CN221169514U - Self-locking casing cement sheath extrusion device - Google Patents

Abstract

The utility model belongs to the field of recovery of abandoned well casings, and discloses a self-locking casing cement sheath extrusion device which comprises an outer pipe, pushing teeth, thrust teeth, a push rod and a crushing structure; the inner wall of the outer tube is provided with a guide block; the outer wall of the pushing tooth and the outer wall of the thrust tooth are respectively provided with a first guide chute and a second guide chute against the guide block; the first guide chute and the second guide chute are arranged on a straight line; the first guide chute and the second guide chute are communicated to form a channel, and the guide block can be embedded into the channel and relatively move; the thrust tooth part and the latch tooth part can be meshed; the push rod is sleeved with an elastic piece, and the elastic piece is limited by the outer pipe and the push rod; after the second guide sliding groove is separated from the guide block, the thrust tooth moves upwards in a rotating mode along the edge of the thrust tooth part under the action of the elastic piece until the guide block is clamped at the tooth valley of the clamping tooth part, and self-locking is achieved.

Description

Self-locking casing cement sheath extrusion device

Technical Field

The utility model relates to the technical field of well abandoning casing recovery, in particular to a self-locking casing cement sheath extrusion device.

Background

When resources in an oil reservoir developed by one oil and gas well are exhausted, in order to fully utilize the well slot and supporting facilities of the oil and gas well, a new well is often drilled by using the side of the original well slot, or the oil and gas well is abandoned. The GB2021 oil and gas drilling ocean well abandoning operation regulations require well abandoning operation to select proper well depth, then layer-by-layer cutting, salvaging and recycling of the sleeve from inside to outside, and finally permanent plugging by cement. However, casing recovery operations are time consuming, especially for complex offshore wells, the time required for tripping and casing recovery operations is 70% of the total well abandonment operation time. For these time-consuming operations, time savings can significantly reduce the cost of the operation. At present, the recovery operation of the sleeve mainly adopts cutting, salvaging, milling or grinding technology. In a common sleeve recovery process, firstly, a cutting tool is put into a well, a section of a sleeve to be recovered is cut off by the cutting tool, and then the cut sleeve is pulled out by a lifting tool, so that the recovery process is completed. However, in the process of preface well drilling and well cementation, cement paste is injected into the outer side of the casing, and along with solidification of the cement paste, the casing, the cement paste and surrounding rock stratum (well bore) are bonded to form a whole, so that the cement sheath outside the casing needs to be extruded first.

In the common cement sheath extrusion operation process, firstly, the casing cement sheath extrusion device is put into the well, then the casing cement sheath extrusion device is moved to a designated position, and then the casing cement sheath extrusion device can perform extrusion operation. The conventional casing cement sheath extrusion device comprises an outer pipe and a crushing device, wherein the crushing device cannot be in a position in the process of well descending and lifting, otherwise, the casing cement sheath extrusion device can be blocked by a abandoned well. Therefore, the crushing device is in a hidden state in the process of going into the well and lifting. When the casing cement sheath extrusion device reaches a designated position, high-pressure fluid is required to be continuously injected into the casing cement sheath extrusion device to provide downward pressure, so that the crushing device is kept in a positioned state to extrude the cement sheath, and extrusion operation interruption caused by the fact that the casing cement sheath extrusion device is separated from the cement sheath under the action of the resistance of the cement sheath is avoided, but too much energy is consumed in the mode, and the operation cost is too high.

Disclosure of utility model

The utility model mainly aims to provide a self-locking casing cement sheath extrusion device, and aims to solve the problems of too much energy consumption and too high operation cost caused by continuously injecting high-pressure fluid into the casing cement sheath extrusion device.

