Downhole workover operation self-righting fish fishing device

Abstract

The invention relates to a downhole workover operation self-righting fish salvage device. The downhole workover operation self-righting fish salvage device comprises a swimming conical head, a swimming generator, a power and sensing unit and an expansion grabbing unit. An omni-directional camera system is mounted on the salvaging device shell; according to the fishing device, the eccentric floating conical head is adopted, the floating conical head and the floating generator can rotate in the annular direction, so that the contact range of the center of the floating conical head is enlarged, and the floating conical head can be directly inserted into a fish falling pipe for centering and righting underground inclined tubular fish; the expansion grabbing unit comprises a telescopic clamping jaw unit, telescopic clamping jaws on the telescopic clamping jaw unit can move in two directions and can be controlled by ground workers, and when the fallen fish needs to be subjected to forward and reverse rotation for escape, the clamping jaws moving in the two directions can provide grabbing force in the forward direction and the reverse direction. The main working structures of the downhole workover operation self-righting fish fishing device are all mechanical structures, reliability is high, cost is low, and economic benefits are good.

Description

Technical Field

[0001] The invention belongs to the technical field of underground oil well repair tools, and in particular relates to a self-righting fish salvaging device for underground well repair operations. Background Art

[0002] At present, with the continuous deepening of drilling depth, underground accidents have become more frequent and complicated. Underground accidents have a great impact on drilling, cementing, and well repair work, and the harm is also very serious. If not handled properly, it will not only take a long time and cause great losses, but may even lead to the scrapping of oil and gas wells. Casing fracture accidents are relatively common during the cementing process. Due to the uneven gaps in the well, the casing will tilt in different directions after breaking. Traditional fish-dropping salvage devices usually use violent methods for repairs, trying to remove the damaged casing by increasing the pulling force, shaking the well, rotating, etc., but this has a certain probability of causing the casing to get stuck, which will undoubtedly increase the risk of scrapping oil and gas wells.

[0003] Therefore, based on these problems, it is very necessary to provide a fish-catching and salvaging device that can be used to center and guide the inclined casing, which can effectively improve the work efficiency of well repair operations and protect oil and gas wells, and has important practical significance. Summary of the invention

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] A self-righting fish salvaging device for well repair operations underground, comprising a swimming cone head, a swimming generator, a power and sensing unit, and an expansion gripping unit; and an omnidirectional camera system is installed on the shell of the salvaging device;

[0006] The swimming cone head is connected to the swimming generator through an eccentric shaft, the swimming generator is connected to the power and sensing unit, the power and sensing unit transmits the power to the swimming generator through the shaft, and the power and sensing unit is connected to the expansion grasping unit;

[0007] The salvage device adopts an eccentric swimming cone head, and the swimming cone head and the swimming generator can rotate in the annular direction respectively, so that the center reach range of the swimming cone head is increased. For the skewed tubular fish in the well, the swimming cone head can be directly inserted into the fish pipe for centering and straightening.

[0008] The expansion gripping unit comprises a telescopic claw unit, the telescopic claw on which can move in two directions and can be manipulated by ground staff. When it is necessary to rotate the fish forward and backward to free it, the bidirectionally movable claw can provide gripping force in both the forward and reverse directions.

[0009] Furthermore, the telescopic claw unit includes a cylinder body, a piston is installed in the cylinder body, a claw that can move axially is installed at one end of the piston, and a limit ring is installed at the liquid injection port of the cylinder body to prevent the piston from falling out of the cylinder.

[0010] Furthermore, a compression return spring is installed at one end of the cylinder body, and the compression return spring is connected to the piston to achieve the return of the piston.

[0011] Furthermore, the telescopic claw unit is fixedly connected to the fourth-stage shell, the external cover is fixedly connected to the fourth-stage shell, and the hydraulic pipe is fixedly connected to the external cover through a joint, so that hydraulic pressure can be injected into the interior of the expansion gripping unit.

