CN210178313U

CN210178313U - Sleeve back-off device

Info

Publication number: CN210178313U
Application number: CN201921047221.9U
Authority: CN
Inventors: Fubin Tang; 唐福彬; Yanmei Cai; 才艳梅; Yongcun Cai; 才永存; Gang Li; 李刚
Original assignee: Tonghua Hongguang Petroleum Machinery Co ltd
Current assignee: Tonghua Hongguang Petroleum Machinery Co ltd
Priority date: 2019-07-06
Filing date: 2019-07-06
Publication date: 2020-03-24
Anticipated expiration: 2029-07-06

Abstract

The utility model relates to an oil field workover tool, sleeve pipe back-off ware promptly. The slip type tooth-embedded drilling machine comprises an upper body and a lower body which are connected in a threaded manner, wherein the upper body is sequentially connected with an upper connector, a mandrel and a lower connector, a jaw connecting sleeve and a main cylinder body are sequentially sleeved outside the mandrel, slips capable of extending out are connected onto the main cylinder body, the slips are arranged at intervals along the circumference, and a planetary gear device in transmission connection is arranged between the main cylinder body and the mandrel; the lower part of the body is connected with center pin, bottom connection in order, has the second slips that can stretch out on the center pin along radial, and the second slips is along circumference interval arrangement, has the piece of righting that can stretch out along radial on the center pin, and the piece of righting is along circumference interval arrangement and supported by the pressure spring, and the piece of righting stretches out the cover of righting, and the cover of righting is connected by the spring-supported along the axial between bottom connection. The lower joint is connected with the central shaft through threads. The special tool is provided, and the casing at any position in the well can be broken out and taken out. The tool is reasonable in structure, applicable, convenient to operate, safe and reliable, and worthy of popularization.

Description

Sleeve back-off device

Technical Field

The utility model relates to an oil field workover tool, sleeve pipe back-off ware promptly.

Background

In the prior art, the petroleum casing is mainly used for supporting the well wall during the drilling process and after the completion of the well, so as to ensure the normal operation of the whole oil well after the drilling process and the completion of the well. Once the casing itself is damaged for some reason, it may cause a reduction in the production of the entire well, or even a rejection. The petroleum well casing pipe is corroded in the underground and is damaged by individual casing pipes during well repairing operation all year round, and replacement and maintenance are extremely difficult. In the past, the casing has problems, and is usually forcibly scrapped in a downhole mode, and no feasible disassembling tool exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the aforesaid is not enough and provide a sleeve pipe back-off ware, has realized that the individual sleeve pipe damages in the pit and has carried out the back-off of individuation fixed point, and the cost has been practiced thrift in individuation, has reduced maintenance duration to easy maintenance.

The technical solution of the utility model is that: the casing pipe back-off device is characterized by comprising an upper body and a lower body which are connected in a threaded manner, wherein the upper body is sequentially connected with an upper joint, a mandrel and a lower joint; the lower part of the body is connected with center pin, bottom connection in order, has the second slips that can stretch out on the center pin along radial, and the second slips is along circumference interval arrangement, has the piece of righting that can stretch out along radial on the center pin, and the piece of righting is along circumference interval arrangement and supported by the pressure spring, and the piece of righting stretches out the cover of righting, and the cover of righting is connected by the spring-supported along the axial between bottom connection. The lower joint is connected with the central shaft through threads.

In the above-mentioned scheme, the first step of the method,

the main cylinder body is connected with a slip outer sleeve and a slip capable of extending out of the slip outer sleeve, and the position of the main cylinder body, corresponding to the slip, is of a three-convex cam structure along the circumference.

The planetary gear device comprises a mandrel section external gear and a main cylinder section internal gear, and five planetary gears are meshed between the mandrel section external gear and the main cylinder section internal gear.

Preferably, the casing pipe back-off device is characterized by comprising an upper body and a lower body which are in threaded connection, wherein the upper body is sequentially connected with an upper joint, a mandrel and a lower joint, a jaw connecting sleeve, a main cylinder body, a first gear carrier and a second gear carrier are sequentially sleeved outside the mandrel, a slip outer sleeve and a slip capable of extending out of the slip outer sleeve are connected onto the main cylinder body, a cam structure which is three-convex along the circumference is arranged at the position of the main cylinder body, which corresponds to the slip, and a planetary gear device in transmission connection is arranged between the main cylinder body and the mandrel; the lower part of the body is connected with center pin, bottom connector in order, has on the center pin to connect in order and has cup jointed the cam sleeve, right cover, spring, cam sleeve department has arranged the second slips along circumference interval, the cam sleeve corresponds second slips department and is the second cam structure of three convexities along the circumference, right cover department has the piece of righting that can stretch out right cover, right the piece along circumference interval arrangement and by the pressure spring support, right between cover and the bottom connector by the spring support connection along the axial. The lower joint is connected with the central shaft through threads.

