 and the base (lower) tube 622 to divide the flow regulation and water control space along the axial direction into a first axial space connected to the screen part 624 and a first axial space connected to the flow regulation and To divide water control element 631 associated second axial space that are spaced apart. The lower end of the lower base pipe 628 is externally threaded to the inside of the lower joint 632 and provided with a washer 633 for sealing. The lower base pipe 628 forms an installation base of the flow regulation and water control member 631. The flow regulation and water control member 631 is a plate-shaped flow regulation and water control member as in the above embodiment or a conical flow regulation and water control member.

Like it in the 25 , 26 and 27 As shown, the one-way component 630 includes a first one-way ball seat 6301 and a second one-way ball seat 6302 coupled along the axial direction. A sealing disk 629 is arranged on the (radial) inside and outside of the first one-way ball seat 6301 and the second one-way ball seat 6302 , which forms a seal with the outer wall of the lower base tube 628 and the inner wall of the outer tube 626 . Along the direction of flow of the formation fluid, the first one-way ball seat 6301 is located upstream of the second one-way ball seat 6302, the first one-way ball seat 6301 having first channels 6311 distributed in the circumferential direction in a first number. The second one-way ball seat 6302 has second passages 6321 distributed in the circumferential direction in a number greater than the first number.

In particular, the second ducts 6321 in the first number and the first ducts 6311 in the first number are sequentially aligned in the axial direction, with the second ducts 6321 in the remaining number being offset from the first ducts 6311 . Of the first passages 6311 and second passages 6321 aligned one after the other along the axial direction, a ball seat 6312, 6322 is respectively arranged at the opposite snapped end portions of the first passages 6311 and the second passages 6321, wherein in the opposite snapped ball seats 6312, 6322 a check valve ball 636 is arranged. The number of second channels 6321 can be twice the number of first channels 6311 . The first one-way ball seat 6301 and the second one-way ball seat 6302 are coupled with each other, whereby a coupling gap can exist between the two and wherein the axial length of the coupling gap is smaller than the diameter of the check valve ball 636, preferably smaller than the radius of the check valve ball 636.

The check valve ball 636 is a steel ball that can move along the axial direction. Of the aligned first passages 6311 and second passages 6321, the two ball seats 6312, 6322 form a movement space of the check valve ball 636. The check valve ball 636 moves forward to block the first passage 6311. At this time, the first one-way ball seat 6301 is completely locked and the one-way component 630 is closed. The shutoff valve ball 636 moves backward to shut off part (the first number) of the second passages 6321, and the second passages 6321 in the remaining number are not shut off. The disposable component 630 is thereby opened.

During acidification, the one-way valve (one-way component 630) is closed and the acidification fluid cannot enter the formation through the screen tube and can only enter the formation through the two-stage fracturing-sliding sleeve 63. During production, the one-way valve 630 is opened. The liquid passes from the filter mesh through the one-way valve (the one-way component 630). At the end it enters the oil line through the flow regulation and water control element 631 (AICD) and reaches the bottom. The one-way component 630 of the one-way valve structure is a left and right ball seat 6312, 6322 with different number of holes, and the check valve ball 636 cannot leave the left and right ball seat 6312, 6322. As shown in the acid rupture diagram in 26 As shown, the balls 636 fall fully into the left ball seat 6312 in the acid fracturing process. At this point, the flow channel is completely blocked by the balls 636 to realize that the acidifying fluid cannot enter the formation. As shown in the production diagram in 27 As shown, the check valve balls 636 fall fully into the right ball seat 6322 in the production process. However, the number of right hand holes is greater than the number of balls 636. The flow channel is opened and the oil and gas of the formation pass through the flow control and Water control element 631 (water control and gas stabilization element) into the oil line and reach the bottom.

As in the 23 and 24 shown, the two-stage refraction sliding sleeve 63 in the present exemplary embodiment comprises a sliding sleeve body 651, an upper valve seat sliding sleeve 652 which is slidably fitted or inserted in the sliding sleeve body 651, and a lower valve seat sliding sleeve 653 located below the upper valve seat sliding sleeve 652. On the sliding sleeve body 651 the acidification hole 6510 is planned. The inner diameter of the lower valve seat sliding sleeve 653 is smaller than the inner diameter of the upper valve seat sliding sleeve 652. Accordingly, the diameter of the upper valve ball 659 is larger than the diameter of the lower valve ball 653, with the lower valve ball 653 through the upper valve seat sliding sleeve 652 of the lower valve seat sliding sleeve 653 to lock the lower valve seat sliding sleeve 653. The lower valve ball 653 is thrown down to open the acidification hole 6510. Thus, it can be referred to as an acid rupture ball. The upper valve ball 659 is thrown down to close the acidification hole 6510. Thus, it can be referred to as a closing ball. The lower valve seat slide sleeve 653 is positioned via a shear pin 654 in a position to block the acidification hole 6510 . Upper valve seat slide sleeve 652 is positioned above lower valve seat slide sleeve 653 via shear pin 6511 . The lower valve seat sliding sleeve 653 can be pushed into the position for opening the acidification hole 6510 by compressive force after it has been blocked by throwing a ball. The upper valve seat sliding sleeve 652 can be pushed to the position for blocking the acidification hole 6510 again by the compressive force after being blocked by ball throwing. A sealing washer is arranged at the upper and lower ends of the upper valve seat sliding sleeve 652, which comes into sealing contact with the inner wall of the sliding sleeve body 651, and a sealing washer 655 is arranged at the upper and lower ends of the lower valve seat sliding sleeve 653 which comes into sealing contact with the inner wall of the sliding sleeve body 651 .

Through the two-stage upper and lower valve seat sliding sleeve 653 with different radii, the two-stage refraction sliding sleeve 63 controls the opening and closing of the acidification hole 6510. The lower valve seat sliding sleeve 653 is opened. Then the lower valve seat sliding sleeve 653 moves down and the acid break hole is opened. The upper valve seat sliding sleeve 652 is opened. Then the upper valve seat slide sleeve 652 moves down and the acid rupture hole is again closed. For example, the outside diameter of the lower valve ball 653 (the ball is acid resistant and soluble) is 0.1 in (2.54 mm), which is smaller than the minimum inside diameter of the upper valve seat slide sleeve 652 to allow passage through the upper valve seat slide sleeve 652 to facilitate.

