CN219808977U

CN219808977U - Grinding type underground cutter

Info

Publication number: CN219808977U
Application number: CN202320972581.XU
Authority: CN
Inventors: 卜现朝
Original assignee: Tianjin Yuqian Energy Technology Co ltd
Current assignee: Tianjin Yuqian Energy Technology Co ltd
Priority date: 2023-04-26
Filing date: 2023-04-26
Publication date: 2023-10-10
Anticipated expiration: 2033-04-26

Abstract

The utility model discloses a grinding type underground cutter, which belongs to the technical field of underground cutters, wherein a fixing piece is arranged in a lifting piece in a sliding manner and used for extruding and limiting a well wall, the well wall is extruded through the expansion of the fixing piece to fix a cutting mechanism so as to prevent the fixing piece from sliding downwards caused by vibration of the cutting mechanism, the cutting mechanism comprises an auxiliary piece and a cutting piece, the auxiliary piece is fixedly arranged below the lifting piece, the cutting piece is arranged below the auxiliary piece, the cutting piece is matched with the auxiliary piece to cut the pipe wall, the cutting piece is used for moving close to the well wall and then driving the cutting piece to rotate through the auxiliary piece to cut the pipe wall, the auxiliary piece drives the cutting piece to perform forward rotation to cut and then return to reverse rotation to cut so as to prevent winding of wires, the well walls with different diameters are fixed conveniently, and the distance for adjusting the cutting according to the diameters of the wells is convenient to exert the maximum effect of the cutting piece.

Description

Grinding type underground cutter

Technical Field

The utility model relates to the field of downhole cutters, in particular to a grinding type downhole cutter.

Background

The well repairing operation refers to an operation of oil well production maintenance after oil well drilling completion and subsequent oil well production maintenance, and maintenance measures are adopted for ensuring smooth oil well production. In the maintenance process of various production wells (including oil wells, gas wells, water wells, coal-bed gas wells and shale gas wells) of oil fields, various accidents can occur, so that the phenomenon that production pipe columns or tool pipe columns in the wells are blocked can be caused. In general, the mode of lifting up and down and moving off the clamp is adopted, so that the clamp is released to lift out of the tubular column in the well; or the upper pipe column is poured out from the position above the clamping point in a reverse buckling mode of the lifting pipe column, and the lower pipe column is processed in the next step, but in some cases, the clamping is not effective due to tool failure or falling object clamping, and meanwhile, the pipe column is corroded and scaled (the gas well with long production period is mostly in existence) and cannot be opened. In this case, the workover operation encounters a difficult problem: the device is not lifted and can not be opened, so that the next operation measures such as milling can not be implemented, and the operation progress is seriously influenced.

In the prior art, a downhole string cutter with application number CN202121389741.5 comprises: the device comprises a hanging ring (0), a guide shoe (1), a cotter pin (2), a lock nut (3), a cutting disc (4), a motor (5) and an electromagnetic anchor (6); the method is characterized in that: the underground tubular column cutter is a cylinder, a cutting disc (4) connected with a key is arranged on an output shaft at the lower part of a motor (5), the cutting disc (4) is locked through a lock nut (3), the screw thread of the lock nut (3) is opposite to the steering direction of the cutting disc (4), a cotter pin (2) is arranged on a motor shaft at the lower part of the lock nut, a cone guide shoe (1) is arranged at the lower part of the motor (5), and the upper part of the motor (5) is connected with an electromagnetic anchor (6). The utility model has safe and convenient operation, can cut the pipe column in the well at any depth of the oil well, cut off the pipe column above the clamping part in a short time, improve the well repairing speed, save the well repairing cost, lighten the labor intensity of workers and increase the crude oil yield.

However, in the scheme, the electromagnet of the electromagnetic anchor is powered on by determining the specific position to be cut of the clamped oil pipe according to the requirements of field personnel, so that the electromagnetic anchor works and the motor is anchored on the inner wall of the cut oil pipe. Then switch on motor power, motor work drives cutting dish rotation "but the inner wall of oil pipe is more smooth can produce vibrations when cutting and lead to the motor to slide down, if installation slipmat in one side of the electromagnetic anchor easily reduces the adsorption effect of electromagnetic anchor, the diameter of oil well is different and is inconvenient for fixing and" motor work drives cutting dish rotation when cutting next oil well, the cutting piece of cutting dish is under the effect of centrifugal force, overcome the spring pulling force of spring, outwards rotate around the fixed axle, the cutting tooth cuts oil pipe operation, until oil pipe cuts off "when the oil well internal diameter is great, the cutting tooth is opened and is cut and can not be to the wall of a well, it is comparatively hard and inconvenient to exert its biggest efficiency to open when the oil well internal diameter is less. How to develop a grinding type downhole cutter to improve these problems is a urgent problem for those skilled in the art.

