CN112211591A - Pressure-testing delay toe end valve and method for establishing passage with stratum - Google Patents
Pressure-testing delay toe end valve and method for establishing passage with stratum Download PDFInfo
- Publication number
- CN112211591A CN112211591A CN202011231100.7A CN202011231100A CN112211591A CN 112211591 A CN112211591 A CN 112211591A CN 202011231100 A CN202011231100 A CN 202011231100A CN 112211591 A CN112211591 A CN 112211591A
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- China
- Prior art keywords
- valve
- delay
- pressure
- wall
- toe end
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
- E21B34/085—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained with time-delay systems, e.g. hydraulic impedance mechanisms
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The invention provides a pressure-testing delay toe end valve and a method for establishing a channel between the pressure-testing delay toe end valve and a stratum, wherein the pressure-testing delay toe end valve comprises a valve body, bosses and an opening valve, an upper connecting thread is arranged at an upper port of the valve body, a lower connecting thread is arranged at a lower port of the valve body, a plurality of bosses are arranged on the outer wall of the valve body along the radial direction, the bosses are all arranged in parallel, a diversion trench is arranged between every two adjacent bosses, a first through hole is arranged on each boss, an opening valve is arranged in each first through hole, and each opening valve comprises a starting disc, a delay valve and a locking screw which are sequentially arranged along the first through holes from inside. The pressure-testing delay toe end valve and the method for establishing the passage between the pressure-testing delay toe end valve and the stratum have the advantages that the opening valve is arranged in each through hole in the valve body, the structure is simple, the opening valve is connected to a well casing and is sent to a preset position in an oil well, the first through hole is communicated with the stratum under the pressure action of the displacement liquid, a liquid flow passage is established, perforation operation is not needed, and the safety is high.
Description
Technical Field
The invention belongs to the technical field of underground operation of petroleum and natural gas, and particularly relates to a pressure-testing time-delay toe end valve and a method for establishing a channel between the pressure-testing time-delay toe end valve and a stratum.
Background
After well cementation, a shaft is a closed cavity, and in order to provide a pumping circulation channel for later-stage fracturing transformation, a casing at the toe end of a well completion pipe column and an external cement sheath thereof need to be opened to communicate the shaft with the stratum.
Conventionally, a coiled tubing or a cable is used for carrying a downhole crawler and is perforated by a hydraulic or fire perforating gun, the mode cannot be improved for ultra-deep and ultra-long horizontal wells, the problem becomes a bottleneck problem in the field of development of long horizontal section well cementation horizontal wells at present, in order to solve the technical problem, the industry actively explores the combination of establishment of a pipe column toe end liquid circulation channel and casing operation for saving the perforation operation of a tool, so that the current situation that the current tool is not sent by a technical means is avoided, and the problems of long operation time, low operation efficiency, high construction cost and high risk caused by the fact that the tool is pulled out are reduced.
In various casing tool modes provided by the prior art, a port is opened through the action of mechanisms such as an air cavity, an explosion valve, an electric control element and the like, and the tools are complex due to the existence of the mechanism design, large in length, small in outer diameter, thick in wall thickness, smaller in inner drift diameter than a casing which is put into the casing and required to be matched with a special well cementing rubber plug, and meanwhile, as electromagnetic components have the characteristic of being easy to lose efficacy when meeting high temperature and humidity, the tools are applied to complex and variable well conditions, the stability is uncontrollable, and no rescue measures are needed after the failure; the blasting type is destructive and dangerous to a certain extent, and particularly, the operation of a gas well has great potential safety hazard.
Disclosure of Invention
In view of the above, the present invention is directed to a pressure-testing delay toe end valve and a method for establishing a passage with a formation thereof, so as to solve the deficiencies of the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a but pressure testing time delay toe end valve, includes valve body, boss and opens the valve, and the port is equipped with connecting thread on the valve body, and the port is equipped with down connecting thread under the valve body, and the valve body outer wall is along radially setting up a plurality of bosss, and a plurality of bosss are all parallel arrangement each other, and are equipped with the guiding gutter between two adjacent bosss, all are equipped with first through-hole on every boss, all install one in every first through-hole and open the valve, open the valve and include along first through-hole from interior to exterior compress tightly the start-up dish, delay valve and the locking screw that connect gradually, and start-up dish upper end contact connection to the lower extreme of delay valve, the upper surface of delay valve sets up the.