The utility model discloses the following technical scheme:

The self-locking casing cement sheath extruding device comprises an outer pipe, pushing teeth, thrust teeth, a push rod and a crushing structure;

The pushing teeth, the thrust teeth and the push rod are sequentially connected from top to bottom and are arranged in the outer tube;

the pushing teeth, the thrust teeth and the pushing rod transmit kinetic energy to the crushing structure;

the crushing structure is used for extruding the casing cement sheath;

The inner wall of the outer tube is provided with a guide block;

The outer wall of the pushing tooth and the outer wall of the thrust tooth are respectively provided with a first guide chute and a second guide chute in contrast with the guide block;

The first guide chute and the second guide chute are arranged on a straight line;

the first guide sliding chute and the second guide sliding chute are communicated to form a channel, and the guide block can be embedded into the channel and relatively move;

the bottom of the pushing tooth is provided with a pushing tooth part, the pushing tooth top is provided with a latch part, and the pushing tooth part and the latch part can be meshed;

an elastic piece is sleeved on the push rod and limited by the outer tube and the push rod;

When the pushing teeth push the anti-pushing teeth to move downwards and squeeze the elastic piece, after the second guide sliding groove is separated from the guide block, the anti-pushing teeth move upwards in a rotating way along the edge of the pushing teeth under the action of the elastic piece until the guide block is clamped at the tooth valley of the tooth clamping part, so that self-locking is realized.

Further, the second guide sliding groove comprises a plurality of second guide sliding grooves;

the second guide sliding grooves are circumferentially arranged on the thrust teeth;

The latch part comprises a plurality of second helical tooth bodies;

The second helical gear bodies are distributed between every two second guide sliding grooves;

The second helical gear bodies between two adjacent second guide sliding grooves are arranged in a step shape;

when the self-locking is realized, the guide blocks are clamped at the joint positions of the two second helical gear bodies.

Further, the first guide sliding groove comprises a plurality of first guide sliding grooves;

The plurality of first guide sliding grooves are circumferentially arranged on the pushing teeth;

the thrust tooth includes a plurality of first helical teeth;

the first helical gear bodies are distributed between every two first guide sliding grooves;

The radian of the first helical gear body is matched with the radian of the second helical gear body.

Further, the pushing teeth further comprise pushing pieces;

The pushing piece is arranged at a position where the notch of the first guide chute is connected with one end of the first helical gear body, which is close to the top of the outer tube;

The pushing piece is used for abutting against the latch part so as to push the thrust teeth to move.

Further, a first thread is arranged on the push rod, and a second thread is arranged on the inner wall of the outer tube;

the first thread and the second thread are matched;

The push rod and the outer tube are in meshed connection through the first thread and the second thread.

Further, the crushing structure comprises a transmission structure and a rolling ring;

The part of the structure of the push rod extends out of the outer tube and is connected with the transmission structure;

The rolling ring is arranged on the transmission structure in a penetrating way;

When the self-locking is carried out, the push rod drives the rolling ring to move along the radial direction of the central shaft of the push rod through the transmission structure.

Further, the transmission structure comprises a driving wheel structure and a driven wheel structure;

the push rod is structurally connected with the driving wheel;

The driven wheel structure is arranged on the side surface of the driving wheel;

the driven wheel structure is meshed with the driving wheel structure and moves along the axial direction of the driving wheel structure;

the driving wheel structure and the driven wheel structure are positioned in the rolling ring;

the driven wheel structure is abutted with the rolling ring;

the driving wheel structure is a structure with a narrow upper part and a wide lower part;

When the self-locking is carried out, the push rod drives the driving wheel structure to rotate, so that the driven wheel structure moves downwards along the driving wheel structure, and the rolling ring is extruded to move along the radial direction of the central shaft of the push rod.

Further, the push rod comprises a push rod body and a spline shaft, wherein the spline shaft is arranged at the bottom of the push rod body;

and a spline groove is formed in one end, facing the push rod, of the driving wheel structure, and the spline shaft is inserted into the spline groove.

Further, the device also comprises a clamp;

the clamp is arranged at the bottom of the outer tube;

part of the structure of the clamp is embedded into the outer tube;

a clamping groove is formed in the clamp;

A clamping ring is arranged on the surface of the driving wheel structure;

The clamping hoop is sleeved on the driving wheel structure and is clamped and fixed with the clamping ring through the clamping groove;

A bottom plate is arranged at the bottom of the driving wheel structure;

the rolling ring is limited through the clamp and the bottom plate.

Further, the device also comprises a support;

the support piece is arranged at the position of the inner wall of the rolling ring corresponding to the driven wheel structure;

the support is for supporting the driven wheel structure.

