CN109441399B - Bridge plug capable of flushing sand - Google Patents
Bridge plug capable of flushing sand Download PDFInfo
- Publication number
- CN109441399B CN109441399B CN201811523524.3A CN201811523524A CN109441399B CN 109441399 B CN109441399 B CN 109441399B CN 201811523524 A CN201811523524 A CN 201811523524A CN 109441399 B CN109441399 B CN 109441399B
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- China
- Prior art keywords
- ring
- central tube
- joint
- sand washing
- locking
- Prior art date
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- 239000004576 sand Substances 0.000 title claims abstract description 55
- 238000011010 flushing procedure Methods 0.000 title claims description 10
- 238000005406 washing Methods 0.000 claims abstract description 39
- 210000001503 joint Anatomy 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 10
- 238000007789 sealing Methods 0.000 abstract description 6
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
Abstract
The invention discloses a sand-washable bridge plug, and belongs to the technical field of oilfield exploitation. The device comprises an upper joint, an upper central tube, a middle central tube and a lower central tube which are sequentially connected in a threaded manner from top to bottom; the inner side of the lower end of the lower central tube is in threaded connection with a ball seat, the lower end of the ball seat is in threaded connection with a cannula, and the lower end of the cannula is provided with a self-locking head; a switch sliding sleeve is arranged in the adapter, a positioning self-locking switch is arranged at the upper end of the switch sliding sleeve, and a first sand washing channel is arranged on the switch sliding sleeve and the middle joint; the middle joint is externally connected with a sand washing jacket in a threaded manner, the lower end of the sand washing jacket is connected with a bevel-mouth guide shoe in a threaded manner, and a second sand washing channel is arranged in the bevel-mouth guide shoe. In summary, the invention realizes the isolation of the stratum through one pipe column without putting in a special sand washing tool; the bridge plug adopts a two-stage piston and three-group rubber cylinder structure, so that the setting is reliable and the success rate is high; the switch sliding sleeve is reliable in sealing, can bear bidirectional pressure difference, is high in bearing pressure, simplifies operation procedures, improves construction cost rate, and reduces operation risks.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a sand-flushable bridge plug.
Background
Along with development progress of oil fields, most of the oil fields in China enter the middle and later stages of oil field development, sand discharge of an oil-water well is a common phenomenon, sand discharge is serious, sand cannot be completely flushed out in conventional sand flushing operation, tools cannot be put in place in construction operation again, a clamping pipe column is caused, and great construction risks are caused for construction operation. The conventional sand washing industry mainly comprises the steps of putting a special sand washing pipe column into the sand washing industry to perform sand washing operation, putting a bridge plug into the sand washing industry after sand washing is completed to seal and isolate a target layer, wherein the operation process is long in construction period and high in operation risk, and cannot be suitable for a serious well with special sand discharge.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the sand-washable bridge plug, which can wash sand while being lowered when the sand-washable bridge plug is lowered into an oil-gas well with serious sand production, so that the bridge plug is ensured to be lowered in place smoothly, the formation is effectively sealed, the construction process is simplified, the construction period is shortened, and the operation cost is saved.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a sand-flushing bridge plug which comprises an upper joint, an upper central pipe, a middle central pipe and a lower central pipe which are sequentially connected in a threaded manner from top to bottom; the outer side of the lower end of the lower central tube is connected with a shearing ring in a threaded manner, and the outer side of the lower end of the shearing ring is connected with a central tube in a threaded manner; the inner side of the lower end of the lower central tube is in threaded connection with a ball seat, the lower end of the ball seat is in threaded connection with an insertion tube, and the lower end of the insertion tube is provided with a self-locking head;
the lower end of the central tube is in threaded connection with a lower cone, the inner side of the lower end of the lower cone is in threaded connection with a lower joint, the lower end of the lower joint is in threaded connection with an adapter, the outer side of the lower end of the adapter is in threaded connection with an intermediate joint, and a self-locking release groove is formed after the adapter is in threaded connection with the intermediate joint;
the self-locking type sand washing device is characterized in that a switch sliding sleeve is arranged in the adapter, a positioning self-locking switch is arranged at the upper end of the switch sliding sleeve, first sand washing channels are formed in the switch sliding sleeve and the middle joint, and the self-locking head is inserted into the positioning self-locking switch and is in a locking state, and at the moment, the first sand washing channels are opened;
the middle joint is externally connected with a sand washing coat in a threaded manner, the lower end of the sand washing coat is connected with a bevel-mouth guide shoe in a threaded manner, and a second sand washing channel is formed in the bevel-mouth guide shoe.
