CN115030686A

CN115030686A - Recyclable oil pipe bridge plug and setting tool

Info

Publication number: CN115030686A
Application number: CN202210788258.7A
Authority: CN
Inventors: 侯立东; 石庆伟; 王伟; 郝彬瑞
Original assignee: Heli Tech Energy Co ltd
Current assignee: Deep Blue Tianjin Intelligent Manufacturing Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-09-09

Abstract

The invention relates to the technical field of oil and gas exploitation, in particular to a recyclable oil pipe bridge plug and a setting tool, which comprise a fishing head, a setting barrel, a recovery barrel, an upper barrel sleeve, a rubber barrel, a lower barrel sleeve, an anti-loosening barrel, an upper cone, a first slip cage, a lower cone and a guide shoe which are sequentially connected end to end from top to bottom, wherein the inside of the setting barrel comprises a feeding barrel, a locking sleeve seat and a mandrel which are sequentially connected end to end from top to bottom, the bottom end of the mandrel sequentially penetrates through the recovery barrel, the upper barrel sleeve, the rubber barrel, the lower barrel sleeve, the anti-loosening barrel, the upper cone and the first slip cage from bottom to bottom, and the bottom of the mandrel is fixedly connected with the lower cone. The bridge plug can be salvaged and recovered through the setting tool, so that a shaft is prevented from being blocked by bridge plug scraps, the shaft is protected, and the operation efficiency is improved.

Description

Recyclable oil pipe bridge plug and setting tool

Technical Field

The invention relates to the technical field of oil and gas exploitation, in particular to a recyclable oil pipe bridge plug and a setting tool.

Background

At present, in the process of oil field development, the fracturing operation can be adopted to fracture an oil storage layer, so that the oil storage layer generates cracks, and the oil quantity discharged from the cracks of the oil storage layer is increased. The operation process of the fracturing operation generally comprises the steps of perforating an oil pipe casing by using a perforation technology, communicating an oil storage layer with the oil pipe casing at the perforated position, then injecting fracturing fluid into the oil pipe casing, enabling the fracturing fluid to flow into the oil storage layer, pressurizing the fracturing fluid, enabling the oil storage layer to crack under the action of the pressurized fracturing fluid, enabling oil in the oil storage layer to flow out of the crack, and enabling the oil to flow into the oil pipe casing through holes in the oil pipe casing.

The bridge plug is an important tool in fracturing operation and well repairing operation, is used for interlayer packing, has the characteristics of less construction procedures, short period and accurate blocking position, and is widely used in petroleum process technology. For drillable bridge plugs, the bridge plugs in the shaft are required to be milled after shaft operation is completed, so that the workload is increased, and in the drilling and grinding process, drilling and grinding chips are not favorable for circular discharge, and under extreme conditions, oil pipes can be stuck and need to be salvaged, so that the operation efficiency is very low, and the shaft wall and an oil-gas layer are damaged greatly. From structural, traditional bridging plug structure is complicated, the size is great, to the comparatively complicated well of well depth structure, and the interlayer seals apart has strict requirement, and high-quality seal effect can effectual guarantee operation safety in the operation. Therefore, the recyclable bridge plug which is simple in structure, excellent in performance, efficient, accurate and small-sized has important significance for underground operation of the oil-gas field. Therefore, a recyclable oil pipe bridge plug and a setting tool are provided to well solve the above disadvantages.

Disclosure of Invention

The invention aims to provide a recyclable oil pipe bridge plug and a setting tool, which are used for solving the problems in the background technology.

The invention is realized by the following technical scheme:

a recyclable oil pipe bridge plug comprises a fishing head, a setting cylinder, a recovery cylinder, an upper rubber cylinder sleeve, a rubber cylinder, a lower rubber cylinder sleeve, an anti-loosening cylinder, an upper cone, a first slip cage, a lower cone and a guide shoe which are sequentially connected end to end from top to bottom, wherein the inside of the setting cylinder comprises a feeding cylinder, a locking sleeve seat and a mandrel which are sequentially connected end to end from top to bottom, the bottom end of the mandrel sequentially penetrates through the recovery cylinder, the upper rubber cylinder sleeve, the rubber cylinder, the lower rubber cylinder sleeve, the anti-loosening cylinder, the upper cone and the first slip cage from bottom to bottom and extends to the lower cone, and the bottom of the mandrel is fixedly connected with the lower cone;

an unsealing sleeve is fixedly arranged inside the lock sleeve seat, a lock sleeve is sleeved outside the lock sleeve seat, a clamping groove penetrates through the side wall of the lock sleeve seat, and an unsealing ring is embedded in the clamping groove; evenly be provided with a plurality of first slips in the inside of first slips cage along circumference, first slips is U style of calligraphy, the both ends of first slips all pass window on the first slips cage, and a plurality of the common cover of outside of first slips is equipped with chucking spring, and is a plurality of the inner wall of first slips all with the surface laminating of dabber.

