Recyclable bridge plug

Abstract

The utility model discloses a recoverable bridge plug which comprises a bridge plug body, a pull tube is sleeved on the bridge plug body, a connecting tube, a central tube, a sliding sleeve and a pawl sleeve are sequentially sleeved outside the pull tube, the connecting tube is sleeved with the central tube, and one end of the connecting tube extends to the outer side of the pull tube and then is connected with one end of a first bolt; the outer wall of the part wrapping the sliding sleeve and the central pipe is sleeved with a clamping jaw sleeve, the outer wall of the part wrapping the connecting pipe and the other outer wall of the central pipe is sleeved with a setting sleeve, the outer wall of the part wrapping the clamping jaw sleeve and the outer wall of the part wrapping the setting sleeve are sleeved with a clamping device, and the outer wall of the part wrapping the setting sleeve and the outer wall of the clamping device are sleeved with a sealing device. The other outer walls of the wrapping connecting pipe are sleeved with a driving device, and the driving device is connected with the setting sleeve pipe in a sleeved mode. According to the bridge plug, outward expansion and inward contraction movement of the clamping device and outward diameter expansion and inward diameter contraction movement of the sealing device can be achieved, meanwhile, it is guaranteed that the expansion type clamping device always moves earlier than the diameter expansion type sealing device, and therefore installation and recovery of the bridge plug are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil and gas field tool technical field relates to a recoverable bridge plug. BACKGROUND

[0002] In the development process of oil and gas field, bridge plug is a commonly used downhole tool, and the traditional recoverable bridge plug needs to increase the pressure of the wellbore of the oil and gas field during installation, so that the bridge plug can be set in the wellbore; and the wellbore of the oil well needs to be depressurized during recovery, so that it can be recovered through the fishing device; but the change of the pressure in the wellbore of the oil well will cause the probability of accidents in the development process of the oil and gas field, increase the operation risk, and the conventional bridge plug cannot be quickly taken out after being isolated in the wellbore, and the bridge plug needs to be drilled and ground by a drill rod or a tubing, and then the development and subsequent wellbore operation can be realized, and the wellbore of the oil well usually extends into the deep underground, so that the requirement for the pressurizing equipment is extremely high during the installation of the bridge plug, and the production cost is increased. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a recoverable bridge plug, which solves the problem that the bridge plug cannot be quickly taken out after being isolated in the wellbore in the prior art, and the bridge plug needs to be drilled and ground by a drill rod or a tubing, and then the development and subsequent wellbore operation can be realized.

[0004] The utility model adopts the technical scheme, a recoverable bridge plug, including bridge plug body, the bridge plug body is equipped with pull pipe, pull pipe outside is equipped with connecting pipe, center tube, sliding sleeve, pawl sleeve in proper order, connecting pipe and center tube are connected, and the first bolt one end is connected after connecting pipe one end extends to pull pipe outside side; the outer wall of sliding sleeve and center tube part is equipped with claw sleeve, the outer wall of connecting pipe part and the rest of center tube is equipped with setting sleeve, the outer wall of claw sleeve part and setting sleeve part is equipped with clamping device, the outer wall of setting sleeve part and clamping device part is equipped with sealing device, and the rest of connecting pipe outer wall is equipped with driving device and driving device and setting sleeve are connected.

[0005] The utility model recoverable bridge plug's characteristics still lie in:

[0006] The first inclined plane is arranged on the inner wall bottom of the sliding sleeve, the second inclined plane is arranged on the side opposite to the first inclined plane of the pawl sleeve, and the pawl sleeve is clamped between the pull tube and the sliding sleeve; a plurality of one-way transmission teeth are arranged on the position where the pawl sleeve and the pull tube abut each other in the circumferential direction; the outer wall of the sliding sleeve is fixedly connected to the inner wall of the claw sleeve through a plurality of first breakable pins at the position close to the top; and the outer wall of the center tube is fixedly connected to the inner wall of the claw sleeve through a plurality of pin shafts at the position close to the bottom.

[0007] The first screw sleeve is further arranged outside the pull tube, the top of the first screw sleeve abuts against the bottom of the pawl sleeve, and a part of the first screw sleeve is clamped between the pull tube and the sliding sleeve.

[0008] The bottom of the claw sleeve is fixed with one end of a plurality of claw arms in the circumferential direction, the bottom of the claw arm is provided with a protrusion outwardly protruding, a plurality of first pin holes are formed in the circumferential direction on the claw sleeve, and a first breakable pin is fixed in the first pin hole one by one, a plurality of second pin holes are formed in the circumferential direction on the claw sleeve, and a pin shaft is fixed in the second pin hole one by one.

[0009] A retaining ring is jointly provided around all the claw arms, the bottom of the retaining ring abuts against the top of the protrusion, the top of the retaining ring abuts against the bottom of the clamping device, a tail cone sleeve is provided around the outer wall of the clamping device, the outer wall of the retaining ring and the outer wall of the first screw sleeve, and the inner wall of the tail cone sleeve abuts against the retaining ring.

[0010] A gear ring is provided on the outer wall of the central pipe between the central pipe and the setting sleeve, the gear teeth on the gear ring abut against the inner wall of the setting sleeve, an adjusting groove is formed in the axial direction on the gear teeth, one end of a plurality of second bolts is fixed in the adjusting groove, the other end of the second bolt is fixed to the inner wall of the setting sleeve, and a plurality of one-way sawteeth are provided in the circumferential direction at the positions where the gear ring and the central pipe abut against each other.

[0011] The clamping device comprises a first cone, the first cone wraps the outer wall of the claw sleeve and the outer wall of the setting sleeve, and the end of the first cone away from the sealing device is provided with a first taper; the clamping device further comprises a second cone, the second cone wraps the outer wall of the claw sleeve, and the tail cone sleeve wraps the outer wall of the second cone, the top of the retaining ring abuts against the bottom of the second cone, the end of the second cone close to the first cone is provided with a second taper, a plurality of slips are fixed in the circumferential direction between the first cone and the second cone, the side of the slip away from the claw sleeve is provided with an expansion slot, the position between the expansion slot and the first cone on the side of the expansion slot is provided with a first taper surface, a plurality of first prongs with the same direction are arranged in the axial direction on the first taper surface, the position between the expansion slot and the second cone on the side of the expansion slot is provided with a second taper surface, a plurality of second prongs with the opposite direction to the first prongs are arranged in the axial direction on the second taper surface, a slip sleeve is provided around the outer wall of the first cone, the outer wall of the second cone and all the slips, two rows of through holes are formed in the circumferential direction on the inner wall of the slip sleeve, one row of through holes corresponds to all the first prongs one by one, and the other row of through holes corresponds to all the second prongs one by one, and a spring is arranged between the bottom of the expansion slot and the inner wall of the slip sleeve.

[0012] The sealing device comprises a first compression ring, a first elastic ring, an isolation ring, a second elastic ring and a second compression ring which abut against each other in sequence along the same axis, the first compression ring, the first elastic ring, the isolation ring, the second elastic ring and the second compression ring are all provided on the outer wall of the setting sleeve, the first compression ring is close to the driving device, the bottom of the second compression ring abuts against the top of the first cone, and the bottom of the second compression ring is integrally connected with a sleeve which is sleeved on the outer wall of the first cone.

[0013] The driving device comprises an adjusting pipe, the adjusting pipe is sleeved on the rest outer wall of the connecting pipe and is sleeved with the setting sleeve, a third screw sleeve is sleeved on the outer wall of the adjusting pipe, the bottom of the third screw sleeve is connected with the first pressing ring, a connecting sleeve is sleeved on the rest outer wall of the adjusting pipe and the third screw sleeve, the outer wall of the adjusting pipe is fixedly connected with the inner wall of the connecting sleeve through a plurality of second breakable pins at a position close to the top, the setting device or the releasing device is fixedly connected to the top of the connecting sleeve, and the setting device is threadedly connected with one end of the first bolt if the setting device is fixedly connected to the top of the connecting sleeve.