Further, the upper end of the middle central tube is sleeved with an upper piston; an upper liquid inlet hole is formed in the contact part of the middle central tube and the upper piston; the upper end of the lower central tube is sleeved with a lower piston, and a lower liquid inlet hole is formed in the contact part between the upper end of the lower central tube and the lower piston.
Further, the lower center tube lower extreme cover is equipped with the pressure release ring, the lower center tube lower extreme is equipped with first pressure release hole, the pressure release ring upper end is equipped with the second pressure release hole, works as when the pressure release ring moves down, second pressure release hole and first pressure release hole intercommunication.
Further, an upper baffle ring is arranged on the outer side of the upper joint, a back cap is sleeved on the outer side of the upper joint, and the back cap is connected with a hydraulic cylinder;
the outer part of the upper end of the central tube is provided with sawtooth threads, the outer part of the central tube is sleeved with a sleeve, the upper end of the sleeve is connected with a sheath, the sheath is used for limiting, and the upper end of the sheath is in threaded connection with the outer side of the lower end of the compression ring;
the lower end of the hydraulic cylinder is in contact with the pressing ring, and when the hydraulic cylinder is forced to move downwards, the pressing ring is pushed to move downwards together;
the upper central tube, the upper piston, the middle central tube, the lower piston and the lower central tube are arranged in the hydraulic cylinder, and the movement of the hydraulic cylinder is pushed by the movement of the upper piston and the lower piston.
Further, a deblocking connector is arranged inside the pressing ring, the lower end of the deblocking connector is in contact with the central tube, a locking ring is sleeved outside the deblocking connector, the locking ring is arranged between the pressing ring and the sheath, and the locking ring is arranged at the contact part of the deblocking connector and the central tube.
Further, the lower end of the sleeve is connected with an upper cone in a threaded manner, a plurality of rubber barrels are arranged on the outer side of the sleeve, a spacing ring is arranged between two adjacent rubber barrels, and copper covers are arranged on the outer sides of the rubber barrels and the spacing ring;
the outer cover of the lower end of the central pipe is provided with a slip, a spring piece and a slip cover, the upper end of the slip cover is arranged on the outer surface of the upper cone, the outer surface of the lower cone is provided with an inner protective cap, the lower end of the slip cover is in threaded connection with the inner protective cap, and the slip and the spring piece are arranged inside the slip cover.
Furthermore, the lower end of the middle joint is connected with a blind plug in a threaded manner, and the outer thread of the lower end of the lower cone is connected with a baffle ring.
Preferably, a first O-ring is arranged at the contact position of the upper central tube and the upper joint, a second O-ring is arranged at the contact position of the upper central tube and the hydraulic cylinder, a third O-ring is arranged at the contact position of the upper central tube and the middle central tube, a fourth O-ring is arranged at the contact position of the middle central tube and the hydraulic cylinder, a fifth O-ring is arranged at the contact position of the conversion joint and the insertion tube, a sixth O-ring is arranged at the contact position of the conversion joint and the middle joint, a seventh O-ring is arranged at the contact position of the middle joint and the switch sliding sleeve, and an eighth O-ring is arranged at the contact position of the middle joint and the blind plug.
