Electric adjustable downhole instrument cutting, centralizing and anchoring device

Abstract

The invention discloses an electric adjustable downhole instrument cutting, centralizing and anchoring device, and relates to the technical field of petroleum engineering, the electric adjustable downhole instrument cutting, centralizing and anchoring device comprises a cylindrical shell and an external control system, the end part of the shell is rotatably connected with a rotating column, and the rotating column and a driving shaft of a driving motor are fixedly mounted; a plurality of sets of cutting blades are annularly arranged in the rotating column at equal intervals, and the same control mechanism is arranged between the multiple sets of cutting blades. According to the electric adjustable downhole instrument cutting, centralizing and anchoring device, the multiple centralizing blocks are arranged at multiple points in the shape of a circular ring, so that after the whole device enters a pipeline, the influence of local potholes on overall centralizing of the device can be effectively reduced, the whole device can be centralized more quickly under driving of the driving mechanism, and in addition, the centralizing efficiency is improved. And under the cooperation of anchoring teeth on the surface of the centralizing block, the whole device can be stably supported, so that the stability in the cutting process is better.

Description

Technical Field

[0001] The invention relates to petroleum engineering technology, in particular to an electrically adjustable downhole instrument cutting, straightening and anchoring device. Background Art

[0002] In the process of oil drilling and oilfield operation, various engineering accidents are inevitable, such as drill pipe stuck, oil casing deformation, etc. In order to solve the above problems, the method of pipe string cutting is often used to cut the stuck and deformed pipe string, and then perform well repair operations.

[0003] A Chinese invention patent with publication number CN114607305A discloses a downhole pipe string cutting device, which sends a cutting knife arranged at the end of a housing into the pipe to be cut, and after reaching a specified position, controls the cutting blade to extend and drives it to rotate to cut the pipe. However, in actual application, due to the deviation between the size value of the housing for installing the cutting knife and the inner wall of the pipe, it lacks straightening and anchoring during the actual cutting process, resulting in insufficient stability during the cutting process. A Chinese invention patent with publication number CN110695439B discloses a downhole oil pipe cutting device, and during the cutting process, the cutting knife extends out of the housing and abuts against the inner wall of the pipe. The connection of connecting rod 1 and connecting rod 2 cooperates to support the overall mechanism, which can play a role in stabilizing cutting to a certain extent. However, in actual application, oil is transported inside the oil pipe for a long time. Under the influence of high-speed flowing oil, corrosion of various chemical substances or high temperature and high pressure environment, the inner wall of the oil pipe will become bumpy. Therefore, only through the cooperation of connecting rod 1 and connecting rod 2 on both sides, it is impossible to properly straighten and anchor the working cutting unit, so that during the working process, it is not only insufficiently stable and unable to ensure normal and stable cutting, but also prone to the cutting blade tilting, which makes the cutting blade easy to break during the cutting process, which is not conducive to the oil pipe cutting and maintenance work. Summary of the invention

[0004] The purpose of the present invention is to provide an electrically adjustable downhole instrument cutting and straightening anchoring device to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electrically adjustable downhole instrument cutting and straightening anchoring device, comprising a cylindrical shell and an external control system, a cutting unit is arranged at the end of the shell, the cutting unit comprises a driving motor installed inside the shell, a rotating column is rotatably connected to the end of the shell, the rotating column is fixedly installed with a driving shaft of the driving motor, a plurality of groups of cutting blades are equidistantly arranged in a circular ring inside the rotating column, the same control mechanism is arranged between the plurality of groups of cutting blades, and the control mechanism is used to control the plurality of groups of cutting blades to synchronously move outward to the outside of the rotating column; The inside of the shell is provided with two groups of guide grooves spaced apart along the length direction thereof, the number of the guide grooves in each group is six, and the six guide grooves in each group are equidistantly distributed on the surface of the shell in a circular ring shape around the central axis of the shell, the inner side surface of the guide groove is slidably connected with a guide block, and the same driving mechanism is installed between all the guide blocks, and the driving mechanism is used to drive all the guide blocks to move synchronously; The inner side surface of the guide block is slidably connected with an auxiliary plate and a pressure plate in sequence, a pressure sensor is installed between the auxiliary plate and the pressure plate, a pressure spring is fixedly connected to the surface of the pressure plate, the end of the pressure spring is fixedly connected to the straightening block, a plurality of anchoring teeth are installed on the surface of the straightening block, an auxiliary cylinder is fixedly installed on the surface of the guide block, the telescopic end of the auxiliary cylinder passes through the surface of the guide block and is fixedly connected to the auxiliary plate, and the pressure sensor and the auxiliary cylinder are electrically connected to an external control system.

