CN216406748U

CN216406748U - Releasing device

Info

Publication number: CN216406748U
Application number: CN202123171436.1U
Authority: CN
Inventors: 张岩; 张福祥; 李志斌; 胡强
Original assignee: Zhouji Strait Energy Technology Co ltd
Current assignee: Zhouji Strait Energy Technology Co ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-04-29
Anticipated expiration: 2031-12-16

Abstract

The utility model relates to a releasing device which comprises an outer pipe, a sliding rod and a ball seat, wherein the lower end of the outer pipe is provided with a plurality of elastic claws, a slit is formed between every two adjacent elastic claws, the outer wall of each elastic claw is provided with an external thread, and the inner wall of the outer pipe is provided with a first limiting step. The slide bar can wear to establish in the outer tube axially sliding, and the upper end and the lower extreme of slide bar are equipped with protruding ring sum lower bulge loop outward respectively, and first spacing step is located the below of protruding ring down to can be to protruding ring axial spacing. The lower convex ring can be propped against each elastic claw and can prop open each elastic claw, so that the external thread on each elastic claw can be matched with a female buckle. The ball seat is arranged in the outer tube in a penetrating mode and located above the sliding rod, and the ball seat can push the sliding rod to move downwards until the lower convex ring extends out of the outer tube, so that the elastic claws can contract inwards. The releasing device disclosed by the utility model is simple in structure and convenient to release, the joint of a pipe column in a well cannot be damaged, and the releasing device does not have any metal retention in a shaft after releasing.

Description

Releasing device

Technical Field

The utility model relates to the technical field of releasing tools, in particular to a releasing device.

Background

The existing releasing device has the defects of complex structure, difficult releasing, easy damage to the joint of a well pipe column, easy metal retention in a shaft and the like.

Therefore, the inventor provides a releasing device by virtue of experience and practice of related industries for many years so as to overcome the defects of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a releasing device which is simple in structure, convenient to release and free of damage to a joint of a tubular column in a well, and the releasing device is free of any metal retention in a shaft after releasing.

The object of the utility model is achieved in that a releasing device comprises:

the lower end of the outer pipe is provided with a plurality of elastic claws, a slit is formed between every two adjacent elastic claws, the slit extends downwards to the lower end of the outer pipe, and the outer wall of each elastic claw is provided with an external thread; the inner wall of the outer pipe is provided with a first limiting step;

the sliding rod can axially and slidably penetrate through the outer tube, an upper convex ring and a lower convex ring are respectively arranged at the upper end and the lower end of the sliding rod in an outward protruding mode, and the first limiting step is located below the lower convex ring and can axially limit the upper convex ring; the lower convex ring can be abutted against each elastic claw and can prop open each elastic claw, so that the external thread on each elastic claw can be matched with a female buckle;

and the ball seat is arranged in the outer tube in a penetrating manner and is positioned above the sliding rod, and the ball seat can push the sliding rod to move downwards until the lower convex ring extends out of the outer tube, so that each elastic claw can contract inwards.

In a preferred embodiment of the utility model, the slide rod has a central passage extending through both ends thereof.

In a preferred embodiment of the present invention, a compression spring is further sleeved on the sliding rod, and two ends of the compression spring respectively abut against the first limiting step and the upper convex ring.

In a preferred embodiment of the present invention, a check valve is further provided between the sliding rod and the ball seat.

In a preferred embodiment of the present invention, the ball seat is an annular structure having a central hole, and a plurality of through holes are formed on the annular structure and around the central hole.

In a preferred embodiment of the present invention, at least one ring of ring grooves is formed on the outer wall of the lower portion of the outer pipe and above the external threads, and at least one slit extends upward to the position of the ring groove at the top.

In a preferred embodiment of the present invention, the outer tube is provided with a plurality of ring grooves, the plurality of slots include a plurality of first slots and a plurality of second slots, the first slots extend upward to the position of the ring groove at the top, and the second slots extend upward to the top end of the external thread.

