CN113863888B - Underground three-channel integrated blowout preventer for double-tube drilling - Google Patents
Underground three-channel integrated blowout preventer for double-tube drilling Download PDFInfo
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- CN113863888B CN113863888B CN202111211069.5A CN202111211069A CN113863888B CN 113863888 B CN113863888 B CN 113863888B CN 202111211069 A CN202111211069 A CN 202111211069A CN 113863888 B CN113863888 B CN 113863888B
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- pipe
- sliding sleeve
- inner pipe
- annular
- blowout preventer
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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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
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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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
Abstract
The invention relates to an underground three-channel integrated blowout preventer for double-pipe drilling. The device consists of an internal plugging device and an external annular space packer, wherein the internal plugging device consists of an inner pipe plugging mechanism and an annular space plugging mechanism. The inner pipe plugging mechanism mainly comprises a sliding sleeve inner pipe, a valve plate and the like; the annular plugging mechanism mainly comprises a lower inner tube, an annular plugging sliding sleeve and the like; the outer annular packer mainly comprises an upper sliding sleeve, a rubber sleeve, a locking component and the like. The invention has the advantages that complex conditions such as sudden well invasion and well kick at the bottom of the well are frequently encountered in the double-layer pipe drilling process, when the flow entering the shaft reaches the set closing flow of the internal plugging device, three channels of a pipe passage in the double-layer pipe, an annular passage and an outer annular passage can be integrated, rapidly and automatically plugged, and serious accidents such as blowout and the like are prevented; the plugging mechanism has a locking function; the device has a positive pressure pumping function, and can also perform well killing operation when being closed; the inner plugging device is of a replaceable structure and can adapt to different opening flows according to different well conditions.
Description
Technical Field
The invention relates to the field of oil and gas drilling engineering, in particular to an underground three-channel integrated blowout preventer for double-layer pipe drilling.
Background
Compared with the traditional drilling technology, the double-layer pipe drilling technology has the advantages of low drilling cost, high drilling efficiency, no pollution caused by continuous sampling and the like, so the double-layer pipe drilling technology is widely applied to the resource exploitation aspects of geothermal exploitation, coal exploitation, deep water oil and gas exploitation, hydrographic water well drilling, natural gas exploitation and the like. Different from conventional drilling, the double-layer pipe drilling is provided with an inner pipe channel, an inner pipe annular channel, an outer pipe annular channel and an outer annular channel between a double-layer drill rod and a well wall; the dual-gradient drilling and reverse circulation drilling are two typical applications of double-layer pipe drilling, both have similar medium flow principles, and generally, drilling fluid is injected from an orifice through an annular channel between an inner pipe and an outer pipe of the double-layer pipe, and after reaching the bottom of a well, rock debris carried by the drilling fluid enters a drill string through reverse circulation of a drill bit, so that the drilling fluid carries the rock, and then returns to the ground surface from the inner pipe channel of the double-layer pipe in a reverse circulation mode.
In the process of double-layer pipe drilling operation, underground complex conditions such as well invasion, overflow and the like easily occur when shallow gas and reservoir layers and the like are drilled, and if the underground complex conditions cannot be quickly controlled in the early stage, dangerous accidents such as blowout and the like can be caused, so that life and property loss and environmental ecological pollution are brought. The underground blowout preventer is a key barrier for timely controlling blowout accidents, and currently, the underground blowout preventer can be applied to double-pipe drilling, but various problems exist in the aspects of functionality, safety and applicability, and mainly comprise the following aspects:
(1) the existing blowout preventer for double-layer pipe drilling can only block an inner pipe channel and an annular channel, namely, can only block two channels but cannot realize the blocking of the annular channel outside the double-layer pipe;
(2) after a plugging mechanism of the blowout preventer for double-layer pipe drilling works, the plugging mechanism does not have self-locking capability, so that the consequences of poor plugging and poor plugging effect are caused when the bottom hole pressure fluctuates;
(3) after the blowout preventer of the existing double-pipe well drilling is closed, the function of lowering heavy mud into the well bottom to carry out well killing operation after the stable plugging of a channel is finished is not realized;
(4) the size of a sliding sleeve inner pipe and the parameters of a return spring in the blowout preventer of the existing double-pipe drilling are fixed, and the sliding sleeve inner pipe cannot move under the overflow conditions of different well depths and different flows so as to drive a plugging mechanism to close.
In order to effectively solve the defects of the conventional underground blowout preventer, the underground automatic blowout preventer is invented aiming at the double-layer pipe drilling process and the three-channel structural characteristics thereof, so that the quick response to dangerous working conditions such as overflow and the like is realized, the integrated closing of three underground channels is effectively realized in time, and the safety of the double-layer pipe drilling operation is better ensured.