Optionally, the bottom of the anti-loosening cylinder pass through the screw with go up cone fixed connection, the top of the anti-loosening cylinder with the rubber sleeve links to each other down, the inside of the anti-loosening cylinder is equipped with the release spring, the upper and lower both ends of the release spring respectively with down the rubber sleeve and the protruding cyclic annular circular bead butt that is of anti-loosening cylinder inner wall.

Optionally, an annular movable groove is formed in the inner wall of the anti-loosening cylinder, a slip locking ring is arranged inside the movable groove, and the slip locking ring is movably sleeved outside the mandrel.

Optionally, sealing pistons are arranged inside the lower rubber sleeve and the upper rubber sleeve, the two sealing pistons are abutted to the end face of the rubber sleeve, and an inner ring of each sealing piston is attached to the outer surface of the mandrel; the inner walls of the lower rubber cylinder sleeve and the upper rubber cylinder sleeve are provided with anti-rotation lock pins, and the outer surface of the sealing piston is provided with lock pin holes matched with the anti-rotation lock pins.

Optionally, a lock ring is sleeved outside the lock sleeve, lock teeth are uniformly arranged on the outer surface of the lock sleeve along the circumferential direction, teeth matched with the lock teeth are formed on the inner surface of the lock ring in a protruding mode, and the teeth are meshed with the lock teeth.

A setting tool comprises an outer fishing neck and an inner mandrel fixedly connected to the bottom end of the outer fishing neck, wherein a reversing mandrel is sleeved outside the inner mandrel, a setting shaft is fixedly sleeved on the outer side of the bottom of the reversing mandrel and is cylindrical, and a feeding mandrel is fixedly sleeved on the inner side of the bottom of the setting shaft; a second slip cage, a spring sleeve and a reversing sleeve are sequentially sleeved outside the reversing mandrel from top to bottom, the bottom of the second slip cage is sleeved outside the top of the spring sleeve and is fixedly connected with the spring sleeve, the top of the reversing sleeve is sleeved outside the bottom of the spring sleeve and is fixedly connected with the spring sleeve, and the reversing sleeve is in sliding fit with the reversing mandrel along the axial direction of the reversing mandrel;

an elastic centralizer is sleeved outside the spring sleeve, the top end of the elastic centralizer is fixedly connected with the spring sleeve, the bottom end of the elastic centralizer is fixedly connected with a spring seat, a pre-tightening spring is sleeved outside the spring sleeve and below the spring seat, and the upper end and the lower end of the pre-tightening spring are respectively abutted against the bottom surface of the spring seat and the top surface of the reversing sleeve;

the inside of second slips cage evenly is provided with a plurality of second slips of quantity along the circumference of second slips cage, the second slips with along the axis direction sliding fit of second slips cage between the second slips cage, the butt joint groove has been seted up to the surface of second slips, the periphery wall of second slips cage evenly be provided with the muscle that resets of second slips one-to-one, the one end of muscle that resets with second slips cage fixed connection, the other end of muscle that resets extends to the butt joint inslot and with the laminating of the inner wall in butt joint groove.

Optionally, an elastic claw is slidably sleeved outside the feeding mandrel, the elastic claw is cylindrical, and claw lobes are uniformly distributed at the bottom of the elastic claw; a copper pin is arranged on the side wall of the elastic claw in a penetrating manner, a strip-shaped slotted hole is formed in the outer surface of the feeding core shaft along the axial direction, and the inner end of the copper pin is embedded into the slotted hole; the side wall of the elastic claw is provided with a through hole in a penetrating mode, a pressing ring and a stop block are arranged in the through hole, the pressing ring is fixedly welded to the inner wall of the through hole, and the bottom end of the stop block is abutted to a ring platform protruding out of the outer surface of the feeding core shaft.