Compared with the prior art, the invention has the following beneficial effects:
the invention is connected to the lower end of an oil pipe, is conveyed by the oil pipe and is lowered to a design position of an oil-gas well, sand resistance is encountered in the lowering process, sand liquid enters a first sand washing channel through a sleeve back flushing well, enters the oil pipe through the inside of a cannula after entering the first sand washing channel, then returns to the ground through the oil pipe, and is lowered to the design position while being washed. The packing of stratum is realized by one pipe column without putting in special sand washing tool.
After the sand flushing bridge plug is lowered to a designed position, a wellhead is fixed, a setting steel ball is put into an oil pipe, the setting steel ball is set on a ball seat, the oil pipe is pressed to be larger than 5MPa, hydraulic pressure enters the upper central pipe, the middle central pipe and the lower central pipe through an upper joint, liquid pushes an upper piston and a lower piston through an upper liquid inlet hole and a lower liquid inlet hole, the upper piston and the lower piston push a hydraulic cylinder, the hydraulic cylinder pushes a compression ring, the compression ring pushes a sheath and then drives a lock ring to move down, the lock ring and the central pipe realize unidirectional locking through unidirectional sawtooth threads, the sheath pushes a copper cover, a rubber cylinder and a spacer ring drive an upper cone to push a slip, the outer parts of the rubber cylinder and the slip are limited through a sleeve, a spring piece is arranged between the slip and the slip cover, and after the slip is anchored on a sleeve wall, the sheath pushes and extrudes the copper cover, the rubber cylinder and the spacer ring, and the rubber cylinder is sealed on the sleeve wall in an expanding manner, so that the annular seal is realized. The bridge plug adopts a two-stage piston and three-group rubber cylinder structure, and has reliable setting and high success rate.
After continuously pressing to be more than 12MPa, the bridge plug is fully set, the shearing ring is sheared, releasing is realized, the lower piston continuously descends under hydraulic pressure to push the release ring to descend, liquid in the oil pipe enters the sleeve through the second release hole and the first release hole, the oil pipe column is lifted up, the pipe column drives the insertion pipe to ascend, the insertion pipe drives the switch sliding sleeve to ascend, the first sand washing channel is closed, meanwhile, the positioning self-locking switch of the switch sliding sleeve automatically unlocks when reaching the self-locking release groove at the lower end of the adapter, the lower end of the insertion pipe is separated from the self-positioning self-locking switch of the lock head, then the pipe column is lifted up continuously to lift the releasing part, and the construction is finished.
The invention has simple process and convenient construction, shortens the construction period and reduces the construction cost; the packing of the stratum is realized by one pipe column without putting in a special sand washing tool; the bridge plug adopts a two-stage piston and three-group rubber cylinder structure, so that the setting is reliable and the success rate is high; the switch sliding sleeve is reliable in sealing, can bear bidirectional pressure difference, is high in bearing pressure, simplifies operation procedures, improves construction cost rate, and reduces operation risks.
Drawings
FIG. 1 is a schematic diagram of a sand-flushable bridge plug according to the present invention;
FIG. 2 is a partial enlarged view of the one-way serrated threads of the center tube of section A and a partial enlarged view of the one-way serrated threads of the locking ring of FIG. 1;
FIG. 3 is a cross-sectional view of a switch sleeve of the present invention;
figure 4 is a schematic illustration of the assembly of the center tube and the unsealing end of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a sand-flushing bridge plug, which is shown in fig. 1-3, and comprises an upper joint 1, an upper central tube 5, a middle central tube 10 and a lower central tube 15 which are sequentially connected in a threaded manner from top to bottom; the outer side of the lower end of the lower central tube 15 is in threaded connection with a shear ring 22, and the outer side of the lower end of the shear ring 22 is in threaded connection with a central tube 23; the inner side of the lower end of the lower central tube 15 is in threaded connection with a ball seat 19, the lower end of the ball seat 19 is in threaded connection with a cannula 24, and the lower end of the cannula 24 is provided with a self-locking head 53;
the lower end of the central tube 23 is in threaded connection with a lower cone 32, the inner side of the lower end of the lower cone 32 is in threaded connection with a lower joint 35, the lower end of the lower joint 35 is in threaded connection with an adapter 36, the outer side of the lower end of the adapter 36 is in threaded connection with the upper end of an intermediate joint 39, and after the adapter 36 is in threaded connection with the intermediate joint 39, a self-locking release groove 52 is formed among the adapter 36, the intermediate joint 39 and the self-locking head 53;
the inside of the adapter 36 is provided with a switch sliding sleeve 41, the upper end of the switch sliding sleeve 41 is provided with a positioning self-locking switch 40, the switch sliding sleeve 41 and the middle joint 39 are respectively provided with a first sand washing channel 43, and the self-locking head 53 is inserted into the positioning self-locking switch 40 and is in a locking state, and at the moment, the first sand washing channel 43 is opened;
the middle joint 39 is externally connected with a sand washing jacket 46 in a threaded manner, the lower end of the sand washing jacket 46 is connected with a bevel-mouth guide shoe 47 in a threaded manner, and a second sand washing channel 48 is arranged in the bevel-mouth guide shoe 47.