[0014] A first sliding groove is formed in the outer wall of the adjusting pipe in the axial direction, a second sliding groove is formed in the outer wall of the connecting pipe in the axial direction, and a connecting pin is connected between the outer wall of the pull tube and the inner wall of the third screw sleeve and penetrates the first sliding groove and the second sliding groove.

[0015] The utility model discloses the beneficial effect is:

[0016] Compared with the prior art, the recyclable bridge plug structure is reasonable and reliable in performance, the driving device drives, the linkage device and the clamping device are linked to realize the outward expansion and inward contraction of the clamping device, the linkage device and the sealing device are linked to realize the outward expansion and inward contraction of the sealing device, and the linkage of the device itself can ensure that the expansion type clamping device moves first, and the installation and recovery of the bridge plug can be completed through the linkage between the components. DRAWINGS

[0017] Figure 1 It is the internal view of the recyclable bridge plug of the utility model,

[0018] Figure 2 It is the enlarged view of A in the recyclable bridge plug of the utility model,

[0019] Figure 3 It is the structure diagram of the ratchet claw of the recyclable bridge plug of the utility model,

[0020] Figure 4 It is the structure diagram of the clamping claw sleeve of the recyclable bridge plug of the utility model,

[0021] Figure 5 It is the structure diagram of the tooth ring of the recyclable bridge plug of the utility model,

[0022] Figure 6 It is the enlarged view of C in the recyclable bridge plug of the utility model,

[0023] Figure 7 It is the enlarged view of B in the recyclable bridge plug of the utility model,

[0024] Figure 8 It is the structure diagram of the upper cone body and the lower cone body of the recyclable bridge plug of the utility model,

[0025] Figure 9 is the enlarged view of D in the recyclable bridge plug of the utility model;

[0026] Figure 10 is the state diagram of the unsealing time of the recyclable bridge plug of the utility model;

[0027] Figure 11 is the state diagram of the setting time of the recyclable bridge plug of the utility model;

[0028] Figure 12 is the state diagram of the setting time of the recyclable bridge plug of the utility model.

[0029] In the figure, 1. driving device, 2. sealing device, 3. clamping device, 4. connecting sleeve, 5. third screw sleeve, 6. adjusting pipe, 7. connecting pipe, 8. first bolt, 9. first breakable pin, 10. connecting pin, 11. pin shaft, 12. second sliding groove, 13. first sliding groove, 14. first pressure ring, 15. first elastic ring, 16. isolation ring, 17. second pressure ring, 171. sleeve, 18. setting sleeve, 19. tooth ring, 20. center pipe, 21. adjusting groove, 22. one-way sawtooth, 23. pull pipe, 24. first cone, 241. first taper part, 25. slip sleeve, 26. second cone, 261. second taper part, 27. slip block, 271. first conical surface, 272. second conical surface, 28. second screw sleeve, 29. tail cone sleeve, 30. blocking ring, 31. claw sleeve, 311. claw arm, 312. boss, 313. first pin hole, 314. second pin hole, 32. sliding sleeve, 33. pawl sleeve, 34. first screw sleeve, 35. through hole, 36. spring, 37. telescopic groove, 38. second bolt, 39. one-way transmission tooth, 40. first claw, 41. first inclined surface, 42. second inclined surface, 43. second elastic ring, 44. second breakable pin, 45. second claw, 46. setting device, 47. unsealing device, 48. bridge plug body. DETAILED DESCRIPTION

[0030] The utility model will be described in detail below in combination with the drawings and specific embodiments.

[0031] Recyclable bridge plug, refer to Figure 1, including the bridge plug body 48, the pull tube 23 is sleeved on the bridge plug body 48, the connecting pipe 7, the central pipe 20, the sliding sleeve 32, the pawl sleeve 33 are sequentially sleeved outside the pull tube 23, the connecting pipe 7 and the central pipe 20 are sleeved, the first bolt 8 is connected to one end of the connecting pipe 7 extended to the outside of the pull tube 23; the pawl sleeve 31 is sleeved on the outer wall of the sliding sleeve 32 and the central pipe 20, the setting sleeve 18 is sleeved on the outer wall of the connecting pipe 7 and the remaining outer wall of the central pipe 20, the clamping device 3 is sleeved on the outer wall of the pawl sleeve 31 and the outer wall of the setting sleeve 18, the sealing device 2 is sleeved on the outer wall of the setting sleeve 18 and the outer wall of the clamping device 3, the driving device 1 is sleeved on the remaining outer wall of the connecting pipe 7 and the setting sleeve 18.

[0032] Referring to Figure 2 , the first inclined surface 41 is formed in the inner wall of the sliding sleeve 32, the pawl sleeve 33 is clamped between the pull tube 23 and the sliding sleeve 32, and the second inclined surface 42 is formed on the side opposite to the first inclined surface 41 of the pawl sleeve 33, referring to Figure 3 , a plurality of one-way transmission teeth 39 are circumferentially arranged at the positions where the pawl sleeve 33 and the pull tube 23 abut against each other, the one-way transmission teeth 39 only allow the pawl sleeve 33 to slide upward along the outer wall of the pull tube 23; the outer wall of the sliding sleeve 32 is fixedly connected to the inner wall of the pawl sleeve 31 through a plurality of first breakable pins 9 near the top, and the outer wall of the central pipe 20 is fixedly connected to the inner wall of the pawl sleeve 31 through a plurality of pin shafts 11 near the bottom.

[0033] The first screw sleeve 34 is further sleeved outside the pull tube 23, the top of the first screw sleeve 34 abuts against the bottom of the pawl sleeve 33, and a part of the first screw sleeve 34 is clamped between the pull tube 23 and the sliding sleeve 32.

[0034] Referring to Figure 4 , one end of each of the plurality of claw arms 311 is fixedly connected to the bottom of the pawl sleeve 31, the sliding sleeve 32 can provide a supporting force to each of the claw arms 311, the bottom of each of the claw arms 311 is provided with a protrusion 312 protruding outward, a plurality of first pin holes 313 are circumferentially formed in the pawl sleeve 31, and each of the first breakable pins 9 is fixedly arranged in one of the first pin holes 313, a plurality of second pin holes 314 are circumferentially formed in the pawl sleeve 31, and each of the pin shafts 11 is fixedly arranged in one of the second pin holes 314.

[0035] Referring to Figure 2 , the stop ring 30 is sleeved around all the claw arms 311, the bottom of the stop ring 30 abuts against the top of the protrusion 312, the protrusion 312 supports the stop ring 30, the top of the stop ring 30 abuts against the bottom of the clamping device 3, the tail cone sleeve 29 is sleeved on the outer wall of the clamping device 3, the outer wall of the stop ring 30 and the first screw sleeve 34, the inner wall of the tail cone sleeve 29 abuts against the stop ring 30, and the tapered structure on the tail cone sleeve 29 can guide the bridge plug body 48 when it is lowered into the well.

[0036] With reference to Figure 5 The tooth ring 19 is sleeved on the outer wall of the central pipe 20 between the central pipe 20 and the setting sleeve 18, the teeth on the tooth ring 19 abut against the inner wall of the setting sleeve 18, the teeth are provided with adjusting grooves 21 in the axial direction, with reference to Figure 6 One end of the second bolt 38 is fixed in the adjusting groove 21, the other end of the second bolt 38 is fixed to the inner wall of the setting sleeve 18, which can ensure that the teeth of the tooth ring 19 are always in close contact with the inner wall of the setting sleeve 18, so that the tooth ring 19 always moves synchronously with the setting sleeve 18, the positions where the tooth ring 19 and the central pipe 20 abut against each other are provided with a plurality of one-way sawteeth 22 in the circumferential direction, the one-way sawteeth 22 only allow the tooth ring 19 to slide downward along the outer wall of the central pipe 20.