Optionally, the fixed cover in the top outside of switching-over dabber is equipped with the cone, the cone is the cylinder, the bottom activity of cone is embedded into the inboard of second slips cage, just the bottom surface of cone is the inclined plane form of downward sloping, the top internal surface of second slips with the laminating of the bottom surface of cone.

Optionally, the outside fixed cover of sitting the axle is equipped with a fixed section of thick bamboo and transmission cover, the inside of sitting the axle and the bottom fixedly connected with jump bit that is located the inner core axle, the fixed surface of jump bit has inlayed the sitting key, run through on the lateral wall of transmission cover and seted up the sitting hole, the outer end of sitting the key passes the sitting axle and the activity is embedded into in the sitting hole.

Optionally, the outside of switching-over dabber just is located the inboard cover of switching-over cover is equipped with changes the fixed cover of round pin, it has seted up changeing the pinhole to run through on the lateral wall of changeing the fixed cover of round pin, the inside activity embedding of commentaries on classics pinhole has the switching-over round pin, the surface of switching-over dabber has seted up the switching-over groove along the axial, the inner activity embedding of switching-over round pin is in the switching-over inslot.

Compared with the prior art, the invention provides a recyclable oil pipe bridge plug and setting tool, which has the following beneficial effects:

1. the bridge plug can be salvaged and recovered through the setting tool, so that a shaft is prevented from being stuck by bridge plug scraps, the shaft is protected, and the operation efficiency is improved;

2. the bridge plug is simple in structure and small in size, so that the bridge plug is also suitable for a shaft with a complex well depth structure, and the universality of the bridge plug is improved.

Drawings

FIG. 1 is a schematic view of a bridge plug according to the present invention;

FIG. 2 is a partial schematic view of the upper section of the bridge plug structure of the present invention;

FIG. 3 is a partial schematic view of a middle section of a bridge plug structure according to the present invention;

FIG. 4 is a partial view of the lower section of the bridge plug structure of the present invention;

FIG. 5 is a schematic view of a first slip cage configuration of the present invention;

FIG. 6 is a schematic view of a lock sleeve structure according to the present invention;

FIG. 7 is a schematic view of a setting tool of the present invention;

FIG. 8 is a partial schematic view of an upper section of a setting tool of the present invention;

FIG. 9 is a partial schematic view of a mid-section of the setting tool of the present invention;

FIG. 10 is a partial view of the lower section of the setting tool of the present invention;

FIG. 11 is a schematic view of a second slip cage configuration of the present invention.

In the figure: 101. guiding a shoe; 102. a lower cone; 103. a first slip cage; 104. an upper cone; 105. a first slip; 106. an anti-loosening cylinder; 107. a rubber sleeve is arranged; 108. a sealing piston; 109. a rubber cylinder; 110. an upper rubber sleeve; 111. a slip locking ring; 112. a card slot; 113. a recovery cylinder; 114. a lock sleeve seat; 115. a lock sleeve; 116. a locking ring; 117. unpacking; 118. unsealing the ring; 119. feeding into a barrel; 120. setting the cylinder; 121. fishing the head; 122. a chucking spring; 123. a shoulder; 124. releasing the spring; 125. locking teeth; 126. teeth; 127. an anti-rotation lock pin; 128. a mandrel; 201. Feeding into a mandrel; 202. an elastic claw; 203. pressing a ring; 204. a stopper; 205. copper pins; 206. a locking spring; 207. a seating shaft; 208. an impact hammer; 209. setting a key; 210. a transfer sleeve; 211. a fixed cylinder; 212. an inner mandrel; 213. fishing out the neck; 214. a cone; 215. a spring housing; 216. a spring seat; 217. a rotating pin fixing sleeve; 218. a reversing sleeve; 219. a reversing pin; 220. resetting the rib; 221. an elastic centralizer; 222. pre-tightening the spring; 223. a reversing mandrel; 224. a second slip; 225. a butt joint groove; 226. a slot; 227. a second slip cage.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Example 1