Furthermore, a first groove is formed in the upper end of the starting disc, a second groove is formed in the lower end of the delay valve, the first groove is communicated with the second groove, and the first groove and the second groove form a closed air cavity.
Furthermore, the opening valve also comprises a sealing ring, and the periphery of the starting disc and the periphery of the time delay valve are sleeved in the first through hole through a sealing ring.
Furthermore, the starting disc comprises a first cracking wall and a first supporting ring which are of an integral structure, one end of the first supporting ring is provided with the first cracking wall, a first groove is formed between the inner ring of the first supporting ring and the upper end of the first cracking wall, the time delay valve comprises a second cracking wall and a second supporting ring which are of an integral structure, one end of the second supporting ring is fixedly connected to the lower end of the second cracking wall, a second groove is formed between the inner ring of the second supporting ring and the lower end of the second cracking wall, the upper end of the second cracking wall is provided with the protective layer, and the periphery of the first supporting ring and the periphery of the second supporting ring are connected into the first through hole through a sealing ring.
Further, the first rupture wall may have any one of a flat plate structure, an arc-shaped protrusion structure and an arch-shaped structure.
Further, a ratio of a thickness dimension of the first rupture wall to an inner diameter dimension of the first support ring is 1:19, and a thickness of the first rupture wall is not more than 2 mm.
Further, the ratio of the thickness dimension of the second rupture wall to the inner diameter dimension of the second support ring is 4:19, and the thickness of the second rupture wall is no greater than 6 mm.
Further, the inner diameter of the first support ring is the same as the inner diameter of the second support ring.
Furthermore, the second rupture wall and the second support ring are both made of metal materials which can be dissolved in a solution containing cl.
Compared with the prior art, the pressure-testing time-delay toe end valve has the following advantages:
(1) according to the pressure-testing delay toe end valve, the opening valve is arranged in each through hole in the valve body, other complex parts are not arranged, the structure is simple, the manufacture is convenient, and the reliability of the device is high.
(2) According to the pressure-testing delay toe end valve, the plurality of bosses are arranged on the valve body and have a centering effect, one diversion trench is arranged between every two bosses, the plurality of diversion trenches can increase the annular flow area during well cementation, the thickness of each boss also increases the installation space for opening the valve, the space utilization is reasonable, and the manufacture is convenient.
The invention also aims to provide a method for establishing a channel between a pressure-testing delay toe end valve and a stratum, so as to solve the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for establishing a channel between a pressure-testing delay toe end valve and a stratum comprises the following steps:
s1, installing the pressure-testing delay toe end valve on the side wall of the shaft, and putting the pressure-testing delay toe end valve into a preset position in an oil well along with the shaft casing to finish well cementation;
s2, pressurizing the well bore to enable the pressure in the well bore to exceed the rupture threshold of the starting disc and not exceed the rupture threshold of the time delay valve;
s3, adding a solution containing cl into the shaft, and enabling the solution containing cl to be in contact with the delay valve for not less than 24 hours;
and S4, pressurizing the wellbore to break the delay valve, so that the solution containing cl flows out from the first through hole on the valve body, and the interior of the valve body is communicated with the stratum.