A lower terminal 657 is connected to the lower end of the sliding sleeve body 651 . A sealing disk 656 is arranged between the lower end of the sliding sleeve body 651 and the lower connection 657 . A portion of the lower terminal 657 protruding inside the lower end of the sliding sleeve body 651 has a limiting end 6571 . The lower valve seat sliding sleeve 653, when pushed by the shot to contact the restricting end 6571, is restricted by the lower port 657 in the axial direction. The upper valve seat sliding sleeve 652, when pushed by the ball throw to touch the lower valve seat sliding sleeve 653, is limited by the lower valve seat sliding sleeve 653 in the axial direction and blocks the acidification hole 6510 again.

• Als Erstes Verwenden einer Bohrstange, um das spezielle Hineinfahrwerkzeug anzuschließen, Hineinfahren des obigen Rohrstrangs 60 in die vorbestimmte Position, Durchführen eines automatischen Verpressens während des Hineinfahrvorgangs durch das Brunnenbohrloch-Absperrventil 65, und Eintreten bzw. Einströmen der Flüssigkeit durch das Loch des Brunnenbohrloch-Absperrventils 65 in das Innere des Rohrstrangs 60, um den Innen- und Außendruck des Rohrstrangs 60 im Gleichgewicht zu halten; Werfen der Kugel und Schließen des Brunnenbohrloch-Absperrventils 65 nach dem Hineinfahren bis zur richtigen Position; wobei zu diesem Zeitpunkt der vorwärtsbewegbare bzw. vorwärtsgehende zweistufige Schwimmer bzw. Schwimmschuh 66 geöffnet werden kann, während der rückwärtsbewegbare bzw. rückwärtsgehende zweistufige Schwimmer bzw. Schwimmschuh 66 gesperrt ist.

Nach dem Schließen des Brunnenbohrloch-Absperrventils 65 wird der Isolationspacker 64 schrittweise eingestellt. Die Ölleitung steht unter Druckeinstellung. Nach der Einstellung wird die Abdichtung des Isolationspackers 64 geprüft. Die Ringraumdruckprüfung wird durchgeführt. Wenn der Druck stabil ist, ist die Abdichtung qualifiziert. Dann wird der obere Suspensionspacker bzw. die obere Einstellungspackung durch ein spezielles Einstellwerkzeug eingestellt. Nach der Einstellung werden die Abdichtung und die Aufhängung durch den Ringraum geprüft. Die Hülse wird gedrückt, um zu prüfen, ob der obere Packer 61 qualifiziert ist. Nachdem die Prüfung der Abdichtung des oberen Packers 61 qualifiziert ist, wird das Auslöse-Einstellwerkzeug durch den Ringform gedrückt oder vorwärts gedreht bzw. bewegt.
Beim Versauern der unteren Schicht (Versauerungsschicht) werden säurebeständige lösliche Kugeln auf die untere Ventilsitz-Schiebehülse 653 des zweistufigen Brechungsventilsitzes der unteren Schicht geworfen. Die Ölleitung wird gedrückt. Die untere Ventilsitz-Schiebehülse 653 schert den Scherstift ab. Die untere Ventilsitz-Schiebehülse 653 bewegt sich nach unten. Dann wird das Versauerungsloch 6510 geöffnet und wird die Versauerung der ersten Schicht (der unteren Versauerungsschicht) gestartet. Jetzt wird der mit der Außenseite verbundene Strömungskanal der Wasserkontrollsiebröhre 62 vom Typ des Einwegeventils geschlossen und kann die Versauerungsflüssigkeit nur durch das Versauerungsloch 6510 der zweistufige Brechungsschiebehülse 63 in die Formation eintreten, um die Versauerung zu vervollständigen und die Formation auszubaggern bzw. auszugraben. Nach der Versauerung wird das Drücken gestoppt. Säurebeständige lösliche Kugeln geeigneter Größe werden auf die obere Ventilsitz-Schiebehülse 652 des zweistufigen Brechungsventilsitzes der unteren Schicht geworfen. Die obere Ventilsitz-Schiebehülse 652 schert den Scherstift ab. Die obere Ventilsitz-Schiebehülse 652 bewegt sich nach unten und wird am oberen Ende der unteren Ventilsitz-Schiebehülse 653 positioniert. Zu diesem Zeitpunkt schließt die obere Ventilsitz-Schiebehülse 652 gerade das Versauerungsloch 6510.
Wenn die obere Schicht (die Versauerungsschicht) zu versauert ist, ist der Vorgang völlig gleich wie der Versauerungsvorgang der unteren Schicht. Der Durchflussregulierungs-, Wasserkontroll- und Versauerungsrohrstrang 60 vom Typ des Einwegeventils kann durch Hinzufügen des Isolationspackers 64, der Wasserkontrollsiebröhre vom Typ des Einwegeventils und der zweistufigen Brechungsschiebehülse 63 mit einem Kugelsitz verschiedener Größe die Anzahl von Versauerungsschichten erhöhen, um eine Präzisionsschichtung zu realisieren. Im Produktionsvorgang werden das Öl und das Gas durch den Siebabschnitt der Wasserkontrollsiebröhre 62 vom Typ des Einwegeventils vorwärts gefiltert und treten in den Ringraum zu dem Basisrohr ein. Dann strömen sie über das Einwegeventil durch das Wasserkontrollgerät (AICD), treten in die Ölleitung ein und erreichen am Ende den Boden, um eine Produktion mit der Wasserkontrolle und der Gasstabilisierung zu realisieren.When using the one-way valve type flow regulation, water control and acidification piping string 60, the following operational methods are used for implementation:

• First, using a drill rod to connect the special running-in tool, running in the above tubing string 60 to the predetermined position, performing automatic swaging during the running-in operation through the wellbore shut-off valve 65, and entering the liquid through the hole of the wellbore shut-off valve 65 into the interior of the tubing string 60 to balance the internal and external pressures of the tubing string 60; throwing the ball and closing the wellbore shut-off valve 65 after running in to the correct position; at which time the forward two-stage float 66 can be opened while the rearward two-stage float 66 is locked.