Disclosure of Invention
In order to solve the problems, the invention provides a double-tube drilling underground three-channel integrated blowout preventer, which adopts a sliding sleeve inner tube and an annular plugging sliding sleeve with coaxial throttling function, and simultaneously arranges a calabash string cavity in the sliding sleeve inner tube, and utilizes the difference of the flow of circulating medium passing through the sliding sleeve inner tube and an annular plugging sliding block during normal drilling and overflow to drive the sliding sleeve inner tube and the annular plugging sliding sleeve to move upwards by using the pressure difference generated at the throttling position of the sliding sleeve inner tube, the calabash string cavity and the throttling position of the annular plugging sliding sleeve as driving force, the resistance of the lower section of the sliding sleeve inner tube to a valve plate is smaller and smaller when the sliding sleeve inner tube moves upwards, when the annular plugging sliding sleeve moves to the stepped limiting shaft shoulder in the lower inner tube, the closing of an annular channel is realized, and the valve plate is completely closed under the action of a torsion spring and shaft bottom fluid, the closing of the inner tube channel is realized, by increasing the bit pressure, when the bit pressure reaches a certain value, the shearing pin is sheared off, the upper drill string compresses the rubber cylinder through the self gravity action, and the lock catch gradually bites the lock catch seat to expand the rubber cylinder and contact with the well wall to generate sealing, so that the sealing of an outer annular hollow channel between the outer pipe and the well wall is realized, and the problem that the traditional blowout preventer can only block two channels, namely a double-layer pipe inner channel and a double-layer pipe outer channel, is solved; meanwhile, a one-way tooth-shaped sleeve is additionally arranged at the upper end of the inner pipe of the sliding sleeve, the inner pipe of the sliding sleeve is connected with the one-way tooth-shaped sleeve through a shear pin, corresponding tooth-shaped steps are arranged at corresponding positions in the lower inner pipe, the inner pipe of the sliding sleeve moves upwards to drive the one-way tooth-shaped sleeve to gradually engage with the tooth-shaped steps arranged in the lower inner pipe, and the inner pipe of the sliding sleeve and the annular plugging sliding sleeve are locked, so that the problem that the traditional blowout preventer cannot be locked when the blowout preventer is opened due to bottom pressure fluctuation in the plugging process is solved; when a well is required to be pressurized, when heavy mud is injected into the annular channel by a counter-pressure method, when the static pressure of a liquid column of the heavy mud is greater than the bottom pressure, the annular sealing sliding sleeve has a downward moving trend, the inner tube of the sliding sleeve is further driven to have a downward moving trend, when the static pressure of the liquid column reaches a certain value and under the action of a return spring, a shearing pin connected with the one-way tooth-shaped sleeve of the inner tube of the sliding sleeve is sheared, the annular sealing sliding sleeve and the inner tube of the sliding sleeve slide downwards, the inner tube of the sliding sleeve further downwards moves to open the valve plate, and the channel of the inner tube and the channel of the annular channel are further opened, so that the well-pressurizing operation can be carried out, and the problem that the sealing channel can only be opened by external force after the traditional blowout preventer is closed is solved; the inner plugging device is set to be replaceable and matched with the sliding sleeve inner pipe and the reset spring with corresponding sizes aiming at downhole overflow with different well depths and different flow rates, the inner plugging device is replaced in time in the drilling process, and the problem that a plugging mechanism cannot respond quickly aiming at different well depths and different overflow flow rates in the traditional blowout preventer is solved.
The following technical scheme is adopted to solve the technical problems of the invention: a double-layer pipe drilling down-hole three-channel integrated blowout preventer is characterized in that a one-way tooth-shaped sleeve is arranged at the upper end of an inner pipe of a sliding sleeve through four shearing pins which are uniformly distributed in the circumferential direction, a shearing pin protective sleeve is arranged outside the shearing pins and is arranged in a shearing pin hole in an interference fit manner, a reset spring is arranged between the inner pipe of the sliding sleeve and a lower inner pipe, the inner pipe of the sliding sleeve is connected with an annular plugging sliding sleeve through a bolt, a corresponding key slot opening is formed in the lower inner pipe, the stepped sealing surface at the upper part of the annular plugging sliding sleeve is matched with a stepped limiting shaft shoulder in the lower outer pipe, a valve seat is connected with the lower inner pipe through a thread, a lower joint of the inner pipe is connected with the valve seat through a thread, a centering block I and a centering block II are arranged between the lower inner pipe and the lower outer pipe, the centering block is positioned through a positioning shaft shoulder, wherein the one-way tooth-shaped sleeve is in clearance fit with the inner pipe of the sliding sleeve, and the inner pipe of the sliding sleeve is in clearance fit with the lower inner pipe, the lower inner pipe and the annular sealing sliding sleeve are also in clearance fit; the inner pipe channel is sealed by a valve plate and a torsional spring which are arranged on a valve seat through pins, the valve plate is in an open state at the position of the lower section of the inner pipe of the sliding sleeve during normal drilling, and if the resistance of the lower section of the inner pipe of the sliding sleeve is not provided, the valve plate is in a normally closed state under the action of the torsional spring; the outer annular packer is characterized in that an upper inner tube is in threaded connection with an inner tube short joint through an upper inner tube, the upper inner tube is connected with an upper inner sliding sleeve through four circumferentially uniformly distributed shear pins, shear pin protective sleeves are arranged outside the shear pins and are arranged in the shear pin holes in an interference fit mode, the upper inner sliding sleeve is in threaded connection with an inner tube upper joint, the upper outer tube is in threaded connection with the outer tube short joint, the upper outer tube is connected with the upper outer sliding sleeve through four circumferentially uniformly distributed shear pins, the shear pin protective sleeves are arranged outside the shear pins and are arranged in the shear pin holes in an interference fit mode, the upper outer sliding sleeve is in threaded connection with an outer tube upper joint, a centering block III is arranged between the inner tube upper joint and the outer tube upper joint, and the centering block III is positioned through a positioning shaft shoulder; outer tube short circuit passes through threaded connection, outer tube short circuit and last outer tube with lower outer tube and passes through threaded connection, and the hasp is connected with last outer sliding sleeve through the shearing pin of four circumference equipartitions, and it is downthehole that the shearing pin protective sheath is equipped with to the pin outside and packs into the shearing pin through interference fit, and the hasp seat passes through the screw thread and installs in the lower part of last outer tube, and the packing element is installed on the outer tube short circuit, goes up outer sliding sleeve lower part and packing element contact and makes it fixed.
