CN210152598U

CN210152598U - Oil pipe plug

Info

Publication number: CN210152598U
Application number: CN201920852835.8U
Authority: CN
Inventors: 陈建党; 张守琼; 邱琳琳; 左鸿图; 杨树海; 李东明
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-03-17
Anticipated expiration: 2029-06-06

Abstract

The utility model provides an oil pipe blanking plug. The slip comprises a slip body, the lower end of the slip body is fixedly connected with a lock rod, the lower end of the lock rod is provided with a locking tooth joint and a lock cap which is movably sleeved on the locking tooth joint upwards, a compression rubber cylinder which is arranged below the slip body and above the lock cap is sleeved on the lock rod, the upper end of the lock cap is provided with a through hole for the locking tooth joint to penetrate downwards, the hole wall of the through hole is provided with an annular groove, a lock ring is arranged in the annular groove, the center of the lock ring is provided with a lock hole for the locking tooth joint to insert, the outer peripheral surface of the locking tooth joint and the hole wall surface of the lock hole of the lock ring are correspondingly provided with an agnail matching structure which can only move oppositely and block in the opposite direction, when the oil pipe stopper is in setting, high-pressure liquid can be injected into an oil pipe to realize radial outward expansion of the compression rubber cylinder, the locking matching of the lock rod and the, the structure of the tubing plug is also relatively simple.

Description

Oil pipe plug

Technical Field

The utility model relates to an oil pipe blanking plug is the downhole tool that oil gas field development was used, belongs to borehole operation workover tool technical field, is particularly useful for the oil pipe blanking plug of the shutoff in the snubbing serving process oil pipe.

Background

In the well repairing process of an oil-water well in an oil field, shaft fluid can be sprayed out of the ground through an oil pipe by bottom hole pressure to cause an environmental pollution event, well killing is carried out or no-well killing equipment is used for blocking the oil pipe in the conventional method, the well killing method cannot be adopted as much as possible due to the fact that construction cost is increased and stratum pollution is caused, and if no-well killing equipment is used for well repairing, the problem of blocking in the oil pipe must be solved.

Chinese utility model patent with the publication number of grant CN201730585U discloses a cooperation well head annular space sealing device and ground control system accomplish sealed well head pressure, carry out the inflatable oil pipe blanking plug of the area pressure operation that has downhole tool tubular column to reach the purpose that reduces the stratum pollution, preserves the stratum energy, protects the ground environment. The oil pipe blanking plug comprises a slip part, wherein the slip part comprises a pull rod, a slip seat, a sliding block slip and a shearing pin, an inclined dovetail groove is formed in the outer wall of the slip seat, the sliding block slip is arranged on the dovetail groove, the shearing pin is arranged between the pull rod and the slip seat, the pull rod and the slip seat are fixed together through the shearing pin, and an inflation joint is arranged above the slip seat.

The sealing part of the oil pipe plug comprises a rubber sleeve, a spacer ring and a pull rod locking cap, the rubber sleeve is sleeved on the outer wall of a pull rod, the spacer ring is arranged between the two rubber sleeves, the rubber sleeve and the spacer ring are arranged below a slip seat, the pull rod locking cap is fixed at the lower end of the pull rod through threads, and the rubber sleeve and the spacer ring are tightly pressed by the pull rod locking cap. After the inflatable oil pipe plug is in place, the pull rod lock cap impacts the underground preset seat, the pull rod is pushed to move upwards and cut off the shearing pin, the piston rod and the pull rod are driven to move upwards by the high-pressure nitrogen in the air cavity, the rubber cylinder is compressed to seal the oil pipe, the oil pipe gate is opened slowly at the moment, and if the oil pipe does not overflow, the inflatable oil pipe plug is successfully seated. If the setting is unsuccessful, the well is closed to suppress pressure or the oil pipe is suppressed to cut the shearing pin, and the setting can be finished in the same way.

That is to say, only through the mode compression packing element that the high pressure nitrogen gas in the gas chamber promoted the piston and drives the pull rod upward movement and make the packing element take place the mode of radial expansion and have unreliable factor, leak in advance at the in-process that oil pipe blanking plug moved down when high pressure nitrogen gas, just can not make the pull rod rebound through high pressure nitrogen gas, consequently, need seal oil pipe through opening the oil pipe gate to the packing element and test, if unsuccessful, still need take other modes to realize the seat of oil pipe blanking plug and seal. Therefore, the process of completing setting of the tubing plug is complicated, and the whole tubing plug is complicated in structure due to the need of providing a gas chamber for filling high-pressure nitrogen.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oil pipe plug to solve among the prior art oil pipe plug and set up the technical problem that the process is loaded down with trivial details, oil pipe plug structure is complicated.