[0037] With reference to Figure 7 The clamping device 3 comprises a first cone 24, the first cone 24 wraps the outer wall of part of the clamping sleeve 31 and part of the outer wall of the setting sleeve 18, the bottom of the setting sleeve 18 can slide relative to the first cone 24, with reference to Figure 8 The end of the first cone 24 away from the sealing device 2 is provided with a first tapered portion 241; the clamping device 3 further comprises a second cone 26, the second cone 26 wraps part of the outer wall of the clamping sleeve 31 and the tail cone sleeve 29 wraps part of the outer wall of the second cone 26, the top of the blocking ring 30 abuts against the bottom of the second cone 26, the end of the second cone 26 close to the first cone 24 is provided with a second tapered portion 261, a plurality of slips 27 are fixed between the first cone 24 and the second cone 26 in the circumferential direction of the clamping sleeve 31, the side of the slip 27 away from the clamping sleeve 31 is provided with an expansion groove 37, the position between the expansion groove 37 and the first cone 24 on the side where the expansion groove 37 is located is provided with a first tapered surface 271, the first cone 24 can be slidably connected with the first tapered surface 271, a plurality of first prongs 40 with consistent directions are arranged on the first tapered surface 271 in the axial direction, the position between the expansion groove 37 and the second cone 26 on the side where the expansion groove 37 is located is provided with a second tapered surface 272, the second cone 26 can be slidably connected with the second tapered surface 272, a plurality of second prongs 45 with opposite directions to the first prongs 40 are arranged on the second tapered surface 272 in the axial direction, the first cone 24, the second cone 26 and all the slips 27 are sleeved with a slip sleeve 25, two rows of through holes 35 are arranged on the inner wall of the slip sleeve 25 in the circumferential direction, one row of the through holes 35 corresponds to all the first prongs 40, and the other row of the through holes 35 corresponds to all the second prongs 45, a spring 36 is arranged between the bottom of the expansion groove 37 and the inner wall of the slip sleeve 25, and the spring 36 can provide a pushing force to the slip 27.

[0038] With reference to Figure 1The sealing device 2 comprises a first compression ring 14, a first elastic ring 15, an isolation ring 16, a second elastic ring 43 and a second compression ring 17 which are coaxially abutted in sequence, the first compression ring 14, the first elastic ring 15, the isolation ring 16, the second elastic ring 43 and the second compression ring 17 are all sleeved on the outer wall of the setting sleeve pipe 18 and the first compression ring 14 is close to the driving device 1, the bottom of the second compression ring 17 abuts against the top of the first cone 24, the bottom of the second compression ring 17 is integrally connected with a sleeve 171 which is sleeved on the outer wall of the first cone 24, and the first compression ring 14, the first elastic ring 15, the isolation ring 16, the second elastic ring 43 and the second compression ring 17 can slide along the outer wall of the setting sleeve pipe 18.

[0039] With reference to Figure 9 The driving device 1 comprises an adjusting pipe 6 which is sleeved on the rest of the outer wall of the connecting pipe 7 and is sleeved with the setting sleeve pipe 18, a third screw sleeve 5 is sleeved on part of the outer wall of the adjusting pipe 6 and the bottom of the third screw sleeve 5 is connected with the first compression ring 14, a connecting sleeve 4 is sleeved on the rest of the outer wall of the adjusting pipe 6 and the third screw sleeve 5, and the position close to the top of the outer wall of the adjusting pipe 6 is fixedly connected with the inner wall of the connecting sleeve 4 through a plurality of second breakable pins 44. Figure 10 And Figure 11 The top of the connecting sleeve 4 is fixedly connected with a setting device 46 or an unsetting device 47, if the top of the connecting sleeve 4 is fixedly connected with the setting device 46, the setting device 46 is threadedly connected with one end of the first bolt 8, the setting device 46 can generate an upward pulling force on the first bolt 8 and break the first bolt 8, and the unsetting device 47 can generate an upward pulling force on the connecting sleeve 4.

[0040] With reference to Figure 1 A first sliding groove 13 is formed on the outer wall of the adjusting pipe 6 in the axial direction, a second sliding groove 12 is formed on the outer wall of the connecting pipe 7 in the axial direction, a connecting pin 10 is connected between the outer wall of the pull pipe 23 and the inner wall of the third screw sleeve 5 and penetrates the first sliding groove 13 and the second sliding groove 12, and the connecting pin 10 can slide in the second sliding groove 12 and the first sliding groove 13 at the same time.

[0041] The working principle of the utility model is:

[0042] When the bridge plug body 48 is setting in the wellbore, the connecting sleeve 4 top is fixed to the setting device 46, the setting device 46 is screwed with one end of the first bolt 8, the first bolt 8 is pulled by the setting device 46 and a pulling force along the axis of the connecting sleeve 4 is generated, the pulling force is transmitted from the first bolt 8 to the connecting pipe 7, and then to the central pipe 20 and the jaw sleeve 31, at this time, the pulling force is divided into two parts along the axis of the jaw sleeve 31, one part of the pulling force is transmitted to the sliding sleeve 32 connected with the jaw sleeve 31, so as to drive the sliding sleeve 32 to move upward together, the other part of the pulling force is transmitted to the bottom of the jaw sleeve 31 and is converted into a pushing force acting on the retainer ring 30 through the boss 312, the pushing force is further transmitted from the retainer ring 30 to the second cone 26, so that the second cone 26 slides upward relative to the slip sleeve 25, the second cone 261 is in close contact with the second tapered surface 272 on each slip block 27 and forms a first pushing component on the second tapered surface 272; while the setting device 46 pulls the first bolt 8, the setting device 46 will generate a downward pushing force on the connecting sleeve 4, the pushing force is divided into a first downward pushing force and a second downward pushing force along the axis of the connecting sleeve 4 from the top of the connecting sleeve 4; the first downward pushing force is transmitted to the third screw sleeve 5, so that the third screw sleeve 5 is pressed onto the first compression ring 14 and is sequentially transmitted to the first elastic ring 15, the isolation ring 16, the second elastic ring 43, the second compression ring 17, the sleeve 171 and the first cone 24, the first downward pushing force makes the first cone 24 slide downward relative to the slip sleeve 25, the first cone 241 is in close contact with the first tapered surface 271 on each slip block 27 and forms a second pushing component on the first tapered surface 271; under the joint action of the first pushing component and the second pushing component, each slip block 27 will overcome the pushing force of the spring 36, so that each slip block 27 is pressed against the slip sleeve 25, and then the first claw 40 and the second claw 45 are exposed from the through hole 35 and are clamped and fixed to the inner wall of the wellbore; the second downward pushing force is sequentially transmitted to the adjusting pipe 6 and the setting sleeve 18 through the second breakable pin 44 and the connecting sleeve 4, so that the setting sleeve 18 can drive the tooth ring 19 to slide downward along the axis of the setting sleeve 18, since each slip block 27 is clamped and fixed to the inner wall of the wellbore, the first cone 24 has a supporting force on the second compression ring 17, the supporting force of the first cone 24 on the second compression ring 17 will make the first compression ring 14, the first elastic ring 15, the isolation ring 16, the second elastic ring 43, the second compression ring 17 and the sleeve 171 slide relative to the setting sleeve 18; at the same time, the first downward pushing force still acts on the first compression ring 14 through the connecting sleeve 4 and the third screw sleeve 5, so that the first compression ring 14 and the second compression ring 17 simultaneously generate a relative pressing force on the first elastic ring 15, the isolation ring 16 and the second elastic ring 43, the first elastic ring 15 and the second elastic ring 43 perform an expansion movement of length shortening and radius increasing under the action of the pressing force, until the outer surfaces of the first elastic ring 15 and the second elastic ring 43 are in close contact with the inner wall of the wellbore, so as to form a seal on the inner wall of the wellbore;At this time, the pulling force on the first bolt 8 is continued by the setting device 46 until the first bolt 8 is broken, and under the joint action of the second downward thrust, the setting sleeve 18 drives the tooth ring 19 to slide to the limit distance, thereby locking the bridge plug body 48 in the setting state.