The inner pipe upper joint and the outer pipe upper joint are both provided with tapered male buckles and external threads connected with the upper inner sliding sleeve and the upper outer sliding sleeve.
The lower joint of the inner pipe is provided with a tapered female buckle and an internal thread connected with the valve seat.
The centralizing blocks I, II and III are provided with overflowing holes.
The stepped sealing surface is composed of a boss with a small upper part and a big lower part, the sealing end surface is a conical surface on the boss, and an O-shaped sealing ring groove is arranged on the conical surface.
The lower inner tube is provided with a key slot opening and a tooth-shaped step, the key slot opening limits the moving range of the bolt, and the tooth-shaped step locks the one-way tooth-shaped sleeve.
The lower outer tube is provided with a tapered female buckle, positioning shaft shoulders I and II and a stepped limiting shaft shoulder matched with a stepped sealing surface on the upper part of the annular plugging sliding block.
The shearing pins are circumferentially and uniformly distributed around the pipe wall and are used for connecting the upper inner pipe with the upper inner sliding sleeve, the upper outer pipe with the upper outer sliding sleeve, the upper outer sliding sleeve with the lock catch, and the sliding sleeve inner pipe with the one-way tooth-shaped sleeve.
The invention has the advantages of
(1) When dangerous working conditions such as well invasion, overflow and the like occur in the double-layer pipe drilling process, three channels of a double-layer pipe inner pipe channel, a double-layer pipe outer pipe channel and a double-layer pipe outer annular channel can be automatically and integrally plugged in time, so that major accidents such as blowout and the like are prevented, and the safety of a drilling platform is ensured.
(2) After the blowout preventer realizes plugging, the plugging mechanism can carry out self-locking, the plugging effect can not be influenced by bottom-hole pressure fluctuation to cause the situation that the plugging mechanism is closed when opened at the plugging position, and the plugging performance is reliable.
(3) After the blowout preventer is closed due to overflow and other reasons, the blowout preventer has the function of automatically opening the plugging mechanism by dropping heavy mud, and further performs well killing operation.
(4) The inner plugging device is replaceable, and can be timely replaced to adapt to different well depths and different overflow flows in the drilling process, so that the blowout preventer can quickly respond and quickly close the plugging mechanism when overflow occurs.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic view of the blowout preventer in an open position and in a closed position according to the present invention;
FIG. 3 is a quarter sectional three-dimensional schematic view of the fitting on the inner pipe of the present invention;
FIG. 4 is a quarter sectional three-dimensional schematic view of the upper and inner sliding sleeves of the present invention;
FIG. 5 is a three-dimensional view in quarter section of the upper inner tube of the present invention;
FIG. 6 is a cross-sectional three-dimensional view of a quarter of the inner tube short of the present invention;
FIG. 7 is a cross-sectional three-dimensional view of a quarter of the lower inner tube of the present invention;
FIG. 8 is a one-quarter cross-sectional three-dimensional schematic view of a one-way tooth sleeve of the present invention;
FIG. 9 is a quarter sectional three-dimensional schematic view of the inner tube of the sliding sleeve of the present invention;
FIG. 10 is a schematic cross-sectional view of one quarter of the annulus plugging sliding sleeve of the present invention;
FIG. 11 is a three-dimensional schematic view of a torsion spring valve plate and valve seat of the present invention;
FIG. 12 is a quarter sectional view of the lower joint of the inner pipe of the present invention;
FIG. 13 is a schematic sectional view of a quarter of a lower outer tube of the present invention;
FIG. 14 is a schematic cross-sectional view of a short quarter of an outer tube according to the present invention;
FIG. 15 is a cross-sectional view of a quarter of the latch base of the present invention;
FIG. 16 is a quarter sectional view of the latch of the present invention;
FIG. 17 is a schematic sectional view of a quarter of an upper outer tube of the present invention;
FIG. 18 is a schematic sectional view of a quarter of the upper and outer sliding sleeves of the present invention;
FIG. 19 is a quarter sectional view of the upper fitting of the outer tube of the present invention;