The invention is connected to the lower end of an oil pipe, is conveyed by the oil pipe and is lowered to a design position of an oil-gas well, sand resistance is encountered in the lowering process, sand liquid enters a first sand washing channel through a sleeve back flushing well, enters the oil pipe through the inside of a cannula after entering the first sand washing channel, then returns to the ground through the oil pipe, and is lowered to the design position while being washed. The packing of stratum is realized by one pipe column without putting in special sand washing tool.
Further, the upper end of the middle central tube 10 is sleeved with an upper piston 9; an upper liquid inlet hole 7 is formed in the contact part of the middle central tube 10 and the upper piston 9; the upper end of the lower central tube 15 is sleeved with a lower piston 14, and a lower liquid inlet hole 13 is formed in the contact part between the upper end of the lower central tube 15 and the lower piston 14.
Further, the lower end of the lower central tube 15 is sleeved with a pressure release ring 16, the lower end of the lower central tube 15 is provided with a first pressure release hole 18, the upper end of the pressure release ring 16 is provided with a second pressure release hole 17, and when the pressure release ring 16 moves downwards, the second pressure release hole 17 is communicated with the first pressure release hole 18.
Further, an upper baffle ring 2 is arranged on the outer side of the upper joint 1, the upper joint 1 is sleeved with a spare cap 3, and the spare cap 3 is connected with a hydraulic cylinder 11;
the outside of the upper end of the central tube 23 is provided with sawtooth threads 888, the outside of the central tube 23 is sleeved with a sleeve 28, the upper end of the sleeve 28 is connected with a sheath 50, the top of the sleeve 28 is outwards turned to form a sleeve edge, the sleeve edge of the sleeve 28 is positioned in the sheath 50, the rest positions of the sleeve 28 are positioned outside the sheath 50, the limiting of the sleeve 28 is realized through the sleeve edge, and the upper end of the sheath 50 is in threaded connection with the outer side of the lower end of the compression ring 49;
the lower end of the hydraulic cylinder 11 is contacted with the pressing ring 49, and when the hydraulic cylinder 11 is forced to move downwards, the pressing ring 49 is pushed to move downwards together;
the upper central tube 5, the upper piston 9, the middle central tube 10, the lower piston 14 and the lower central tube 15 are arranged in the hydraulic cylinder 11, and the hydraulic cylinder 11 is driven to move by the movement of the upper piston 9 and the lower piston 14.
Further, a unsealing head 20 is arranged inside the pressure ring 49, a claw is arranged at the lower end of the unsealing head 20 and is clamped with a clamping groove at the upper end of the central tube 23, a lock ring 21 is sleeved outside the unsealing head 20, sawtooth threads 999 are arranged inside the lock ring 21 and are matched with sawtooth threads 888 outside the central tube 23 for use, the lock ring 21 is disconnected laterally, and the lock ring 21 is arranged between the pressure ring 49 and the sheath 50.