Compared with the prior art, the method for establishing the channel between the pressure-testing delay toe end valve and the stratum has the following advantages:
(1) according to the method for establishing the channel between the pressure-testing delay toe end valve and the stratum, the pressure-testing delay toe end valve is connected to the well casing and is conveyed to the preset position in the oil well, the first through hole is communicated with the stratum under the pressure action of the displacement liquid, the liquid flow channel is established, perforation operation is not needed, and the safety is high.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an explosive structure of a pressure-testable time-delay toe-end valve according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of a delay toe end valve with pressure testing according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
fig. 4 is an exploded view of an opening valve according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a flat plate configuration of a first rupture wall of an activation disc in accordance with an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a first rupture wall in an activation disc according to an embodiment of the present invention in the form of an arcuate bulge;
fig. 7 is a cross-sectional view of a first rupture wall of an activation disc according to an embodiment of the present invention in an arcuate configuration.
Description of reference numerals:
1-a valve body; 2-boss; 21-a first via; 3-opening the valve; 31-a starting disc; 311-a first groove; 312-a first support ring; 313 — a first rupture wall; 32-a time delay valve; 321-a second groove; 322-a second rupture wall; 323-a second support ring; 33-locking screws; 34-sealing ring.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figures 1-4, the pressure-testable time-delay toe end valve comprises a valve body 1, bosses 2 and an opening valve 3, wherein the upper port of the valve body 1 is provided with an upper connecting thread, the lower port of the valve body 1 is provided with a lower connecting thread, the outer wall of the valve body 1 is radially provided with a plurality of bosses 2, the plurality of bosses 2 are arranged in parallel, the plurality of bosses 2 have a righting effect, a diversion trench 4 is arranged between every two bosses 2, the diversion trenches 4 can increase the annular overflowing area during well cementation, each boss 2 is provided with a first through hole 21, the plurality of first through holes 21 are arranged in the circumferential direction of the valve body 21 in a stepped rising manner, the length of the first through holes 21 can be increased by the bosses 2, the opening valve 3 provides an installation space, the opening valve 3 comprises a starting disc 31, a time-delay valve 32 and a locking screw 33 which are sequentially pressed and connected from inside to outside along the first through holes 21, and the upper end of the starting disc, the upper surface of the delay valve 32 is coated with a protective layer which is a coating or a protective film, the protective layer or the coating is preferably made of vulcanized rubber, the periphery of the locking screw 33 is sleeved in the first through hole 21, the rupture pressure value of the delay valve 32 is greater than that of the starting disc 31, the rupture pressure value of the starting disc 31 is 30MPa, the rupture pressure value of the delay valve 32 which is not contacted with liquid is 100MPa, the liquid is a solution containing cl, the rupture pressure value is less than 20MPa because the delay valve 32 is corroded by the liquid after being contacted with the liquid for 24 hours, after the horizontal well is drilled, the upper connecting thread and the lower connecting thread of the valve body 1 of the tool are connected with a well completion casing, the horizontal well is lowered to a designed position, cement is introduced into the well bore, a well cementing rubber plug is put in, finally, a displacement fluid is introduced, a pump truck is used for suppressing pressure in the well bore of the oil well, when the internal pressure of the well bore exceeds 30MPa, namely, after the starting disc 31 is broken, the delay valve 32 is contacted with the displacing liquid, the breaking pressure of the delay valve is reduced to be less than 20Mpa after 24 hours, then the delay valve is broken after being pressed, a shaft is communicated with the stratum, the liquid flow channel of the first through hole 21 is completely communicated through the flushing corrosion of the solution containing cl, and the perforation operation is not needed.
As shown in fig. 2-3, the upper end of the starting disc 31 is provided with a first groove 311, the lower end of the delay valve 32 is provided with a second groove 321, the first groove 311 is communicated with the second groove 321, the first groove 311 and the second groove 321 form a closed air cavity, the delay valve 32 can ensure that the starting disc 31 cannot be fractured inwards, and simultaneously provide the closed air cavity for the starting disc 31, so that the starting disc 31 has a fracturing space, and can be opened by absolute pressure to prevent the failure of the starting disc 31 caused by reverse differential pressure, and improve the success rate of fracturing.