After the wellbore shut-off valve 65 is closed, the isolation packer 64 is gradually adjusted. The oil line is pressurized. After the adjustment, the sealing of the insulation packer 64 is checked. The annulus pressure test is carried out. When the pressure is stable, the sealing is qualified. Then the upper suspension packer or the upper setting pack set using a special adjustment tool. After adjustment, the seal and the suspension through the annulus are checked. The sleeve is pushed to check if the upper packer 61 is qualified. After the upper packer 61 seal test is qualified, the trip setting tool is pushed or rotated forward through the annulus.
When acidifying the lower layer (acidifying layer), acid-resistant soluble balls are thrown onto the lower valve seat sliding sleeve 653 of the two-stage lower layer rupture valve seat. The oil pipe is pressed. The lower valve seat slide sleeve 653 shears off the shear pin. The lower valve seat sliding sleeve 653 moves down. Then, the acidification hole 6510 is opened and the acidification of the first layer (the lower acidification layer) is started. Now the flow channel of the one-way valve type water control screen tube 62 connected to the outside is closed and the acidification liquid can only enter the formation through the acidification hole 6510 of the two-stage fracturing-sliding sleeve 63 to complete the acidification and dredge the formation. After acidification, the pressing is stopped. Appropriately sized acid resistant soluble balls are thrown onto the upper valve seat push sleeve 652 of the lower layer two-stage rupture valve seat. The upper valve seat slide sleeve 652 shears off the shear pin. The upper valve seat slide sleeve 652 moves down and is positioned at the top of the lower valve seat slide sleeve 653 . At this point, the upper valve seat sliding sleeve 652 is just closing the acidification hole 6510.
If the upper layer (the acidification layer) is too acidified, the process is exactly the same as the acidification process of the lower layer. The one-way valve type flow regulation, water control and acidification piping string 60 can increase the number of acidification layers by adding the isolation packer 64, the one-way valve type water control screen tube and the two-stage fracture sliding sleeve 63 with a ball seat of different sizes to realize precision layering. In the production process, the oil and gas are filtered forward through the screen section of the one-way valve type water control screen tube 62 and enter the annulus to the base pipe. Then they flow through the water control device (AICD) through the one-way valve, enter the oil pipeline and reach the bottom at the end to realize production with the water control and gas stabilization.

1. 1. Realisieren einer geschichteten Versauerungsfunktion, die in 3 oder mehr Schichten unterteilt werden kann, wobei der Versauerungseffekt besser ist;
2. 2. Realisieren mehrschichtiger Vorgänge durch eine Fahrt, um die Bauzeit zu verkürzen und die Betriebseffizienz zu verbessern;
3. 3. Realisieren der Integration von Versauerung und Wasserkontrolle;
4. 4. Das Werkzeug nimmt die mechanische Struktur vollständig an und seine Leistung ist zuverlässig;
5. 5. Die Erhöhung der Anzahl der Bruchabschnitte in einem Abschnitt wird realisiert, wobei dadurch die gezielte Eigenschaft des Säurebruchs innerhalb des Abschnitts verbessert wird;
6. 6. Realisieren des Öffnens und Schließens der Wasserkontrollsiebröhre 62 unter Verwendung des Einwegeventils, wobei dadurch eine bessere Zuverlässigkeit erzielt wird.

The one-way valve type flow regulation, water control and acidification piping 60 in the present embodiment has the following advantages:

1. 1. Realizing a stratified acidification function, which can be divided into 3 or more layers, with the acidification effect being better;
2. 2. Realizing multi-layer operations by one ride to shorten construction time and improve operation efficiency;
3. 3. Realize the integration of acidification and water control;
4. 4. The tool fully adopts the mechanical structure, and its performance is reliable;
5. 5. The increase in the number of fracture sections in one section is realized, thereby improving the targeted property of acid fracture within the section;
6. 6. Realizing the opening and closing of the water control screen tube 62 using the one-way valve, thereby achieving better reliability.

Like it in the 28 until 33 As can be seen, in another embodiment of the present disclosure, the flow regulation, water control, and acidification device is an adaptive flow regulation, water control, and acidification tubing string 70. The flow regulation and water control screen 73 is an adaptive flow regulation and water control screen 73. The inflow mechanism 74 is an inflow disruption passage component 74 connected to the top of the flow regulation and water control screen 73. The inflow disruption passage component 74 and the adaptive flow regulation and water control screen 73 form the flow regulation, water control and acidification component.

The adaptive flow regulation, water control, and acidification tubing string 70 includes an upper packer 71 and a plurality of flow regulation, water control, and acidification components; an expansion packer 72 being positioned above and below each of the flow regulation, water control and acidification components. The adaptive flow regulation and water control screen tube 73 is further provided with a centralizer 75 .

The one-piece adaptive flow regulation and water control screen tube 73 consists primarily of one screen part 733 and an adaptive flow regulation and water control part, wherein the adaptive flow regulation and water control element 737 is installed on the base pipe of the adaptive flow regulation and water control part. A connecting hoop 731 is firmly attached to the upper end of the base tube.

The adaptive flow regulation and water control screen tube 73 includes a screen base pipe 732 and a water control base pipe 736. The screen base pipe 732 and the water control base pipe 736 are joined together to form the base pipe. A guide channel 734 is formed between the sieve part 733 and the base tube 732 . A connection component 735 is fixedly connected to the outside of the base pipe. The connection component 735 is firmly connected to the lower end of the outer protective sheath 20 and the upper end of the outer tube 738 . A connection channel for connecting the guide channel 734 and the flow regulation and water control space is provided on the connection component 735 .

like it in 15 1, the screen part 733 is mainly composed of a three-layer structure, and the outermost side is an outer protective cover 20 of the round hole. The outer protective cover 20 protects the filter layer and ensures the strength and reliability of the screen. The middle second through fifth layers are the filter layers. Among the filter layers, the second and fourth layers are the precision filter nets 21, 23 (sand protection filter effect). The third and fifth layers are precision flow guiding meshes 22, 24 (guiding and directing the incoming liquid respectively). The sixth layer on the inside is the support layer 25 to ensure sufficient flow area between the filter layer and the base pipe. The three are forged through the forging process, which increases the strength over the traditional screen tube while reducing the cost by 74%.

