Hydraulic lifting polish rod replacing device for rod-pumped well

Abstract

The invention belongs to the technical field of oil exploitation, and discloses a hydraulic lifting polish rod replacing device for a rod-pumped well. Comprising an electric hydraulic pump station, hydraulic pipelines, hydraulic oil cylinders, a lifting support and wedge-shaped clamps, the electric hydraulic pump station is connected with the two hydraulic oil cylinders through the two hydraulic pipelines, the lifting support is arranged at the tops of the hydraulic oil cylinders, and the wedge-shaped clamps are arranged at the bottoms of the middles of the two hydraulic oil cylinders and the center of the top of the lifting support. The problems that in the polish rod replacement process, the cost of a large vehicle is high, and the influence of weather and road conditions is large are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil extraction, and in particular relates to a hydraulic lifting and polished rod replacement device for a pumping well. Background Art

[0002] The pumping unit, sucker rod, and oil pump are commonly known as the "three pumping equipment" in oil production. The bare rod is a special solid steel rod at the top of the sucker rod. It bears the largest load in the sucker rod column. It is easily damaged due to long-term exposure to alternating loads and harsh working environment. Its service life is generally about three years. If the bare rod is still used after it is damaged, it will cause packing leakage and pollute the environment, increase the labor intensity of workers, and affect the normal production rate of oil wells. At present, domestic oil companies do not have online repair technology and can only replace it. At present, it is mainly replaced by four methods: well repair machine, crane, square clamp, and bare rod clamping device. Among them, the cost of replacing the outsourced workover rig is relatively high, about 7,000 yuan, which makes it difficult for enterprises to implement it on a large scale; the number of cranes is limited, and the demand for replacing bare rods is large, which will cause the bare rods to be replaced untimely; square clamps require employees with high technical level, and this operation method is risky and prone to safety accidents, which is not easy to promote on a large scale; when using the bare rod clamping device, the promotion of the results is limited due to the complex operation, small lifting weight, and short effective lifting height. Oil companies are in urgent need of a new technology that is portable, low-cost, simple to operate, highly safe, and has a wider range of applications to complete this work. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a hydraulic lifting device for replacing bare rods in a pumping well. The device is a portable small device with low cost and convenient transportation. It can be transported to the site by a small vehicle or manpower and can solve the problems of complex and dangerous operation, small scope of application, large acceleration of the equipment and large dynamic load. It adopts an independent hydraulic lifting system, does not require the cooperation of the pumping unit, and is simple to operate; the lifting load is large and the scope of application is wider; it runs smoothly during operation, with small acceleration and small dynamic load.

[0004] The above-mentioned purpose of the present invention is achieved through the following technical scheme: a hydraulic lifting and bare rod replacement device for a pumping well, comprising an electric hydraulic pump station, a hydraulic pipeline, a hydraulic cylinder, a lifting bracket, and a wedge-shaped clamp, wherein the electric hydraulic pump station is connected to two hydraulic cylinders through two hydraulic pipelines, a lifting bracket is provided on the top of the hydraulic cylinder, and a wedge-shaped clamp is provided at the bottom between the two hydraulic cylinders and in the center of the top of the lifting bracket.

[0005] Furthermore, the wedge-shaped fixture includes two semicircular stepped wedge-shaped cards and a wedge-shaped seat that can fit with the wedge-shaped cards.

[0006] Furthermore, a plurality of symmetrical threaded holes are provided on both sides of the lifting bracket.

[0007] Furthermore, the hydraulic cylinder includes an upper flange, a cylinder plunger, a two-way oil inlet valve, and a connecting flange. The connecting flange is located at the bottom, and a cylinder column is provided on the connecting flange. The cylinder column is equipped with a cylinder plunger, and an upper flange is provided on the cylinder plunger. Two upper and lower two-way oil inlet valves are provided on the side of the cylinder column.