[0006] Furthermore, the driving mechanism includes a guide groove opened inside the shell, the inner side of the guide groove is slidably connected with a transmission rod, a connecting rod is rotatably connected between the transmission rod and the guide block, and a driving cylinder is fixedly installed inside the shell, and the telescopic end of the driving cylinder is fixedly connected to the transmission rod.

[0007] Furthermore, one end of the connecting rod close to the transmission rod is arranged to be tilted upward.

[0008] Furthermore, when the driving cylinder drives the guide block to move into the guide groove, the end surface of the anchoring tooth is flush with the outer side surface of the shell.

[0009] Furthermore, the control mechanism includes a receiving groove equidistantly arranged in a circular ring shape on the side of the rotating column, the cutting blade is slidably connected to the inner side of the receiving groove, a driving cavity is arranged inside the rotating column, the inner side of the driving cavity is rotatably connected to a driving disk, the surface of the driving disk is arranged with an arc groove corresponding to the cutting blade, the surface of the cutting blade is fixedly connected with a short column, the surface of the driving cavity is arranged with a straight groove, and the short column is slidably connected to the straight groove and the inner side of the arc groove.

[0010] Furthermore, a working chamber is provided inside the rotating column, which is located on the side of the driving chamber away from the cutting blade. The inner side surface of the working chamber is rotatably connected to a gear coaxially fixedly connected to the driving disk. The inner side surface of the working chamber is slidably connected to a toothed plate, which meshes with the gear.

[0011] Furthermore, a pressure groove is provided on the surface of the tooth plate, and a pressure block is slidably connected to the inner side surface of the pressure groove. A pressure relief spring is fixedly connected between the pressure block and the inner wall of the pressure groove. An adjusting cylinder is fixedly installed inside the working chamber, and the telescopic end of the adjusting cylinder is fixedly connected to the pressure block.

[0012] Furthermore, the pressure block is arranged at an end of the pressure relief spring away from the gear.

[0013] Furthermore, the receiving groove includes a guiding straight groove section and a receiving section, the cutting blade includes a guiding section and a blade segment, the shape and size specifications of the guiding straight groove section are adapted to the guiding section, the shape and size specifications of the receiving section are adapted to the blade segment, and the guiding straight groove section is arranged parallel to the straight groove.

[0014] Compared with the prior art, the electrically adjustable downhole instrument cutting and straightening anchoring device provided by the present invention has the following beneficial effects: 1. The electrically adjustable downhole instrument cutting and straightening anchoring device has a plurality of straightening blocks arranged at multiple points in a circular ring shape, so that after the device as a whole enters the interior of the pipeline, the influence of local potholes on the straightening of the device as a whole can be effectively reduced, so that the device as a whole can be straightened more quickly under the drive of the driving mechanism, and the device as a whole can be stably supported with the cooperation of the anchoring teeth on the surface of the straightening block, so that the cutting process is more stable.