In order to achieve the above object, the utility model discloses oil pipe plug's technical scheme is: the oil pipe plug comprises a slip body and an upper joint arranged above the slip body, wherein the slip body is provided with a locking mechanism, the locking mechanism comprises a dovetail groove arranged on the radial outer side of the slip body and a one-way slip assembled in the dovetail groove in a guiding and moving way, the one-way slip can be anchored with the inner wall of an oil pipe when moving to the lower end of the dovetail groove, the lower end of the slip body is fixedly connected with a lock rod, the lower end of the lock rod is provided with a locking tooth joint and a lock cap which is movably sleeved on the locking tooth joint upwards, a compression rubber cylinder which is positioned below the slip body and above the lock cap is sleeved on the lock rod, the lower end of the lock cap is provided with a supporting end surface which is used for supporting a bearing seat in the oil pipe, a supporting structure which is used for supporting the compression rubber cylinder is arranged between the upper end of the lock cap and the compression rubber cylinder, and a jacking structure which is used for jacking the compression rubber cylinder downwards when the slip body moves downwards is correspondingly arranged; the upper end of the lock cap is provided with a through hole for the lock tooth joint to penetrate downwards, the hole wall of the through hole is provided with an annular groove, a lock ring is assembled in the annular groove, the center of the lock ring is provided with a lock hole for the lock tooth joint to be inserted into, the annular groove comprises an upper blocking edge, a lower blocking edge and a side wall for connecting the upper blocking edge and the lower blocking edge, the upper blocking edge is used for forming blocking matching with the lock ring so as to prevent the lock ring from jumping out of the lock cap upwards, the bottom surface of the lock cap forms the lower blocking edge for preventing the lock ring from moving downwards, and barb matching structures which can only move towards each other and block in opposite directions are correspondingly arranged on the outer peripheral surface of the lock tooth joint.

The utility model has the advantages of: in the well repairing process of an oil-water well, after the oil pipe plug reaches the bearing position in an oil pipe, the oil pipe plug stops moving downwards, a pump truck is connected to inject high-pressure liquid into the oil pipe, a lock rod on a slip body can move downwards relative to a lock cap, at the moment, a compression rubber cylinder located below the slip and above the lock cap can expand radially outwards under the combined action of a jacking structure at the lower end of the slip and a supporting structure at the upper end of the lock cap, so that the compression rubber cylinder seals the oil pipe, a lock tooth joint is arranged at the lower end of the lock rod, an annular groove matched with the lock rod is arranged on the lock cap, and the outer peripheral surface of the lock tooth joint and the wall surface of a lock hole of the lock ring can be locked relatively due to the arranged barb matching structure. Therefore, the utility model provides an oil pipe plug injects high-pressure liquid just can realize compressing the radial outside inflation of packing element in oil pipe when setting, and need not to seal the packing element through opening the oil pipe gate and test oil pipe, and the setting process is simple reliable to, owing to need not to set up the structure that is used for making compressing the radial outside inflation of packing element, the structure of oil pipe plug is also simple relatively.

Furthermore, the barb matching structure is an upper cusp structure with upward tips arranged on the peripheral surface of the locking tooth joint from top to bottom and a lower cusp structure with downward tips arranged on the hole wall surface of the locking hole of the locking ring from bottom to top; the locking ring is a C-shaped elastic cylinder, the inner wall surface of the elastic cylinder is provided with a lower tooth point structure, the locking ring enters the annular groove through a through hole on the locking cap by radial elastic contraction, and the outer wall surface of the locking ring is tightly matched with the side wall of the annular groove by radial expansion after entering the annular groove; by adopting the locking ring with the structure, the process that the locking ring enters the locking cap ring groove is simpler.

Furthermore, the supporting structure is a lower spacer ring which is sleeved on the lock rod and is positioned between the compression rubber cylinder and the lock cap, and the jacking structure is an upper spacer ring which is sleeved on the lock rod and is positioned between the compression rubber cylinder and the slip body, so that the compression rubber cylinder is more wear-resistant, and the replacement of the upper spacer ring and the lower spacer ring is facilitated.

Furthermore, an upper leather cup rubber cylinder and a lower leather cup rubber cylinder are sleeved between the slip body and the upper joint through a center rod; a tubing plug is provided for reaching a seat position in a tubing by injecting high pressure fluid into the tubing.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the middle oil pipe plug of the present invention;

FIG. 2 is a schematic view of the mating structure of the locking rod, locking ring and locking cap of FIG. 1.