Referring to fig. 1 to 6, the embodiment provides a recoverable oil pipe bridge plug, which includes a fishing head 121, a setting cylinder 120, a recovery cylinder 113, an upper rubber cylinder sleeve 110, a rubber cylinder 109, a lower rubber cylinder sleeve 107, a locking cylinder 106, an upper cone 104, a first slip cage 103, a lower cone 102 and a guide shoe 101 that are sequentially connected end to end from top to bottom, the setting cylinder 120 includes a feeding cylinder 119, a locking sleeve seat 114 and a mandrel 128 that are sequentially connected end to end from top to bottom, the bottom end of the mandrel 128 sequentially penetrates through the recovery cylinder 113, the upper rubber cylinder sleeve 110, the rubber cylinder 109, the lower rubber cylinder sleeve 107, the locking cylinder 106, the upper cone 104 and the first slip cage 103 from bottom to bottom and extends to the lower cone 102, and the bottom of the mandrel 128 is fixedly connected with the lower cone 102; an unsealing sleeve 117 is fixedly arranged inside the lock sleeve seat 114, a lock sleeve 115 is sleeved outside the lock sleeve seat 114, a clamping groove 112 penetrates through the side wall of the lock sleeve seat 114, and an unsealing ring 118 is embedded in the clamping groove 112; the inside of first slip cage 103 evenly is provided with a plurality of first slips 105 along circumference, and first slips 105 is U style of calligraphy, and the window on first slip cage 103 is all passed at the both ends of first slips 105, and the common cover of the outside of a plurality of first slips 105 is equipped with chucking spring 122, and the inner wall of a plurality of first slips 105 all laminates with the surface of dabber 128.

On the basis of the above embodiments, as shown in fig. 4, the bottom end of the anti-loosening cylinder 106 is fixedly connected with the upper cone 104 through a screw, the top end of the anti-loosening cylinder 106 is connected with the lower rubber cylinder sleeve 107, the anti-loosening cylinder 106 is internally provided with a loosening spring 124, and the upper end and the lower end of the loosening spring 124 are respectively abutted with the lower rubber cylinder sleeve 107 and an annular shoulder 123 protruding from the inner wall of the anti-loosening cylinder 106. An annular movable groove is formed in the inner wall of the anti-loosening cylinder 106, a slip locking ring 111 is arranged inside the movable groove, and the slip locking ring 111 is movably sleeved outside the mandrel 128.

On the basis of the above embodiments, as shown in fig. 3 and 4, the sealing pistons 108 are arranged inside the lower rubber sleeve 107 and the upper rubber sleeve 110, both the sealing pistons 108 abut against the end face of the rubber sleeve 109, and the inner ring of the sealing piston 108 is attached to the outer surface of the mandrel 128; the inner walls of the lower rubber cylinder sleeve 107 and the upper rubber cylinder sleeve 110 are both provided with anti-rotation lock pins 127, and the outer surface of the sealing piston 108 is provided with lock pin holes matched with the anti-rotation lock pins 127. As shown in fig. 6, the lock sleeve 115 is externally sleeved with a lock ring 116, the outer surface of the lock sleeve 115 is uniformly provided with lock teeth 125 along the circumferential direction, the inner surface of the lock ring 116 is protrudingly formed with teeth 126 matching with the lock teeth, and the teeth 126 are engaged with the lock teeth 125.

Example 2

Referring to fig. 7-11, the present embodiment provides a setting tool, which includes an outer fishing neck 213 and an inner mandrel 212 fixedly connected to the bottom end of the outer fishing neck 213, wherein a reversing mandrel 223 is sleeved outside the inner mandrel 212, a setting shaft 207 is fixedly sleeved outside the bottom of the reversing mandrel 223, the setting shaft 207 is cylindrical, and a feeding mandrel 201 is fixedly sleeved inside the bottom of the setting shaft 207; the second slip cage 227, the spring sleeve 215 and the reversing sleeve 218 are sequentially sleeved outside the reversing mandrel 223 from top to bottom, the bottom of the second slip cage 227 is sleeved outside the top of the spring sleeve 215 and is fixedly connected with the spring sleeve, the top of the reversing sleeve 218 is sleeved outside the bottom of the spring sleeve 215 and is fixedly connected with the spring sleeve, and the reversing sleeve 218 is in sliding fit with the reversing mandrel 223 along the axial direction of the reversing mandrel 223.