The water control base pipe 737 is connected to the inner wall of the outer pipe 738 at two axial ends of the flow regulation and water control space, respectively. The water control base pipe 736 is further provided with a pinch wall channel at the head of the flow regulation and water control space. A connection annulus is also provided between the upper end of the water control base tube 736 and the connection component. The connection annulus connects between the connection channel and the clamping wall channel. A flow regulation and water control space is formed between the recessed portion located between the top and bottom of the water control base tube 736 and the outer tube 738 . The flow regulation and water control member 737 is installed on the wall of the depressed portion. At the lower end of the water control base pipe 736, a lower connector 739 is also arranged. The flow regulation and water control part is mainly composed of three parts, which are respectively the water control base tube 736, the outer tube 738, and the flow regulation and water control element 737 as an adaptive flow regulation core element. The flow regulation and water control element 737 is welded or threaded to the top of the central hole of the water control base tube 736, while the adaptive flow regulation and water control element 737 is connected to the special water control base tube 736 through the threaded bayonet connection and to the one with the flow regulation and Water control room connected central hole of the water control base pipe 736 is installed to ensure the connection flexibility of the tool.

Like it in the 29 and 30 As shown, the inflow fracturing passage component 74 in the present embodiment includes: an outer cylinder body 756 and an inner pipe body 752 fixedly fitted in the outer cylinder body 756. On the outer cylinder body 756, the acidification hole and a miniature check valve 755 arranged in the acidification hole are arranged. The interior of the inner tube body 752 forms a central channel. The central channel has a drain opening 7521 . The drain port 7521 communicates with the middle annular space between the inner tubular body 752 and the outer cylindrical body 756 . Also disposed in the central annular space is a rubber grommet 758 which fits snugly against the exterior of the inner tube body 752 and covers the drain opening 7521 . The rubber grommet 758 can open the drain port 7521 when the pressure in the central channel exceeds a first preset pressure. The upper end of the outer cylinder body 756 is connected to the lower end of the upper fitting 751 by a male thread and sealed by the sealing washer 754 . The upper end of the inner pipe body 752 is fixed inside the upper joint 751 and sealed by the sealing washer 753 . Similarly, the lower end of the outer cylinder body 756 is fitted outside the upper end of the lower port 762 and sealed by the sealing washer 760 . The lower end of the inner cylinder body 752 is fitted in the upper end of the lower port 762 tightly or inserted and sealed by the sealing washer 761.

like it in 31 shown, the miniature check valve 755 comprises a valve body 7551 fixed in the acidification hole, a blocking plate 7552 fixed to the radially outer end of the valve body 7551, a valve ball 7555 located in the valve body 7551 and a spring 7553 located between the valve ball 7555 and the blocking plate 7552 The radially inner end of valve body 7551 has a valve body seat blocked by valve ball 7555 . A guide body 7554 is also arranged in the valve body 7551 . The guide body 7554 abuts against the inner wall of the valve body 7551 to guide the movement of the valve ball 7555 and to serve as a support point of the spring 7553 . This will make it easier to install the 7553 spring. The spring 7553 is installed between the guide body 7554 and the locking plate 7552. The valve ball 7555 sits between the valve body seat and the guide body 7554 and is pushed by the spring 7553 or pressed.

Specifically, the miniature check valve is constituted by the check plate 7552, the spring 7553, the guide body 7554, the valve body seat and the steel ball 7555. Here, the overall structure is relatively simple, and the exterior of the entire valve body 7551 is threaded. Thereby, it can be installed to the outermost outer cylinder body of the inflow breaking passage component 74 through the thread connection, and the overall structure is small and flexible, and has good reliability. The miniature check valve is in a closed depressing state during the mold retraction process, and the opening pressure is set at 0.1-0.2MPa. During acidification, the acidifying and fracturing fluid is injected into the formation. When the injection pressure is greater than 0.2MPa, the check valve can be fully opened (acidification hole). The minimum passage diameter of the whole check valve is 5mm, and under the driving pressure of 1MPa, then a single miniature check valve can pass more than 0.5m ³ fracturing liquid per minute, which meets the technical requirements of large-scale acidification and fracturing.

During production, the pressure of formation acts on the miniature check valve 755. Due to the face seal between the steel ball 7555 and the valve body seat, the miniature check valve 755 can block the pressure difference of 60MPa and ensure that the miniature check valve 755 is closed or is. In this manner, the fluid must first experience flow regulation and fluid control through the one-piece adaptive flow regulation and water control screen tube 73 and then enter the production tubing string 70 . The whole miniature check valve adopts one-piece design or one-piece design without any moving parts, so the use has good reliability, which can meet the application needs.

Like it in the 31 , 32 As shown, the inflow break passage component 74 performs sealing of the double steel body through the miniature check valve 755 and the rubber grommet 758 . In the acidification process, the pressure in the pipe is applied to push the rubber grommet 758 to expand outward and open, and the miniature check valve 755 is further pushed to open. Thereby, the opening of the entire inflow fracturing passage component 74 is realized and the acidification channel is opened to realize the communication between the inside and outside of the tubing string 70 . After the squeezing stops, the miniature check valve 755 is reset under the action of the spring 7553. The rubber grommet 758 is restored to close the drain port again. In the inflow breaking passage component 74 , the function of opening, closing and sealing is mainly realized by the miniature check valve 755 and the rubber grommet 758 .

In order to install the rubber grommet 758, a fixing sleeve 757 is further fixed outside of the inner tube body 752. The upper end of the fixing sleeve 757 is screwed to the outside of the inner tube body 752 . A sealing disk 759 is arranged at the lower end of the fastening sleeve 757 and is fitted in abutting manner on the outer wall of the inner tubular body 752 . The space between the upper and lower ends of the fixing sleeve 757 and the outer wall of the inner pipe body 752 together form a space for accommodating the rubber grommet sleeve 758 . The mounting sleeve 757 is provided with a mounting stair step at the upper end of the space to be fitted into the upper end 7581 of the rubber grommet sleeve 758 . In this way, the rubber sealing sleeve is axially limited. The fixing sleeve 757 is further provided with a communication through hole 7571 on the outer wall of the space connecting the space with the outer ring space (the annular space between the outer cylinder body and the inner tubular body) connects.

The wall thickness of the rubber grommet 758 is a stepped wall thickness along the axial direction from the upper end to the lower end. The upper stepped wall thickness is greater than the lower stepped wall thickness. like it in 32 As shown, the rubber grommet 758 has the thickness of the upper end greater than the thickness of the middle portion 7582 and the thickness of the lower end 7583, with the thickness of the lower end 7583 being the smallest. The rubber grommet 758 has an annular seal structure, and the thickness of the rubber is arranged in a cascade structure. This structure is mainly suitable that when injecting the acidifying liquid into the inside, the opening method of the rubber seal is such that it is gradually opened from the outside inward, to ensure that the rubber seal component is opened smoothly in the acid injection process . In the production process, the rubber grommet 758 receives a forward sealing pressure. With the formation pressure, it is ensured that the rubber sealing sleeve 758 is tightly fitted to the wall surface of the inner pipe body, to avoid leakage during gas production due to lack of sealing, which affects the effect of the work or operation of the flow regulation and water control device.