In a preferred embodiment of the present invention, the slide bar includes an upper slide bar and a lower slide bar fixed up and down, the upper convex ring is formed at an upper end of the upper slide bar, and the lower convex ring is formed at a lower end of the lower slide bar.

In a preferred embodiment of the utility model, the outer tube comprises a conversion connecting tube and an outer tube which are fixed up and down, a second limit step is formed on the inner wall of the outer tube, an inner tube penetrates through the outer tube and is positioned between the conversion connecting tube and the second limit step, and the lower end of the inner tube can abut against the second limit step; the elastic claw is formed on the outer cylinder, the first limiting step is formed on the inner cylinder, and the ball seat and the upper part of the upper sliding rod are both positioned in the inner cylinder.

In a preferred embodiment of the present invention, the outer wall of the lower end of the upper sliding rod is in threaded connection with the inner wall of the upper end of the lower sliding rod, and the outer wall of the lower end of the conversion adapter is in threaded connection with the inner wall of the upper end of the outer cylinder.

Therefore, the releasing device is simple in structure and convenient to process. The elastic claws are spread by utilizing a lower convex ring on the slide bar, so that the releasing device can be matched and connected with the female buckle of the pipe string to be released; after the ball is thrown and pressed, the ball seat is used for pushing the slide rod to move downwards, the lower convex ring can be ejected out of the outer barrel, each elastic claw automatically contracts and is separated from the female buckle of the pipe string to be released, the releasing is realized, and the releasing operation is simple. The split male buckle is separated from the female buckle of the pipe string to be released in a contracting mode, the female buckle of the pipe string to be released cannot be damaged, and therefore the joint of the pipe string in the well cannot be damaged; meanwhile, the sliding rod can be limited by the aid of the first limiting step, all parts of the releasing tool can be completely lifted, the releasing device is free of any metal retention in a shaft, and other subsequent construction devices cannot be damaged.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1: the structure of the releasing device provided by the utility model is schematically shown.

FIG. 2: the utility model provides a schematic structural diagram of a lower sliding rod.

FIG. 3: the utility model provides a structural schematic diagram of an outer barrel.

FIG. 4: the utility model provides a bottom view of an outer cylinder.

FIG. 5: is a schematic structural diagram of the inner cylinder provided by the utility model.

FIG. 6: the structure of the check valve is shown schematically.

FIG. 7: is a structural schematic diagram of the ball seat provided by the utility model.

The reference numbers illustrate:

1. an outer tube; 11. switching over the adapter; 12. an outer cylinder; 121. slotting; 122. a ring groove; 123. a second limit step; 13. an inner barrel; 131. a first limit step;

2. a slide bar; 21. a sliding rod is arranged; 211. an upper convex ring; 212. an upper liquid passing hole; 22. a lower sliding rod; 221. a lower convex ring; 222. a lower liquid passing hole;

3. a compression spring;

4. a check valve;

5. a ball seat; 51. a central bore; 52. a through hole;

6. and (5) steel balls.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

As shown in fig. 1 to 7, the present embodiment provides a releasing device, including:

the lower end of the outer pipe 1 is provided with a plurality of elastic claws, a slit 121 is formed between every two adjacent elastic claws, the slit 121 extends downwards to the lower end of the outer pipe 1, and the outer wall of each elastic claw is provided with an external thread; the inner wall of the outer tube 1 is provided with a first limit step 131;

the sliding rod 2 is axially slidably arranged in the outer tube 1 in a penetrating manner, the upper end and the lower end of the sliding rod 2 are respectively provided with an upper convex ring 211 and a lower convex ring 221 in an outward protruding manner, and the first limiting step 131 is positioned below the lower convex ring 221 and can axially limit the upper convex ring 211; the lower convex ring 221 can be abutted against each elastic claw and can prop open each elastic claw, so that the external thread on each elastic claw can be matched with a female buckle;

and a ball seat 5 penetrating the outer tube 1 and located above the sliding rod 2, wherein the ball seat 5 can push the sliding rod 2 to move downwards until the lower convex ring 221 extends out of the outer tube 1, so that each elastic claw can contract inwards.