As shown in fig. 8, an elastic centralizer 221 is sleeved outside the spring housing 215, a top end of the elastic centralizer 221 is fixedly connected with the spring housing 215, a spring seat 216 is fixedly connected to a bottom end of the elastic centralizer 221, a pre-tightening spring 222 is sleeved outside the spring housing 215 and below the spring seat 216, an upper end and a lower end of the pre-tightening spring 222 are respectively abutted to a bottom surface of the spring seat 216 and a top surface of the reversing housing 218, and in a use state, the pre-tightening spring 222 is in a compressed state.

On the basis of the above embodiments, as shown in fig. 8 and fig. 11, a plurality of second slips 224 are uniformly arranged inside the second slip cage 227 along the circumferential direction of the second slip cage 227, the second slips 224 and the second slip cage 227 are in sliding fit along the axial direction of the second slip cage 227, a butting groove 225 is formed in the outer surface of the second slips 224, reset ribs 220 corresponding to the second slips 224 one to one are uniformly arranged on the outer circumferential wall of the second slip cage 227, one end of each reset rib 220 is fixedly connected with the second slip cage 227, and the other end of each reset rib 220 extends into the butting groove 225 and is butted with the inner wall of the butting groove 225.

As shown in fig. 10, an elastic claw 202 is slidably sleeved outside the feeding mandrel 201, the elastic claw 202 is cylindrical, and claw lobes are uniformly distributed at the bottom of the elastic claw 202; the side wall of the elastic claw 202 is provided with a copper pin 205 in a penetrating way, the outer surface of the feeding mandrel 201 is provided with a strip-shaped slot 226 along the axial direction, the inner end of the copper pin 205 is embedded in the slot 226, namely, the elastic claw 202 can slide along the slot 226 through the copper pin 205; run through on the lateral wall of elasticity claw 202 and seted up the through-hole, be equipped with clamping ring 203 and dog 204 in the through-hole, clamping ring 203 and through-hole inner wall welded fastening, the bottom of dog 204 and the convex ring platform butt of the surface that sends into dabber 201, the effect of ring platform is to avoid elasticity claw 202 to last downstream, plays spacing purpose.

As shown in fig. 8, a cone 214 is fixedly sleeved on the top outer side of the reversing mandrel 223, the cone 214 is cylindrical, the bottom end of the cone 214 is movably embedded into the inner side of the second slip cage 227, the bottom outer surface of the cone 214 is in a downward inclined plane shape, and the top inner surface of the second slip 224 is attached to the bottom outer surface of the cone 214.

As shown in fig. 9, the fixed sleeve of the outside of the setting shaft 207 is provided with a fixed cylinder 211 and a transmission sleeve 210, the bottom end of the setting shaft 207, which is located on the inner core shaft 212, is fixedly connected with an impact hammer 208, the outer surface of the impact hammer 208 is fixedly embedded with a setting key 209, a setting hole is formed through the side wall of the transmission sleeve 210, and the outer end of the setting key 209 penetrates through the setting shaft 207 and is movably embedded into the setting hole. The outside of the reversing mandrel 223 and the inner side of the reversing sleeve 218 are sleeved with a rotating pin fixing sleeve 217, a rotating pin hole is formed in the side wall of the rotating pin fixing sleeve 217 in a penetrating mode, a reversing pin 219 is movably embedded in the rotating pin hole, a reversing groove is formed in the outer surface of the reversing mandrel 223 along the axial direction, and the inner end of the reversing pin 219 is movably embedded in the reversing groove.

In the specific use process of the invention, the bridge plug in the embodiment 1 and the setting tool in the embodiment 2 need to be matched for use, and the specific use steps are as follows: .

Step 1, during setting, the elastic centralizer 221 rubs the inner wall of an oil pipe, and the reversing pin 219 reverses in the reversing mandrel 223 groove and enters the long groove from the short groove; then the running tool is driven downwards, the elastic centralizer 221 is kept still due to friction, the reversing mandrel 223 drives the cone 214 to move downwards, the action of the reset rib 220 is overcome, and the second slip 224 is radially expanded and anchored on the inner wall of the oil pipe; and then the downward hitting force is acted on the setting cylinder 120 of the bridge plug through the transmission sleeve 210 to shear the pin, and the compression setting of the rubber cylinder 109 and the setting and hanging action of the first slip 105 are completed.