During acidification, the inflow fracturing passage component 74 is the main flow conduit and most of the acidifying and fracturing fluid flows through the inflow fracturing passage component 74 to the exterior of the tubing string 70 and enters the formation, and only a small amount of acidifying fluid passes through the adaptive flow regulation and water control screen tube 73 into the formation. In the production process, the liquid pushes the inflow break passage component 74 to close. The formation fluid or formed fluid must be adjusted by the adaptive flow regulation and water control device. Then she enters the oil line and reaches the bottom.

In using the adaptive flow regulation, water control and acidification tubing string 70, the following operational methods are used for implementation: First, use a drill rod to connect the special running tool. Running in the above tubing string 70 to the predetermined position.
Since the interior and exterior of the adaptive flow regulation and water control screen 73 are connected during the running-in process, the liquid can enter the interior of the tubing string 70 through the adaptive flow regulation and water control screen 73 . No additional tools or special operations are required to keep the balance between the inside and outside of the pipe. After the tool reaches the correct position, the upper suspension packer or adjustment upper packing is adjusted by a special adjustment tool. After adjustment, the seal and the suspension through the annulus are checked. The sleeve is pushed to check if the upper packer 71 is qualified. After the upper packer 71 seal test is qualified, the trip setting tool is pushed or rotated forward through the annulus. Segmented acidification: The oil line is pushed. The acidification and fracturing fluid is pumped in. With the increase in pressure of the inner tubing string 70, the inflow fracturing passage component 74 is opened and the acidifying and fracturing fluid respectively passes through the inflow fracturing passage components 74 located at the front, middle and rear of the entire set(s). assembly of the adaptive flow regulation and water control completion tubing 70, into the formation to implement the segmented acidification of the respective reservoir. Now the inside and outside of the adaptive flow regulation and water control screen tube 73 are connected, however, the permeability of the inflow breaking passage component 74 is much better than that of the adaptive flow regulation and water control screen tube 73, and during the breaking process displacement there is high displacement. The pressure in the pipe is relatively high. Therefore, the acidifying and fracturing fluid enters the formation largely through the inflow fracturing passage component 74 to effect the segmented acidification and fracturing of the reservoirs and to dredge the formation. After the completion of the acidification, the pressing is stopped. Under the action of formation pressure, the inflow fracturing passageway slip sleeve is again closed. The adaptive flow regulation, water control and acidification tubing string 70 can increase and optimize the number and position of the acidification layers by increasing the number and location of the oil expansion packer 72, the adaptive flow regulation and water control screen tubing, and the inflow fracturing passage component 74. to realize a precision layering ate.
In the production process, the oil and gas are filtered forward through the screen section of the adaptive flow regulation and water control screen 73 and enter the annulus to the base pipe. They enter the oil pipeline through the flow regulation and water control element 737 (AICD) of the adaptive flow regulation and water control complete device, and reach the bottom at the end to realize production with the water control and gas stabilization.

1. 1. Mit einem einteiligen Design bzw. mit einer einteiligen Gestaltung hat der adaptive Durchflussregulierungs- und Wasserkontrollkomplettierrohrstrang 70 eine einfache Struktur und eine gute Zuverlässigkeit;
2. 2. Die adaptive Durchflussregulierungs- und Wasserkontrollsiebröhre 73 hat eine einfache Konstruktionsstruktur ohne bewegliche Elemente. Somit weist sie eine lange Lebensdauer auf;
3. 3. Mittels eines Expansionspackers bzw. einer Expansionspackung 72 wird ein Segmentieren der Lagerstätten realisiert. Dabei werden die Einstellungs- und Prüfungsvorgänge des Packers nicht benötigt, was die Sicherheit des gesamten Prozesses und die Einfachheit der Konstruktion erhöht;
4. 4. Das Innere und das Äußere der adaptiven Durchflussregulierungs- und Wasserkontrollsiebröhre 73 sind miteinander verbunden. Während des Hineinfahrprozesses sind der innere und äußere Druck des Rohrstrangs 70 ausgeglichen, was die Sicherheit verbessert;
5. 5. Die Einströmung-Brechungsdurchgangskomponente 74 hat eine einfache Struktur und die Öffnungs- und Schließvorgänge sind einfach und zuverlässig;
6. 6. Realisieren einer geschichteten Versauerungsfunktion, die in 3 oder mehr Schichten unterteilt werden kann, wobei der Versauerungseffekt besser ist;
7. 7. Der Versauerungskanal und der Wasserkontrollkanal sind vollständig getrennt. Die segmentierte Versauerung hat eine große Verdrängung und eine bessere Effizienz. Bei der Wasserkontrolle tritt die Flüssigkeit durch die Siebröhre ins Durchflussregulierungs- und Wasserkontrollgerät ein. Dabei ist die Wasserkontrolle gezielt gut;
8. 8. Realisieren mehrschichtiger Säurebruch- und Wasserkontrollvorgänge durch eine Fahrt des Rohrstrangs 70, um die Bauzeit zu verkürzen und die Betriebseffizienz zu verbessern;
9. 9. Realisieren der Integration von segmentierter Versauerung, Durchflussregulierung und Wasserkontrolle.