The beneficial effects are that:

In the utility model, the guide block is embedded into a vertical channel formed by the first guide chute and the second guide chute, so that the guide block can limit the pushing teeth and the anti-pushing teeth. When the pushing teeth push the anti-pushing teeth to move so that the guide blocks are separated from the second guide sliding grooves, the anti-pushing teeth are not limited any more, the latch portions at the bottoms of the anti-pushing teeth move upwards along the edges of the pushing teeth which can be meshed with the latch portions under the action of the elastic force of the elastic pieces until the guide blocks are clamped at the tooth valleys of the latch portions, self-locking is achieved, and the crushing structure is in a position state under the action of the push rod. In the self-locking state, the thrust teeth, the push rod and the crushing structure are locked on the outer tube, so that high-pressure fluid is not required to be continuously injected to maintain the position state of the crushing structure, the position state of the crushing structure can be maintained only by injecting low-pressure fluid, excessive energy sources are not consumed, and the operation cost is reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of the overall structure of an embodiment of the present utility model;

FIG. 2 is an external schematic view of the overall structure of an embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of the inside of an outer tube according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the structure of the thrust teeth, push rod and drive wheel according to an embodiment of the present utility model;

FIG. 5 is a schematic cross-sectional view of a rotary structure according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a self-locking structure of a push tooth, a thrust tooth and a push rod according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of the structure of the push teeth, the thrust teeth and the push rod when self-locking according to an embodiment of the present utility model;

Wherein: 1-an outer tube; 2-pushing teeth; 3-thrust teeth; 4-pushing rod; 5-crushing structure; 6-a guide block; 7-a first guide chute; 8-a second guide chute; 9-thrust teeth; 10-latch portions; 11-an elastic member; 12-pushing piece; 13-rolling rings; 14-a driving wheel structure; 15-a driven wheel structure; 16-spline shaft; 17-clamping hoop; 18-clamping grooves; 19-a snap ring; 20-a bottom plate; 21-a support; 22-spline grooves.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless specifically defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

Referring to fig. 1 to 7, in one embodiment, a self-locking casing cement sheath extrusion device comprises an outer tube 1, push teeth 2, thrust teeth 3, push rods 4 and a crushing structure 5;

The pushing teeth 2, the thrust teeth 3 and the push rod 4 are sequentially connected from top to bottom and are arranged in the outer tube 1;

The pushing teeth 2, the thrust teeth 3 and the pushing rod 4 transmit kinetic energy to the crushing structure 5;

The crushing structure 5 is used for extruding the casing cement sheath;

the inner wall of the outer tube 1 is provided with a guide block 6;

The outer wall of the pushing tooth 2 and the outer wall of the thrust tooth 3 are respectively provided with a first guide chute 7 and a second guide chute 8 against the guide block 6;

The first guide chute 7 and the second guide chute 8 are arranged on a straight line;

The first guide sliding chute 7 and the second guide sliding chute 8 are communicated to form a channel, and the guide block 6 can be embedded into the channel and relatively move;

The bottom of the pushing tooth 2 is provided with a pushing tooth part 9, the top of the thrust tooth 3 is provided with a latch part 10, and the pushing tooth part 9 and the latch part 10 can be meshed;

An elastic piece 11 is sleeved on the push rod 4, and the elastic piece 11 is limited by the outer tube 1 and the push rod 4;

When the pushing teeth 2 push the pushing teeth 3 to move downwards and squeeze the elastic member 11, and the second guiding chute 8 is separated from the guiding block 6, the pushing teeth 3 move upwards in a rotating way along the edge of the pushing teeth 9 under the action of the elastic member 11 until the guiding block 6 is clamped at the tooth valley of the clamping teeth 10, so as to realize self-locking.