[0012] Furthermore, an eccentric shaft is provided on the traveling cone head, the eccentric shaft is connected to the eccentric hole of the traveling generator, the eccentric shaft is connected to the transmission shaft through gear meshing transmission, and one end of the transmission shaft is fixedly connected to the output end of the hydraulic motor.

[0013] Furthermore, it also includes a planetary shaft, one end of which is rotatably mounted on the housing of the power and sensing unit, a planetary gear is mounted on the planetary shaft, and a third gear is also provided on the transmission center shaft, the third gear is meshed with the planetary gear, the planetary gear is meshed with the inner gear ring, and the outer ring of the inner gear ring is fixedly connected to the outer shell of the wandering generator.

[0014] Furthermore, the traveling generator comprises a primary shell, the primary shell has an eccentric hole, and the eccentric shaft passes through the eccentric hole and is rotatably connected to the primary shell.

[0015] Furthermore, the traveling generator also includes a secondary housing, which is fixedly connected to the primary housing, and the transmission center shaft passes through the secondary housing and is rotationally connected thereto via a bearing group.

[0016] Furthermore, there are a plurality of telescopic claw units, which are evenly distributed on the surface of the four-stage shell, and the directions in which the claws extend outward are not exactly the same.

[0017] Furthermore, the hydraulic motor is also connected to a liquid inlet pipe and a liquid outlet pipe, and is led out through the hollow section of the four-stage housing; the signal harness of the omnidirectional camera system is also led out through the hollow section of the four-stage housing.

[0018] The advantages and positive effects of the present invention are:

[0019] The self-righting fish salvaging device for well repair operations underground of the present invention adopts an eccentric swimming cone head design, so that the cone head is not limited to touching the center of the pipeline. Theoretically, the center of the cone head can touch a circle with the center of the pipeline as the center and a multiple of the eccentricity as the diameter, which greatly improves the movable range of the cone head. Combined with the omnidirectional camera system at the end of the device, for tilted tubular fish in the well, the cone head can be directly inserted into the fish pipe for centering and straightening, so as to better guide the fish to be salvaged; the telescopic claws on the device can be controlled by ground staff, and greater gripping force can be obtained by increasing the hydraulic pressure. When the fish needs to be rotated forward and backward to escape, the bidirectionally movable claws can provide gripping force in both forward and reverse directions; the main working structures of the self-righting fish salvaging device for well repair operations underground are all mechanical structures, with high reliability, low cost and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0021] FIG1( a ) is a schematic diagram of the appearance of a self-righting fish salvaging device for underground well repair operations provided by an embodiment of the present invention;

[0022] FIG1( b ) is a schematic diagram of the appearance of a self-righting fish salvaging device for underground well repair operations provided by an embodiment of the present invention;

[0023] Figure 2 A structural cross-sectional view of a self-righting fish salvaging device for underground well repair operations provided by an embodiment of the present invention;

[0024] Figure 3 A structural cross-sectional view of a self-righting fish salvaging device for underground well repair operations provided by an embodiment of the present invention;

[0025] Figure 4 A structural cross-sectional view of one of the telescopic claw units of the self-righting fish salvaging device for well repair operations provided in an embodiment of the present invention;

[0026] Figure 5 A structural cross-sectional view of one of the telescopic claw units of the self-righting fish salvaging device for well repair operations provided in an embodiment of the present invention;

[0027] Figure 6 A structural cross-sectional view of one of the telescopic claw units of the self-righting fish salvaging device for well repair operations provided in an embodiment of the present invention; DETAILED DESCRIPTION

[0028] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0030] Example 1

[0031] The self-righting fish salvaging device for well repair operations provided in this embodiment comprises a swimming cone head 1, a swimming generator 2, a power and sensing unit 3 and an expansion gripping unit 4; and an omnidirectional camera system is installed on the housing of the salvaging device;

[0032] The swimming cone head is connected to the swimming generator through an eccentric shaft, the swimming generator is connected to the power and sensing unit, the power and sensing unit transmits the power to the swimming generator through the shaft, and the power and sensing unit is connected to the expansion grasping unit;

[0033] The salvage device adopts an eccentric swimming cone head, and the swimming cone head and the swimming generator 2 can rotate in the annular direction, so that the center of the swimming cone head can reach a larger range. For the skewed tubular fish in the well, the swimming cone head can be directly inserted into the fish pipe for centering and straightening.