[0015] 2. The electrically adjustable downhole instrument cutting and straightening anchoring device can judge the state of the inner wall of the pipeline support according to the pressure value detected by the pressure sensor during the contact between the anchoring teeth and the inner wall of the pipeline through the mutual cooperation between the auxiliary cylinder, the auxiliary plate and the pressure sensor, and drive the auxiliary plate to move by the auxiliary cylinder to apply driving force to the straightening block, so that the anchoring teeth at the pits can contact the pipeline with a certain pressure, so that the anchoring teeth can provide more stable anchoring support for the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1A schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 A schematic diagram of the overall longitudinal cross-sectional structure provided by an embodiment of the present invention; Figure 3 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at A in the middle; Figure 4 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at B in the middle; Figure 5 A schematic diagram of a transverse cross-sectional structure of a housing provided in an embodiment of the present invention; Figure 6 A schematic diagram of the internal structure of a working chamber provided by an embodiment of the present invention; Figure 7 A schematic diagram of the internal structure of the driving chamber provided in an embodiment of the present invention.

[0018] Description of reference numerals: 1. Housing; 2. Cutting unit; 21. Driving motor; 22. Rotating column; 23. Cutting blade; 2301. Guide section; 2302. Blade segment; 3. Guide groove; 31. Guide block; 32. Auxiliary plate; 33. Pressure plate; 34. Pressure sensor; 35. Straightening block; 36. Anchoring tooth; 37. Auxiliary cylinder; 38. Pressure spring; 4. Guide groove; 41. Transmission rod; 42. Connecting rod; 43. Driving cylinder; 5. Receiving groove; 501. Guide straight groove section; 502. Receiving section; 51. Driving disk; 52. Arc groove; 53. Short column; 54. Straight groove; 55. Gear; 56. Tooth plate; 57. Adjusting cylinder; 58. Pressure groove; 59. Pressure block; 510. Pressure relief spring. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Example: See also Figure 1-Figure 7 An electrically adjustable downhole instrument cutting and straightening anchoring device comprises a cylindrical shell 1 and an external control system, a cutting unit 2 is arranged at the end of the shell 1, the cutting unit 2 comprises a driving motor 21 installed inside the shell 1, a rotating column 22 is rotatably connected to the end of the shell 1, the rotating column 22 is fixedly installed with the driving shaft of the driving motor 21, a plurality of groups of cutting blades 23 are arranged in annular shape and at equal intervals inside the rotating column 22, a same control mechanism is arranged between the plurality of groups of cutting blades 23, and the control mechanism is used to control the plurality of groups of cutting blades 23 to synchronously move outward to the outside of the rotating column 22; Two groups of guide grooves 3 are arranged inside the housing 1 along its length direction, each group of guide grooves 3 has six guide grooves 3, and the six guide grooves 3 in each group are equidistantly distributed on the surface of the housing 1 in a circular ring shape around the central axis of the housing 1, and the inner side of the guide groove 3 is slidably connected with a guide block 31, and the same driving mechanism is installed between all the guide blocks 31, and the driving mechanism is used to drive all the guide blocks 31 to move synchronously; The inner side surface of the guide block 31 is slidably connected with an auxiliary plate 32 and a pressure plate 33 in sequence, a pressure sensor 34 is installed between the auxiliary plate 32 and the pressure plate 33, a pressure spring 38 is fixedly connected to the surface of the pressure plate 33, the end of the pressure spring 38 is fixedly connected to a straightening block 35, a plurality of anchoring teeth 36 are installed on the surface of the straightening block 35, an auxiliary cylinder 37 is fixedly installed on the surface of the guide block 31, the telescopic end of the auxiliary cylinder 37 penetrates the surface of the guide block 31 and is fixedly connected to the auxiliary plate 32, and the telescopic end of the auxiliary cylinder 37 can be slidably connected to the inner wall of the guide block 31 when penetrating, and the pressure sensor 34 and the auxiliary cylinder 37 are both electrically connected to an external control system.