As shown in fig. 4, the opening valve 3 further includes a sealing ring 34, the periphery of the starting disc 31 and the periphery of the delay valve 32 are both sleeved in the first through hole 21 through one sealing ring 34, the starting disc 31 can only be ruptured in one direction, the sealing ring 34 can ensure that the solution in the shaft does not enter the outer side of the starting disc 31, the starting disc 31 cannot be ruptured due to pressure balance is avoided, double sealing is formed between the starting disc 31 and the delay valve 32, and a sealed air cavity is formed between the starting disc 31 and the delay valve 32.
As shown in fig. 4-7, the activation disc 31 includes a first rupture wall 313 and a first support ring 312 of an integral structure, the first rupture wall 313 and the first support ring 312 are both made of aircraft aluminum, one end of the first support ring 312 is provided with the first rupture wall 313, an inner ring of the first support ring 312 and an upper end of the first rupture wall 313 form a first groove 311, the delay valve 32 includes a second rupture wall 322 and a second support ring 323 of an integral structure, the second rupture wall 322 and the second support ring 323 are both made of a zinc-magnesium alloy, one end of the second support ring 323 is fixedly connected to a lower end of the second rupture wall 322, an inner ring of the second support ring 323 and a lower end of the second rupture wall 322 form a second groove 321, an upper end of the second rupture wall 322 is provided with the protection layer, an outer periphery of the first support ring 312 and an outer periphery of the second support ring 323 are both sleeved into the first through hole 21 by a sealing ring 34, the first rupture wall 313 is a flat plate structure, The flat plate structure is suitable for well conditions with general pressure; the arc-shaped convex structure is suitable for well conditions with lower pressure; the arc-shaped concave bottom structure is suitable for well conditions with higher pressure.
The ratio of the thickness dimension of the first rupture wall 313 to the inner diameter dimension of the first support ring 312 is 1:19, and the thickness of the first rupture wall 313 is not more than 2mm, so that the rupture pressure of the partial structure is controlled within 30MPa, and the reliability of the device is improved.
The ratio of the thickness dimension of the second rupture wall 322 to the inner diameter dimension of the second support ring 323 is 4:19, the thickness of the second rupture wall 322 is not more than 6mm, and the inner diameter of the first support ring 312 is the same as the inner diameter of the second support ring 323, ensuring that the pressure resistance of this partial structure is controlled to be above 100 MPa.
The method for establishing the channel between the pressure-testing delay toe end valve and the stratum comprises the following steps: a worker puts the pressure-testing delay toe end valve into a preset position in an oil well along with a shaft sleeve, and injects cement outside the shaft, the well head is pressurized to suppress the pressure of the shaft, the pressure in the shaft is suppressed to 20-100 MPa, so that the first rupture wall 313 of the opening valve 3 is ruptured, then a solution containing cl is injected into the valve body 1, the well head is repressurized after the solution containing cl is contacted with the second rupture wall 322 for 24 hours, the second rupture wall 322 is ruptured under the pressure within 20MPa as the delay valve 32 is corroded by the liquid, so that high-pressure displacement liquid is communicated with a stratum from a first through hole 21 on the valve body 1, a liquid flow channel is established, perforation operation is not needed, and the stability of an inner-layer rupture disc and an outer-layer rupture disc is easy to control and high in safety.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. But pressure testing time delay toe end valve, its characterized in that: the valve comprises a valve body (1), bosses (2) and opening valves (3), wherein connecting threads are arranged at the upper end opening of the valve body (1), lower connecting threads are arranged at the lower end opening of the valve body (1), a plurality of bosses (2) are radially arranged on the outer wall of the valve body (1), the bosses (2) are arranged in parallel, a diversion trench is formed between every two adjacent bosses (2), a first through hole (21) is formed in each boss (2), one opening valve (3) is installed in each first through hole (21), each opening valve (3) comprises a starting disc (31), a delay valve (32) and a locking screw (33) which are sequentially compressed and connected from inside to outside along the first through hole (21), the upper end of each starting disc (31) is connected to the lower end of the corresponding delay valve (32) in a contact mode, and a protective layer is arranged on the upper surface of the corresponding delay valve (32).