[0043] When the bridge plug body 48 is in the process of unsetting in the wellbore, the connection sleeve 4 top is fixed to the unsetting device 47, and an upward pulling force is formed on the connection sleeve 4 through the unsetting device 47. When the second breakable pin 44 is broken, the pulling force makes the connection sleeve 4 slide upward relative to the adjusting pipe 6, and the pulling force is transmitted from the connection sleeve 4 to the third screw 5, so that the bottom of the third screw 5 is separated from the first compression ring 14, and then the third screw 5 loses the force acting on the first compression ring 14. Since the connection pin 10 connects the pull tube 23 and the third screw 5, the pulling force can make the pull tube 23 and the third screw 5 move upward synchronously, and the pawl sleeve 33 outside the pull tube 23 moves upward with the pull tube 23. While the pawl sleeve 33 moves upward, the pawl sleeve 33 is in close contact with the inner wall of the sliding sleeve 32, and an upward thrust is generated on the sliding sleeve 32, which can break the first breakable pin 9, so that the sliding sleeve 32, the pull tube 23 and the pawl 33 slide upward relative to the jaw sleeve 31 at the same time. When the sliding sleeve 32 is separated from each jaw arm 311, the sliding sleeve 32 loses the support force on each jaw arm 311, so that each jaw arm 311 is contracted in the direction of approaching the axis of the jaw sleeve 31 under the action of an external force, so that the boss 312 loses the support force on the stop ring 30, the stop ring 30 loses the support force on the second cone 26, and then the first pushing component disappears. The second pushing component is insufficient to resist the thrust formed by each spring 36 on each slip block 27, so under the action of the thrust, the second cone 26 moves downward with the tail cone sleeve 29, so that each slip block 27 moves close to the slip sleeve 25 at the same time, so that the first claw 40 and the second claw 45 re-probe into the through hole 35. At the same time, the first cone 24 loses the support force on the second compression ring 17, and is restored under the action of the rebound force of the first elastic ring 15 and the second elastic ring 43, and the length side length and the radius decrease, so that the first elastic ring 15 and the second elastic ring 43 are separated from the inner wall of the wellbore, and the sealing state of the wellbore is released, thereby completing the unsetting process. After the unsetting process is completed, the bridge plug body 48 and the unsetting device 47 are pulled out of the wellbore.

[0044] Example 1:

[0045] The recyclable bridge plug comprises a bridge plug body 48, a pull tube 23 sleeved on the bridge plug body 48, a connecting tube 7, a central tube 20, a sliding sleeve 32 and a pawl sleeve 33 which are sequentially sleeved outside the pull tube 23, the connecting tube 7 is sleeved with the central tube 20, and the first bolt 8 is connected to one end of the connecting tube 7 which extends to the outside of the pull tube 23; the pawl sleeve 31 is sleeved on the outer wall of the sliding sleeve 32 and the central tube 20, the setting sleeve 18 is sleeved on the outer wall of the connecting tube 7 and the remaining outer wall of the central tube 20, the clamping device 3 is sleeved on the outer wall of the pawl sleeve 31 and the outer wall of the setting sleeve 18, the sealing device 2 is sleeved on the outer wall of the setting sleeve 18 and the outer wall of the clamping device 3, and the driving device 1 is sleeved on the remaining outer wall of the connecting tube 7 and the setting sleeve 18.

[0046] The first inclined surface 41 is arranged on the inner wall of the sliding sleeve 32, the second inclined surface 42 is arranged on the side of the pawl sleeve 33 opposite to the first inclined surface 41, and the pawl sleeve 33 and the pull tube 23 are in abutment with each other at the positions which are circumferentially provided with eight one-way transmission teeth 39; the first breakable pin 9 is fixedly connected to the inner wall of the pawl sleeve 31 at the position close to the top of the outer wall of the sliding sleeve 32, and the pin shaft 11 is fixedly connected to the inner wall of the pawl sleeve 31 at the position close to the bottom of the outer wall of the central tube 20.

[0047] The first screw sleeve 34 is further sleeved outside the pull tube 23, the top of the first screw sleeve 34 is in abutment with the bottom of the pawl sleeve 33, and a part of the first screw sleeve 34 is connected between the pull tube 23 and the sliding sleeve 32.

[0048] The bottom of the pawl sleeve 31 is fixedly provided with one end of the eight pawl arms 311 in the circumferential direction, the bottom of the pawl arm 311 is provided with the outwardly protruding boss 312, the first pin hole 313 is arranged on the pawl sleeve 31 in the circumferential direction, and the first breakable pin 9 is correspondingly fixed in the first pin hole 313; the second pin hole 314 is arranged on the pawl sleeve 31 in the circumferential direction, and the pin shaft 11 is correspondingly fixed in the second pin hole 314.

[0049] The stop ring 30 is sleeved around all the pawl arms 311, the bottom of the stop ring 30 is in abutment with the top of the boss 312, the top of the stop ring 30 is in abutment with the bottom of the clamping device 3, the tail cone sleeve 29 is sleeved on the outer wall of the clamping device 3, the outer wall of the stop ring 30 and the first screw sleeve 34, and the inner wall of the tail cone sleeve 29 is in abutment with the stop ring 30.

[0050] Embodiment 2:

[0051] The recyclable bridge plug comprises a bridge plug body 48, a pull tube 23 sleeved on the bridge plug body 48, a connecting tube 7, a central tube 20, a sliding sleeve 32 and a ratchet sleeve 33 which are sequentially sleeved outside the pull tube 23, the connecting tube 7 is sleeved with the central tube 20, and a first bolt 8 is connected to one end of the connecting tube 7 which extends to the outside of the pull tube 23; a clamping sleeve 31 is sleeved on the outer wall of the sliding sleeve 32 and the central tube 20, a setting sleeve 18 is sleeved on the outer wall of the connecting tube 7 and the remaining outer wall of the central tube 20, a clamping device 3 is sleeved on the outer wall of the clamping sleeve 31 and the outer wall of the setting sleeve 18, a sealing device 2 is sleeved on the outer wall of the setting sleeve 18 and the outer wall of the clamping device 3, and a driving device 1 is sleeved with the setting sleeve 18 and sleeved on the remaining outer wall of the connecting tube 7.

[0052] A first inclined surface 41 is formed in the inner wall of the sliding sleeve 32, a second inclined surface 42 is formed on the side of the ratchet sleeve 33 opposite to the first inclined surface 41, and six one-way transmission teeth 39 are arranged in the circumferential direction at the positions where the ratchet sleeve 33 and the pull tube 23 abut against each other; seven first breakable pins 9 are fixed to the inner wall of the clamping sleeve 31 at the position close to the top of the outer wall of the sliding sleeve 32, and seven pin shafts 11 are fixed to the inner wall of the clamping sleeve 31 at the position close to the bottom of the outer wall of the central tube 20.