Further, an upper cone 29 is connected with the lower end of the sleeve 28 in a threaded manner, a plurality of rubber barrels 26 are arranged on the outer side of the sleeve 28, a spacing ring 27 is arranged between every two adjacent rubber barrels 26, and a copper cover 25 is arranged on the outer sides of the rubber barrels 26 and the spacing ring 27;
the outer side of the lower end of the central pipe 23 is sleeved with a slip 31, a spring piece 30 and a slip cover 51, the upper end of the slip cover 51 is arranged on the outer surface of the upper cone 29, the outer surface of the lower cone 32 is provided with an inner protective cap 33, the lower end of the slip cover 51 is in threaded connection with the inner protective cap 33, and the slip 31 and the spring piece 30 are arranged inside the slip cover 51. The spring piece 30 is arranged between the slips 31 and the slip cover 51, in the setting process, the downward thrust of the hydraulic cylinder 11 is simultaneously transmitted to the slips 31 and the rubber sleeve 26, and after the slips 31 are anchored on the casing wall, the rubber sleeve 26 is pushed to be sealed on the casing wall in an expanding mode, and annular sealing is achieved.
After the sand flushing bridge plug is lowered to a designed position, a wellhead is fixed, a setting steel ball is put into an oil pipe, the setting steel ball is set on a ball seat, the oil pipe is pressed to be larger than 5MPa, hydraulic pressure enters the upper central pipe, the middle central pipe and the lower central pipe through an upper joint, liquid pushes an upper piston and a lower piston through an upper liquid inlet hole and a lower liquid inlet hole, the upper piston and the lower piston push a hydraulic cylinder, the hydraulic cylinder pushes a compression ring, the compression ring pushes a sheath and then drives a lock ring to move down, the lock ring and the central pipe realize unidirectional locking through unidirectional sawtooth threads, the sheath pushes a copper cover, a rubber cylinder and a spacer ring drive an upper cone to push a slip, the outer parts of the rubber cylinder and the slip are limited through a sleeve, a spring piece is arranged between the slip and the slip cover, and after the slip is anchored on a sleeve wall, the sheath pushes and extrudes the copper cover, the rubber cylinder and the spacer ring, and the rubber cylinder is sealed on the sleeve wall in an expanding manner, so that the annular seal is realized. The bridge plug adopts a two-stage piston and three-group rubber cylinder structure, and has reliable setting and high success rate.
After continuously pressing to be more than 12MPa, the bridge plug is fully set, the shearing ring is sheared, releasing is realized, the lower piston continuously descends under hydraulic pressure to push the release ring to descend, liquid in the oil pipe enters the sleeve through the second release hole and the first release hole, the oil pipe column is lifted up, the pipe column drives the insertion pipe to ascend, the insertion pipe drives the switch sliding sleeve to ascend, the first sand washing channel is closed, meanwhile, the positioning self-locking switch of the switch sliding sleeve automatically unlocks when reaching the self-locking release groove at the lower end of the adapter, the lower end of the insertion pipe is separated from the self-positioning self-locking switch of the lock head, then the pipe column is lifted up continuously to lift the releasing part, and the construction is finished. The switch sliding sleeve is reliable in sealing, can bear bidirectional pressure difference, is high in bearing pressure, simplifies operation procedures, improves construction cost rate, and reduces operation risks.
Further, the lower end of the middle joint 39 is connected with a blind plug 45 in a threaded manner, after the bridge plug requires setting and releasing, the tool cannot be provided with a communication channel up and down, and the blind plug 45 can be used for plugging the inner cavity. The lower cone 32 is externally threaded at its lower end with a stop ring 34.
The upper and 2 stop rings 34 are the largest diameter portions of the product to protect the packing element and slips from the well wall during the run.