In the above embodiment, the guide block 6 is embedded in the vertical channel formed by the first guide chute 7 and the second guide chute 8, so that the guide block 6 can limit the pushing teeth 2 and the thrust teeth 3. After the pushing teeth 2 push the anti-pushing teeth 3 to move so that the guide blocks 6 are separated from the second guide sliding grooves 8, the anti-pushing teeth 3 are not limited any more, the latch portions 10 at the bottoms of the anti-pushing teeth 3 move upwards along the edges of the pushing teeth 9 which can be meshed with the latch portions 10 under the elastic force of the elastic piece 11 until the guide blocks 6 are clamped at the tooth valleys of the latch portions 10, self-locking is achieved, and the crushing structure 5 is in a position state under the action of the push rod 4. In the self-locking state, the thrust teeth 3, the push rod 4 and the crushing structure 5 are locked on the outer tube 1, so that high-pressure fluid is not required to be continuously injected to maintain the position state of the crushing structure 5, and only low-pressure fluid is required to be injected to maintain the position state of the crushing structure 5, so that excessive energy is not consumed, and the operation cost is reduced.

The specific self-locking process comprises the following steps:

The first guide chute 7 is arranged on the outer wall of the pushing tooth 2, the second guide chute 8 is arranged on the outer wall of the thrust tooth 3, the first guide chute 7 and the second guide chute 8 are communicated to form a vertical channel, the inner wall of the outer tube 1 is provided with the guide block 6, the pushing tooth 2 and the thrust tooth 3 are located inside the outer tube 1, and meanwhile the guide block 6 is embedded into the channel. The push rod 4 is arranged at the bottom end of the thrust tooth 3, the elastic piece 11 is sleeved on the push rod 4, and the outer tube 1 and the push rod 4 limit the elastic piece 11. The push rod 4 is connected with the crushing structure 5

High-pressure fluid is injected into the outer tube 1, and the force of the high-pressure fluid acts on the push teeth 2, and the push teeth 2 move downward along the guide block 6 and push the thrust teeth 3 to move downward along the guide block 6. The thrust teeth 3 push the push rod 4 downward, and the outer tube 1 does not move, so that the space between the push rod 4 and the outer tube 1 is reduced, and then the elastic member 11 is compressed and deformed to generate elastic force, and the elastic force acts on the thrust teeth 3. The push rod 4 pushes the crush structure 5 from the hidden state to the in-place state. When the thrust teeth 3 move to a position where the second guide sliding groove 8 is separated from the guide block 6, the guide block 6 is completely embedded into the first guide sliding groove 7, the guide block 6 on the outer tube 1 does not limit the thrust teeth 3 any more, and then the thrust teeth 3 have a tendency to move upwards under the action of elastic force.

The bottom of the thrust tooth 2 is provided with a thrust tooth portion 9, the top of the thrust tooth 3 is provided with a tooth portion 10, the thrust tooth portion 9 and the tooth portion 10 can be meshed, namely, the thrust tooth portion 9 and the tooth portion 10 comprise a plurality of tooth bodies, the tooth bodies of the thrust tooth portion 9 and the tooth bodies of the tooth portion 10 are mutually matched, and then when the thrust tooth 3 moves upwards under the action of elastic force, the thrust tooth portion 9 can limit the thrust tooth 3 provided with the tooth portion 10, and therefore the thrust tooth 3 can move upwards in a rotating mode along the edge of the thrust tooth portion 9. The outer tube 1 and the guide block 6 arranged on the outer tube 1 do not move, the guide block 6 and the thrust teeth 3 move relatively, when the thrust teeth 3 move to the position that the guide block 6 is clamped on the tooth valley of the clamping tooth part 10, the thrust teeth 3 stop moving and cannot return to the original position due to the blocking of the guide block 6, and the thrust teeth 3, the push rod 4 and the crushing structure 5 enter a self-locking state. The crush structure 5 is now in place. Switching the high pressure fluid to a low pressure fluid maintains the crush structure 5 in place.

Ending the self-locking process:

After the crushing structure 5 finishes the operation of extruding the sleeve cement ring, high-pressure fluid is injected again, the high-pressure fluid pushes the thrust teeth 3 to move downwards through the thrust teeth 2, the elastic piece 11 is compressed to deform to generate elastic force, the elastic force acts on the thrust teeth 3 until the thrust teeth 3 move to the tooth valley of the guide block 6, which is separated from the clamping tooth part 10, and the injection of the high-pressure fluid is stopped. Under the elastic force of the elastic force and the limiting action of the thrust tooth part 9, the thrust tooth 3 performs upward rotary motion along the edge of the thrust tooth part 9 again until the second guide chute 8 rotates to the guide block 6, the guide block 6 is embedded into the second guide chute 8 under the limiting action of the thrust tooth 3, the thrust tooth 3 moves upward along the guide block 6, finally returns to the original position, and self-locking is finished.