[0053] One end of seven clamping arm 311 is fixed to the bottom of the clamping sleeve 31, the bottom of the clamping arm 311 is provided with a boss 312 protruding outward, seven first pin holes 313 are formed in the clamping sleeve 31 in the circumferential direction, and the first breakable pins 9 are correspondingly fixed in the first pin holes 313, seven second pin holes 314 are formed in the clamping sleeve 31 in the circumferential direction, and the pin shafts 11 are correspondingly fixed in the second pin holes 314.

[0054] A gear ring 19 is sleeved on the outer wall of the central tube 20 between the central tube 20 and the setting sleeve 18, the teeth on the gear ring 19 abut against the inner wall of the setting sleeve 18, an adjusting groove 21 is formed in the teeth in the axial direction, one end of three second bolts 38 is fixed in the adjusting groove 21, the other end of the second bolts 38 is fixed to the inner wall of the setting sleeve 18, and ten one-way sawteeth 22 are arranged in the circumferential direction at the positions where the gear ring 19 and the central tube 20 abut against each other.

[0055] Embodiment 3:

[0056] The recyclable bridge plug comprises a bridge plug body 48, a pull tube 23 sleeved on the bridge plug body 48, a connecting tube 7, a central tube 20, a sliding sleeve 32 and a pawl sleeve 33 which are sequentially sleeved outside the pull tube 23, the connecting tube 7 is sleeved with the central tube 20, and a first bolt 8 is connected to one end of the connecting tube 7 which extends to the outside of the pull tube 23; a clamping sleeve 31 is sleeved on the outer wall of the sliding sleeve 32 and the central tube 20, a setting sleeve 18 is sleeved on the outer wall of the connecting tube 7 and the remaining outer wall of the central tube 20, a clamping device 3 is sleeved on the outer wall of the clamping sleeve 31 and the setting sleeve 18, a sealing device 2 is sleeved on the outer wall of the setting sleeve 18 and the clamping device 3, and a driving device 1 is sleeved on the remaining outer wall of the connecting tube 7 and is sleeved with the setting sleeve 18.

[0057] A first inclined surface 41 is formed on the inner wall of the sliding sleeve 32, a second inclined surface 42 is formed on the side of the pawl sleeve 33 opposite to the first inclined surface 41, and 10 one-way transmission teeth 39 are arranged on the positions where the pawl sleeve 33 and the pull tube 23 abut each other in the circumferential direction.

[0058] The first screw sleeve 34 is further sleeved outside the pull tube 23, the top of the first screw sleeve 34 abuts against the bottom of the pawl sleeve 33, and a part of the first screw sleeve 34 is clamped between the pull tube 23 and the sliding sleeve 32.

[0059] One end of 9 clamping arms 311 is fixed to the bottom of the clamping sleeve 31 in the circumferential direction, a boss 312 is arranged on the bottom of the clamping arm 311 and protrudes outward, 5 first pin holes 313 are formed on the clamping sleeve 31 in the circumferential direction, and the first breakable pins 9 are fixed in the first pin holes 313 one by one, 5 second pin holes 314 are formed on the clamping sleeve 31 in the circumferential direction, and the pin shafts 11 are fixed in the second pin holes 314 one by one.

[0060] A blocking ring 30 is sleeved around all the clamping arms 311, the bottom of the blocking ring 30 abuts against the top of the boss 312, the top of the blocking ring 30 abuts against the bottom of the clamping device 3, a tail cone sleeve 29 is sleeved on the outer wall of the clamping device 3, the top of the blocking ring 30, the first screw sleeve 34, and the inner wall of the tail cone sleeve 29 abuts against the blocking ring 30.

[0061] A tooth ring 19 is sleeved on the outer wall of the central tube 20 between the central tube 20 and the setting sleeve 18, the teeth on the tooth ring 19 abut against the inner wall of the setting sleeve 18, an adjusting groove 21 is formed on the tooth in the axial direction, one end of 4 second bolts 38 is fixed in the adjusting groove 21, the other end of the second bolts 38 is fixed to the inner wall of the setting sleeve 18, and 12 one-way sawteeth 22 are arranged on the positions where the tooth ring 19 and the central tube 20 abut against each other in the circumferential direction.

[0062] The clamping device 3 comprises a first cone 24 wrapped around part of the outer wall of the dog sleeve 31 and part of the outer wall of the setting sleeve 18, and a first taper portion 241 is arranged at the end of the first cone 24 away from the sealing device 2; the clamping device 3 further comprises a second cone 26 wrapped around part of the outer wall of the dog sleeve 31 and part of the outer wall of the tail cone sleeve 29, and the top of the retaining ring 30 abuts the bottom of the second cone 26, a second taper portion 261 is arranged at the end of the second cone 26 close to the first cone 24, and six slips 27 are fixed along the circumference of the dog sleeve 31 between the first cone 24 and the second cone 26, the side of the expansion slot 37 on the side of the slip 27 away from the dog sleeve 31 is provided with a first tapered surface 271, and six first prongs 40 are arranged on the first tapered surface 271 in the axial direction and in the same direction, the side of the expansion slot 37 on the side between the expansion slot 37 and the second cone 26 is provided with a second tapered surface 272, and six second prongs 45 are arranged on the second tapered surface 272 in the axial direction and in the opposite direction of the first prongs 40, the first cone 24, the second cone 26 and all the slips 27 are wrapped with a slip sleeve 25, two rows of through holes 35 are arranged on the inner wall of the slip sleeve 25 in the circumferential direction, and one row of through holes 35 corresponds to all the first prongs 40, and the other row of through holes 35 corresponds to all the second prongs 45, and the spring 36 is arranged between the bottom of the expansion slot 37 and the inner wall of the slip sleeve 25.

[0063] Embodiment 4:

[0064] The recyclable bridge plug comprises a bridge plug body 48, a pull tube 23 is sleeved on the bridge plug body 48, a connecting pipe 7, a central pipe 20, a sliding sleeve 32 and a ratchet sleeve 33 are sequentially sleeved outside the pull tube 23, the connecting pipe 7 and the central pipe 20 are sleeved, and a first bolt 8 is connected to one end of the connecting pipe 7 extending to the outside of the pull tube 23; the dog sleeve 31 is wrapped around part of the outer wall of the sliding sleeve 32 and the central pipe 20, the setting sleeve 18 is wrapped around part of the outer wall of the connecting pipe 7 and the remaining outer wall of the central pipe 20, the clamping device 3 is wrapped around part of the outer wall of the dog sleeve 31 and part of the outer wall of the setting sleeve 18, the sealing device 2 is wrapped around part of the outer wall of the setting sleeve 18 and part of the outer wall of the clamping device 3, and the driving device 1 is wrapped around the remaining outer wall of the connecting pipe 7 and is sleeved with the setting sleeve 18.

[0065] The first inclined surface 41 is arranged at the bottom of the inner wall of the sliding sleeve 32, the pawl sleeve 33 is connected between the pull tube 23 and the sliding sleeve 32, the second inclined surface 42 is arranged at the side opposite to the first inclined surface 41 of the pawl sleeve 33, and the positions where the pawl sleeve 33 and the pull tube 23 abut against each other are both circumferentially provided with nine one-way transmission teeth 39.

[0066] The bottom of the pawl sleeve 31 is circumferentially fixed with one end of eight pawl arms 311, the bottom of the pawl arm 311 is provided with a boss 312 protruding outward, the pawl sleeve 31 is circumferentially provided with six first pin holes 313, and the first breakable pin 9 is fixed in the first pin hole 313 one by one, the pawl sleeve 31 is circumferentially provided with seven second pin holes 314, and the pin shaft 11 is fixed in the second pin hole 314 one by one.

[0067] The blocking ring 30 is arranged around all the pawl arms 311, the bottom of the blocking ring 30 abuts against the top of the boss 312, the top of the blocking ring 30 abuts against the bottom of the clamping device 3, the tail cone sleeve 29 is arranged around the outer wall of the clamping device 3, the blocking ring 30 and the first screw sleeve 34, the inner wall of the tail cone sleeve 29 abuts against the blocking ring 30.