The external threads on the elastic claws form a split pin, the number of the elastic claws can be determined according to the requirement, for example, as shown in fig. 4, eight elastic claws are provided in the embodiment, and eight slots 121 are formed in the same shape. When in processing, all the elastic claws are bent towards the inside of the outer tube 1; that is, under the state of no external force, all elastic claws all contract inwards, and the split type pin buckle is in a contracted state. After the sliding rod 2 and the ball seat 5 are both installed in the outer tube 1, the lower convex ring 221 at the lower end of the sliding rod 2 can prop open each elastic claw, so that the split pin can be matched with a female buckle thread. After the releasing device is assembled, the drilling tool is connected to the upper end of the outer pipe 1, the split type male buckle at the lower end of the outer pipe 1 is in threaded connection with the female buckle of the pipe string to be released, and the pipe string to be released can be lowered into the well through the drilling tool and the releasing device to be in a preset position.

When needing to give up, drop into steel ball 6 in to the tubular column, steel ball 6 is located on ball seat 5, and the back steel ball 6 that suppresses promotes ball seat 5 and slide bar 2 and goes down to lower bulge loop 221 simultaneously and stretch out outer tube 1, and each elastic claw loses the support of bulge loop 221 and can automatic inwards contract (also split type pin thread shrink) this moment, just can with the box separation of waiting to give up the tubular string, realizes giving up. Due to the axial limitation of the upper convex ring 211 by the first limiting step 131, the sliding rod 2 does not break away from the outer cylinder 12 and can be lifted together with the releasing device. The whole releasing device is a ball throwing type releasing tool, can be used in an oil drilling pipe column, realizes the separation of a downhole pipe column into two parts, and retains one part in a well. The releasing device can be particularly applied to wells of some special well completion processes, such as coal bed gas multi-branch horizontal wells, when the glass fiber reinforced plastic sieve tube needs to be put in each branch, after the glass fiber reinforced plastic sieve tube is conveyed by a drilling tool in place, the glass fiber reinforced plastic sieve tube can be separated from the releasing device, the releasing device does not have any detention, and no metal is retained in a well bore; the corresponding coal digging device can not be damaged during the subsequent coal digging operation.

Therefore, the releasing device in the embodiment is simple in structure and convenient to process. The elastic claws are spread by using a lower convex ring 221 on the slide bar 2, so that the releasing device can be matched and connected with the female buckle of the pipe string to be released; after the ball is thrown and pressed, the ball seat 5 is used for pushing the slide rod 2 to move downwards, the lower convex ring 221 can be ejected out of the outer cylinder 12, each elastic claw automatically contracts and is separated from the female buckle of the pipe string to be released, releasing is realized, and releasing operation is simple. The split male buckle is separated from the female buckle of the pipe string to be released in a contracting mode, the female buckle of the pipe string to be released cannot be damaged, and therefore the joint of the pipe string in the well cannot be damaged; meanwhile, the first limiting step 131 can limit the sliding rod 2, all parts of the releasing tool can be completely lifted, and the releasing device is free of any metal retention in a shaft and cannot damage other follow-up construction devices.

In a particular implementation, the slide bar 2 has a central channel running through both ends thereof. After the pipe string to be released is put into the preset position in the well through the drilling tool and the releasing device, corresponding circular well washing operation can be carried out by utilizing the central channel.

Further, a compression spring 3 is further sleeved on the sliding rod 2, and two ends of the compression spring 3 respectively abut against the first limit step 131 and the upper convex ring 211.