[0021] It should be noted that during the straightening process, the pressure sensor 34 can transmit the detected pressure value to the external control system. The operator can determine whether the anchor teeth 36 on all the straightening blocks 35 are in contact with the inner wall of the pipe based on the pressure values ​​measured by all the pressure sensors 34 received by the external control system. At the same time, the operator can also determine whether one or more anchor teeth 36 encounter a pitted surface based on the pressure value, so that the auxiliary cylinder 37 at the corresponding position can be controlled by the external control system to drive the anchor tooth 36 to continue moving or apply greater pressure to the anchor tooth 36 to ensure that all anchor teeth 36 are in a state of stable contact with the inner wall of the pipe.

[0022] In this embodiment, the driving mechanism includes a guide groove 4 opened inside the outer shell 1, and the inner side surface of the guide groove 4 is slidably connected with a transmission rod 41, and a connecting rod 42 is rotatably connected between the transmission rod 41 and the guide block 31. A driving cylinder 43 is fixedly installed inside the outer shell 1, and the telescopic end of the driving cylinder 43 is fixedly connected to the transmission rod 41.

[0023] It should be supplemented that one end of the connecting rod 42 close to the transmission rod 41 is tilted upward, so that when the transmission rod 41 moves downward, with the cooperation of the connecting rod 42, the transmission rod 41 can push the guide block 31 to move outside the guide groove 3.

[0024] It should be noted that when the driving cylinder 43 drives the guide block 31 to move into the guide groove 3, the end face of the anchoring tooth 36 is flush with the outer side surface of the outer shell 1, so that the surface formed by the outer side end of the anchoring tooth 36 arranged on the same straightening block 35 is flush with the outer side surface of the outer shell 1, that is, the surface is in an arc shape, so that when it contacts the inner wall of the pipe, it can better fit with the inner wall of the pipe.

[0025] In this embodiment, the control mechanism includes a receiving groove 5 that is equidistantly arranged on the side of the rotating column 22 in a circular shape, the cutting blade 23 is slidably connected to the inner side of the receiving groove 5, a driving cavity is arranged inside the rotating column 22, and a driving disk 51 is rotatably connected to the inner side of the driving cavity, and an arc groove 52 corresponding to the cutting blade 23 is arranged on the surface of the driving disk 51, and a short column 53 is fixedly connected to the surface of the cutting blade 23, and a straight groove 54 is arranged on the surface of the driving cavity, and the short column 53 is slidably connected to the straight groove 54 and the inner side of the arc groove 52, and the rotating column 22 is arranged inside. The working chamber is located on the side of the driving chamber away from the cutting blade 23. The inner side surface of the working chamber is rotatably connected to a gear 55 coaxially fixedly connected to the driving disk 51. The inner side surface of the working chamber is slidably connected to a toothed plate 56. The toothed plate 56 meshes with the gear 55. A pressure groove 58 is opened on the surface of the toothed plate 56. A pressure block 59 is slidably connected to the inner side surface of the pressure groove 58. A pressure relief spring 510 is fixedly connected between the pressure block 59 and the inner wall of the pressure groove 58. An adjusting cylinder 57 is fixedly installed inside the working chamber. The telescopic end of the adjusting cylinder 57 is fixedly connected to the pressure block 59.

[0026] It should be noted that the sliding movement direction of the tooth plate 56 is parallel to the extension and retraction direction of the extension and retraction end of the regulating cylinder 57 .

[0027] It should be supplemented that the pressure block 59 is arranged at an end of the pressure relief spring 510 away from the gear 55 .

[0028] In this embodiment, the receiving groove 5 includes a guiding straight groove section 501 and a receiving section 502, and the cutting blade 23 includes a guiding section 2301 and a blade segment 2302. The shape and size specifications of the guiding straight groove section 501 are adapted to the guiding section 2301, and the shape and size specifications of the receiving section 502 are adapted to the blade segment 2302. The guiding straight groove section 501 is arranged parallel to the straight groove 54.

[0029] It should be noted that, with the cooperation between the guiding straight groove section 501 and the guiding section 2301 , the cutting blade 23 can be stably supported during the cutting process, so that the cutting operation can be performed smoothly.