[0068] The tooth ring 19 is arranged on the outer wall of the central tube 20 between the central tube 20 and the setting sleeve 18, the teeth on the tooth ring 19 abut against the inner wall of the setting sleeve 18, the adjustment groove 21 is arranged on the tooth in the axial direction, one end of the five second bolts 38 is fixed in the adjustment groove 21, the other end of the second bolt 38 is fixed to the inner wall of the setting sleeve 18, and the positions where the tooth ring 19 and the central tube 20 abut against each other are both circumferentially provided with nine one-way sawteeth 22.

[0069] The clamping device 3 comprises a first taper 24 wrapped around part of the outer wall of the jaw sleeve 31 and part of the outer wall of the setting sleeve 18, and the first taper 24 is provided with a first taper portion 241 at the end away from the sealing device 2; the clamping device 3 further comprises a second taper 26 wrapped around part of the outer wall of the jaw sleeve 31 and part of the outer wall of the tail cone sleeve 29, and the top of the retaining ring 30 abuts the bottom of the second taper 26, the second taper 26 is provided with a second taper portion 261 at the end close to the first taper 24, and seven slips 27 are fixed circumferentially between the first taper 24 and the second taper 26 along the jaw sleeve 31, the side of the slip 27 away from the jaw sleeve 31 is provided with an expansion slot 37, the position between the expansion slot 37 and the first taper 24 on the side where the expansion slot 37 is located is provided with a first tapered surface 271, and seven first prongs 40 pointing in the same direction are arranged axially on the first tapered surface 271, the position between the expansion slot 37 and the second taper 26 on the side where the expansion slot 37 is located is provided with a second tapered surface 272, and seven second prongs 45 pointing in the opposite direction of the first prongs 40 are arranged axially on the second tapered surface 272, the first taper 24, the second taper 26 and all the slips 27 are wrapped with a slip sleeve 25, two rows of through holes 35 are arranged circumferentially on the inner wall of the slip sleeve 25, and one row of through holes 35 corresponds to all the first prongs 40, and the other row of through holes 35 corresponds to all the second prongs 45, and the spring 36 is arranged between the bottom of the expansion slot 37 and the inner wall of the slip sleeve 25.

[0070] The sealing device 2 comprises a first compression ring 14, a first elastic ring 15, an isolation ring 16, a second elastic ring 43 and a second compression ring 17 which are coaxially abutted in sequence, the first compression ring 14, the first elastic ring 15, the isolation ring 16, the second elastic ring 43 and the second compression ring 17 are all sleeved on the outer wall of the setting sleeve 18, and the first compression ring 14 is close to the driving device 1, the bottom of the second compression ring 17 abuts the top of the first taper 24, and the bottom of the second compression ring 17 is integrally connected with a sleeve 171 which is sleeved on the outer wall of the first taper 24.

[0071] Example 5:

[0072] The recyclable bridge plug comprises a bridge plug body 48, a pull tube 23 sleeved on the bridge plug body 48, a connecting tube 7, a central tube 20, a sliding sleeve 32 and a pawl sleeve 33 which are sequentially sleeved outside the pull tube 23, the connecting tube 7 is sleeved with the central tube 20, and the first bolt 8 is connected to one end of the connecting tube 7 which extends to the outside of the pull tube 23; the sliding sleeve 32 and the central tube 20 are sleeved with the pawl sleeve 31, the connecting tube 7 and the rest of the outer wall of the central tube 20 are sleeved with the setting sleeve 18, the outer wall of the pawl sleeve 31 and the outer wall of the setting sleeve 18 are sleeved with the clamping device 3, the outer wall of the setting sleeve 18 and the outer wall of the clamping device 3 are sleeved with the sealing device 2, and the rest of the outer wall of the connecting tube 7 is sleeved with the driving device 1 which is sleeved with the setting sleeve 18.

[0073] A first inclined surface 41 is formed on the inner wall of the sliding sleeve 32, a second inclined surface 42 is formed on the side of the pawl sleeve 33 opposite to the first inclined surface 41, and the pawl sleeve 33 is clamped between the pull tube 23 and the sliding sleeve 32; 7 one-way transmission teeth 39 are arranged on the positions where the pawl sleeve 33 and the pull tube 23 abut against each other in the circumferential direction; 7 first breakable pins 9 are fixed to the inner wall of the pawl sleeve 31 at the position close to the top of the outer wall of the sliding sleeve 32, and 6 pin shafts 11 are fixed to the inner wall of the pawl sleeve 31 at the position close to the bottom of the outer wall of the central tube 20.

[0074] One end of 8 clamping arms 311 is fixed to the bottom of the pawl sleeve 31 in the circumferential direction, a boss 312 protruding outward is arranged on the bottom of the clamping arm 311, 7 first pin holes 313 are formed on the pawl sleeve 31 in the circumferential direction, and the first breakable pins 9 are correspondingly fixed in the first pin holes 313; 6 second pin holes 314 are formed on the pawl sleeve 31 in the circumferential direction, and the pin shafts 11 are correspondingly fixed in the second pin holes 314.

[0075] A blocking ring 30 is sleeved around all the clamping arms 311, the bottom of the blocking ring 30 abuts against the top of the boss 312, the top of the blocking ring 30 abuts against the bottom of the clamping device 3, the outer wall of the clamping device 3, the blocking ring 30 and the first screw sleeve 34 are sleeved with the tail cone sleeve 29, and the inner wall of the tail cone sleeve 29 abuts against the blocking ring 30.

[0076] A tooth ring 19 is sleeved on the outer wall of the central tube 20 between the central tube 20 and the setting sleeve 18, the teeth on the tooth ring 19 abut against the inner wall of the setting sleeve 18, an adjusting groove 21 is formed on the tooth in the axial direction, one end of 4 second bolts 38 is fixed in the adjusting groove 21, the other end of the second bolts 38 is fixed to the inner wall of the setting sleeve 18, and 7 one-way sawteeth 22 are arranged on the positions where the tooth ring 19 and the central tube 20 abut against each other in the circumferential direction.

[0077] The clamping device 3 comprises a first taper 24 wrapped around part of the outer wall of the dog sleeve 31 and part of the outer wall of the setting sleeve 18, and the end of the first taper 24 away from the sealing device 2 is provided with a first taper portion 241; and a second taper 26 wrapped around part of the outer wall of the dog sleeve 31 and part of the outer wall of the tail cone sleeve 29, and the top of the retaining ring 30 abuts the bottom of the second taper 26, and the end of the second taper 26 close to the first taper 24 is provided with a second taper portion 261; and 10 slips 27 are fixed circumferentially between the first taper 24 and the second taper 26 along the dog sleeve 31, and the side of the slip 27 away from the dog sleeve 31 is provided with an expansion slot 37, and the position between the expansion slot 37 and the first taper 24 on the side where the expansion slot 37 is located is provided with a first tapered surface 271, and the first tapered surface 271 is provided with 8 first prongs 40 in the same direction along the axial direction, and the position between the expansion slot 37 and the second taper 26 on the side where the expansion slot 37 is located is provided with a second tapered surface 272, and the second tapered surface 272 is provided with 8 second prongs 45 in the opposite direction of the first prongs 40 along the axial direction, and the outer wall of the first taper 24, the outer wall of the second taper 26 and all the slips 27 are wrapped with a slip sleeve 25, and two rows of through holes 35 are formed in the inner wall of the slip sleeve 25 in the circumferential direction, and one row of through holes 35 corresponds to all the first prongs 40, and the other row of through holes 35 corresponds to all the second prongs 45, and the spring 36 is arranged between the bottom of the expansion slot 37 and the inner wall of the slip sleeve 25.