In the whole process, the self-locking and unlocking actions are completed by only injecting high-pressure fluid twice, and after the extrusion operation is performed, the crushing structure 5 is kept in the in-place state by only injecting low-pressure fluid.

In a specific embodiment, the elastic element 11 is limited by the outer tube 1 and the push rod 4, and the specific structure may be that one end of the elastic element 11 is connected with the outer tube 1, and the other end is connected with the push rod 4; the outer tube 1 may be provided with a stepped hole, and the top of the push rod 4 may be provided with a thrust cap, so that the elastic member 11 is limited by the stepped hole and the thrust cap.

The pushing teeth 2 can be in threaded connection with the outer tube 1.

In one embodiment, a plurality of said second guide runners 8 are included;

a plurality of second guide sliding grooves 8 are circumferentially arranged on the thrust teeth 3;

the latch 10 includes a plurality of second helical teeth;

the second helical gear bodies are distributed between every two second guide sliding grooves 8;

The second helical gear bodies between two adjacent second guide sliding grooves 8 are arranged in a step shape;

When the self-locking is realized, the guide block 6 is clamped at the joint position of the two second helical gear bodies.

In the above embodiment, the thrust teeth 3 are provided with a plurality of second guide sliding grooves 8, and correspondingly, a plurality of guide blocks 6 can also be provided on the outer tube 1, so that the self-locking capability can be increased, and meanwhile, the movement of the thrust teeth 3 is more stable. The second helical gear bodies between two adjacent second guiding sliding grooves 8 are arranged in a step shape, the second helical gear bodies are helical teeth, and then the joint position of the two second helical gear bodies is the tooth valley of the tooth clamping part 10.

When the self-locking is carried out, the anti-thrust tooth 3 moves upwards in a rotating way, relative movement is generated between the anti-thrust tooth 3 and the guide block 6, and a first inclined tooth body gradually passes through the guide block 6 from one end to the other end until the guide block 6 is clamped at the joint position of the two second inclined tooth bodies, so that the self-locking is realized.

In particular, the second helical tooth body may be an arcuate tooth.

In one embodiment, a plurality of said first guide runners 7 are included;

a plurality of first guide sliding grooves 7 are circumferentially arranged on the pushing teeth 2;

the thrust tooth 9 comprises a plurality of first helical tooth bodies;

The first helical gear bodies are distributed between every two first guide sliding grooves 7;

The radian of the first helical gear body is matched with the radian of the second helical gear body.

In the above embodiment, the thrust teeth 3 are provided with a plurality of second guide sliding grooves 8, the thrust teeth 2 are provided with a plurality of first guide sliding grooves 7, and the first guide sliding grooves 7 and the second guide sliding grooves 8 are communicated to form a plurality of channels, so that a plurality of guide blocks 6 can be correspondingly arranged.

The radian of the first helical gear is matched with that of the second helical gear, so that the thrust teeth 3 can slide along the first helical gear.

In particular, the first helical tooth body may be an arcuate tooth.

In an embodiment, the pushing tooth 2 further comprises a pushing member 12;

The pushing piece 12 is arranged at the position where the notch of the first guide chute 7 is connected with one end of the first helical gear body close to the top of the outer tube 1;

the pushing piece 12 is used for abutting against the latch portion 10 to push the thrust tooth 3 to move.

In the above embodiment, the pushing teeth 2 need to push the thrust teeth 3 to move downwards, when self-locking is achieved, the pushing teeth 2 and the guide blocks 6 are clamped at the tooth valleys of the clamping tooth parts 10 together, and the pushing teeth 2 are not easy to separate from the tooth valleys under the action of the guide blocks 6 and the thrust teeth 3. When the pushing member 12 is pushed by the pushing member 12, the pushing member 12 can be disengaged more easily than the whole pushing tooth 2 structure if the pushing member 12 is caught at the tooth valley of the latch portion 10.

In a preferred embodiment, the pusher member 12 may be configured as a wedge.