Disclosure of Invention

In order to overcome the defects, the utility model provides a grinding type downhole cutter, which aims to solve the problems that when the inner wall of an oil pipe is smoother, vibration can be generated when cutting is performed, a motor is slipped down, if an anti-slip pad is arranged on one side of an electromagnetic anchor, the adsorption effect of the electromagnetic anchor is easy to be reduced, when the next oil well is cut, the diameter of the oil well is different, the fixation is inconvenient, when the inner diameter of the oil well is larger, the cutting teeth are opened, the well wall cannot be cut, and when the inner diameter of the oil well is smaller, the cutting teeth are opened more hard, and the maximum efficacy of the cutting teeth cannot be conveniently exerted.

The utility model is realized in the following way: a grinding type underground cutter comprises a fixed limiting mechanism and a cutting mechanism.

The fixed limiting mechanism comprises a lifting part and a fixing part, wherein the fixing part is arranged in the lifting part in a sliding manner and used for limiting extrusion with a well wall. The cutting mechanism comprises an auxiliary piece and a cutting piece, wherein the auxiliary piece is fixedly installed below the lifting piece, the cutting piece is installed below the auxiliary piece, and the cutting piece is matched with the auxiliary piece to cut the pipe wall.

In a preferred technical scheme of the utility model, the lifting part comprises a limiting disc and a bottom plate, wherein the limiting disc is fixedly arranged above the bottom plate, and a connecting ring is fixedly arranged in the middle of the top of the limiting disc.

In a preferred technical scheme of the utility model, the fixing piece comprises an extrusion block, a threaded rod, a limiting ring, an internal thread cylinder, a limiting block, a connecting bevel gear, a transmission bevel gear and a first servo motor, wherein the extrusion block is embedded and arranged on one side of the limiting disc, one end of the threaded rod penetrates through the limiting disc and the other end of the extrusion block in a sliding manner and is in threaded connection with the internal thread cylinder, the connecting bevel gear is fixedly arranged at one end, far away from the threaded rod, of the internal thread cylinder, the first servo motor is fixedly embedded and arranged in the center of the top of the bottom plate, the transmission bevel gear is fixedly arranged on a rotating shaft of the first servo motor and is correspondingly meshed with the connecting bevel gear, three groups of the extrusion block, the threaded rod, the internal thread cylinder and the connecting bevel gear are uniformly and uniformly arranged above the bottom plate in an equal division manner, the three connecting bevel gears are meshed and arranged below the internal thread cylinder is rotatably and limited and arranged on the bottom plate through the limiting block, and the transmission bevel gear is slidingly and limited and arranged on the bottom plate through the limiting ring.

In a preferred technical scheme of the utility model, the bottom of the limiting block is fixedly arranged on the bottom plate, at least two bearings are arranged above the limiting block, the outer ring of each bearing is fixedly arranged below the limiting block, and the outer part of the internal thread cylinder is fixedly connected with the bearing.

In a preferred technical scheme of the utility model, the extrusion block is arranged in an arc shape and is arranged in an arc direction outside the bottom plate, the outside of the extrusion block is provided with rubber, and anti-skid patterns are carved on the rubber.

In a preferred technical scheme of the utility model, the bottom of the limiting ring is fixedly arranged above the bottom plate and is in annular sliding connection with the threaded rod.

In a preferred technical scheme of the utility model, the threaded rod is provided with two sections, one section is provided with threads, the other section is provided with a sliding rod, the diameter of the sliding rod is smaller than that of the threaded section, and the length of the sliding rod is larger than that of the threaded section.

In a preferred technical scheme of the utility model, the auxiliary piece comprises a tapered roller bearing, a mounting plate, a transmission gear and a second servo motor, wherein an outer ring at one end of the tapered roller bearing is fixedly arranged at the inner ring at the other end of the bottom plate through a connecting block and is fixedly connected with the mounting plate through the connecting block, the transmission gear is fixedly connected with the center of the top of the mounting plate, and the second servo motor is fixedly arranged at the bottom of the bottom plate and is in meshed connection with the transmission gear through a gear.