Zusammenfassend gesagt, wird bei einem Durchflussregulierungs-, Wasserkontroll- und Versauerungskomplettiergerät für Öl- und Gasbrunnen und einem zugehörigen Rohrstrang 70 das System des einteiligen Rohrstrangs 70 zur segmentierten Versauerung, Produktion und Wasserkontrolle durch einen Arbeitsgang hineingefahren. Danach wird durch die Expansionsdichtung des Isolationspackers die Segmentierung des horizontalen Brunnenabschnitts realisiert, um die Segmentierung der Lagerstätten und den Säurebruch verschiedener Abschnitte zu realisieren und die Funktion des segmentierten Säurebruchs zu erzielen. Nach dem Abschluss des Säurebruchs sind die jeweiligen horizontalen Abschnitte mit den Lagerstätten verbunden und die Flüssigkeit außerhalb der Lagerstätten kann entsprechend der unterschiedlichen verwendeten Prozesstechnologie durch die (adaptive) Durchflussregulierungs- und Wasserkontrollsiebröhre 73 unterschiedlicher Arten in den Produktionsrohrstrang 70 eintreten. Wenn sie durch die Einströmendes-Wasser-Kontrollsiebröhre 73 oder die Wasserkontrollsiebröhre 73 vom Typ des Einwegeventils oder die adaptive Wasserkontrollsiebröhre 73 geht, üben die Wirbelströmungskanalstruktur bzw. Verwirbelungsströmungskanalstruktur und die flache Strömungskanalstruktur der Innenwandoberfläche des Durchflussregulierungs- und Wasserkontrollelements 737 zweimal den Widerstand auf die zufließende bzw. einströmende Flüssigkeit aus, um die Zuflussgeschwindigkeit der Flüssigkeit verschiedener Phasen bzw. Bestandteile zu steuern. Auf die Weise wird das Ziel einer ungehinderten Ausgabe von Gas, einer vorrangigen Ausgabe der Ölphase bzw. des Ölbestandteils und einer kontrollierten Ausgabe der Wasserphase bzw. des Wasserbestandteils erreicht, um den Zweck der Durchflussregulierung und Wasserkontrolle zu erreichen und die Schwierigkeiten mit dem einteiligen Werkzeuggerät und der zugehörigen Technologie zu segmentiertem Säurebruch, Produktion und Wasserkontrolle für wasserführende Öl- und Gasbrunnen, dichte Öl- und Gaslagerstätten und komplexe und säurereiche Öl- und Gaslagerstätten zu lösen.The adaptive flow regulation, water control and acidification tubing string 70 in the present embodiment has the following advantages:

1. 1. With a one-piece design, the adaptive flow regulation and water control completion tubing 70 has a simple structure and good reliability;
2. 2. The adaptive flow regulation and water control screen tube 73 has a simple construction structure with no moving elements. Thus, it has a long service life;
3. 3. The deposits are segmented by means of an expansion packer or expansion packing 72 . It does not require the adjustment and testing operations of the packer, which increases the safety of the whole process and the simplicity of the construction;
4. 4. The interior and exterior of the adaptive flow regulation and water control screen tube 73 are connected. During the running-in process, the internal and external pressures of the tubing string 70 are balanced, which improves safety;
5. 5. The inflow breaking passage component 74 has a simple structure, and the opening and closing operations are simple and reliable;
6. 6. Realizing a stratified acidification function, which can be divided into 3 or more layers, with the acidification effect being better;
7. 7. The acidification channel and the water control channel are completely separated. Segmented acidification has large displacement and better efficiency. In water control, the liquid enters the flow regulation and water control device through the sieve tube. The water control is purposefully good;
8. 8. Realize multi-layered acid fracture and water control operations by one run of tubing string 70 to reduce construction time and improve operational efficiency;
9. 9. Realize the integration of segmented acidification, flow regulation and water control.

In summary, with an oil and gas well flow regulation, water control, and acidification complete assembly and associated tubing string 70, the system of one-piece segmented acidification, production, and water control tubing string 70 is run in by one operation. After that, through the expansion seal of the insulation packer, the segmentation of the horizontal well section is realized to realize the segmentation of the deposits and the acid fracture of different sections, and achieve the function of the segmented acid fracture. After the completion of the acid fracture, the respective horizontal sections are connected to the reservoirs and the liquid outside the reservoirs can enter the production tubing string 70 through the (adaptive) flow regulation and water control screen pipe 73 of different types according to the different process technology used. When it passes through the inflowing water control screen tube 73 or the one-way valve type water control screen tube 73 or the adaptive water control screen tube 73, the swirling flow channel structure and the flat flow channel structure of the inner wall surface of the flow regulating and water control member 737 apply twice the resistance to the inflowing water Incoming liquid to control the inflow rate of the liquid of different phases or components. In this way, the goal of unhindered gas discharge, priority discharge of oil phase or oil component, and controlled discharge of water phase or water component is achieved to achieve the purpose of flow regulation and water control and solve the difficulties with the one-piece tool device and related segmented acid fracture technology, production and water control for water bearing oil and gas wells, dense oil and gas reservoirs and complex and acidic oil and gas reservoirs.

Through one operation, the system of tooling device and pipe string 70 with one-piece functions of segmented acid fracture and completion and production and water control is retracted to solve the problems that the yield increasing effect of the general acid fracture of long horizontal well drilling However, it is not apparent that after a period of segmented acid fracture production, gas production from various horizontal sections becomes unbalanced and marginal and bottom water readily infiltrates and floods the wellbore.

The pipe string is inserted in one operation. At the same time, the production function of the original pipe string 70 can be realized after the acid break, and there is an effect of water control and prevention of blocking due to edge and bottom water along the horizontal well borehole to reduce the operations, save process costs, the production of to prevent toxic gases and complex working conditions to the highest degree during the completion of complex oil and gas wells, to ensure the safety of production processes, the effect of maximum production in the controlled area of water, oil and gas deposits with different borders or environments and soils, as well complex and difficult oil and gas deposits and to complete and optimize the production of oil and gas wells.

Each numerical value given here includes all values from the lower and upper values, which increase gradually in increments of one unit from the lower limit to the upper limit, as long as there is a gap of at least two units between each lower value and each higher value. For example, when it is stated that the number of a component or the value of a process variable (such as temperature, pressure, time, etc.) is 1 to 90, preferably 20 to 80 and more preferably 30 to 70, this is intended to illustrate that the description is also explicit lists values such as 15 to 85, 22 to 68, 43 to 51, and 30 to 32. For values less than 1, a unit is conveniently considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples to be clearly expressed and it can be assumed that all possible combinations of numerical values listed between the lowest value and the highest value are similarly clearly set out in this description. Unless otherwise noted, all ranges include endpoints and all numbers between endpoints. The use of "approximately" or "proximal" in a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to include "about 20 to about 30" including at least the specified endpoints.

All disclosed articles and references, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" describing the combination includes the particular element, ingredient, component, or step and other elements, parts, components, or steps that do not materially affect the basic novel properties of the combination. Use of the term "comprising" or "including" to describe a combination of elements, parts, components, or steps herein also encompasses an embodiment consisting essentially of those elements, parts, components, or steps. The term "may" is used herein to illustrate that each of the described attributes included in "may" are optional.