[0078] The sealing device 2 comprises a first pressure ring 14, a first elastic ring 15, an isolation ring 16, a second elastic ring 43 and a second pressure ring 17 which are coaxially abutted in sequence, and the first pressure ring 14, the first elastic ring 15, the isolation ring 16, the second elastic ring 43 and the second pressure ring 17 are all sleeved on the outer wall of the setting sleeve 18, and the first pressure ring 14 is close to the driving device 1, and the bottom of the second pressure ring 17 abuts the top of the first taper 24, and the bottom of the second pressure ring 17 is integrally connected with a sleeve 171 which is sleeved on the outer wall of the first taper 24.

[0079] The driving device 1 comprises an adjusting pipe 6 which is sleeved on the remaining outer wall of the connecting pipe 7 and is sleeved with the setting sleeve 18, and a third screw 5 is sleeved on part of the outer wall of the adjusting pipe 6 and the bottom of the third screw 5 is connected with the first pressure ring 14, and a connecting sleeve 4 is sleeved on the remaining outer wall of the adjusting pipe 6 and the third screw 5, and the outer wall of the adjusting pipe 6 is fixedly connected with the inner wall of the connecting sleeve 4 at the position close to the top through six second breakable pins 44, and the top of the connecting sleeve 4 is fixedly connected with an unsealing device 47.

[0080] Embodiment 6:

[0081] The recyclable bridge plug comprises a bridge plug body 48, a pull tube 23 sleeved on the bridge plug body 48, a connecting tube 7, a central tube 20, a sliding sleeve 32 and a pawl sleeve 33 which are sequentially sleeved outside the pull tube 23, the connecting tube 7 is sleeved with the central tube 20, and the first bolt 8 is connected to one end of the connecting tube 7 which extends to the outside of the pull tube 23; the pawl sleeve 31 is sleeved on the outer wall of the sliding sleeve 32 and the central tube 20, the setting sleeve 18 is sleeved on the outer wall of the connecting tube 7 and the remaining outer wall of the central tube 20, the clamping device 3 is sleeved on the outer wall of the pawl sleeve 31 and the outer wall of the setting sleeve 18, the sealing device 2 is sleeved on the outer wall of the setting sleeve 18 and the outer wall of the clamping device 3, and the driving device 1 is sleeved with the setting sleeve 18 and sleeved on the remaining outer wall of the connecting tube 7.

[0082] The first inclined surface 41 is arranged on the inner wall of the sliding sleeve 32, the second inclined surface 42 is arranged on the side of the pawl sleeve 33 opposite to the first inclined surface 41, and the pawl sleeve 33 is clamped between the pull tube 23 and the sliding sleeve 32; 10 one-way transmission teeth 39 are arranged on the position where the pawl sleeve 33 and the pull tube 23 abut each other in the circumferential direction; the first breakable pin 9 is fixedly connected to the inner wall of the pawl sleeve 31 at the position close to the top of the outer wall of the sliding sleeve 32, and the pin shaft 11 is fixedly connected to the inner wall of the pawl sleeve 31 at the position close to the bottom of the outer wall of the central tube 20.

[0083] The first screw sleeve 34 is further sleeved outside the pull tube 23, the top of the first screw sleeve 34 abuts against the bottom of the pawl sleeve 33, and a part of the first screw sleeve 34 is clamped between the pull tube 23 and the sliding sleeve 32.

[0084] The bottom of the pawl sleeve 31 is fixedly connected with one end of the 9 pawl arms 311 in the circumferential direction, the bottom of the pawl arm 311 is provided with the outwardly protruding boss 312, the first pin hole 313 is arranged on the pawl sleeve 31 in the circumferential direction, and the first breakable pin 9 is correspondingly fixed in the first pin hole 313; the second pin hole 314 is arranged on the pawl sleeve 31 in the circumferential direction, and the pin shaft 11 is correspondingly fixed in the second pin hole 314.

[0085] The stop ring 30 is sleeved around all the pawl arms 311, the bottom of the stop ring 30 abuts against the top of the boss 312, the top of the stop ring 30 abuts against the bottom of the clamping device 3, the tail cone sleeve 29 is sleeved on the outer wall of the clamping device 3, the outer wall of the stop ring 30 and the outer wall of the first screw sleeve 34, and the inner wall of the tail cone sleeve 29 abuts against the stop ring 30.

[0086] The clamping device 3 comprises a first taper 24, which wraps the outer wall of part of the dog sleeve 31 and the outer wall of part of the setting sleeve 18, and the end of the first taper 24 away from the sealing device 2 is provided with a first taper portion 241; and a second taper 26, which wraps the outer wall of part of the dog sleeve 31 and the outer wall of part of the tail cone sleeve 29 wraps the outer wall of part of the second taper 26, the top of the retaining ring 30 abuts the bottom of the second taper 26, and the end of the second taper 26 close to the first taper 24 is provided with a second taper portion 261; eight slips 27 are fixed circumferentially between the first taper 24 and the second taper 26 along the dog sleeve 31, the side of the slip 27 away from the dog sleeve 31 is provided with an expansion slot 37, the position between the expansion slot 37 and the first taper 24 on the side where the expansion slot 37 is located is provided with a first tapered surface 271, and nine first prongs 40 pointing in the same direction are arranged axially on the first tapered surface 271; the position between the expansion slot 37 and the second taper 26 on the side where the expansion slot 37 is located is provided with a second tapered surface 272, and nine second prongs 45 pointing in the opposite direction of the first prongs 40 are arranged axially on the second tapered surface 272; the outer wall of part of the first taper 24, the outer wall of part of the second taper 26, and all the slips 27 are sleeved with a slip sleeve 25, two rows of through holes 35 are arranged circumferentially on the inner wall of the slip sleeve 25, and one row of through holes 35 corresponds to all the first prongs 40, and the other row of through holes 35 corresponds to all the second prongs 45; the spring 36 is arranged between the bottom of the expansion slot 37 and the inner wall of the slip sleeve 25.

[0087] The sealing device 2 comprises a first compression ring 14, a first elastic ring 15, an isolation ring 16, a second elastic ring 43, and a second compression ring 17, which are coaxially abutted in sequence, and the first compression ring 14, the first elastic ring 15, the isolation ring 16, the second elastic ring 43, and the second compression ring 17 are all sleeved on the outer wall of the setting sleeve 18, and the first compression ring 14 is close to the driving device 1, the bottom of the second compression ring 17 abuts the top of the first taper 24, and the bottom of the second compression ring 17 is integrally connected with a sleeve 171, and the sleeve 171 is sleeved on the outer wall of the first taper 24.

[0088] The driving device 1 comprises an adjusting pipe 6, which is sleeved on the remaining outer wall of the connecting pipe 7 and is sleeved with the setting sleeve 18, a third screw sleeve 5 is sleeved on part of the outer wall of the adjusting pipe 6, and the bottom of the third screw sleeve 5 is connected with the first compression ring 14, a connecting sleeve 4 is sleeved on the remaining outer wall of the adjusting pipe 6 and the third screw sleeve 5, the position close to the top of the outer wall of the adjusting pipe 6 is fixedly connected with the inner wall of the connecting sleeve 4 through five second breakable pins 44, the top of the connecting sleeve 4 is fixedly connected with a setting device 46, and the setting device 46 is threadedly connected with one end of the first bolt 8.

[0089] The first sliding groove 13 is axially arranged on the outer wall of the adjusting pipe 6, the second sliding groove 12 is axially arranged on the outer wall of the connecting pipe 7 and the first sliding groove 13, and the connecting pin 10 is connected between the outer wall of the pull pipe 23 and the inner wall of the third screw sleeve 5 and penetrates the first sliding groove 13 and the second sliding groove 12.