in the figure, 1, an upper connector of an inner pipe, 101, an external thread I; 2-upper inner sliding sleeve, 201-pin hole, 202-internal thread I; 3-upper inner tube, 301-internal thread II, 302-pin hole; 4-inner pipe short joint, 401-internal thread III, 402-external thread II; 5-lower inner tube, 501-internal thread IV, 502-key notch, 503-positioning shaft shoulder I, 504-external thread III, 505-tooth-shaped step; 6-one-way tooth-shaped sleeve, 601-pin hole, 602-tooth-shaped step, 603-step; 7-a sliding sleeve inner pipe, 701-a bolt hole, 702-a bolt hole, 703-a gourd string cavity and 704-a variable diameter surface I; 8-annular sealing sliding sleeve, 801-bolt hole, 802-annular sealing ring groove, 803-stepped sealing surface and 804-variable diameter surface II; 9-valve seat, 9-1-torsion spring, 9-2-pin shaft, 901-pin shaft hole, 902-external thread IV and 903-external thread V; 10-inner pipe lower joint, 1001-positioning shaft shoulder II, 1002-internal thread V; 11-a valve plate; 12-a centering block I; 13-a bolt; 14-a return spring; 15-shear pin I; 16-a righting block II; 17-lower outer tube, 1701-positioning shaft shoulder III, 1702-stepped limiting shaft shoulder and 1703-positioning shaft shoulder IV; 18-outer pipe short joint, 1801-internal thread VI, 1802-external thread VI; 19-a lock catch seat, 1901-an internal thread VII, 1902-a trapezoidal inclined plane I; 20-a rubber cylinder; 21-lock catch, 2101-pin hole, 2102-trapezoidal bevel II; 22-shear pin ii; 23-upper outer tube, 2301-external thread VII, 2302-pin hole; 24-shear pin iii; 25-upper outer sliding sleeve, 2501-pin hole, 2502-pin hole, 2503-internal thread VIII; 26-a righting block III; 27-outer tube upper joint, 2701-external threads VIII, 2702-positioning shaft shoulder V.
Detailed Description
The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following description: the utility model provides a three channel integration blowout preventer in double-deck pipe drilling well, this blowout preventer comprises inside plugging device and outer annular space packer, and inside plugging device comprises inner tube shutoff mechanism and annular space shutoff mechanism. The inner tube plugging mechanism and the annular plugging mechanism comprise a sliding sleeve inner tube 7, a lower inner tube 5, a reset spring 14, a one-way tooth-shaped sleeve 6, a shearing pin I15, a torsion spring 9-1, a pin 9-2, a valve plate 11, a bolt 13, an annular plugging sliding sleeve 8, a valve seat 9 and an inner tube lower joint 10, wherein the one-way tooth-shaped sleeve 6 is arranged at the upper end of the sliding sleeve inner tube 7 through the shearing pin I15, the sliding sleeve inner tube 7 is positioned through a step 603, the resetting spring 14 is arranged between the sliding sleeve inner tube 7 and the lower inner tube 5, the sliding sleeve inner tube 7 is connected with the annular plugging sliding sleeve 8 through the bolt 13, the lower inner tube 5 is provided with a corresponding key slot 502, a stepped sealing surface 803 at the upper part of the annular plugging sliding sleeve 8 is matched with a stepped limiting shaft shoulder 1702 at the plugging part in the lower outer tube 17, a sealing ring groove I802 is arranged on the stepped sealing surface 803, and a centering block I12 is arranged between the lower inner tube 5 and the lower outer tube 17, The centralizing block II 16, the centralizing block I12 and the centralizing block II 16 are positioned by a positioning shaft shoulder III 1701 and a positioning shaft shoulder IV 1703 respectively. The outer annular empty packer comprises an inner tube short joint 4, an upper inner tube 3, an upper inner sliding sleeve 2, an inner tube upper joint 1, an outer tube short joint 18, an upper outer tube 23, an upper outer sliding sleeve 25, an outer tube upper joint 27, a lock 21, a lock seat 19, a rubber cylinder 20, a shear pin III 24 and the like, wherein the inner tube short joint 4 is in threaded connection with the lower inner tube 5 and the upper inner tube 3, the upper inner tube 3 is connected with the upper inner sliding sleeve 2 through four shear pins III 24 which are uniformly distributed, a shear pin protective sleeve III 24-1 is arranged outside the shear pin III 24 and is arranged in a shear pin hole through interference fit, and the upper inner sliding sleeve 2 is in threaded connection with the inner tube upper joint 1; the outer pipe short joint 18 is connected with the lower outer pipe 17 and the upper outer pipe 23 through threads, the upper outer pipe 23 is connected with the upper outer sliding sleeve 25 through four uniformly distributed pins which are the same as the shearing pins III 24, a protective sleeve which is the same as the shearing pin protective sleeve III 24-1 is arranged outside the pins and is arranged in a shearing pin hole through interference fit, the upper outer sliding sleeve 25 is connected with the outer pipe upper joint 27 through threads, the lock catch 21 is connected with the lower part of the upper outer sliding sleeve 25 through four uniformly distributed shearing pins II 22, the shearing pin protective sleeve II 22-1 is arranged outside the pins and is arranged in the shearing pin hole through interference fit, the lock catch seat 19 is arranged at the lower part of the upper outer pipe 23 through threads, the rubber cylinder 20 is arranged on the outer pipe short joint 18, and the lower part of the upper outer sliding sleeve 25 is in contact with the rubber cylinder 20 and is fixed. A centering block III 26 is arranged between the inner pipe upper joint 1 and the outer pipe upper joint 27, and the centering block III 26 is positioned through a positioning shaft shoulder V2702.