Multiple items, parts, components, or steps may be provided by a single integrated item, part, component, or step. Alternatively, a single integrated element, part, component, or step can be broken down into separate multiple elements, parts, components, or steps. The disclosure of "a" or "a piece" used to describe an item, trimmings, component, or step does not mean that other items, trimmings, components, or steps are excluded.

It should be understood that the above description is intended to be illustrative and not limiting. Many implementations and many applications beyond the examples provided will be apparent to those skilled in the art from reading the above description. Therefore, the scope of the present teaching should be determined not with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents of such claims. For purposes of disclosure, all articles and references, including patent applications and publications, are incorporated herein by reference. Omission of any aspect of the subject matter disclosed herein in the preceding claims does not mean abandonment of that subject matter, nor should it be assumed that the inventor did not consider that subject matter to be part of the disclosed subject matter of the invention.

Claims (18)

A flow regulation, water control and acidification complete set for oil and gas wells, comprising: a flow regulation and water control screen tube; the screen tube being a base tube, a a screen portion disposed on the base pipe and a flow regulation and water control portion connected to the screen portion; wherein the screen member is used to filter a formation fluid; and wherein the flow regulation and water control member is connected to the underflow of the screen member to increase the resistance to flow of water in the formation fluid; and an inflow mechanism connected to the flow regulation and water control screen tube; wherein in the inflow mechanism there are arranged a central passage connected to the base pipe and an acidification hole for connecting the central passage to the outside of the inflow mechanism; and wherein the inflow mechanism is configured to manipulably open and close the acidification hole by pushing from outside the well. Flow regulation, water control and acidification complete device for oil and gas wells claim 1 wherein a disposable component is further disposed on the base tube; wherein the disposable component is configured to allow the liquid to flow from the strainer portion to the flow regulation and water control portion and to prevent the liquid from flowing from the flow regulation and water control portion to the strainer portion. Flow regulation, water control and acidification complete device for oil and gas wells claim 2 wherein the screen member comprises an outer protective sleeve, a filter mesh, a flow guide mesh, a filter mesh, a flow guide mesh, and a backing layer fitted sequentially from the outside to the inside; circular through holes are distributed on the outer protective cover; wherein the flow guide network is used to guide the flow of the liquid; and wherein the filter net, the flow guide net and the backing layer are fixed by forging as a whole. Flow regulation, water control and acidification complete device for oil and gas wells claim 2 or 3 wherein the flow regulation and water control part comprises an outer pipe fixed to the outside of the base pipe and a flow regulation and water control element installed in the outer pipe on the wall of the base pipe; wherein a flow regulation and water control space is formed between the base tube and the outer tube; and wherein the flow regulation and water control element connects the interior of the base pipe to the flow regulation and water control space. Flow regulation, water control and acidification complete device for oil and gas wells claim 4 wherein the flow regulation and water control screen is an inflow water control screen; wherein the disposable component comprises: a flow sleeve fixed in the outer tube and dividing the flow regulation and water control space in the radial direction into an inner space and an outer space connected to the strainer part; wherein the flow regulation and water control element connects the interior space with the interior of the base tube; and wherein a communication hole for communicating the inner space and the outer space is provided on the flow sleeve; and a lock piston arranged in the outer space and slidable along the axial direction, and a first support spring; wherein the locking piston has a locking position for locking the communication hole and an open position for opening the communication hole; wherein the first support spring supports the lock piston in the lock position in the axial direction; and wherein the lockout piston is pushable by the formation fluid to move from the locked position to the open position. Flow regulation, water control and acidification complete device for oil and gas wells claim 5 wherein the inflow mechanism is an inflow bullet-breaking sliding sleeve connected to the lower end of the flow regulation and water control screen tube; wherein the inflow bullet refraction sliding sleeve comprises an outer sleeve and an inner sliding sleeve slidably inserted inside the outer sleeve; wherein a central channel is formed inside the inner sliding sleeve and a ball seat is fixed; between the inner sliding sleeve and the outer sleeve a slider firmly connected to the outside of the inner sliding sleeve and a second support spring supporting the slider axially; the slider being fixedly connected to the outer sleeve by a shear pin; wherein the acidification hole is provided on the outer sleeve; the inner slip sleeve being secured via the shear pin in a position to shut off the acidification well; wherein when the ball seat is locked by the ball throw and by pushing the pressure in the central channel exceeds a certain pressure value, the ball seat drives the inner sliding sleeve and the slide to shear the shear pin and move to open the acidification hole, and wherein when you stop pushing, the second support spring pushes the inner sliding sleeve to lock the acidification hole again. Flow regulation, water control and acidification complete device for oil and gas wells claim 6 wherein an upper port is connected to the upper end of the outer sleeve and a lower port is connected to the lower end of the outer sleeve, the position at which the inner sleeve blocks the acidification hole is such that the upper end of the inner sleeve is sealed in the upper port and the lower end of the inner sliding sleeve is seated in the lower connection in a sealed manner. Flow regulation, water control and acidification complete device for oil and gas wells claim 7 wherein the flow regulation, water control and acidification complete device for oil and gas wells is a channel switching tubing string for flow regulation, water control and segmented acidification; wherein the inflow water control screen tube and the inflow bullet refraction slide sleeve form a flow regulation, water control and acidification component; and wherein the channel-switching flow control, water control, and segmented acidification tubing string includes an upper packer, multiple flow control, water control, and acidification components, an isolation packer connected to two adjacent flow control, water control, and acidification components, a wellbore isolation valve, and two-stage floats. Flow regulation, water control and acidification complete device for oil and gas wells claim 4 wherein the flow regulation and water control strainer is a one-way valve type water control strainer; wherein the disposable component is fitted between and surrounding the outer tube and the base tube to divide the flow regulation and water control space along the axial direction into a first axial space connected to the strainer part and a second axial space connected to the flow regulation and water control element, spaced apart from each other are to subdivide; wherein the one-way component includes a first one-way ball seat and a second one-way ball seat coupled along the axial direction; wherein, along the direction of flow of the formation fluid, the first one-way ball seat is located upstream of the second one-way ball seat, the first one-way ball seat having circumferentially distributed first channels in a first number, the second one-way ball seat having circumferentially distributed second channels in a number greater than the first number is; wherein the second first plurality of channels and the first first plurality of channels are aligned in the axial direction one after the other, the remaining number of second channels being offset