A backoff device for oil wells

Abstract

The application discloses an oil well reverse buckle device and belongs to the technical field of oil well machinery, which comprises an outer cylinder, a first guide gear, a second guide gear, a four-groove spline, a first five-tooth gear, a top of the first five-tooth gear, a second five-tooth gear, a spring connection between the second five-tooth gear and the second guide gear, a flat bearing, a first guide gear, a second guide gear, a first five-tooth gear, a second five-tooth gear, a flat bearing and a guide rail outer cylinder, and a reverse buckle shaft. The beneficial effects of the application are as follows: the new technology can improve the flexibility of construction operation to a certain extent, reduce the construction cost of connecting oil pipe operation, further save time and greatly improve the implementation effect of a health, safety and environmental management system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil well machinery, and particularly relates to an oil well back-off device. BACKGROUND

[0002] In recent years, with the continuous application and development of new technologies and new processes, downhole operation fishing technology has also developed rapidly. Currently, tubing fishing generally uses drill pipe to connect tubing to perform fishing operations in the downhole. However, with the increase of downhole fishing tools, the safety of downhole fishing operations is reduced. The present application provides an oil well back-off device to solve such problems, which ensures the safety and stability of downhole fishing operations and achieves the purpose of multiple fishing operations. SUMMARY

[0003] The technical problem to be solved by the present application is to solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] The oil well back-off device comprises an outer cylinder, which comprises a fixed outer cylinder, a stroke outer cylinder, a guide rail outer cylinder, a gear guide outer sleeve and a gear guide shaft outer sleeve, which are sequentially threadedly connected. An upper lifting power shaft is arranged in the fixed outer cylinder. A self-rotation guide rail is threadedly connected to the lower end of the upper lifting power shaft. A self-rotation shaft is slidably connected to the inside of the self-rotation guide rail. A first guide gear is fixedly connected to the lower end of the self-rotation shaft. The first guide gear meshes with a second guide gear. The second guide gear is sleeved on a four-groove spline. A first five-tooth gear is fixedly connected to the four-groove spline. The top of the first five-tooth gear meshes with a second five-tooth gear. A spring connection is arranged between the second five-tooth gear and the second guide gear through a groove. A flat bearing is fixedly connected in the gear guide shaft outer sleeve. The first guide gear, the second guide gear, the first five-tooth gear and the second five-tooth gear are arranged between the flat bearing and the lower end of the guide rail outer cylinder. A back-off shaft is arranged at the bottom end of the self-rotation shaft.

[0006] Water hole channels are formed in the inside of the upper lifting power shaft, the back-off shaft and the first guide gear.

[0007] A water outlet hole is formed in the middle of the upper lifting power shaft. A ball seat is arranged at the inner bottom of the upper lifting power shaft. A plugging ball is arranged in the ball seat.

[0008] Eight pipe sleeve fixing columns are arranged on the fixed outer cylinder. The pipe sleeve fixing columns are movably connected to the fixed outer cylinder through spring sheets. The spring sheets are circular sheets. The material of the spring sheets is spring steel. A base is fixedly connected to the bottom of the spring sheet. Anti-slip patterns are arranged at the top end of the pipe sleeve fixing column.

[0009] The inner part of the guide rail outer cylinder is provided with internal threads at both ends, the inner part of the guide rail outer cylinder is provided with a clamping groove at one end, the guide rail outer part is provided with a clamping block at one end, the guide rail outer cylinder and the guide rail are clamped through the clamping groove and the clamping block, the inner part of the guide rail outer cylinder is provided with internal threads at both ends, and the number of clamping blocks is four.

[0010] The self-rotation shaft is a spiral stripe, the inner wall of the self-rotation guide rail is provided with a sliding groove matched with the self-rotation shaft, and the guide rail of the sliding groove is five.

[0011] The upper end of the stroke outer cylinder is provided with internal threads, the lower end of the stroke outer cylinder is provided with external threads, and the top end of the lifting power shaft is fixedly connected with a pipe clamp.