[0034] The expansion gripping unit 4 includes a telescopic claw unit 30. The telescopic claw on the telescopic claw unit 30 can move in both directions and can be controlled by ground staff. When it is necessary to rotate the fish forward and backward to escape, the bidirectionally movable claw can provide gripping force in both the forward and reverse directions.

[0035] The telescopic claw unit 30 includes a cylinder body 35, in which a piston 36 is installed, and one end of the piston 36 is equipped with a claw 37 that can move in the axial direction, and a limit ring 39 is installed at the injection port of the cylinder body to prevent the piston 36 from falling out of the cylinder; one end of the cylinder body 35 is equipped with a compression return spring 38, which is connected to the piston 36 to achieve the reset of the piston.

[0036] The telescopic claw unit 30 is welded and fixedly connected to the fourth-stage housing 29 , the external cover 31 is welded and fixedly connected to the fourth-stage housing 29 , and the hydraulic pipe 33 is fixedly connected to the external cover 31 through a joint, so that hydraulic pressure can be injected into the expansion gripping unit 4 .

[0037] Specifically, the traveling cone head 1 is provided with an eccentric shaft 101, which is connected to the eccentric hole of the traveling generator 2. The eccentric shaft is connected to the transmission center shaft 18 through gear meshing transmission, and one end of the transmission center shaft 18 is fixedly connected to the output end of the hydraulic motor 25.

[0038] It also includes a planetary shaft, one end of which is rotatably mounted on the housing of the power and sensing unit 3, a planetary gear is mounted on the planetary shaft, and a third gear 19 is also provided on the transmission center shaft 18, the third gear is meshed with the planetary gear, the planetary gear is meshed with the inner gear ring 17, the outer ring of the inner gear ring 17 is fixedly connected to the outer shell of the traveling generator 2, so that when the transmission center shaft 18 rotates, the planetary gear is driven to rotate, the planetary gear drives the inner gear ring to rotate, and the inner gear ring drives the outer shell of the traveling generator to rotate.

[0039] The traveling generator 2 includes a primary housing 5, which has an eccentric hole 201, and the eccentric shaft 101 passes through the eccentric hole 201 and is rotatably connected to the primary housing 5; the traveling generator 2 also includes a secondary housing 6, which is fixedly connected to the primary housing 5, and the transmission center shaft 18 passes through the secondary housing 6 and is rotatably connected to the secondary housing 6 through a bearing group.

[0040] There are several telescopic claw units 30, which are evenly distributed on the surface of the fourth-stage housing 29, and the directions in which the claws extend outward are not completely the same. Figure 4 , 5 , as shown in Figure 6.

[0041] The hydraulic motor 25 is also connected to a liquid inlet pipe 27 and a liquid outlet pipe 28 , and is led out through the hollow section of the four-stage housing 29 ; the signal harness 32 of the camera 34 is also led out through the hollow section of the four-stage housing 29 .