In the figure: 1-upper joint, 2-center rod, 3-upper leather cup rubber cylinder, 4-lower leather cup rubber cylinder, 5-slip body, 6-one-way slip, 7-stop key, 8-upper spacing ring, 9-lower spacing ring, 10-compression rubber cylinder, 11-locking rod, 12-locking ring, 13-locking cap, 131-perforation, 132-annular groove, 133-upper stop edge and 134-lower stop edge.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

The first embodiment of the oil pipe plug of the present invention, as shown in fig. 1, includes a slip body 5 and an upper joint 1 disposed above the slip body 5, wherein an upper leather cup packing element 3 and a lower leather cup packing element 4 are sleeved between the slip body 5 and the upper joint 1 through a central rod 2; the slip body 5 is further provided with a locking mechanism, the locking mechanism comprises a dovetail groove formed in the radial outer side of the slip body 5 and a one-way slip 6 assembled in the dovetail groove in a guiding and moving mode, a stop key 7 used for being matched with the one-way slip 6 in a stop mode is arranged at the lower end of the dovetail groove, and when the one-way slip 6 moves to the lower end of the dovetail groove, the one-way slip can be anchored with the inner wall of an oil pipe, so that the oil pipe plug is prevented from moving upwards.

The lower end of the slip body 5 is in threaded connection with a lock rod 11, the lower end of the lock rod 11 is provided with a lock tooth joint with an upper tooth tip structure, the lower end of the lock rod 11 is provided with a lock cap 13 which is movably sleeved on the lock tooth joint upwards, the lock rod 11 is sleeved with a compression rubber cylinder 10 which is positioned below the slip body 5 and above the lock cap, and the lower end of the lock cap 13 is provided with a supporting end surface which is used for supporting a bearing seat in an oil pipe; and a supporting structure for supporting the compression rubber barrel 10 is arranged between the upper end of the lock cap 13 and the compression rubber barrel 10, a jacking structure for jacking the compression rubber barrel 10 downwards when the slip body 5 descends is correspondingly arranged between the lower end of the slip body 5 and the compression rubber barrel 10, the supporting structure is a lower spacer ring 9 sleeved on the lock rod 11, and the jacking structure is an upper spacer ring 8 sleeved on the lock rod.

As shown in fig. 2, a through hole 131 for the locking tooth joint to penetrate downwards is formed at the upper end of the lock cap 13, an annular groove 132 is formed on the hole wall of the through hole 131, a lock ring 12 is assembled in the annular groove 132, and a lock hole for the locking tooth joint to be inserted into is formed in the center of the lock ring 12; the ring groove 132 comprises an upper blocking edge 133, a lower blocking edge 134 and a side wall connecting the upper blocking edge 133 and the lower blocking edge 134, the upper blocking edge 133 can form blocking fit with the locking ring so as to prevent the locking ring from moving upwards out of the locking cap 13, and the bottom surface of the locking cap 13 forms the lower blocking edge 134 which prevents the locking ring from moving downwards; the locking ring 12 is a C-shaped elastic cylinder, the inner wall surface of the elastic cylinder is provided with a lower tooth tip structure, the locking ring 12 enters the annular groove 132 through the through hole 131 on the locking cap 13 by radial elastic contraction, and the outer wall surface of the locking ring 12 is tightly matched with the side wall of the annular groove 132 by radial expansion after entering the annular groove 132. And barb matching structures which can only move in opposite directions and are blocked in opposite directions are correspondingly arranged on the peripheral surface of the lock tooth joint and the wall surface of the lock hole of the lock ring 12, and the barb matching structures are an upper tooth tip structure with upward tips arranged on the peripheral surface of the lock tooth joint from bottom to top and a lower tooth tip structure with downward tips arranged on the wall surface of the lock hole of the lock ring from bottom to top.

In the embodiment, when the oil pipe well is repaired and used, the oil pipe plug is put into the oil pipe, the pump truck is connected to inject high-pressure liquid such as water into the oil pipe, the high-pressure liquid acts on the upper leather cup rubber cylinder 3 of the oil pipe plug to enable the upper leather cup rubber cylinder 3 to contract radially inwards, so that the high-pressure liquid acts on the lower leather cup rubber cylinder 4 to push the oil pipe plug to descend to the supporting end face of the bearing seat in the oil pipe, the oil pipe plug cannot move downwards continuously due to the supporting effect of the supporting end face of the bearing seat, the high-pressure liquid is continuously injected into the oil pipe to continuously apply pressure to the oil pipe plug, the lock rod 11 in the oil pipe plug descends relative to the lock cap 13 to compress the compression rubber cylinder 10 between the slip body 5 and the lock cap, the compression rubber cylinder 10 expands radially to seal with the oil pipe, the upper leather cup rubber cylinder 3 expands radially outwards under the sealing pressure effect in the lower well, thereby realizing sealing with the inner wall surface of the oil pipe and completing setting. The radial expansion of the compression rubber cylinder 10 is realized by compressing the tubing plug downwards by high-pressure liquid injected into the tubing cylinder so that the vertical distance between the slip body 5 and the lock cap 13 is reduced, namely, as long as after the tubing plug moves to the bearing position, the high-pressure liquid is continuously injected into the oil pipe, the compression rubber cylinder 10 can be ensured to expand radially outwards, thereby realizing the sealing between the compression rubber cylinder 10 and the inner wall of the oil pipe, thereby completing the setting of the oil pipe plug without testing whether the oil pipe plug is sealed with the inner wall of the oil pipe or not, leading the whole setting process of the oil pipe plug to be simpler and more reliable, and in addition, since the sealing of the compression rubber sleeve 10 of the oil pipe plug with the oil pipe is realized by injecting high-pressure liquid into the oil pipe, and an additional structure for expanding the compression rubber cylinder outwards is not needed, so that the structure of the oil pipe plug is simpler.