[0012] The upper and lower ends of the fixed outer cylinder are provided with pressurized O-rings, the inner rings of the second five-toothed gear and the second guide gear are provided with protrusions, the second five-toothed gear and the second guide gear are matched with the four-groove spline, and the four-groove spline is provided with a chute matched with the protrusions.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] When the device is used, a suitable female cone or male cone is installed on the reverse buckle shaft, the device is hoisted into the oil well by the crane, and when the female cone or male cone is aligned with the oil pipe or drill pipe, the crane is used for reciprocating lifting and lowering. In this process, due to the weight of the device, the outer up-and-down stroke does not rotate when lifting or lowering, the lifting power shaft moves up and down along the sliding groove in the self-rotation guide rail, drives the first guide gear to rotate along the gear teeth, the second five-toothed gear and the second guide gear are provided with springs, the spring generates elastic force after being compressed, and the distance between the second five-toothed gear and the second guide gear is maintained, the gear teeth of the first guide gear and the second guide gear are staggered or engaged, thereby generating torque, so that the female cone or male cone rotates under the action of the torque, thereby connecting the pipe or drill pipe in the oil well with the threads on the female cone or male cone. After the reverse buckle is completed, the whole is lifted by the crane. The new technology can improve the flexibility of construction operation to a certain extent, reduce the construction cost of connecting oil pipe operation, further save time and greatly improve the implementation effect of health, safety and environmental management system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the external structure schematic diagram of the embodiment of the present application.

[0016] Figure 2 is the internal structure schematic diagram of the embodiment of the present application.

[0017] Figure 3is a structural schematic diagram of a fixed outer cylinder of an embodiment of the present application.

[0018] Figure 4 is a structural schematic diagram of a gear guide shaft outer sleeve of an embodiment of the present application.

[0019] Figure 5 is a structural schematic diagram of a stroke outer cylinder of an embodiment of the present application.

[0020] Figure 6 is a structural schematic diagram of a cross-sectional structure of a guide rail outer of an embodiment of the present application.

[0021] Figure 7 is a top view structural schematic diagram of a self-turning guide rail of an embodiment of the present application.

[0022] Figure 8 is a structural schematic diagram of a four-groove spline of an embodiment of the present application.

[0023] Figure 9 is a structural schematic diagram of a gear guide outer sleeve of an embodiment of the present application.

[0024] Figure 10 is a structural schematic diagram of a pipe sleeve fixing column of an embodiment of the present application.

[0025] Figure serial number and name: fixed outer cylinder 1, stroke outer cylinder 2, guide rail outer cylinder 3, gear guide shaft outer sleeve 4, lifting power shaft 5, self-turning guide rail 6, self-turning shaft 7, first guide gear 8, second guide gear 9, four-groove spline 10, first five-tooth gear 11, second five-tooth gear 12, spring 13, flat bearing 14, reverse buckle shaft 15, water hole passage 16, water outlet hole 17, ball seat 18, plugging ball 19, pipe sleeve fixing column 20, clamping groove 21, clamping block 22, sliding groove 23, pipe clamp 24, pressurized O-ring 25, spring sheet 26, gear guide outer sleeve 27, base 28. DETAILED DESCRIPTION

[0026] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments, which are intended to explain the present application, but not as a limitation of the present application.