In a preferred technical scheme of the utility model, the cutting piece comprises a sliding table, a protective shell, a motor and a cutting piece, wherein the sliding table is fixedly arranged at the bottom of the mounting plate, the protective shell is fixedly connected with the sliding table, the motor is fixedly arranged in the protective shell, and the cutting piece is fixedly connected with a rotating shaft of the motor.

In a preferred technical scheme of the utility model, a groove is formed in the bottom of the mounting plate, the sliding table is fixedly mounted in the groove of the mounting plate, and a connecting piece is arranged between the cutting piece and the motor.

The beneficial effects of the utility model are as follows: according to the grinding type downhole cutter obtained through the design, when the grinding type downhole cutter is used, the first servo motor rotates to enable the transmission bevel gear and the connecting bevel gear to drive the internal thread cylinder to rotate in cooperation with the limiting block, the threaded cylinder rotates to drive the threaded rod to stretch and retract to enable the extrusion block to be tightly attached to the inner wall of the well, the motor is started to drive the cutting piece to rotate, then the sliding table drives the protective shell to be close to the well wall to cut the well wall, meanwhile, the second servo motor drives the transmission gear to enable the mounting plate to drive the cutting piece to rotate around the center of the mounting plate to cut the pipe wall in cooperation with the tapered roller bearing, so that the well walls with different diameters can be conveniently fixed, and the cutting distance can be conveniently adjusted according to the diameters of the well, so that the maximum effect of the cutting piece is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a side structure provided by an embodiment of the present utility model;

FIG. 2 is a schematic view of another structure according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of a cutting mechanism according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of an internal structure of a fixing and limiting mechanism according to an embodiment of the present utility model.

In the figure: 100-fixing a limiting mechanism; 110-lifting member; 111-limiting plates; 112-a bottom plate; 120-fixing piece; 121-extruding a block; 122-a threaded rod; 123-limiting rings; 124-an internal thread cylinder; 125-limiting blocks; 126-connecting bevel gears; 127-drive bevel gear; 128-a first servomotor; 200-a cutting mechanism; 210-auxiliary piece; 211-tapered roller bearings; 212-mounting plates; 213-a transmission gear; 214-a second servomotor; 220-cutting member; 221-sliding table; 222-a protective shell; 223-motor; 224-cutting the sheet.

Description of the embodiments

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

Referring to fig. 1, the present utility model provides a technical solution: a grinding type downhole cutter comprises a fixed limiting mechanism 100 and a cutting mechanism 200.

Referring to fig. 2, the fixing and limiting mechanism 100 includes a lifting member 110 and a fixing member 120, where the fixing member 120 is slidably disposed in the lifting member 110 and is used for limiting the extrusion of the well wall, and the extrusion of the well wall by the expansion and contraction of the fixing member 120 is used for fixing the cutting mechanism 200 to prevent the cutting mechanism 200 from vibrating to cause the fixing member 120 to slide down.

The cutting mechanism 200 comprises an auxiliary piece 210 and a cutting piece 220, wherein the auxiliary piece 210 is fixedly installed below the lifting piece 110, the cutting piece 220 is installed below the auxiliary piece 210, the cutting piece 220 is matched with the auxiliary piece 210 to cut a pipe wall, the cutting piece 220 is used for moving to be close to a well wall, the auxiliary piece 210 drives the cutting piece 220 to rotate to cut the pipe wall, and the auxiliary piece 210 drives the cutting piece 220 to rotate forward by 180 degrees to cut and then return to reverse by 180 degrees to cut so as to prevent wires from winding.

Referring to fig. 5, the lifting member 110 includes a limiting plate 111 and a bottom plate 112, the limiting plate 111 is fixedly mounted above the bottom plate 112, and a connecting ring is fixedly disposed in the middle of the top of the limiting plate 111 and is used for connecting with lifting equipment above.

Referring to fig. 3 and 5, the fixing member 120 includes a pressing block 121, a threaded rod 122, a limiting ring 123, an internal thread cylinder 124, a limiting block 125, a connection bevel gear 126, a transmission bevel gear 127 and a first servo motor 128, the pressing block 121 is embedded in one side of the limiting disc 111, one end of the threaded rod 122 is slidably and fixedly connected with the limiting disc 111 and the pressing block 121, the other end is slidably and fixedly connected with the internal thread cylinder 124, the connection bevel gear 126 is fixedly mounted at one end of the internal thread cylinder 124 far away from the threaded rod 122, the first servo motor 128 is fixedly embedded in the center of the top of the bottom plate 112, the transmission bevel gear 127 is fixedly mounted on the rotating shaft of the first servo motor 128 and is correspondingly meshed with the connection bevel gear 126, the pressing block 121, the threaded rod 122, the internal thread cylinder 124 and the connection bevel gear 126 are uniformly and equally distributed above the bottom plate 112, the three connection bevel gears 126 are meshed with the transmission bevel gear 127, the lower part of the internal thread cylinder 124 is rotatably and fixedly mounted on the bottom plate 112 through the limiting block 125, the threaded rod 122 is slidably and fixedly mounted on the bottom plate 112 through the limiting ring 123, and the first servo motor 128 drives the transmission bevel gear 127 to drive the internal thread cylinder 124 to rotate through the connection bevel gear 126 to drive the connection bevel gear 126 to move in a matched manner to rotate the limiting block 125 to complete the telescopic movement.