The working process of the invention is as follows:
in the normal drilling process, the underground blowout preventer is in an open state, drilling fluid is pumped in from a double-layer pipe annulus, the drilling fluid flows into the double-layer drill pipe annulus connected to the upper part of the underground blowout preventer, passes through an annular channel formed by an annulus plugging sliding sleeve 8 and the inner wall of a lower outer pipe 17, flows into the double-layer drill pipe annulus connected to the lower part of the underground blowout preventer until reaching the bottom of the well, and returns from an inner pipe channel along with rock debris after passing through a bottom drill bit, and when the drilling fluid along with the rock debris passes through an inner pipe 7 of a sliding sleeve of the underground blowout preventer, the pressure of the large diameter end of the reducing section is greater than that of the small diameter end due to the gradual reduction of the flow passage in the reducing section, thereby forming pressure drop, the variable diameter section and the cavity of the gourd string generate upward thrust, the inner tube 7 of the sliding sleeve can not be pushed upwards due to the pre-tightening force of the spring and the existence of the one-way tooth-shaped sleeve 6, the downhole blowout preventer remains open, and drilling fluid carries cuttings back to the surface mud system from the inner pipe passage.
When encountering dangerous working conditions such as overflow, blowout and the like in the drilling process, bottom-hole fluid upwards gushes out through a double-layer pipe inner pipe channel, an annular channel and an outer annular channel at a flow speed threshold value which is larger than that set by an internal plugging device, and a large amount of bottom-hole fluid returns upwards to a sliding sleeve inner pipe 7 and an annular plugging sliding sleeve 8 of the underground blowout preventer, the pressure at the large-diameter end of a reducing section of the sliding sleeve inner pipe 7 and the annular plugging sliding sleeve 8 is larger than the pressure at the small-diameter end, so that pressure drop is formed, upward thrust is generated at the reducing section, the generated thrust overcomes the pre-tightening force of a return spring 14 and the resistance of a tooth-shaped step 505 arranged in a lower inner pipe 5 to a one-way tooth-shaped sleeve 6, the sliding sleeve inner pipe 7 and the annular plugging sliding sleeve 8 are pushed to move upwards along the axial line of the one-way tooth-shaped plugging sliding sleeve 8 until the annular plugging sliding sleeve 8 moves to a step-shaped limiting axial shoulder 1702, and at the moment, the one-way tooth-shaped sleeve 6 is locked by the tooth-shaped step 505 arranged in the lower inner pipe 5 and cannot move downwards, namely, the inner tube 7 of the sliding sleeve and the annular plugging sliding sleeve 8 are locked, so that the annular plugging sliding sleeve is prevented from being opened and closed when the plugging position is opened due to the vertical sliding caused by the pressure fluctuation of the bottom hole; the stepped sealing surface 803 and the stepped limiting shaft shoulder 1702 cooperate to form a stepped surface seal, so that bottom hole fluid can not flow upwards through the annular channel of the double-layer pipe. Meanwhile, the small-diameter end of the lower part of the sliding sleeve inner tube 7 positioned beside the valve plate 11 moves upwards, the valve plate 11 starts to be closed under the simultaneous action of the shaft bottom fluid and the torsion spring 9-1, when the valve plate 11 is completely closed, the inner tube channel of the double-layer tube is blocked, and the shaft bottom fluid can not flow upwards through the inner tube channel of the double-layer tube. And meanwhile, the bit pressure is increased, eight pins such as a shearing pin 24 and the like are sheared off, under the action of the self gravity of an upper drill string, the upper inner sliding sleeve 2 and the upper outer sliding sleeve 25 synchronously start to move downwards, the upper outer sliding sleeve 25 is in contact with the rubber barrel 20 and compresses the rubber barrel 20 to deform and expand, meanwhile, in the deformation process of the rubber barrel 20, the upper outer sliding sleeve 25 pushes the lock catch 21 to move downwards, the lock catch 21 is meshed with the lock catch seat 19 step by step, and when the rubber barrel 20 deforms to completely seal an outer annular hollow channel between the double-layer drill rod and the well wall, the seat sealing process is completed. The dual tubing downhole blow out preventer thus transitions from an open condition to a fully closed condition.