Preferably, a first O-shaped ring 4 is arranged at the contact position of the upper central tube 5 and the upper joint 1, a second O-shaped ring 6 is arranged at the contact position of the upper central tube 5 and the hydraulic cylinder 11, a third O-shaped ring 8 is arranged at the contact position of the upper central tube 5 and the middle central tube 10, a fourth O-shaped ring 12 is arranged at the contact position of the middle central tube 10 and the hydraulic cylinder 11, a fifth O-shaped ring 37 is arranged at the contact position of the conversion joint 36 and the insertion tube 24, a sixth O-shaped ring 38 is arranged at the contact position of the conversion joint 36 and the middle joint 39, a seventh O-shaped ring 42 is arranged at the contact position of the middle joint 39 and the switch sliding sleeve 41, and an eighth O-shaped ring 44 is arranged at the contact position of the middle joint 39 and the blind plug 45, so that the sealing of the device is realized.
In summary, the invention realizes the isolation of the stratum through one pipe column without putting in a special sand washing tool; the bridge plug adopts a two-stage piston and three-group rubber cylinder structure, so that the setting is reliable and the success rate is high; the switch sliding sleeve is reliable in sealing, can bear bidirectional pressure difference, is high in bearing pressure, simplifies operation procedures, improves construction cost rate, and reduces operation risks.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (4)
1. The sand flushing bridge plug is characterized by comprising an upper joint, an upper central pipe, a middle central pipe and a lower central pipe which are connected in sequence in a threaded manner from top to bottom; the outer side of the lower end of the lower central tube is connected with a shearing ring in a threaded manner, and the outer side of the lower end of the shearing ring is connected with a central tube in a threaded manner; the inner side of the lower end of the lower central tube is in threaded connection with a ball seat, the lower end of the ball seat is in threaded connection with an insertion tube, and the lower end of the insertion tube is provided with a self-locking head; the lower end of the central tube is in threaded connection with a lower cone, the inner side of the lower end of the lower cone is in threaded connection with a lower joint, the lower end of the lower joint is in threaded connection with an adapter, the outer side of the lower end of the adapter is in threaded connection with an intermediate joint, and a self-locking release groove is formed after the adapter is in threaded connection with the intermediate joint; the self-locking type sand washing device is characterized in that a switch sliding sleeve is arranged in the adapter, a positioning self-locking switch is arranged at the upper end of the switch sliding sleeve, first sand washing channels are formed in the switch sliding sleeve and the middle joint, and the self-locking head is inserted into the positioning self-locking switch and is in a locking state, and at the moment, the first sand washing channels are opened; the outer thread of the middle joint is connected with a sand washing jacket, the lower end of the sand washing jacket is connected with a bevel-mouth guide shoe in a thread manner, and a second sand washing channel is arranged in the bevel-mouth guide shoe;
an upper piston is sleeved at the upper end of the middle central tube; an upper liquid inlet hole is formed in the contact part of the middle central tube and the upper piston; the upper end of the lower central tube is sleeved with a lower piston, and a lower liquid inlet hole is formed in the contact part between the upper end of the lower central tube and the lower piston; an upper baffle ring is arranged on the outer side of the upper joint, a back cap is sleeved on the outer side of the upper joint, and the back cap is connected with a hydraulic cylinder; the outer part of the upper end of the central tube is provided with sawtooth threads, the outer part of the central tube is sleeved with a sleeve, the upper end of the sleeve is connected with a sheath, the sheath is used for limiting, and the upper end of the sheath is in threaded connection with the outer side of the lower end of the compression ring;
the lower end of the hydraulic cylinder is in contact with the pressing ring, and when the hydraulic cylinder is forced to move downwards, the pressing ring is pushed to move downwards together; the upper central tube, the upper piston, the middle central tube, the lower piston and the lower central tube are arranged in the hydraulic cylinder, and the movement of the hydraulic cylinder is pushed by the movement of the upper piston and the lower piston; the inner part of the pressure ring is provided with a deblocking connector, the lower end of the deblocking connector is clamped with the central pipe, a locking ring is sleeved outside the deblocking connector, the locking ring is arranged between the pressure ring and the sheath, and the locking ring is arranged at the contact parts of the deblocking connector and the central pipe;
the lower end of the sleeve is connected with an upper cone in a threaded manner, a plurality of rubber barrels are arranged on the outer side of the sleeve, a spacing ring is arranged between every two adjacent rubber barrels, and copper covers are arranged on the outer sides of the rubber barrels and the spacing ring; the outer cover of the lower end of the central pipe is provided with a slip, a spring piece and a slip cover, the upper end of the slip cover is arranged on the outer surface of the upper cone, the outer surface of the lower cone is provided with an inner protective cap, the lower end of the slip cover is in threaded connection with the inner protective cap, and the slip and the spring piece are arranged inside the slip cover.