The utility model has the advantages that: 1. the special tool can break out and take out the casing pipes at any position and fixed point (selected position) in the well, the slip grabs the casing pipes firmly, the upper body and the lower body work simultaneously, and the dismounting of the casing pipes with various lengths can be met. 2. The tool is reasonable in structure, applicable, convenient to operate, safe and reliable, and worthy of popularization. 3. Only need a this instrument, just can make the sleeve pipe break out in the connector link department in a direction of rotation, even to the sleeve pipe coupling location measurement in the pit inaccurate, can connect one section drilling rod between this instrument upper part of the body and the lower part of the body, can accomplish the back-off task equally, saved the use of other instruments.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a simplified upper body structure of the present invention.

Fig. 2 is a schematic view of the lower body structure of the present invention.

Fig. 3 is a schematic view of fig. 1 taken along a-a.

Fig. 4 is a schematic view of fig. 1 taken along the line B-B.

Fig. 5 is a schematic view of the structure of fig. 1 taken along the line C-C.

Fig. 6 is a schematic view of the structure of fig. 1 taken along the line D-D.

Fig. 7 is a schematic view of fig. 2 taken along the line E-E.

Detailed Description

Referring to fig. 1-7, the part names are as follows: the pipe joint comprises an upper joint 1, a jaw connecting sleeve 2, a sleeve 3 below a discharged sleeve, a planetary gear carrier 4, a slip outer sleeve 5, slips 6 (3), a mandrel 7, a main cylinder 8, a first gear carrier 9, a second cam structure 10, a second gear carrier 11, a discharged sleeve 12, a lower joint 15, a central shaft 16, a cam sleeve 17, a centering sleeve 18, a pressure spring 19, a centering block 20 (3), a pressing sleeve 21, a spring 22, a spring seat 23, a bottom joint 24, a second slip 30 (3), a cam structure 31, a mandrel section outer gear 32, a main cylinder section inner gear 33 and a planetary gear 34.

Referring to fig. 1 and 2, the casing back-off device comprises an upper body and a lower body which are connected by screw threads. The lower connector 15 of the upper body is screwed to the central shaft 16 of the lower body.

Referring to fig. 1, 3, 4, and 5, the upper body is sequentially threadedly coupled with an upper joint 1, a mandrel 7, and a lower joint 15, which are hollow in the middle. The mandrel 7 is sequentially sleeved with a jaw connecting sleeve 2 (see figure 3), a main cylinder 8, a first gear frame 9 and a second gear frame 11. The main cylinder 8 is connected with a slip jacket 5 and a slip 6 (anchor tooth) capable of extending out of the slip jacket 5. The main cylinder 8 is provided with a cam structure 31 (see fig. 4) which is three convex along the circumference corresponding to the slips 6. A planetary gear device is arranged between the main cylinder 8 and the spindle 7 in transmission connection (see figure 5). The planetary gear device comprises a mandrel segment external gear 32 and a main cylinder segment internal gear 33, and five planetary gears 34 are meshed between the mandrel segment external gear 32 and the main cylinder segment internal gear 33. The planetary gears 34 are supported by the planetary carrier 4. The inner gear 33 of the main cylinder section drives the main cylinder 8 to rotate in the left-hand direction, and the planet gear carrier 4 drives the lower joint 15 to rotate in the right-hand direction.

Referring to fig. 1, 6 and 7, the lower body is in turn threadedly connected to a central shaft 16 and a bottom connector 24. The central shaft 16 is sequentially connected and sleeved with a cam sleeve 17, a centering sleeve 18 and a spring 22. The cam sleeve 17 is provided with second slips 30 (see figure 6) at intervals along the circumference, and the cam sleeve 17 is provided with a second cam structure 10 which is three convex along the circumference and corresponds to the second slips 30. The centralizing sleeve 18 is provided with centralizing blocks 20 capable of extending out of the centralizing sleeve 18, the centralizing blocks 20 are arranged at intervals along the circumference and supported by a compression spring 19 (see fig. 7. the centralizing blocks 20 can move along the radial direction and are supported by the casing 3 below the discharged casing), and the centralizing sleeve 18 is in supporting connection with a bottom connector 24 along the axial direction by a spring 22.

The technical parameters are as follows: the total length is 2600 mm, the outer diameter is 114 mm, the maximum output torque is 8000N/M, the maximum allowable tension is 200KN, and the applicable sleeve is 121 mm and 124 mm. A buckle type NC31 is connected.

Referring to fig. 1-7, after the upper body and the lower body are connected, the upper body and the lower body are lowered to a preset position, the ground rotates the pipe column clockwise to drive the upper joint 1 to rotate, the elastic righting block 20 on the lower body rubs the casing 3 below the removed casing to generate resistance, the second slip 30 drives the casing 3 below the anchored removed casing (see fig. 6) by the second cam structure 10, the pipe column continues to rotate, the upper joint 1 drives the planetary gear mandrel in the cam structure 31, the planetary gear 34 rotates to drive the cam to rotate, the slip 6 is driven to anchor the removed casing 12 (see fig. 4), and at the moment, the upper slip 6 and the second slip 30 both anchor the removed casing 12 and the casing 3 below the removed casing. And continuing rotating the pipe column, driving the discharged casing pipe 12 to perform back-off anticlockwise by the slips 6, anchoring the second slips 30, and enabling the rest of the pipe strings to perform back-off and to go up until the pipe hoop is separated from the discharged casing pipe 12 (the pipe hoop is a connecting piece between the discharged casing pipe 12 and the casing pipe 3 below the discharged casing pipe), and performing back-off successfully. The pipe string is lifted up, and the slips 6 drive the discharged casing 12 out of the well. If the back-off is unsuccessful, the pipe column can be rotated counterclockwise, the slips 6 are withdrawn, the pipe column is lifted upwards, and the pipe string is lifted out of the well.