In one embodiment, the push rod 4 is provided with a first thread, and the inner wall of the outer tube 1 is provided with a second thread;

the first thread and the second thread are matched;

the push rod 4 and the outer tube 1 are engaged and connected through the first thread and the second thread.

In one embodiment, during the self-locking and unlocking process, the thrust tooth 3 drives the push rod 4 to rotate. The first screw thread that sets up on the push rod 4, the second screw thread that sets up on the inner wall of outer tube 1 can let the rotation of push rod 4 more steady. Simultaneously, the first thread and the second thread are meshed, so that the push rod 4 can be limited, and the push rod 4 is prevented from falling off from the outer tube 1.

In an embodiment, the crushing structure 5 comprises a transmission structure and a rolling ring 13;

Part of the structure of the push rod 4 extends out of the outer tube 1 and is connected with the transmission structure;

the rolling ring 13 is arranged on the transmission structure in a penetrating way;

when the self-locking is performed, the push rod 4 drives the rolling ring 13 to move along the radial direction of the central shaft of the push rod 4 through the transmission structure.

In one embodiment, the rolling ring 13 is inserted through the transmission structure, but is not fixed, and when the crushing structure 5 is in a hidden state, the central axis of the rolling ring 13 and the central axis of the push rod 4 are in a straight line. In the process of self-locking, the rolling ring 13 is changed from a hidden state to a position state, and the push rod 4 drives the rolling ring 13 to move along the radial direction of the central shaft of the push rod 4 through a transmission structure. When the crushing structure 5 is in place, the rolling ring 13 is in an eccentric state with respect to the central axis of the push rod 4, i.e. the central axis of the rolling ring 13 and the central axis of the push rod 4 are not in line, and part of the side structure is closer to the cement ring with respect to the outer tube 1.

When the self-locking sleeve cement sheath extrusion device enters a self-locking state, the crushing structure 5 starts to extrude the sleeve cement sheath.

The specific process of the operation of the crushing structure 5:

The oil bull stick drives outer tube 1 and rotates, and push away tooth 2, thrust tooth 3, push rod 4 in the outer tube 1 also can rotate, and push rod 4 passes through transmission structure transmission kinetic energy to extrusion roll ring 13, and then extrusion sleeve pipe cement ring.

In a preferred embodiment, the rolling ring 13 may be provided with a crush ring in the circumferential direction, the crush ring protruding from the side wall of the rolling ring 13. The contact area of the crushing ring and the casing cement ring is small, the pressure intensity is increased, and the casing cement ring can be broken more effectively.

In one embodiment, the transmission structure includes a driving wheel structure 14 and a driven wheel structure 15;

The push rod 4 is connected with the driving wheel structure 14;

the driven wheel structure 15 is arranged on the side surface of the driving wheel;

The driven wheel structure 15 is meshed with the driving wheel structure 14 and moves along the axial direction of the driving wheel structure 14;

The driving wheel structure 14 and the driven wheel structure 15 are positioned in the rolling ring 13;

the driven wheel structure 15 is abutted with the rolling ring 13;

the driving wheel structure 14 is a structure with a narrow upper part and a wide lower part;

When the self-locking is performed, the push rod 4 drives the driving wheel structure 14 to rotate, so that the driven wheel structure 15 moves downwards along the driving wheel structure 14, and the rolling ring 13 is extruded to move along the radial direction of the central shaft of the push rod 4.

In the above embodiment, the driving pulley structure 14 and the driven pulley structure 15 are engaged, converting the rotational motion of the driving pulley structure 14 into the linear motion. The driven wheel structure 15 moves along the driving wheel structure 14, and since the driving wheel structure 14 is a structure with a narrow upper part and a wide lower part, when the driven wheel structure 15 moves downwards, the driven wheel structure 15 is further and further away from the central axis of the push rod 4, and the driven wheel structure 15 abuts against the rolling ring 13, so that the driven wheel structure 15 can squeeze the rolling ring 13 to move along a direction away from the central axis of the push rod 4.

In the process of achieving self-locking, the driven wheel structure 15 moves downwards along the driving wheel structure 14, and simultaneously the pressing rolling ring 13 is changed from the hidden state to the in-place state.