[0042] Specifically, in this embodiment, the traveling cone head 1 is connected to the traveling generator 2 through the eccentric shaft A, the first-stage housing 5 of the traveling generator 2 has an eccentric hole, the outer ring of the first bearing group 8 is installed on the eccentric hole, and the inner ring is connected to the eccentric shaft of the traveling cone head 1, the first bearing end cover 10 is fixedly installed on the first-stage housing 5, and its axial movement is limited by clamping the outer ring of the first bearing group 8, and the special-shaped nut 9 is fixedly installed on the eccentric shaft of the traveling cone head 1, and its axial movement is limited by clamping the inner ring of the first bearing group 8; in order to prevent the inside of the traveling generator 2 from being contaminated by gravel particles, a sealing felt 7 is arranged between the first-stage housing 5 and the eccentric shaft of the traveling cone head 1; the end step of the eccentric shaft of the traveling cone head 1 is fixedly installed with the first gear 11, and the end face is fixedly installed A first limiting gasket 12 is installed to limit the axial movement of the first gear 11. The first gear 11 is meshed with the second gear 13. The second gear 13 is fixed on the transmission shaft 18. The axial movement of the second gear 13 is limited by the second limiting gasket 14 fixed at the end of the transmission shaft 18. The transmission shaft 18 is connected to the secondary housing 6 through the second bearing 15. The second bearing end cover 16 is fixedly connected to the secondary housing 6. The third gear 19 is fixedly installed on the transmission shaft 18 and meshed with the planetary gear 20. There are three groups of the same planetary gears. The planetary gear 20 is meshed with the inner gear ring 17. The inner gear ring 17 is fixedly installed on the secondary housing 6. The primary housing 5 is fixedly connected to the secondary housing 6; the transmission shaft 18 is connected to the secondary housing 6 through the third bearing group 23 is connected to the third-stage housing 24 of the power and sensing unit 3, and the planetary shaft 21 of the planetary gear 20 is also connected to the third-stage housing 24 in the same way, so there are four sets of the same third bearing group 23, the third bearing end cover 26 is connected to the third-stage housing 24, fixing the outer ring of the third bearing group 23, and the round nut 22 is installed on the threaded step of the transmission center shaft 18 to fix the inner ring of the third bearing group 23; the end of the transmission center shaft 18 is connected to the hydraulic motor 25, and the hydraulic motor 25 is fixed on the third-stage housing 24, and the liquid inlet pipe 27 and the liquid outlet pipe 28 are connected to the hydraulic motor 25 through a joint, and are led out through the hollow section of the fourth-stage housing 29; four groups of cameras 34 are installed on the third-stage housing 24, which are evenly distributed at the end of the third-stage housing 24. The signal harness 32 of the camera 34 is also led out through the hollow section of the fourth-stage housing 29; the fourth-stage housing 29 of the expansion gripping unit 4 is fixedly connected to the third-stage housing 24, the cylinder body 35 of the telescopic claw unit 30 is welded to the fourth-stage housing 29, the external cover 31 is welded to the fourth-stage housing 29, and the hydraulic pipe 33 is fixedly connected to the external cover 31 through a joint, so that hydraulic pressure can be injected into the expansion gripping unit 4; a piston 36 is installed inside the cylinder body 35 of the telescopic claw unit 30, and a claw 37 that can move axially is installed at one end of the piston 36, a compression return spring 38 is installed at one end of the cylinder body 35, which is connected to the piston 36, and a limit ring 39 is installed at the other end to prevent the piston 36 from falling out of the cylinder.

[0043] The present invention relates to a fish salvage device, comprising a swimming cone head, a swimming generator, a power and sensing unit, and an expansion gripping unit. The swimming cone head is connected to the swimming generator through an eccentric shaft, the swimming generator is connected to the power and sensing unit, the power and sensing unit transmits power to the swimming generator through the shaft, and the power and sensing unit is connected to the expansion gripping unit. The device adopts an eccentric swimming cone head, which can make the center of the cone head touch a circle with the center of the pipeline as the center and multiple eccentric distances as the diameter, greatly improving the range of motion of the cone head. Combined with the omnidirectional camera system at the end of the device, for the skewed tubular fish in the well, the cone head can be directly inserted into the fish pipe for centering and straightening, so as to better guide the fish salvage. The telescopic claws on the device can be controlled by ground staff, and the greater the hydraulic pressure, the greater the gripping force can be obtained. When the fish needs to be rotated forward and backward to escape, the bidirectionally movable claws can provide gripping force in both forward and reverse directions.