According to the dual-layer pipe drilling downhole three-channel integrated blowout preventer, when blowout occurs at the bottom of a well, a large amount of fluid returning upwards from the bottom of the well flows through the sliding sleeve inner pipe and the annular sealing sliding sleeve of the blowout preventer, an upward thrust is generated under the throttling action, the thrust overcomes the pre-tightening force of the reset spring and the resistance of the tooth-shaped step, the sliding sleeve inner pipe and the annular sealing sliding sleeve are pushed to move upwards along the axis until the stepped sealing surface on the annular sealing sliding sleeve is matched with the stepped limiting shaft shoulder arranged on the inner surface of the lower outer pipe to complete dual-layer pipe annular channel sealing, and meanwhile, as the small-diameter section at the lower part of the sliding sleeve inner pipe moves upwards along the axis, the valve plate is closed under the action of the fluid and the torsion spring to complete dual-layer pipe inner pipe channel sealing; and simultaneously increasing the bit pressure, cutting eight pins such as pins and the like, synchronously starting to move downwards by the upper inner sliding sleeve and the upper outer sliding sleeve under the action of the self gravity of an upper drill string, contacting the upper outer sliding sleeve with the rubber cylinder and compressing the rubber cylinder to deform and expand, simultaneously pushing the lock catch to move downwards by the upper outer sliding sleeve in the deformation process of the rubber cylinder, engaging the lock catch with the lock catch seat step by step, and finishing the seat sealing process when the rubber cylinder deforms to completely seal an outer annular hollow channel between the double-layer drill rod and the well wall. So far, the fluid at the bottom of the well can not flow out upwards through three channels of the double-layer pipe, and the double-layer pipe underground blowout preventer is completed by switching from an open state to a closed state. The invention can realize the simultaneous and complete sealing of the pipe passage in the double-layer pipe, the annular passage of the double-layer pipe and the annular passage outside the double-layer pipe when dangerous working conditions such as overflow, blowout and the like occur at the well bottom, and can effectively prevent the occurrence of drilling accidents caused by blowout.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the present invention by any modifications or partial substitutions.
Claims (9)
1. A kind of double-deck pipe well drilling three channels of DH integrative blowout preventer, this blowout preventer is made up of inner plugging device and outer empty packer of ring, the inner plugging device is made up of inner pipe plugging mechanism and annular plugging mechanism; the outer annular packer is arranged on the upper part of the inner plugging device through a short circuit; the inner pipe plugging mechanism and the annular plugging mechanism of the blowout preventer comprise a sliding sleeve inner pipe (7), a lower inner pipe (5), a reset spring (14), a one-way tooth-shaped sleeve (6), a shearing pin I (15), a torsion spring (9-1), a pin shaft (9-2), a valve plate (11), a pin (13), an annular plugging sliding sleeve (8), a valve seat (9) and an inner pipe lower joint (10), wherein the one-way tooth-shaped sleeve (6) is arranged at the upper end of the sliding sleeve inner pipe (7) through the shearing pin I (15), the sliding sleeve inner pipe (7) is positioned by a step (603), a tooth-shaped step (602) on the surface of the one-way tooth-shaped sleeve (6) is matched with a tooth-shaped step (505) inside the lower inner pipe (5), a shearing pin protective sleeve I (15-1) is arranged outside the shearing pin I (15) and is arranged in a shearing pin hole through interference fit, the reset spring (14) is arranged between the sliding sleeve inner pipe (7) and the lower inner pipe (5), the inner tube (7) of the sliding sleeve is connected with the annular blocking sliding sleeve (8) through a bolt (13), a corresponding key slot opening (502) is formed in the lower inner tube (5), the key slot opening (502) limits the moving range of the bolt (13), a stepped sealing surface (803) at the upper part of the annular blocking sliding sleeve (8) is matched with a stepped limiting shaft shoulder (1702) in the lower outer tube (17), a centralizing block I (12) and a centralizing block II (16) are arranged between the lower inner tube (5) and the lower outer tube (17), the centralizing block I (12) is positioned through a positioning shaft shoulder III (1701), and the centralizing block II (16) is positioned through a positioning shaft shoulder IV (1703); the valve seat (9) is installed at the lower part of the lower inner pipe (5) through threads, and the valve plate (11) and the torsion spring (9-1) are installed on the valve seat (9) through a pin shaft (9-2); the outer annular packer of the blowout preventer comprises an inner pipe short joint (4), an upper inner pipe (3), an upper inner sliding sleeve (2), an inner pipe upper joint (1), an outer pipe short joint (18), an upper outer pipe (23), an upper outer sliding sleeve (25), an outer pipe upper joint (27), a lock catch (21), a lock catch seat (19) and a rubber sleeve (20); the inner pipe short joint (4) is connected with the lower inner pipe (5) through threads, the inner pipe short joint (4) is connected with the upper inner pipe (3) through threads, the upper inner pipe (3) is connected with the upper inner sliding sleeve (2) through shearing pins III (24) which are uniformly distributed along the circumferential direction, a shearing pin protective sleeve III (24-1) is arranged outside the shearing pin III (24) and is arranged in a shearing pin hole through interference fit, the upper inner sliding sleeve (2) is connected with the upper connector (1) of the inner pipe through threads, the outer pipe short joint (18) is connected with the lower outer pipe (17) through threads, the outer pipe short joint (18) is connected with the upper outer pipe (23) through threads, the upper outer pipe (23) is connected with the upper outer sliding sleeve (25) through pins which are uniformly distributed along the circumferential direction and are the same as the shearing pins III (24), a protective sleeve which is the same as the shearing pin protective sleeve III (24-1) is arranged outside the pin which is the same as the shearing pin protective sleeve III (24) and is arranged in the shearing pin protective sleeve III (24-1) and is arranged in the shearing pin hole through interference fit, the upper outer sliding sleeve (25) is connected with an upper connector (27) of the outer pipe through threads, the lock catch (21) is connected with the upper outer sliding sleeve (25) through shearing pins II (22) which are uniformly distributed in the circumferential direction, a shearing pin protective sleeve II (22-1) is arranged outside the shearing pins II (22) and is arranged in a shearing pin hole in an interference fit mode, the lock catch seat (19) is arranged at the lower part of the upper outer pipe (23) through threads, the rubber barrel (20) is arranged on the outer pipe short joint (18), and the lower part of the upper outer sliding sleeve (25) is in contact with and fixed with the rubber barrel (20); a righting block III (26) is arranged between the inner pipe upper joint (1) and the outer pipe upper joint (27), and the righting block III (26) is positioned through a positioning shaft shoulder V (2702).