When the lower convex ring 221 abuts against each elastic claw and stretches each elastic claw, the acting force between the lower convex ring 221 and the elastic claws is relatively large, and the position of the lower convex ring 221 can be kept fixed before the ball is thrown and pressed, so that the phenomenon of releasing hands in advance can not occur. After the compression spring 3 is arranged, on one hand, the elastic force of the compression spring 3 is utilized to provide upward pushing force for the slide rod 2, so that the position stability of the slide rod 2 can be ensured, and the phenomenon that the slide rod 2 moves down in advance due to overlarge fluid pressure during operation such as circulating well flushing and the like to cause early release is further avoided; on the other hand, after the ball is thrown and pressed and the lower convex ring 221 is extended out of the outer tube 1, the upper end face of the lower convex ring 221 can be abutted against the bottom end of the contracted elastic claw under the action of the compression spring 3, the sliding rod 2 cannot shake, and the structure is more stable.

In an alternative embodiment, as shown in fig. 1 and 6, a check valve 4 is further provided between the slide rod 2 and the ball seat 5.

When installed, the check valve 4 is placed over the slide rod 2 and the ball seat 5 is placed over the check valve 4. After the ball is thrown and pressed, the ball seat 5 can sequentially push the check valve 4 and the slide rod 2, so that the slide rod 2 moves downwards. The check valve 4 is a one-way valve, and can adopt any one-way valve structure in the prior art, and only allows liquid to flow in one direction from top to bottom. When the check valve is applied to a pipe column with a sieve pipe, in the process of running the pipe column, the check valve 4 can effectively prevent impurities such as rock debris outside the pipe column from entering the releasing device after the impurities enter the pipe column through the sieve pipe, and the phenomenon that the sliding rod 2 moves downwards due to the clamping and the like in the releasing device is avoided.

Referring to fig. 7, the ball seat 5 is a ring structure having a central hole 51, and the inner wall thereof forms a conical surface to better support the steel ball 6; a plurality of through holes 52 are also typically provided in the annular structure and around the central bore 51. After the ball is thrown, the steel ball 6 blocks the central hole 51, and the existence of the through hole 52 can not influence the pushing of the sliding rod 2 to move downwards; meanwhile, after the through hole 52 is formed, when a pump is started to perform pressure, the pressure building cannot be serious, and the construction safety can be ensured; and when the releasing device is prepared to be lifted up after releasing, if the releasing device is not easy to lift up, the through hole 52 can be used for circularly flushing the well, so that the releasing device can be lifted up smoothly.

Further, in order to make each elastic claw more easily contract after the shot is pressed, as shown in fig. 1 and 3, at least one ring of ring groove 122 is provided on the lower outer wall of the outer tube 1 above the external thread, and at least one slit 121 extends upward to the position of the ring groove 122 at the top.

The specific gap width and gap length of the slit 121, the number of slits 121 and the number of the ring grooves 122 may be determined according to actual needs, in a feasible embodiment, a plurality of rings of ring grooves 122 are provided on the outer tube 1, the plurality of slits 121 include a plurality of first slits and a plurality of second slits arranged in a staggered manner, the first slits extend upward to the positions of the ring grooves 122 located at the top, and the second slits extend upward to the top end of the external thread, so that the elasticity of the elastic claw meets the requirements.

Further, for convenience of processing and installation, as shown in fig. 1, the slide bar 2 includes an upper slide bar 21 and a lower slide bar 22 fixed up and down, an upper convex ring 211 is formed at an upper end of the upper slide bar 21, and a lower convex ring 221 is formed at a lower end of the lower slide bar 22. The outer tube 1 comprises a conversion connecting tube 11 and an outer tube 12 which are fixed up and down, a second limit step 123 is formed on the inner wall of the outer tube 12, an inner tube 13 penetrates through the outer tube 12 and is positioned between the conversion connecting tube 11 and the second limit step 123, and the lower end of the inner tube 13 can abut against the second limit step 123. An elastic claw is formed on the outer cylinder 12, a first limit step 131 is formed on the inner cylinder 13, and the ball seat 5 and the upper portion of the upper slide bar 21 are located in the inner cylinder 13.