Step 2: the feeding mandrel 201 moves upwards in the process of up-stroke by mechanically up-stroke releasing, the fishing head 121 moves downwards during setting to give way to the stop 204 at a radial expansion position, the stop 204 is pushed to move radially through the inclined surface, the feeding mandrel 201 continues to move upwards to cut off the pin, the elastic claw 202 is withdrawn from the supporting step of the feeding mandrel 201 to enter a concave position, the elastic claw 202 contracts and is withdrawn from the feeding barrel 119, and releasing action is completed.

And step 3: a recovery tool is put in, the mechanical downward striking is used for shearing the fixed pin of the sleeve opening 117, the downward striking is continued, the lock sleeve 115 moves upwards under the action of the downward striking force and the restoring force of the rubber cylinder 109, and the recovery lock ring 112 enters the groove on the mandrel 128; simultaneously, slips catch 111 also gets into in the 128 recesses of dabber, accomplishes first slips 105 and packing element 109 spacing, sets for once more when preventing to retrieve and sits to hang, accomplishes the bridging plug through fishing head 121 after the deblocking and retrieves.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a recoverable oil pipe bridging plug which characterized in that: the fishing device comprises a fishing head (121), a setting cylinder (120), a recovery cylinder (113), an upper cylinder sleeve (110), a rubber cylinder (109), a lower rubber cylinder sleeve (107), an anti-loosening cylinder (106), an upper cone (104), a first slip cage (103), a lower cone (102) and a guide shoe (101) which are sequentially connected end to end from top to bottom, wherein the setting cylinder (120) comprises a feeding cylinder (119), a locking sleeve seat (114) and a mandrel (128) which are sequentially connected end to end from top to bottom, the bottom end of the mandrel (128) sequentially penetrates through the recovery cylinder (113), the upper cylinder sleeve (110), the rubber cylinder (109), the lower rubber cylinder sleeve (107), the anti-loosening cylinder (106), the upper cone (104) and the first slip cage (103) and extends to the lower cone (102), and the bottom of the mandrel (128) is fixedly connected with the lower cone (102);

an unsealing sleeve (117) is fixedly arranged inside the lock sleeve seat (114), a lock sleeve (115) is sleeved outside the lock sleeve seat (114), a clamping groove (112) penetrates through the side wall of the lock sleeve seat (114), and an unsealing ring (118) is embedded in the clamping groove (112); evenly be provided with a plurality of first slips (105) along circumference in the inside of first slip cage (103), first slips (105) are the U style of calligraphy, the both ends of first slips (105) are all passed window on first slip cage (103), and a plurality of the common cover of outside of first slips (105) is equipped with chucking spring (122), and is a plurality of the inner wall of first slips (105) all with the surface laminating of dabber (128).

2. The retrievable tubing bridge plug of claim 1, wherein: the bottom of the anti-loosening cylinder (106) pass through the screw with go up cone (104) fixed connection, the top of the anti-loosening cylinder (106) with lower rubber sleeve cover (107) link to each other, the inside of the anti-loosening cylinder (106) is equipped with loosening spring (124), the upper and lower both ends of loosening spring (124) respectively with lower rubber sleeve cover (107) and the protruding annular shoulder (123) butt that is of anti-loosening cylinder (106) inner wall.

3. The retrievable tubing bridge plug of claim 1, wherein: the inner wall of the anti-loosening cylinder (106) is provided with an annular movable groove, a slip locking ring (111) is arranged inside the movable groove, and the slip locking ring (111) is movably sleeved outside the mandrel (128).

4. The retrievable tubing bridge plug of claim 1, wherein: sealing pistons (108) are arranged inside the lower rubber sleeve (107) and the upper rubber sleeve (110), the two sealing pistons (108) are abutted against the end face of the rubber sleeve (109), and the inner ring of each sealing piston (108) is attached to the outer surface of the mandrel (128); the inner walls of the lower rubber cylinder sleeve (107) and the upper rubber cylinder sleeve (110) are both provided with anti-rotation lock pins (127), and the outer surface of the sealing piston (108) is provided with lock pin holes matched with the anti-rotation lock pins (127).

5. The retrievable tubing bridge plug of claim 1, wherein: the lock sleeve is characterized in that a lock ring (116) is sleeved outside the lock sleeve (115), lock teeth (125) are uniformly arranged on the outer surface of the lock sleeve (115) along the circumferential direction, teeth (126) matched with the lock teeth are formed on the inner surface of the lock ring (116) in a protruding mode, and the teeth (126) are meshed with the lock teeth (125).