2. The dual-pipe drilling downhole three-channel integrated blowout preventer of claim 1, wherein: the lower inner pipe (5) is provided with a key notch (502), an internal thread IV (501) connected with the valve seat (9), a positioning shaft shoulder I (503) for positioning the righting block II (16), an external thread III (504) connected with the inner pipe short joint (4) and a tooth-shaped step (505) for locking the one-way tooth-shaped sleeve (6).
3. The dual-pipe drilling downhole three-channel integrated blowout preventer of claim 1, wherein: the sliding sleeve inner pipe (7) is provided with a gourd string cavity (703), a bolt hole I (701) for installing a bolt (13), a pin hole (702) for installing a shearing pin I (15) and a reducing surface I (704).
4. The dual-pipe drilling downhole three-channel integrated blowout preventer of claim 1, wherein: the one-way tooth-shaped sleeve (6) is provided with a step (603) for positioning the inner tube (7) of the sliding sleeve, a pin hole (601) for mounting the shearing pin I (15), and a tooth-shaped step (602) matched with the tooth-shaped step (505).
5. The dual-pipe drilling downhole three-channel integrated blowout preventer of claim 1, wherein: the valve seat (9) is provided with an external thread V (903) connected with the lower inner pipe (5), an external thread IV (902) connected with the lower joint (10) of the inner pipe and a pin shaft hole (901) for mounting a pin shaft (9-2); the valve plate (11) and the torsion spring (9-1) are both arranged on the valve seat (9) through the pin shaft (9-2), and the valve plate (11) is in a normally closed state due to the existence of the torsion spring (9-1).
6. The dual-pipe drilling downhole three-channel integrated blowout preventer of claim 1, wherein: the annular sealing sliding sleeve (8) is provided with an annular sealing ring groove (802), a stepped sealing surface (803), a bolt hole II (801) for installing a bolt (13) and a reducing surface II (804).
7. The dual-tube drilling downhole three-channel integrated blowout preventer according to claim 1, wherein: the lower outer pipe (17) is provided with a positioning shaft shoulder III (1701) for positioning the centralizing block I (12), a positioning shaft shoulder IV (1703) for positioning the centralizing block II (16), and a stepped limiting shaft shoulder (1702) matched with a stepped sealing surface (803) on the upper part of the annular sealing sliding sleeve (8).
8. The dual-tube drilling downhole three-channel integrated blowout preventer according to claim 1, wherein: the upper outer sliding sleeve (25) is provided with an internal thread VIII (2503), a pin hole I (2501) and a pin hole II (2502) which are connected with the outer tube upper joint (27).
9. The dual-pipe drilling downhole three-channel integrated blowout preventer of claim 1, wherein: the lock catch (21) is provided with a pin hole (2201) for mounting a shearing pin II (22), the lock catch (21) is of an annular six-equal-division structure, and the lower portion of the lock catch is provided with a trapezoidal inclined plane II (2102) which is conveniently buckled with a trapezoidal inclined plane I (1902) of the lock catch seat (19) step by step.