[0027] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] Embodiment 1

[0029] As Figures 1-10As shown, the oil well is shown in the present application, including the outer tube, the outer tube includes fixed outer tube 1, stroke outer tube 2, guide rail outer tube 3, gear guide outer sleeve 27 and gear guide shaft sleeve 4, the fixed outer tube 1, stroke outer tube 2, guide rail outer tube 3, gear guide outer sleeve 27 and gear guide shaft sleeve 4 are connected in sequence, the fixed outer tube 1 is provided with lifting power shaft 5, the lower end of the lifting power shaft 5 is threadedly connected with the self-turning guide rail 6, the inside of the self-turning guide rail 6 is slidably connected with the self-turning shaft 7, the lower end of the self-turning shaft 7 is fixedly connected with the first guide gear 8, the first guide gear 8 engages the second guide gear 9, the second guide gear 9 is sleeved on the four-groove spline 10, the first five-tooth gear 11 is fixedly connected on the four-groove spline 10, the top of the first five-tooth gear 11 engages the second five-tooth gear 12, the second five-tooth gear 12 and the second guide gear 9 are connected by a spring 13 through a groove, the gear guide shaft sleeve 4 is fixedly connected with a flat bearing 14, the first guide gear 8, the second guide gear 9, the first five-tooth gear 11 and the second five-tooth gear 12 are arranged between the flat bearing 14 and the lower end of the guide rail outer tube 3, the bottom end of the self-turning shaft 7 is provided with a reverse thread shaft 15, the inside of the lifting power shaft 5, the reverse thread shaft 15 and the first guide gear 8 is provided with a water hole passage 16, the middle of the lifting power shaft 5 is provided with a water outlet hole 17, the inner bottom of the lifting power shaft 5 is provided with a ball seat 18, the ball seat 18 is provided with a plugging ball 19, eight pipe sleeve fixing columns 20 are arranged on the fixed outer tube 1, the pipe sleeve fixing columns 20 are movably connected with the fixed outer tube 1 through spring sheets 26, the spring sheets 26 are circular sheets, the material of the spring sheets 26 is spring steel, the bottom of the spring sheet 26 is fixedly connected with a base 28, the top end of the pipe sleeve fixing column 20 is provided with anti-skid lines, the inside of both ends of the guide rail outer tube 3 is provided with internal threads, the inside of one end of the guide rail outer tube 3 is provided with a clamping groove 21, one end of the outside of the self-turning guide rail 6 is provided with a clamping block 22, the guide rail outer tube 3 and the self-turning guide rail 6 are clamped through the clamping groove 21 and the clamping block 22, both ends of the inside of the guide rail outer tube 3 are provided with internal threads, the number of the clamping blocks 22 is four, the self-turning shaft 7 is a spiral stripe, the inner wall of the self-turning guide rail 6 is provided with a sliding groove 23 matched with the self-turning shaft 7, the guide rail of the sliding groove 23 is five, the upper end of the stroke outer tube 2 is provided with internal threads, the lower end of the stroke outer tube 2 is provided with external threads, the top end of the lifting power shaft 5 is fixedly connected with a pipe clamp 24, the upper and lower ends of the fixed outer tube 1 are provided with pressurizing O-rings 25, the inner rings of the second five-tooth gear 12 and the second guide gear 9 are provided with protrusions, the second five-tooth gear 12 and the second guide gear 9 are sleeved on the four-groove spline 10, the four-groove spline 10 is provided with a sliding groove matched with the protrusion.

[0030] When the device is used, the female or male cone suitable for fishing is installed on the reverse threaded shaft 15, the device is hoisted into the oil well by the crane, when the female or male cone is aligned with the oil pipe or drill pipe, the blocking ball 19 is put into the ball seat 18 to prevent pressure relief; the pipe sleeve fixing column 20 is extended outside the fixed outer cylinder 1 to fix the whole device, the pressure is 5-10 MPa; then the crane is used for reciprocating lifting and lowering, in this process, due to the weight of the device, the external up and down stroke does not rotate, the lifting power shaft 5 moves up and down along the sliding groove 23 inside the self-rotating guide rail 6, drives the first guide gear 8 to rotate along the gear teeth, since the spring 13 is arranged between the second five-tooth gear 12 and the second guide gear 9, and the spring 13 will generate elastic force after being compressed, the distance between the second five-tooth gear 12 and the second guide gear 9 is kept, the gear teeth of the first guide gear 11 and the second guide gear 12 are staggered or engaged, thereby generating torque force, so that the female or male cone rotates under the action of the torque force, so that the pipe or drill pipe in the oil well is connected with the threads on the female or male cone, after the reverse threading is completed, the whole device is lifted by the crane, the new technology can improve the flexibility of construction operation to a certain extent, reduce the construction cost of connecting oil pipe operation, further save time and greatly improve the implementation effect of health, safety and environmental management system.

[0031] The pipe sleeve fixing column 20 has eight, six of which are combined with the fixed outer cylinder 1 to fix the device and prevent rotation; the lowermost two serve as up and down floating positioning.