2. The sand washing bridge plug according to claim 1, wherein the lower end of the lower central tube is sleeved with a pressure release ring, the lower end of the lower central tube is provided with a first pressure release hole, the upper end of the pressure release ring is provided with a second pressure release hole, and when the pressure release ring moves downwards, the second pressure release hole is communicated with the first pressure release hole.
3. The sand-washable bridge plug of claim 2, wherein the middle joint lower end is threaded with a blind plug and the lower cone lower end is externally threaded with a baffle ring.
4. The sand-washable bridge plug of claim 3, wherein a first O-ring is disposed at a location where the upper center tube contacts the upper connector, a second O-ring is disposed at a location where the upper center tube contacts the hydraulic cylinder, a third O-ring is disposed at a location where the upper center tube contacts the intermediate center tube, a fourth O-ring is disposed at a location where the intermediate center tube contacts the hydraulic cylinder, a fifth O-ring is disposed at a location where the adapter contacts the cannula, a sixth O-ring is disposed at a location where the adapter contacts the intermediate connector, a seventh O-ring is disposed at a location where the intermediate connector contacts the switch slide, and an eighth O-ring is disposed at a location where the intermediate connector contacts the blind plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811523524.3A CN109441399B (en) | 2018-12-13 | 2018-12-13 | Bridge plug capable of flushing sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811523524.3A CN109441399B (en) | 2018-12-13 | 2018-12-13 | Bridge plug capable of flushing sand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109441399A CN109441399A (en) | 2019-03-08 |
| CN109441399B true CN109441399B (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811523524.3A Active CN109441399B (en) | 2018-12-13 | 2018-12-13 | Bridge plug capable of flushing sand |
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| Country | Link |
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| CN (1) | CN109441399B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927382B (en) * | 2020-08-07 | 2022-04-29 | 中国石油大学(北京) | Packer (CN) |
| CN114737941A (en) * | 2022-05-27 | 2022-07-12 | 中国石油化工股份有限公司 | Staged fracturing construction method for long well section |
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| CN204060616U (en) * | 2014-07-25 | 2014-12-31 | 中国石油天然气股份有限公司 | A kind of bridging plug instrument of applicable straight well seam net pressure break |
| CN209179726U (en) * | 2018-12-13 | 2019-07-30 | 山东博赛特石油技术有限公司 | One kind can sand washing bridge plug |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2835545Y (en) * | 2005-07-04 | 2006-11-08 | 徐建 | Reclaimable bridge plug |
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| US8205671B1 (en) * | 2009-12-04 | 2012-06-26 | Branton Tools L.L.C. | Downhole bridge plug or packer assemblies |
| CN203374238U (en) * | 2013-08-01 | 2014-01-01 | 中国石油化工股份有限公司 | Integrated dust squeezing bridge plug capable of being taken out |
| CN203905896U (en) * | 2014-06-29 | 2014-10-29 | 荆州市赛瑞能源技术有限公司 | Mechanical withdrawable bridge plug |
| CN204060616U (en) * | 2014-07-25 | 2014-12-31 | 中国石油天然气股份有限公司 | A kind of bridging plug instrument of applicable straight well seam net pressure break |
| CN209179726U (en) * | 2018-12-13 | 2019-07-30 | 山东博赛特石油技术有限公司 | One kind can sand washing bridge plug |
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