The bottom fixed mounting in bottom plate 112 of stopper 125, the top of stopper 125 is provided with two bearings at least and the outer lane fixed mounting of bearing is in the below of stopper 125, and the outside and the bearing fixed connection of internal thread section of thick bamboo 124, stopper 125 are used for keeping steady when making internal thread section of thick bamboo 124 pivoted. The extrusion piece 121 sets up the outside of arc to bottom plate 112 for the arc, and the outside of extrusion piece 121 is rubber setting and last anti-skidding line of carving of rubber, and rubber has certain cushioning effect and reduces its possibility that leads to the gliding because of vibrations, and the arc setting is convenient for increase with the area of contact between the wall of a well makes fixed effect better. The bottom of the limiting ring 123 is fixedly arranged above the bottom plate 112 and is in sliding connection with the threaded rod 122, and a strip-shaped sliding block and the bottom of a sliding rod of the threaded rod 122 are arranged below the inside of the limiting ring 123 and are correspondingly embedded, so that the threaded rod 122 only slides forwards and backwards to limit the rotation of the threaded rod 122. The threaded rod 122 is provided with a section which is threaded and another section which is a sliding rod, the diameter of the sliding rod is smaller than that of the threaded section, and the length of the sliding rod is larger than that of the threaded section, and the sliding rod is used for enabling the threaded rod 122 to be convenient to stretch and retract so as to squeeze the well wall and fix the cutting mechanism 200.

Referring to fig. 4 and 5, the auxiliary member 210 includes a tapered roller bearing 211, a mounting plate 212, a transmission gear 213 and a second servo motor 214, wherein an outer ring at one end of the tapered roller bearing 211 is fixedly mounted on an inner ring at the other end of the bottom plate 112 through a connecting block, and is fixedly connected with the mounting plate 212 through the connecting block, the transmission gear 213 is fixedly connected with the center of the top of the mounting plate 212, the second servo motor 214 is fixedly mounted on the bottom of the bottom plate 112 and is engaged with the transmission gear 213 through a gear, the second servo motor 214 is convenient to control the rotation speed so that the transmission gear 213 drives the mounting plate 212 to slowly rotate as required, and the second servo motor 214 drives the transmission gear 213 to enable the mounting plate 212 to positively rotate 180 degrees and then to turn 180 degrees for being matched with the cutting member 220 to cut so as to prevent wires from winding.

Referring to fig. 3 and 4, the cutting member 220 includes a sliding table 221, a protecting shell 222, a motor 223 and a cutting blade 224, the sliding table 221 is fixedly installed at the bottom of the mounting plate 212, the protecting shell 222 is fixedly connected with the sliding table 221, the motor 223 is fixedly installed in the protecting shell 222, the cutting blade 224 is fixedly connected with a rotating shaft of the motor 223, and the protecting shell 222 and the motor 223 are driven to move by controlling the sliding table 221 so that the motor 223 is close to a well wall to drive the cutting blade 224 to cut, so that wells with different sizes can be cut conveniently. The bottom of mounting panel 212 is provided with the recess, and slip table 221 fixed mounting is in the recess of mounting panel 212, is provided with the connecting piece between cutting piece 224 and the motor 223 and is convenient for dismantle the change to cutting piece 224.