Claims

1. A retrievable bridge plug, characterized by The bridge plug body (48) is sleeved with a pull tube (23), the pull tube (23) is sequentially sleeved with a connecting pipe (7), a central pipe (20), a sliding sleeve (32), a pawl sleeve (33), the connecting pipe (7) and the central pipe (20) are sleeved, and one end of the connecting pipe (7) is connected with one end of the first bolt (8) after extending to the outside of the pull tube (23); the sliding sleeve (32) and the central pipe (20) are sleeved with the pawl sleeve (31) on the outer wall, the connecting pipe (7) and the rest of the outer wall of the central pipe (20) are sleeved with the setting sleeve (18), the pawl sleeve (31) and the setting sleeve (18) are sleeved with the clamping device (3) on the outer wall, the setting sleeve (18) and the clamping device (3) are sleeved with the sealing device (2) on the outer wall, and the rest of the outer wall of the connecting pipe (7) is sleeved with the driving device (1) and the driving device (1) is sleeved with the setting sleeve (18).

2. The retrievable bridge plug of claim 1, wherein, The first inclined surface (41) is arranged on the inner wall of the sliding sleeve (32), the pawl sleeve (33) is connected between the pull tube (23) and the sliding sleeve (32), the second inclined surface (42) is arranged on the side, opposite to the first inclined surface (41), of the pawl sleeve (33), and a plurality of one-way transmission teeth (39) are arranged on the position, where the pawl sleeve (33) and the pull tube (23) abut each other, in the circumferential direction; the first breakable pin (9) is fixedly connected between the inner wall of the pawl sleeve (31) and the outer wall of the sliding sleeve (32) near the top, and the pin shaft (11) is fixedly connected between the inner wall of the pawl sleeve (31) and the outer wall of the central pipe (20) near the bottom.

3. The retrievable bridge plug of claim 1, wherein, The pull tube (23) is further sleeved with the first screw sleeve (34), the top of the first screw sleeve (34) abuts against the bottom of the pawl sleeve (33), and a part of the first screw sleeve (34) is connected between the pull tube (23) and the sliding sleeve (32).

4. The retrievable bridge plug of claim 2, wherein, The bottom of the pawl sleeve (31) is fixedly connected with one end of the plurality of pawl arms (311) in the circumferential direction, the bottom of the pawl arm (311) is provided with the boss (312) protruding outward, the first pin hole (313) is arranged on the pawl sleeve (31) in the circumferential direction, the first breakable pin (9) is fixedly arranged in the first pin hole (313) in one-to-one correspondence, the second pin hole (314) is arranged on the pawl sleeve (31) in the circumferential direction, and the pin shaft (11) is fixedly arranged in the second pin hole (314) in one-to-one correspondence.

5. The retrievable bridge plug of claim 4, wherein, The stop ring (30) is sleeved around all the pawl arms (311), the bottom of the stop ring (30) abuts against the top of the boss (312), the top of the stop ring (30) abuts against the bottom of the clamping device (3), the tail cone sleeve (29) is sleeved with the part of the outer wall of the clamping device (3), the stop ring (30) and the first screw sleeve (34), the inner wall of the tail cone sleeve (29) abuts against the stop ring (30).

6. The retrievable bridge plug according to any one of claims 1-5, wherein, A gear ring (19) is arranged on the outer wall of the central pipe (20) between the central pipe (20) and the setting sleeve (18), the gear teeth on the gear ring (19) abut against the inner wall of the setting sleeve (18), an adjusting groove (21) is formed on the gear teeth in the axial direction, one end of a plurality of second bolts (38) is fixed in the adjusting groove (21), the other end of the second bolts (38) is fixed to the inner wall of the setting sleeve (18), and a plurality of one-way sawteeth (22) are arranged in the circumferential direction at the positions where the gear ring (19) and the central pipe (20) abut against each other.

7. The retrievable bridge plug of claim 5 wherein, The clamping device (3) comprises a first cone (24) which wraps the outer wall of the jaw sleeve (31) and the outer wall of the setting sleeve (18), and a first taper portion (241) is arranged at the end of the first cone (24) away from the sealing device (2); the clamping device (3) further comprises a second cone (26) which wraps the outer wall of the jaw sleeve (31) and the outer wall of the tail cone sleeve (29) which wraps the outer wall of the second cone (26), the top of the blocking ring (30) abuts against the bottom of the second cone (26), a second taper portion (261) is arranged at the end of the second cone (26) close to the first cone (24), a plurality of jaw blocks (27) are fixed in the circumferential direction of the jaw sleeve (31) between the first cone (24) and the second cone (26), an expansion groove (37) is formed on the side of the jaw block (27) away from the jaw sleeve (31), a first tapered surface (271) is arranged on the side of the expansion groove (37) between the expansion groove (37) and the first cone (24), a plurality of first prongs (40) with the same direction are arranged on the first tapered surface (271) in the axial direction, a second tapered surface (272) is arranged on the side of the expansion groove (37) between the expansion groove (37) and the second cone (26), a plurality of second prongs (45) with the opposite direction to the first prongs (40) are arranged on the second tapered surface (272) in the axial direction, a jaw sleeve (25) wraps the outer wall of the first cone (24), the outer wall of the second cone (26) and all the jaw blocks (27), a plurality of through holes (35) are formed in the circumferential direction on the inner wall of the jaw sleeve (25), one row of the through holes (35) correspond to all the first prongs (40) one by one, and the other row of the through holes (35) correspond to all the second prongs (45) one by one, and a spring (36) is arranged between the bottom of the expansion groove (37) and the inner wall of the jaw sleeve (25).

8. The retrievable bridge plug of claim 7, wherein, The sealing device (2) comprises a first compression ring (14), a first elastic ring (15), an isolation ring (16), a second elastic ring (43) and a second compression ring (17) which are coaxially abutted in sequence, the first compression ring (14), the first elastic ring (15), the isolation ring (16), the second elastic ring (43) and the second compression ring (17) are all sleeved on the outer wall of the setting sleeve (18) and the first compression ring (14) is close to the driving device (1), the bottom of the second compression ring (17) abuts against the top of the first cone (24), the bottom of the second compression ring (17) is integrally connected with a sleeve (171) and the sleeve (171) is sleeved on the outer wall of the first cone (24).

9. The retrievable bridge plug of claim 8, wherein, The driving device (1) comprises an adjusting pipe (6), the adjusting pipe (6) is sleeved on the rest of the outer wall of the connecting pipe (7) and the adjusting pipe (6) is sleeved with the setting sleeve (18), the third screw sleeve (5) is sleeved on part of the outer wall of the adjusting pipe (6) and the bottom of the third screw sleeve (5) is connected with the first compression ring (14), the connecting sleeve (4) is sleeved on the rest of the outer wall of the adjusting pipe (6) and the third screw sleeve (5), the second breakable pin (44) is fixedly connected between the inner wall of the connecting sleeve (4) and the outer wall of the adjusting pipe (6) near the top, the setting device (46) or the unsetting device (47) is fixedly connected to the top of the connecting sleeve (4), if the setting device (46) is fixedly connected to the top of the connecting sleeve (4), the setting device (46) is threadedly connected with one end of the first bolt (8).

10. The retrievable bridge plug of claim 9, wherein, The first sliding groove (13) is axially formed on the outer wall of the adjusting pipe (6), the second sliding groove (12) is axially formed on the outer wall of the connecting pipe (7), the connecting pin (10) is connected between the outer wall of the pull pipe (23) and the inner wall of the third screw sleeve (5) and penetrates the first sliding groove (13) and the second sliding groove (12).

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