from the first channels; wherein, of the first passages and second passages aligned sequentially along the axial direction, a ball seat is disposed on the opposite snapped end portions of the first passages and the second passages, respectively, and a check valve ball is disposed in the opposite snapped ball seats. Flow regulation, water control and acidification complete device for oil and gas wells claim 9 wherein the inflow mechanism is a two-stage rupture sliding sleeve connected to the lower end of the one-way valve type water control screen tube, comprising: a sliding sleeve body on which the acidification hole is provided; an upper valve seat sliding sleeve slidably fitted in the sliding sleeve body and a lower valve seat sliding sleeve located below the upper valve seat sliding sleeve; wherein the inner diameter of the lower valve seat pusher sleeve is smaller than the inner diameter of the upper valve seat pusher sleeve, the lower valve seat pusher sleeve being positioned via a shear pin in a position for blocking the acidification hole; the upper valve seat slide sleeve being positioned above the lower valve seat slide sleeve via a shear pin; wherein the lower valve seat sliding sleeve can be pushed into the position for opening the acidification hole by compressive force after locking by ball throwing; and wherein the upper valve seat sliding sleeve can be slid to the acidification hole blocking position again by the compressive force after ball throw blocking. Flow regulation, water control and acidification complete device for oil and gas wells claim 10 wherein a lower terminal is connected to the lower end of the sliding sleeve body, a portion of the lower terminal protruding inside the lower end of the sliding sleeve body having a limiting end; wherein the lower valve seat sliding sleeve, when pushed by the ball throw to contact the restricting end, is restricted in the axial direction by the lower port; and wherein the upper valve seat sliding sleeve, when pushed by the shot to contact the lower valve seat sliding sleeve, is axially constrained by the lower valve seat sliding sleeve and blocks the acidification hole again. Flow regulation, water control and acidification complete device for oil and gas wells claim 11 wherein the flow regulation, water control and acidification complete device for oil and gas wells is a one-way valve type flow regulation, water control and acidification piping string; wherein the one-way valve type water control screen tube and the two-stage refraction sliding sleeve constitute a flow regulation, water control and acidification component; and wherein the one-way valve type flow regulation, water control and acidification tubing string comprises an upper packer, multiple flow regulation, water control and acidification components, an isolation packer connected to two adjacent flow regulation, water control and acidification components, a wellbore shut-off valve and two-stage floats. Flow regulation, water control and acidification complete device for oil and gas wells claim 4 wherein the flow regulation and water control strainer is an adaptive flow regulation and water control strainer comprising a strainer base tube and a water control base tube; wherein the screen base pipe and the water control base pipe are joined together to form a base pipe; wherein a guide channel is formed between the strainer and the base tube; wherein a connection component is fixedly connected to the outside of the base tube; wherein the connection component is fixedly connected to the lower end of the outer protective sheath and the upper end of the outer tube; a connection channel for connecting the guide channel and the flow regulation and water control space is provided on the connection component; wherein the water control base pipe is connected to the inner wall of the outer pipe at two axial ends of the flow regulation and water control space, respectively; wherein the water control base pipe is further provided with a pinch wall passage at the head of the flow regulation and water control space, and wherein a connection annulus is further provided between the upper end of the water control base pipe and the connection component, which connects between the connection passage and the pinch wall passage. Flow regulation, water control and acidification complete device for oil and gas wells Claim 13 wherein the inflow mechanism is an inflow break-through passage component connected to the top end of the flow regulation and water control screen tube; and wherein the inflow breaking passage component comprises: an outer cylindrical body; on the outer cylinder body, the acidification hole and a miniature check valve arranged in the acidification hole are arranged; an inner tube body fixedly fitted in the outer cylinder body; the interior of the inner tube body forming a central channel; wherein the central passage has a drain port communicating with the central annular space between the inner tubular body and the outer cylindrical body; further disposed in the central annular space is a rubber grommet fitted adjacent the exterior of the inner pipe body and covering the drain opening; and wherein the grommet can open the drain opening when the pressure in the central channel exceeds a first preset pressure. Flow regulation, water control and acidification complete device for oil and gas wells Claim 14 wherein the miniature check valve comprises a valve body fixed in the acidification hole, a check plate fixed to the radially outer end of the valve body, a valve ball located in the valve body, and a spring located between the valve ball and the check plate; and wherein the radially inner end of the valve body has a valve body seat blocked by the valve ball. Flow regulation, water control and acidification complete device for oil and gas wells claim 15 wherein the wall thickness of the rubber grommet along the axial direction from the top end to the bottom end is a stepped wall thickness; wherein the upper stepped wall thickness is greater than the lower stepped wall thickness. Flow regulation, water control and acidification complete device for oil and gas wells Claim 14 wherein the flow regulation, water control and acidification complete device for oil and gas wells is an adaptive flow regulation, water control and acidification tubing string; wherein the inflow fracturing passage component and the adaptive flow regulation and water control screen tube form the flow regulation, water control and acidification component; wherein the adaptive flow regulation, water control and acidification tubing string comprises an upper packer and a plurality of flow regulation, water control and acidification components; an expansion packer being positioned above and below each of the flow regulation, water control and acidification components; and where the adaptive flow regulation and water control sieve tube is further provided with a centralizer. A flow regulation, water control and acidification complete set for oil and gas wells, comprising: an upper packer, a plurality of flow regulation, water control and acidification components, a wellbore shut-off valve and a float connected in sequence from top to bottom; wherein an isolation packer is positioned between each two adjacent flow regulation, water control and acidification components; wherein the flow regulation, water control and acidification component comprises a flow regulation and water control screen tube and an inflow mechanism connected to the flow regulation and water control screen tube; wherein the flow regulation and water control screen tube comprises a base tube, a screen portion disposed on the base tube, and a flow regulation and water control portion connected to the screen portion; wherein the screen is used to filter the formation fluid; wherein the flow regulation and water control member is connected to the underflow of the screen member to increase the resistance to flow of water in the formation fluid; wherein a disposable component is further disposed on the base tube; wherein the disposable component is configured to allow the liquid to flow from the strainer portion to the flow regulation and water control portion and prevent the liquid from flowing from the flow regulation and water control portion to the strainer portion; wherein in the inflow mechanism there are arranged a central passage connected to the base pipe and an acidification hole for connecting the central passage to the outside of the inflow mechanism; and wherein the inflow mechanism is configured to manipulably open and close the acidification hole by pushing from outside the well.

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