2. The delay toe end valve with pressure test as claimed in claim 1, wherein: the upper end of the starting disc (31) is provided with a first groove (311), the lower end of the delay valve (32) is provided with a second groove (321), the first groove (311) is communicated with the second groove (321), and the first groove (311) and the second groove (321) form a closed air cavity.
3. The delay toe end valve with pressure test of claim 2, wherein: the opening valve (3) further comprises a sealing ring (34), and the periphery of the starting disc (31) and the periphery of the delay valve (32) are sleeved in the first through hole (21) through one sealing ring (34).
4. The delay toe end valve with pressure test of claim 3, wherein: the starting disc (31) comprises a first fracture wall (313) and a first support ring (312) which are of an integrated structure, one end of the first support ring (312) is provided with the first fracture wall (313), the inner ring of the first support ring (312) and the upper end of the first fracture wall (313) form a first groove (311), the delay valve (32) comprises a second fracture wall (322) and a second support ring (323) which are of an integrated structure, one end of the second support ring (323) is fixedly connected to the lower end of the second fracture wall (322), the inner ring of the second support ring (323) and the lower end of the second fracture wall (322) form a second groove (321), the upper end of the second fracture wall (322) is provided with the protective layer, and the periphery of the first support ring (312) and the periphery of the second support ring (323) are sleeved in the first through hole (21) through a sealing ring (34).
5. The delay toe end valve with pressure test as claimed in claim 4, wherein: the first rupture wall (313) is any one of a flat plate structure, an arc-shaped convex structure and an arch-shaped structure.
6. The delay toe end valve with pressure test as claimed in claim 4, wherein: the ratio of the thickness dimension of the first rupturing wall (313) to the inner diameter dimension of the first support ring (312) is 1:19, and the thickness of the first rupturing wall (313) is not more than 2 mm.
7. The delay toe end valve with pressure test as claimed in claim 4, wherein: the ratio of the thickness dimension of the second rupture wall (322) to the inner diameter dimension of the second support ring (323) is 4:19, and the thickness of the second rupture wall (322) is no greater than 6 mm.
8. The delay toe end valve with pressure test as claimed in claim 4, wherein: the inner diameter of the first support ring (312) is the same as the inner diameter of the second support ring (323).
9. The delay toe end valve with pressure test as claimed in claim 4, wherein: the second rupture wall (322) and the second support ring (323) are both made of metal material which can be dissolved in the solution containing cl.
10. The method of establishing a passageway with a formation by a delay toe end valve under pressure test as claimed in any one of claims 1 to 9, wherein: the method comprises the following steps:
s1, installing the pressure-testing delay toe end valve on the side wall of the shaft, and putting the pressure-testing delay toe end valve into a preset position in an oil well along with the shaft casing to finish well cementation;
s2, pressurizing the well bore to enable the pressure in the well bore to exceed the rupture threshold of the starting disc (31) and not exceed the rupture threshold of the time delay valve (32);
s3, adding a solution containing cl into the shaft, and enabling the solution containing cl to be in contact with the delay valve (32) for not less than 24 hours;
and S4, pressurizing the wellbore to break the delay valve (32), so that the solution containing cl flows out from the first through hole (21) on the valve body (1), and the interior of the valve body (1) is communicated with the stratum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011231100.7A CN112211591A (en) | 2020-11-06 | 2020-11-06 | Pressure-testing delay toe end valve and method for establishing passage with stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011231100.7A CN112211591A (en) | 2020-11-06 | 2020-11-06 | Pressure-testing delay toe end valve and method for establishing passage with stratum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112211591A true CN112211591A (en) | 2021-01-12 |
Family
ID=74058273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011231100.7A Pending CN112211591A (en) | 2020-11-06 | 2020-11-06 | Pressure-testing delay toe end valve and method for establishing passage with stratum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112211591A (en) |
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2020
- 2020-11-06 CN CN202011231100.7A patent/CN112211591A/en active Pending
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