Referring to fig. 1-7, the working principle is as follows: before use, the upper body and the lower body are connected together for use. The tool is then lowered to the point where the tripped casing 12 was previously tripped (the casing collar to be tripped must be positioned between the slips on the upper and lower body tools to trip over). The pipe column rotates clockwise on the ground to drive the upper joint 1 to rotate (see figure 1), the elastic righting block 20 on the lower body rubs the casing 3 below the discharged casing to generate resistance, the mandrel 7 transmits torque under the action of the jaw connecting sleeve 2, the mandrel 7 rotates clockwise, the planet gear 34 of the planet gear device on the mandrel 7 drives the planet gear carrier 4 to rotate clockwise (see figure 5), the planet gear carrier 4 drives the lower joint 15 and the central shaft 16 (upper joint of the lower body) on the lower body to rotate clockwise simultaneously, the righting block 20 on the righting sleeve 18 is supported on the wall of the casing at the lower end to rotate when going down the well under the action of the pressure spring 19 (see figure 7), the splines in the second cam structure 10 on the central shaft 16 of the lower body rotate simultaneously and push the second slip 30 to be anchored on the wall of the casing 3 below the discharged casing (see figure 6, the second slip 30 is driven by the cam structure to be anchored on the casing, anchoring the lower body assembly against rotation. The upper body upper joint 1 continues to rotate, the planet gear carrier 4 is anchored and does not rotate, the planet gear 34 rotates in place, the main cylinder 8 is driven to rotate in the opposite direction, the cam structure 31 on the main cylinder 8 extends the upper slip 6 when rotating, the upper slip is anchored on the reversed casing 12, the upper body upper joint 1 continues to rotate until the casing 12 is dismantled, and then the upper body upper joint 1 is completely lifted out.

Claims

1. The casing pipe back-off device is characterized by comprising an upper body and a lower body which are connected in a threaded manner, wherein the upper body is sequentially connected with an upper connector (1), a mandrel (7) and a lower connector (15), a jaw connecting sleeve (2) and a main cylinder body (8) are sequentially sleeved outside the mandrel (7), slips (6) capable of extending out are connected onto the main cylinder body (8), the slips (6) are arranged at intervals along the circumference, and a planetary gear device in transmission connection is arranged between the main cylinder body (8) and the mandrel (7); the lower part of the body is connected with center pin (16), bottom sub (24) in order, radially have second slips (30) that can stretch out on center pin (16), second slips (30) are along circumference interval arrangement, center pin (16) are gone up to have and to be had and to right piece (20) that can stretch out along radial, right piece (20) are along circumference interval arrangement and by pressure spring (19) support, right piece (20) stretch out and right cover (18), right between cover (18) and bottom sub (24) along the axial by spring (22) support connection, lower clutch (15) and center pin (16) pass through threaded connection.

2. The casing pipe back-off device according to claim 1, characterized in that the main cylinder (8) is connected with a slip outer sleeve (5) and a slip (6) capable of extending out of the slip outer sleeve (5), and the main cylinder (8) is provided with a cam structure (31) which is tri-convex along the circumference and corresponds to the slip (6).

3. A casing bar according to claim 1, characterized in that the planetary gear unit comprises an external spindle segment gear (32), an internal main barrel segment gear (33), and five planetary gears (34) are engaged between the external spindle segment gear (32) and the internal main barrel segment gear (33).

4. The casing pipe back-off device is characterized by comprising an upper body and a lower body which are connected in a threaded manner, wherein the upper body is sequentially connected with an upper joint (1), a mandrel (7) and a lower joint (15), a jaw connecting sleeve (2), a main cylinder body (8), a first gear carrier (9) and a second gear carrier (11) are sequentially sleeved outside the mandrel (7), a slip outer sleeve (5) and a slip (6) which can extend out of the slip outer sleeve (5) are connected onto the main cylinder body (8), a cam structure (31) which is three-convex along the circumference is arranged at the position of the main cylinder body (8) corresponding to the slip (6), and a planetary gear device in transmission connection is arranged between the main cylinder body (8) and the mandrel (7); the lower part of the body is connected with center pin (16) in order, bottom sub (24), it has cam cover (17) to connect to cup joint in order on center pin (16), set up right (18), spring (22), cam cover (17) department has second slips (30) along circumference interval arrangement, cam cover (17) correspond second slips (30) department and are three convex second cam structure (10) for being along the circumference, set up right (18) department have can stretch out set up right (18) piece of righting (20), set up right (20) along circumference interval arrangement and are supported by pressure spring (19), set up right between (18) and the bottom sub (24) and be connected by spring (22) support along the axial, lower sub (15) pass through threaded connection with center pin (16).