[0030] When in use, when the housing 1 is placed as a whole at a designated position inside the pipe, the transmission rod 41 is driven by the driving cylinder 43 to move toward one end close to the rotating column 22. Under the transmission action of the connecting rod 42, the movement of the transmission rod 41 can drive the guide block 31 to slide along the inner side of the guide groove 3 and move toward the outside of the guide groove 3. The movement of the guide block 31 drives the straightening block 35 and the anchoring tooth 36 to move synchronously. When the anchoring tooth 36 moves to contact the inner wall of the pipe, it no longer moves. At this time, the guide block 31 continues to move and moves relative to the straightening block 35, so that the pressure spring 38 is compressed. At this time, the pressure sensor 34 detects the contact pressure between the anchoring tooth 36 and the inner wall of the pipe and transmits it to the external control system. When the inner wall of the pipeline is flat, at this time, all the pressure values ​​received by the external control system are consistent. When the pressure value is less than the other pressure values ​​or no pressure value is detected, the inner wall of the pipeline at the pressure sensor 34 appears potholes or is uneven. At this time, the auxiliary cylinder 37 at this location is controlled by the external control system to drive the auxiliary plate 32 to move. The movement of the auxiliary plate 32 drives the pressure plate 33 and the straightening block 35 and the anchoring tooth 36 to move synchronously, so that the anchoring tooth 36 can contact the inner wall of the pipeline, and the continued movement of the pressure plate 33 can compress the pressure spring 38 at this location, so that the contact pressure between the anchoring tooth 36 and the inner wall of the pipeline can be consistent with that at the other anchoring teeth 36, thereby effectively ensuring the overall working stability of the device; During cutting, the pressure block 59 is driven to move by adjusting the cylinder 57, and the movement of the pressure block 59 drives the pressure relief spring 510 and the tooth plate 56 to move synchronously, and the movement of the tooth plate 56 drives the gear 55 to rotate, and the rotation of the gear 55 drives the driving disk 51 to rotate. Under the coordinated guiding action of the arc groove 52 and the straight groove 54, when the driving disk 51 rotates, all the short columns 53 can be synchronously driven to move along the direction of the straight groove 54, and the movement of the short column 53 drives the cutting blade 23 to move outward synchronously. When the cutting blade 23 contacts the inner wall of the pipe, , start the drive motor 21, the drive motor 21 drives the rotating column 22 to rotate, the rotation of the rotating column 22 drives the cutting blade 23 to rotate to cut the pipeline, and under the drive of the adjusting cylinder 57, the pressure block 59 continues to move. When the cutting blade 23 is subjected to the movement resistance applied by the inner wall of the pipeline, its movement is blocked. At this time, the continued movement of the pressure block 59 will compress the pressure relief spring 510, so that there is always a certain pressure between the cutting blade 23 and the inner wall of the pipeline, thereby ensuring that the cutting blade 23 can completely cut off the pipeline.