Generally, the upper sliding rod 21 is a cylindrical structure with a closed top, the lower sliding rod 22 is a cylindrical structure with a closed bottom, the outer wall of the lower end of the upper sliding rod 21 is in threaded connection with the inner wall of the upper end of the lower sliding rod 22, the top center of the upper sliding rod 21 is provided with an upper liquid passing hole 212, the bottom center of the lower sliding rod 22 is provided with a lower liquid passing hole 222, and the upper liquid passing hole 212, the inner cavity of the upper sliding rod 21, the inner cavity of the lower sliding rod 22 and the lower liquid passing hole 222 form the central channel, so that the central channel can be used for circular well washing operation. The outer cylinder 12 and the inner cylinder 13 are both of a cylindrical structure with openings at two ends, the outer wall of the lower end of the conversion connecting pipe 11 is in threaded connection with the inner wall of the upper end of the outer cylinder 12, and the inner wall of the upper end of the conversion connecting pipe 11 is provided with internal threads so as to be conveniently in threaded connection with a drilling tool; the above-mentioned resilient fingers and the annular groove 122 are formed on the outer barrel 12, and the lower end of the outer barrel 12 can be used for connection with a pipe string to be released.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the utility model should fall within the protection scope of the utility model.

Claims

1. A releasing device, comprising:

the lower end of the outer pipe is provided with a plurality of elastic claws, a slit is formed between every two adjacent elastic claws, the slit extends downwards to the lower end of the outer pipe, and the outer wall of each elastic claw is provided with an external thread; a first limiting step is arranged on the inner wall of the outer pipe;

the sliding rod can be axially and slidably arranged in the outer pipe in a penetrating mode, an upper convex ring and a lower convex ring are respectively arranged at the upper end and the lower end of the sliding rod in an outward protruding mode, and the first limiting step is located below the lower convex ring and can axially limit the upper convex ring; the lower convex ring can be abutted against each elastic claw and can prop open each elastic claw, so that the external thread on each elastic claw can be matched with a female buckle;

2. The releasing device of claim 1,

the slide bar is internally provided with a central channel which runs through two ends of the slide bar.

3. The releasing device of claim 1,

and a compression spring is further sleeved on the sliding rod, and two ends of the compression spring respectively prop against the first limiting step and the upper convex ring.

4. The releasing device of claim 1,

and a check valve is also arranged between the sliding rod and the ball seat.

5. The releasing device of claim 1,

the ball seat is an annular structure with a central hole, and a plurality of through holes are formed in the annular structure and around the central hole.

6. The releasing device of claim 1,

and at least one ring of annular groove is arranged on the outer wall of the lower part of the outer pipe and above the external thread, and at least one slit extends upwards to the position of the annular groove at the top.

7. The releasing device of claim 6,

be equipped with many rings on the outer tube the annular, many the slot is including crisscross many first slots and many second slots that set up, first slot upwards extends to and is located the top the position of annular, the second slot upwards extends to the top of external screw thread.

8. The releasing device of claim 1,

the slide bar includes fixed upper slide bar and lower slide bar from top to bottom, go up the bulge loop and form the upper end of going up the slide bar, the bulge loop forms down the lower extreme of slide bar.

9. The releasing device of claim 8,

the outer pipe comprises a conversion connecting pipe and an outer cylinder which are fixed up and down, a second limiting step is formed on the inner wall of the outer cylinder, an inner cylinder penetrates through the outer cylinder and is positioned between the conversion connecting pipe and the second limiting step, and the lower end of the inner cylinder can abut against the second limiting step; the elastic claw is formed on the outer cylinder, the first limiting step is formed on the inner cylinder, and the ball seat and the upper part of the upper sliding rod are both positioned in the inner cylinder.

10. The releasing device of claim 9,

the outer wall of the lower end of the upper sliding rod is in threaded connection with the inner wall of the upper end of the lower sliding rod, and the outer wall of the lower end of the conversion connecting pipe is in threaded connection with the inner wall of the upper end of the outer barrel.