6. A setting tool, characterized in that: the fishing device comprises an outer fishing neck (213) and an inner mandrel (212) fixedly connected to the bottom end of the outer fishing neck (213), wherein a reversing mandrel (223) is sleeved outside the inner mandrel (212), a setting shaft (207) is fixedly sleeved on the outer side of the bottom of the reversing mandrel (223), the setting shaft (207) is cylindrical, and a feeding mandrel (201) is fixedly sleeved on the inner side of the bottom of the setting shaft (207); the reversing core shaft (223) is sequentially sleeved with a second slip cage (227), a spring sleeve (215) and a reversing sleeve (218) from top to bottom, the bottom of the second slip cage (227) is sleeved outside the top of the spring sleeve (215) and fixedly connected with the spring sleeve, the top of the reversing sleeve (218) is sleeved outside the bottom of the spring sleeve (215) and fixedly connected with the spring sleeve, and the reversing sleeve (218) is in sliding fit with the reversing core shaft (223) along the axial direction of the reversing core shaft (223);

an elastic centralizer (221) is sleeved outside the spring sleeve (215), the top end of the elastic centralizer (221) is fixedly connected with the spring sleeve (215), a spring seat (216) is fixedly connected to the bottom end of the elastic centralizer (221), a pre-tightening spring (222) is sleeved outside the spring sleeve (215) and below the spring seat (216), and the upper end and the lower end of the pre-tightening spring (222) are respectively abutted to the bottom surface of the spring seat (216) and the top surface of the reversing sleeve (218);

the inside of second slips cage (227) evenly is provided with a plurality of second slips (224) of quantity along the circumference of second slips cage (227), second slips (224) with along the axis direction sliding fit of second slips cage (227) between second slips cage (227), butt joint groove (225) has been seted up to the surface of second slips (224), the periphery wall of second slips cage (227) evenly be provided with the muscle (220) that resets of second slips (224) one-to-one, the one end of muscle (220) that resets with second slips cage (227) fixed connection, the other end of muscle (220) that resets extends to in butt joint groove (225) and with the inner wall laminating of butt joint groove (225).

7. A setting tool according to claim 6, wherein: the feeding mandrel (201) is sleeved with an elastic claw (202) in a sliding mode, the elastic claw (202) is cylindrical, and claw petals are uniformly distributed at the bottom of the elastic claw (202); a copper pin (205) penetrates through the side wall of the elastic claw (202), a strip-shaped slotted hole (226) is formed in the outer surface of the feeding mandrel (201) along the axial direction, and the inner end of the copper pin (205) is embedded into the slotted hole (226); run through on the lateral wall of elasticity claw (202) and seted up the through-hole, be equipped with clamping ring (203) and dog (204) in the through-hole, clamping ring (203) with through-hole inner wall welded fastening, the bottom of dog (204) with send into the convex ring platform butt of surface of dabber (201).

8. A setting tool according to claim 6, wherein: the fixed cone (214) that is equipped with of top outside of switching-over dabber (223), cone (214) are the cylinder, the bottom activity of cone (214) is embedded into the inboard of second slips cage (227), just the bottom surface of cone (214) is the inclined plane form of downward sloping, the top internal surface of second slips (224) with the laminating of the bottom surface of cone (214).

9. A setting tool according to claim 6, wherein: the fixed cover in outside of sitting seal axle (207) is equipped with fixed section of thick bamboo (211) and transmission cover (210), the bottom fixedly connected with jump bit (208) that the inside of sitting seal axle (207) just is located interior core axle (212), the surface of jump bit (208) is embedded to have a seat key (209), run through on the lateral wall of transmission cover (210) and seted up the seat hole, the outer end of seat key (209) passes sitting seal axle (207) and activity is embedded into in the seat hole.

10. A setting tool according to claim 6, wherein: the outside of switching-over dabber (223) just is located the inboard cover of switching-over cover (218) is equipped with and changes the fixed cover of round pin (217), it has seted up the commentaries on classics pinhole to run through on the lateral wall of the fixed cover of round pin (217), the inside activity embedding in commentaries on classics pinhole has switching-over round pin (219), the switching-over groove has been seted up along the axial to the surface of switching-over dabber (223), the inner activity embedding of switching-over round pin (219) is in the switching-over inslot.