After the self-locking is completed, the driven wheel structure 15 has moved to the bottom of the driving wheel structure 14 to the limit position, at which time the driven wheel structure 15 and the driving wheel structure 14 are relatively stationary.

The specific process of the operation of the crushing structure 5:

The oil bull stick drives outer tube 1 and rotates, and push away tooth 2, thrust tooth 3, push rod 4 in the outer tube 1 also can rotate, and push rod 4 drives action wheel structure 14 and rotates, and action wheel structure 14 also can drive from driving wheel structure 15 rotation, and in this way, from driving wheel structure 15 continuously acts on rolling ring 13, extrudes rolling ring 13, and then extrudes sleeve pipe cement ring through rolling ring 13.

After the extrusion operation is completed, the injection hydraulic pressure is reduced, the push rod 4 moves upwards under the action of the pressure difference of the elastic force of the elastic piece 11 and the thrust force of the push teeth 2, the rotation direction is changed, the rotation direction of the driving wheel structure 14 is changed, the driven wheel structure 15 moves upwards along the driving wheel structure 14, and the rolling ring 13 gradually returns to the concentric hidden state from the eccentric in-place state.

In one embodiment, the push rod 4 comprises a push rod 4 body and a spline shaft 16, wherein the spline shaft 16 is arranged at the bottom of the push rod 4 body;

The end of the drive wheel structure 14 facing the push rod 4 is provided with a spline groove 22, and the spline shaft 16 is inserted into the spline groove 22.

In the above embodiment, the spline shaft 16 and spline grooves 22 are provided so that the coupling of the drive wheel structure 14 and the push rod 4 is tighter.

In one embodiment, the device further comprises a clamp 17;

the clamp 17 is arranged at the bottom of the outer tube 1;

part of the structure of the clip 17 is embedded in the outer tube 1;

A clamping groove 18 is formed in the clamp 17;

the surface of the driving wheel structure 14 is provided with a clamping ring 19

The clamping hoop 17 is sleeved on the driving wheel structure 14 and is clamped and fixed through the clamping groove 18 and the clamping ring 19;

a bottom plate 20 is arranged at the bottom of the driving wheel structure 14;

The rolling ring 13 is limited by the clip 17 and the bottom plate 20.

In the above embodiment, the clip 17 can protect the driver structure 14 from damage by foreign objects. The provision of the clamping groove 18 and the snap ring 19 helps the clamp 17 and the driver structure 14 to be more tightly connected. The rolling ring 13 limits the rolling ring 13 through the clamp 17 and the bottom plate 20, so that the movement of the rolling ring 13 is not limited and cannot fall off.

In an embodiment, further comprising a support 21;

The supporting piece 21 is arranged on the inner wall of the rolling ring 13 at a position corresponding to the driven wheel structure 15;

the support 21 is used to support the driven wheel structure 15.

In the above embodiment, since the driving shaft structure is a structure with a narrow upper part and a wide lower part, and the driven wheel group structure is also adapted to the driving shaft structure, the driven wheel structure 15 is a structure with a wide upper part and a narrow lower part, and the driven wheel structure 15 is disposed in the rolling ring 13 and has a falling risk, and the supporting member 21 helps the driven wheel structure 15 avoid falling.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes using the descriptions and drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the utility model.

Claims (10)

1. The self-locking sleeve cement sheath extrusion device is characterized by comprising an outer tube, pushing teeth, thrust teeth, a push rod and a crushing structure;

The pushing teeth, the thrust teeth and the push rod are sequentially connected from top to bottom and are arranged in the outer tube;

the pushing teeth, the thrust teeth and the pushing rod transmit kinetic energy to the crushing structure;

the crushing structure is used for extruding the casing cement sheath;

The inner wall of the outer tube is provided with a guide block;

The outer wall of the pushing tooth and the outer wall of the thrust tooth are respectively provided with a first guide chute and a second guide chute in contrast with the guide block;

The first guide chute and the second guide chute are arranged on a straight line;

the first guide sliding chute and the second guide sliding chute are communicated to form a channel, and the guide block can be embedded into the channel and relatively move;

the bottom of the pushing tooth is provided with a pushing tooth part, the pushing tooth top is provided with a latch part, and the pushing tooth part and the latch part can be meshed;

an elastic piece is sleeved on the push rod and limited by the outer tube and the push rod;

When the pushing teeth push the anti-pushing teeth to move downwards and squeeze the elastic piece, after the second guide sliding groove is separated from the guide block, the anti-pushing teeth move upwards in a rotating way along the edge of the pushing teeth under the action of the elastic piece until the guide block is clamped at the tooth valley of the tooth clamping part, so that self-locking is realized.