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| CN202111211069.5A CN113863888B (en) | 2021-10-18 | 2021-10-18 | Underground three-channel integrated blowout preventer for double-tube drilling |
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| CN202111211069.5A CN113863888B (en) | 2021-10-18 | 2021-10-18 | Underground three-channel integrated blowout preventer for double-tube drilling |
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| CN113863888B true CN113863888B (en) | 2022-06-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115628021A (en) * | 2022-10-28 | 2023-01-20 | 西南石油大学 | Along with boring shaft bottom sand removal instrument |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3131765A (en) * | 1962-04-13 | 1964-05-05 | Baker Oil Tools Inc | Convertible well packer and bridge plug |
| CN101718182A (en) * | 2009-12-29 | 2010-06-02 | 西南石油大学 | Ball valve type inside and outside integrative downhole blow-out preventer |
| CN101718181A (en) * | 2009-12-29 | 2010-06-02 | 西南石油大学 | Lifting valve type underground inside-outside integrated blowout preventer |
| CN101812981A (en) * | 2010-04-17 | 2010-08-25 | 西南石油大学 | Mechanical underground all-in-one blowout preventer |
| CN103306634A (en) * | 2012-03-09 | 2013-09-18 | 中国石油化工股份有限公司 | Sliding-sleeve-type downhole blow-out preventer and application thereof |
| CN204386552U (en) * | 2015-01-08 | 2015-06-10 | 陕西创源石油科技有限公司 | The manual blowout preventer pressure-testing packer in a kind of down-hole |
| CN104747117A (en) * | 2013-12-25 | 2015-07-01 | 中国石油化工股份有限公司 | Underground blowout prevention device |
| CN205172492U (en) * | 2015-12-15 | 2016-04-20 | 中国石油天然气股份有限公司 | Exempt from to give up and prevent spouting anchoring integration tubular column |
| CN105927179A (en) * | 2016-05-06 | 2016-09-07 | 西南石油大学 | Pressing expansion type downhole annular blowout preventer and communication method thereof |
| CN108979582A (en) * | 2018-08-31 | 2018-12-11 | 四川昆仑石油设备制造有限公司 | One kind is with brill blowout hookup |
| CN110593777A (en) * | 2019-10-08 | 2019-12-20 | 西南石油大学 | Double-gradient drilling string disconnecting and tieback device without marine riser |
| CN111456681A (en) * | 2020-06-08 | 2020-07-28 | 西南石油大学 | Double-layer in-pipe blowout prevention valve |
| CN111779464A (en) * | 2020-08-31 | 2020-10-16 | 西南石油大学 | Double-layer pipe double-gradient pressure control drilling underground blowout preventer |
| CN113107436A (en) * | 2021-04-29 | 2021-07-13 | 南方海洋科学与工程广东省实验室(湛江) | Underground self-locking safety valve for deep-sea natural gas hydrate double-layer pipe exploitation |
| CN113445962A (en) * | 2021-06-24 | 2021-09-28 | 西南石油大学 | Hydraulic double-layer pipe double-gradient downhole blowout prevention valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235158B (en) * | 2011-05-26 | 2015-05-20 | 西南石油大学 | Underground annular blowout preventer and assembly process thereof |
| CN104314506B (en) * | 2014-10-10 | 2017-05-24 | 长江大学 | Electric-control compression type downhole blow-out preventer |
-
2021
- 2021-10-18 CN CN202111211069.5A patent/CN113863888B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3131765A (en) * | 1962-04-13 | 1964-05-05 | Baker Oil Tools Inc | Convertible well packer and bridge plug |
| CN101718182A (en) * | 2009-12-29 | 2010-06-02 | 西南石油大学 | Ball valve type inside and outside integrative downhole blow-out preventer |
| CN101718181A (en) * | 2009-12-29 | 2010-06-02 | 西南石油大学 | Lifting valve type underground inside-outside integrated blowout preventer |
| CN101812981A (en) * | 2010-04-17 | 2010-08-25 | 西南石油大学 | Mechanical underground all-in-one blowout preventer |
| CN103306634A (en) * | 2012-03-09 | 2013-09-18 | 中国石油化工股份有限公司 | Sliding-sleeve-type downhole blow-out preventer and application thereof |
| CN104747117A (en) * | 2013-12-25 | 2015-07-01 | 中国石油化工股份有限公司 | Underground blowout prevention device |
| CN204386552U (en) * | 2015-01-08 | 2015-06-10 | 陕西创源石油科技有限公司 | The manual blowout preventer pressure-testing packer in a kind of down-hole |
| CN205172492U (en) * | 2015-12-15 | 2016-04-20 | 中国石油天然气股份有限公司 | Exempt from to give up and prevent spouting anchoring integration tubular column |
| CN105927179A (en) * | 2016-05-06 | 2016-09-07 | 西南石油大学 | Pressing expansion type downhole annular blowout preventer and communication method thereof |
| CN108979582A (en) * | 2018-08-31 | 2018-12-11 | 四川昆仑石油设备制造有限公司 | One kind is with brill blowout hookup |
| CN110593777A (en) * | 2019-10-08 | 2019-12-20 | 西南石油大学 | Double-gradient drilling string disconnecting and tieback device without marine riser |
| CN111456681A (en) * | 2020-06-08 | 2020-07-28 | 西南石油大学 | Double-layer in-pipe blowout prevention valve |
| CN111779464A (en) * | 2020-08-31 | 2020-10-16 | 西南石油大学 | Double-layer pipe double-gradient pressure control drilling underground blowout preventer |
| CN113107436A (en) * | 2021-04-29 | 2021-07-13 | 南方海洋科学与工程广东省实验室(湛江) | Underground self-locking safety valve for deep-sea natural gas hydrate double-layer pipe exploitation |
| CN113445962A (en) * | 2021-06-24 | 2021-09-28 | 西南石油大学 | Hydraulic double-layer pipe double-gradient downhole blowout prevention valve |
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| CN113863888A (en) | 2021-12-31 |
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