[0044] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A self-righting fish salvaging device for underground well repair operations, characterized in that: It includes a swimming cone head, a swimming generator, a power and sensing unit, and an expansion grasping unit; and an omnidirectional camera system is installed on the shell of the salvage device; The swimming cone head is connected to the swimming generator through an eccentric shaft, the swimming generator is connected to the power and sensing unit, the power and sensing unit transmits the power to the swimming generator through the shaft, and the power and sensing unit is connected to the expansion grasping unit; The salvage device adopts an eccentric swimming cone head, and the swimming cone head and the swimming generator can rotate in the annular direction respectively, so that the center reach range of the swimming cone head is increased. For the skewed tubular fish in the well, the swimming cone head can be directly inserted into the fish pipe for centering and straightening. The expansion gripping unit comprises a telescopic claw unit, the telescopic claw on which can move in two directions and can be manipulated by ground staff. When it is necessary to rotate the fish forward and backward to free it, the bidirectionally movable claw can provide gripping force in both the forward and reverse directions.

2. The self-righting fish salvaging device for underground well repair operations according to claim 1 is characterized in that: The telescopic claw unit comprises a cylinder body, a piston is installed in the cylinder body, a claw movable in the axial direction is installed at one end of the piston, and a limiting ring is installed at the liquid injection port of the cylinder body to prevent the piston from falling out of the cylinder.

3. The self-righting fish salvaging device for underground well repair operations according to claim 1 is characterized in that: The telescopic claw unit is fixedly connected to the four-stage shell, the external cover is fixedly connected to the four-stage shell, and the hydraulic pipe is fixedly connected to the external cover through a joint, so that hydraulic pressure can be injected into the interior of the expansion gripping unit.

4. The self-righting fish salvaging device for underground well repair operations according to claim 3 is characterized in that: An eccentric shaft is arranged on the traveling cone head, the eccentric shaft is connected with the eccentric hole of the traveling generator, the eccentric shaft is connected with the transmission center shaft through gear meshing transmission, and one end of the transmission center shaft is fixedly connected with the output end of the hydraulic motor.

5. The self-righting fish salvaging device for underground well repair operations according to claim 4 is characterized in that: It also includes a planetary shaft, one end of which can be rotatably mounted on the housing of the power and sensing unit, a planetary gear is installed on the planetary shaft, and a third gear is also provided on the transmission center shaft. The third gear is meshed with the planetary gear, and the planetary gear is meshed with the inner gear ring. The outer ring of the inner gear ring is fixedly connected to the outer shell of the wandering generator.

6. The self-righting fish salvaging device for underground well repair operations according to claim 2, characterized in that: There are a plurality of telescopic claw units, which are evenly distributed on the surface of the four-stage shell, and the directions in which the claws extend outwards are not completely the same.

7. The self-righting fish salvaging device for underground well repair operations according to claim 2, characterized in that: A compression return spring is installed at one end of the cylinder body, and the compression return spring is connected to the piston to achieve the return of the piston.

8. The self-righting fish salvaging device for underground well repair operations according to claim 4, characterized in that: The traveling generator comprises a primary shell, which is provided with an eccentric hole, and the eccentric shaft passes through the eccentric hole and is rotatably connected with the primary shell.

9. The self-righting fish salvaging device for underground well repair operations according to claim 8, characterized in that: The traveling generator also includes a secondary housing, which is fixedly connected to the primary housing. The transmission center shaft passes through the secondary housing and is rotationally connected to the secondary housing via a bearing group.

10. The self-righting fish salvaging device for underground well repair operations according to claim 4, characterized in that: The hydraulic motor is also connected to a liquid inlet pipe and a liquid outlet pipe, and is led out through the hollow section of the four-stage housing; the signal harness of the omnidirectional camera system is also led out through the hollow section of the four-stage housing.

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