When the lock rod 11 in the tubing plug descends relative to the lock cap 13, the lock tooth joint at the lower end of the lock rod 11 moves downwards relative to the lock cap and is in locking fit with the lower tooth tip structure on the inner wall surface of the lock ring in the lock cap 13, so that the locking fit between the lock rod 11 and the lock cap 13 is more reliable.

The utility model discloses a specific embodiment two of oil pipe blanking plug: the difference from the first embodiment is that: the central rod 2 can be also not sleeved with an upper leather cup rubber cylinder 3 and a lower leather cup rubber cylinder 4 between the slip body 5 and the upper joint 1, so that the oil pipe plug can move downwards without injecting high-pressure liquid into an oil pipe, and can fall into a well through self gravity for the inflatable oil pipe plug in the background technology. The upper spacer ring 8 between the slip body 5 and the compression rubber cylinder 10 and the lower spacer ring 9 between the compression rubber cylinder 10 and the locking cap 13 may not be provided. The locking rod can be connected with the slip body in a mode of not being connected through threads, for example, a welding mode can be adopted, and requirements can be met as long as the locking rod can be fixedly connected with the slip body.

The foregoing is merely an illustrative embodiment of the present invention, and is not intended to limit the scope of the invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims

1. Oil pipe blanking plug, including slips body and the top connection of setting in slips body top, be provided with locking mechanism on the slips body, locking mechanism removes the one-way slips of assembly in the dovetail including seting up the dovetail in the radial outside of slips body and direction, can be with oil pipe inner wall anchoring when one-way slips removes the lower extreme to the dovetail, its characterized in that: the lower end of the slip body is fixedly connected with a lock rod, the lower end of the lock rod is provided with a locking tooth joint and a lock cap which is movably sleeved on the locking tooth joint upwards, a compression rubber cylinder which is positioned below the slip body and above the lock cap is sleeved on the lock rod, the lower end of the lock cap is provided with a supporting end surface which is used for supporting a bearing seat in an oil pipe, a supporting structure which is used for supporting the compression rubber cylinder is arranged between the upper end of the lock cap and the compression rubber cylinder, and a jacking structure which is used for jacking the compression rubber cylinder downwards when the slip body descends is correspondingly arranged between the lower end of the slip body and the compression rubber cylinder; the upper end of the lock cap is provided with a through hole for the lock tooth joint to penetrate downwards, the hole wall of the through hole is provided with an annular groove, a lock ring is assembled in the annular groove, the center of the lock ring is provided with a lock hole for the lock tooth joint to be inserted into, the annular groove comprises an upper blocking edge, a lower blocking edge and a side wall for connecting the upper blocking edge and the lower blocking edge, the upper blocking edge is used for forming blocking matching with the lock ring so as to prevent the lock ring from jumping out of the lock cap upwards, the bottom surface of the lock cap forms the lower blocking edge for preventing the lock ring from moving downwards, and barb matching structures which can only move towards each other and block in opposite directions are correspondingly arranged on the outer peripheral surface of the lock tooth joint.

2. The tubing plug of claim 1, wherein: the barb matching structure is an upper cusp structure with upward tips arranged on the peripheral surface of the locking tooth joint from top to bottom and a lower cusp structure with downward tips arranged on the hole wall surface of the locking hole of the locking ring from bottom to top; the locking ring is a C-shaped elastic cylinder, the inner wall surface of the elastic cylinder is provided with a lower tooth point structure, the locking ring enters the annular groove through a through hole in the locking cap by radial elastic contraction, and the outer wall surface of the locking ring is tightly matched with the side wall of the annular groove by radial expansion after entering the annular groove.

3. Tubing plug according to claim 1 or 2, wherein: the supporting structure is a lower spacer ring sleeved on the lock rod, and the jacking structure is an upper spacer ring sleeved on the lock rod.

4. The tubing plug of claim 1, wherein: an upper leather cup rubber cylinder and a lower leather cup rubber cylinder are sleeved between the slip body and the upper joint through a center rod.