Working principle: the limiting disc 111 is connected through a steel wire rope, the fixed limiting mechanism 100 and the cutting mechanism 200 are powered by connecting wires, the first servo motor 128 is controlled to fall to a proper position through the control of the single chip microcomputer, the transmission bevel gear 127 and the connection bevel gear 126 drive the internal thread cylinder 124 to rotate in cooperation with the limiting block 125, the threaded rod 122 and the internal thread cylinder 124 are in threaded connection and limited by the limiting ring 123, the threaded rod 122 can only slide forwards and backwards, the internal thread cylinder 124 rotates to drive the threaded rod 122 to stretch out and draw back, the extrusion block 121 is tightly fixed on the inner wall of a well, the motor 223 is started to drive the cutting plate 224 to rotate, the protective shell 222 is driven by the sliding table 221 to approach the well wall to cut the well wall, meanwhile, the second servo motor 214 drives the transmission gear 213 to drive the mounting plate 212 to rotate in cooperation with the tapered roller bearing 211 to drive the cutting plate 224 to tangent the pipe wall around the circle center of the mounting plate 212, and the cutting plate is reversed cut 180 degrees after the cutting is completed.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A grinding type downhole cutter, comprising

The fixed limiting mechanism comprises a lifting part and a fixing part, and the fixing part is arranged in the lifting part in a sliding manner and used for limiting extrusion with a well wall;

the cutting mechanism comprises an auxiliary piece and a cutting piece, wherein the auxiliary piece is fixedly installed below the lifting piece, the cutting piece is installed below the auxiliary piece, and the cutting piece is matched with the auxiliary piece to cut the pipe wall.

2. A grinding type downhole cutter as defined in claim 1, wherein: the lifting part comprises a limiting disc and a bottom plate, wherein the limiting disc is fixedly arranged above the bottom plate, and a connecting ring is fixedly arranged in the middle of the top of the limiting disc.

3. A grinding type downhole cutter as defined in claim 2, wherein: the fixing piece comprises an extrusion block, a threaded rod, a limiting ring, an internal thread cylinder, a limiting block, a connecting bevel gear, a transmission bevel gear and a first servo motor, wherein the extrusion block is embedded in one side of the limiting disc, one end of the threaded rod penetrates through the limiting disc in a sliding mode and is fixedly connected with the other end of the extrusion block and is in threaded connection with the internal thread cylinder, one end of the threaded rod, which is far away from the internal thread cylinder, is fixedly provided with the connecting bevel gear, the first servo motor is fixedly embedded in the center of the top of the bottom plate, the transmission bevel gear is fixedly installed in the rotating shaft of the first servo motor and is in corresponding meshing arrangement with the connecting bevel gear, the extrusion block, the threaded rod, the internal thread cylinder and the connecting bevel gear are evenly and equally distributed in three groups are arranged above the bottom plate, the three connecting bevel gears are evenly meshed with the transmission bevel gear, the lower portion of the internal thread cylinder is installed on the bottom plate in a sliding mode through the limiting ring.

4. A abrasive downhole cutter according to claim 3, wherein: the bottom of stopper fixed mounting in the bottom plate, the top of stopper is provided with two bearings at least and the outer lane fixed mounting of bearing in the below of stopper, the outside and the bearing fixed connection of internal thread section of thick bamboo.

5. A abrasive downhole cutter according to claim 3, wherein: the extrusion block is arc-shaped and is arranged towards the outside of the bottom plate, and the outside of the extrusion block is rubber and is provided with anti-skid patterns.

6. A abrasive downhole cutter according to claim 3, wherein: the bottom of the limiting ring is fixedly arranged above the bottom plate and is in annular shape and in sliding connection with the threaded rod.

7. A abrasive downhole cutter according to claim 6, wherein: the threaded rod is provided with two sections, one section is provided with threads, the other section is provided with a sliding rod, the diameter of the sliding rod is smaller than that of the threaded section, and the length of the sliding rod is larger than that of the threaded section.

8. A grinding type downhole cutter as defined in claim 7, wherein: the auxiliary piece comprises a tapered roller bearing, a mounting plate, a transmission gear and a second servo motor, wherein an outer ring at one end of the tapered roller bearing is fixedly mounted on an inner ring at the other end of the bottom plate through a connecting block and is fixedly connected with the mounting plate through the connecting block, the transmission gear is fixedly connected with the center of the top of the mounting plate, and the second servo motor is fixedly mounted on the bottom of the bottom plate and is in meshed connection with the transmission gear through a gear.

9. A grinding type downhole cutter as defined in claim 8, wherein: the cutting piece includes slip table, protecting crust, motor and cutting piece, slip table fixed mounting in the bottom of mounting panel, the protecting crust with slip table fixed connection, motor fixed mounting in the inside of protecting crust, the cutting piece with the pivot fixed connection of motor.

10. A grinding type downhole cutter as defined in claim 9, wherein: the bottom of mounting panel is provided with the recess, slip table fixed mounting in the recess of mounting panel, the cutting piece with be provided with the connecting piece between the motor.