[0031] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An electrically adjustable downhole instrument cutting and straightening anchoring device, comprising a cylindrical housing (1) and an external control system, characterized in that: A cutting unit (2) is arranged at the end of the housing (1), the cutting unit (2) comprising a driving motor (21) installed inside the housing (1), a rotating column (22) is rotatably connected to the end of the housing (1), the rotating column (22) is fixedly mounted to a driving shaft of the driving motor (21), a plurality of groups of cutting blades (23) are arranged in an annular shape at equal intervals inside the rotating column (22), the same control mechanism is arranged between the plurality of groups of cutting blades (23), the control mechanism is used to control the plurality of groups of cutting blades (23) to synchronously move outward to the outside of the rotating column (22); Two groups of guide grooves (3) are arranged at intervals inside the housing (1) along its length direction, each group of the guide grooves (3) has six guide grooves (3), and the six guide grooves (3) in each group are equidistantly distributed on the surface of the housing (1) in a circular ring shape around the central axis of the housing (1), the inner side surfaces of the guide grooves (3) are slidably connected to guide blocks (31), and the same driving mechanism is installed between all the guide blocks (31), and the driving mechanism is used to drive all the guide blocks (31) to move synchronously; The inner side surface of the guide block (31) is slidably connected to an auxiliary plate (32) and a pressure plate (33) in sequence, a pressure sensor (34) is installed between the auxiliary plate (32) and the pressure plate (33), a pressure spring (38) is fixedly connected to the surface of the pressure plate (33), an end of the pressure spring (38) is fixedly connected to a straightening block (35), a surface of the straightening block (35) is installed with a plurality of anchor teeth (36), an auxiliary cylinder (37) is fixedly installed on the surface of the guide block (31), a telescopic end of the auxiliary cylinder (37) passes through the surface of the guide block (31) and is fixedly connected to the auxiliary plate (32), and the pressure sensor (34) and the auxiliary cylinder (37) are both electrically connected to an external control system.

2. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 1 is characterized in that: The driving mechanism comprises a guide groove (4) provided inside the housing (1); a transmission rod (41) is slidably connected to the inner side surface of the guide groove (4); a connecting rod (42) is rotatably connected between the transmission rod (41) and the guide block (31); a driving cylinder (43) is fixedly installed inside the housing (1); and a telescopic end of the driving cylinder (43) is fixedly connected to the transmission rod (41).

3. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 2 is characterized in that: One end of the connecting rod (42) close to the transmission rod (41) is arranged to tilt upward.

4. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 3 is characterized in that: When the driving cylinder (43) drives the guide block (31) to move into the guide groove (3), the end surface of the anchoring tooth (36) is flush with the outer side surface of the housing (1).

5. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 1, characterized in that: The control mechanism comprises a receiving groove (5) which is equidistantly arranged in a circular ring shape on the side of the rotating column (22); the cutting blade (23) is slidably connected to the inner side surface of the receiving groove (5); a driving cavity is arranged inside the rotating column (22); a driving disk (51) is rotatably connected to the inner side surface of the driving cavity; an arc-shaped groove (52) corresponding to the cutting blade (23) is arranged on the surface of the driving disk (51); a short column (53) is fixedly connected to the surface of the cutting blade (23); a straight groove (54) is arranged on the surface of the driving cavity; the short column (53) is slidably connected to the straight groove (54) and the inner side surface of the arc-shaped groove (52).

6. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 5, characterized in that: A working chamber is provided inside the rotating column (22) and is located on a side of the driving chamber away from the cutting blade (23); the inner side surface of the working chamber is rotatably connected to a gear (55) coaxially fixedly connected to the driving disc (51); the inner side surface of the working chamber is slidably connected to a toothed plate (56), and the toothed plate (56) meshes with the gear (55).

7. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 6, characterized in that: A pressure groove (58) is provided on the surface of the tooth plate (56), and a pressure block (59) is slidably connected to the inner side surface of the pressure groove (58), and a pressure relief spring (510) is fixedly connected between the pressure block (59) and the inner wall of the pressure groove (58). An adjusting cylinder (57) is fixedly installed inside the working chamber, and the telescopic end of the adjusting cylinder (57) is fixedly connected to the pressure block (59).

8. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 7, characterized in that: The pressure block (59) is arranged at an end of the pressure relief spring (510) away from the gear (55).

9. The electrically adjustable downhole tool cutting and straightening anchoring device according to claim 8, characterized in that: The receiving groove (5) comprises a guiding straight groove section (501) and a receiving section (502); the cutting blade (23) comprises a guiding section (2301) and a blade section (2302); the shape and size of the guiding straight groove section (501) are compatible with the guiding section (2301); the shape and size of the receiving section (502) are compatible with the blade section (2302); the guiding straight groove section (501) is arranged in parallel with the straight groove (54).

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