[0032] The original well pipe column can be used for auxiliary construction to save construction cost.

[0033] The technical solutions provided by the embodiments of the application are described in detail above, specific examples are applied in this paper to describe the principles and implementation modes of the embodiments of the application, and the above embodiment description is only applicable to help understand the principles of the embodiments of the application.

Claims

1. A reverse clamp for oil wells, comprising an outer cylinder, said outer cylinder including a fixed outer cylinder (1), a travel outer cylinder (2), a guide rail outer cylinder (3), a gear guide sleeve (27), and a gear guide shaft sleeve (4), characterized in that: The fixed outer tube (1), stroke outer tube (2), guide rail outer tube (3), gear guide outer sleeve (27) and gear guide shaft sleeve (4) are sequentially screwed, the fixed outer tube (1) is provided with a lifting power shaft (5), the lower end of the lifting power shaft (5) is screwed with a self-rotation guide rail (6), the inside of the self-rotation guide rail (6) is slidably connected with a self-rotation shaft (7), the lower end of the self-rotation shaft (7) is fixedly connected with a first guide gear (8), the first guide gear (8) engages a second guide gear (9), the second guide gear (9) is sleeved on a four-groove spline (10), the four-groove spline (10) is fixedly connected with a first five-tooth gear (11), the top of the first five-tooth gear (11) engages a second five-tooth gear (12), the second five-tooth gear (12) and the second guide gear (9) are connected by a spring (13) through a groove, the gear guide shaft sleeve (4) is fixedly connected with a flat bearing (14), the first guide gear (8), the second guide gear (9), the first five-tooth gear (11) and the second five-tooth gear (12) are arranged between the flat bearing (14) and the lower end of the guide rail outer tube (3), and the bottom end of the self-rotation shaft (7) is provided with a reverse buckle shaft (15). The upper lifting power shaft (5), the reverse threaded shaft (15) and the first guide gear (8) are internally provided with water hole channels (16); the middle part of the upper lifting power shaft (5) is provided with a water outlet hole (17), the inner bottom of the upper lifting power shaft (5) is provided with a ball seat (18), the ball seat (18) is internally provided with a blocking ball (19); the fixed outer cylinder (1) is provided with eight pipe sleeve fixing columns (20), six of which are prevented from rotating in combination with the fixed outer cylinder 1 and fixing devices; the lowermost two pipe sleeve fixing columns (20) serve the function of up-down floating positioning; the pipe sleeve fixing column (20) is movably connected with the fixed outer cylinder (1) through a spring sheet (26), the spring sheet (26) is a circular sheet, the material of the spring sheet (26) is spring steel, the bottom of the spring sheet (26) is fixedly connected with a base (28), the top end of the pipe sleeve fixing column (20) is provided with anti-skid lines; the inner parts of the two ends of the guide rail outer cylinder (3) are internally provided with internal threads, the inner part of one end of the guide rail outer cylinder (3) is provided with a clamping groove (21), one end of the outer part of the self-rotation guide rail (6) is provided with a clamping block (22), the guide rail outer cylinder (3) and the self-rotation guide rail (6) are clamped through the clamping groove (21) and the clamping block (22), the two ends of the inner part of the guide rail outer cylinder (3) are provided with internal threads, the number of the clamping blocks (22) is four; the self-rotation shaft (7) is spiral stripes, the inner wall of the self-rotation guide rail (6) is provided with sliding grooves (23) matched with the self-rotation shaft (7), the guide rails of the sliding grooves (23) are five; the upper end of the stroke outer cylinder (2) is provided with an internal thread, the lower end of the stroke outer cylinder (2) is provided with an external thread, the top end of the upper lifting power shaft (5) is fixedly connected with a pipe clamp (24); the upper and lower ends of the fixed outer cylinder (1) are provided with pressurizing O-rings (25), the inner rings of the second five-tooth gear (12) and the second guide gear (9) are provided with protrusions, the second five-tooth gear (12) and the second guide gear (9) are sleeved with four-groove splines (10), the four-groove splines (10) are provided with sliding grooves matched with the protrusions.

Images