2. The self-locking casing cement sheath extrusion apparatus of claim 1, comprising a plurality of said second guide runners;

the second guide sliding grooves are circumferentially arranged on the thrust teeth;

The latch part comprises a plurality of second helical tooth bodies;

The second helical gear bodies are distributed between every two second guide sliding grooves;

The second helical gear bodies between two adjacent second guide sliding grooves are arranged in a step shape;

when the self-locking is realized, the guide blocks are clamped at the joint positions of the two second helical gear bodies.

3. The self-locking casing cement sheath extrusion apparatus of claim 2, comprising a plurality of said first guide runners;

The plurality of first guide sliding grooves are circumferentially arranged on the pushing teeth;

the thrust tooth includes a plurality of first helical teeth;

the first helical gear bodies are distributed between every two first guide sliding grooves;

The radian of the first helical gear body is matched with the radian of the second helical gear body.

4. The self-locking casing cement sheath extrusion apparatus of claim 3, wherein said pusher teeth further comprise a pusher;

The pushing piece is arranged at a position where the notch of the first guide chute is connected with one end of the first helical gear body, which is close to the top of the outer tube;

The pushing piece is used for abutting against the latch part so as to push the thrust teeth to move.

5. The self-locking casing cement sheath extrusion apparatus as recited in claim 1, wherein the push rod is provided with a first thread, and the inner wall of the outer tube is provided with a second thread;

the first thread and the second thread are matched;

The push rod and the outer tube are in meshed connection through the first thread and the second thread.

6. The self-locking casing cement sheath extrusion apparatus of claim 1, wherein the crush structure comprises a drive structure and a rolling ring;

The part of the structure of the push rod extends out of the outer tube and is connected with the transmission structure;

The rolling ring is arranged on the transmission structure in a penetrating way;

When the self-locking is carried out, the push rod drives the rolling ring to move along the radial direction of the central shaft of the push rod through the transmission structure.

7. The self-locking casing cement sheath extrusion apparatus as recited in claim 6, wherein the transmission structure comprises a drive wheel structure and a driven wheel structure;

the push rod is structurally connected with the driving wheel;

The driven wheel structure is arranged on the side surface of the driving wheel;

the driven wheel structure is meshed with the driving wheel structure and moves along the axial direction of the driving wheel structure;

the driving wheel structure and the driven wheel structure are positioned in the rolling ring;

the driven wheel structure is abutted with the rolling ring;

the driving wheel structure is a structure with a narrow upper part and a wide lower part;

When the self-locking is carried out, the push rod drives the driving wheel structure to rotate, so that the driven wheel structure moves downwards along the driving wheel structure, and the rolling ring is extruded to move along the radial direction of the central shaft of the push rod.

8. The self-locking casing cement sheath extrusion apparatus of claim 7, wherein the pushrod comprises a pushrod body and a spline shaft, the spline shaft being disposed at a bottom of the pushrod body;

and a spline groove is formed in one end, facing the push rod, of the driving wheel structure, and the spline shaft is inserted into the spline groove.

9. The self-locking casing cement sheath extrusion apparatus as recited in claim 7, further comprising a collar;

the clamp is arranged at the bottom of the outer tube;

part of the structure of the clamp is embedded into the outer tube;

a clamping groove is formed in the clamp;

A clamping ring is arranged on the surface of the driving wheel structure;

The clamping hoop is sleeved on the driving wheel structure and is clamped and fixed with the clamping ring through the clamping groove;

A bottom plate is arranged at the bottom of the driving wheel structure;

the rolling ring is limited through the clamp and the bottom plate.

10. The self-locking casing cement sheath extrusion apparatus of claim 7, further comprising a support;

the support piece is arranged at the position of the inner wall of the rolling ring corresponding to the driven wheel structure;

the support is for supporting the driven wheel structure.