[0008] Furthermore, the electric hydraulic pump station of the hydraulic lifting and bare rod replacement device for the oil pumping well is connected to two hydraulic cylinders through two hydraulic pipelines, one of which is connected to the two hydraulic cylinders through the upper two-way oil inlet valves on the two hydraulic cylinder sides, and the other is connected to the two hydraulic cylinders through the lower two-way oil inlet valves on the two hydraulic cylinder sides. The upper flange on the top of the hydraulic cylinder is connected to the lifting bracket, and wedge-shaped clamps are provided at the bottom between the two hydraulic cylinders and the center of the top of the lifting bracket. The two wedge-shaped clamps are passed through the bare rods, and the lower connecting flange is connected to the flange on the oil production tree.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: it solves the problem that the process of replacing the bare rod requires large vehicles with high costs and is greatly affected by weather and road conditions. The small equipment used in the present invention has the advantages of low cost and convenient transportation, and can be transported to the site by small vehicles or manpower; the present invention also solves the problems of complex and dangerous operation, small scope of application, large acceleration and dynamic load of the equipment, and adopts an independent hydraulic lifting system, which does not require the cooperation of the oil pump and is simple to operate; the lifting load is large and the scope of application is wider; the operation process runs smoothly, the acceleration is small, and the dynamic load is small; the device of the present invention can replace large equipment such as well repair machines and cranes, and has the advantages of low cost and portability; the device of the present invention can replace the bare rod clamping device, and does not need to repeatedly start and stop the oil pump, and has the advantages of simple operation, smooth lifting and small dynamic load; the device of the present invention can replace the operation of square clips, and has the advantages of low labor intensity, remote control and higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0011] Figure 1 It is a structural schematic diagram of a hydraulic lifting and polished rod replacement device for a pumping well of the present invention;

[0012] Figure 2 It is a front view and a top view of a lifting bracket of a hydraulic lifting and polished rod replacement device for a pumping well of the present invention;

[0013] Figure 3 It is a cross-sectional view and a top view of the hydraulic cylinder of the hydraulic lifting and polished rod replacement device for the oil pumping well of the present invention;

[0014] Figure 4 It is a split diagram of the wedge-shaped fixture of the hydraulic lifting and bare rod replacement device for the oil pumping well of the present invention.

[0015] In the figure, 1. Electric hydraulic pump station; 2. Hydraulic pipeline; 3. Hydraulic cylinder; 4. Lifting bracket; 5. Wedge clamp; 6. Upper flange; 7. Cylinder plunger; 8. Two-way oil inlet valve; 9. Connecting flange; 10. Bare rod; 11. Christmas tree upper flange; 12. Wedge card; 13. Wedge seat; 14. Cylinder column. DETAILED DESCRIPTION

[0016] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0017] Example 1

[0018] A device for replacing a bare rod by hydraulic lifting in a pumping well comprises an electric hydraulic pump station 1, a hydraulic pipeline 2, a hydraulic cylinder 3, a lifting bracket 4, and a wedge-shaped fixture 5; the wedge-shaped fixture 5 comprises two semicircular terrace-shaped wedge-shaped cards 12 and a wedge-shaped seat 13 that can fit with the wedge-shaped card 12; a plurality of symmetrical threaded holes are arranged on both sides of the lifting bracket 4; the hydraulic cylinder 3 comprises an upper flange 6, a cylinder plunger 7, a two-way oil inlet valve 8, and a connecting flange 9, the connecting flange 9 is located at the bottom, a cylinder column 14 is arranged on the connecting flange 9, a cylinder plunger 7 is installed on the cylinder column 14, an upper flange 6 is arranged on the cylinder plunger 7, and a side of the cylinder column 14 is provided with a There are two upper and lower two-way oil inlet valves 8; the electric hydraulic pump station 1 of the hydraulic lifting and replacing rod device for the pumping well is connected to two hydraulic cylinders 3 through two hydraulic pipelines 2, one of which is connected to the two hydraulic cylinders 3 through the upper two-way oil inlet valves 8 on the sides of the two hydraulic cylinders 3, and the other hydraulic pipeline 2 is connected to the two hydraulic cylinders 3 through the lower two-way oil inlet valves 8 on the sides of the two hydraulic cylinders 3. The upper flange 6 on the top of the hydraulic cylinder 3 is connected to the lifting bracket 4. A wedge-shaped fixture 5 is provided at the bottom between the two hydraulic cylinders 3 and the center of the top of the lifting bracket 4. The two wedge fixtures 5 are penetrated with a rod 10, and the connecting flange 9 is connected to the upper flange 11 of the oil production tree.

[0019] The connecting flange 9 at the bottom of the hydraulic cylinder 3 is bolted to the flange 11 on the Christmas tree, so that it stands upright on the Christmas tree. The upper flange 6 at the top of the hydraulic cylinder 3 is bolted to the lifting bracket 4. The two-way oil inlet valve 8 of the hydraulic cylinder 3 is connected to the hydraulic pump station through the hydraulic pipeline 2. The wedge-shaped card 12 and the wedge-shaped seat 13 form a lower mechanical fixture, which is mounted on the polished rod 10 on the upper plane of the oil pipe hanging; another set of wedge-shaped cards 12 and wedge-shaped seats 13 form an upper mechanical fixture, which is mounted on the polished rod 10 on the upper plane of the lifting bracket 4. The electric hydraulic pump station 1 controls the lifting and lowering of the cylinder plunger 7. When the cylinder plunger 7 is lifted, the upper mechanical fixture locks the polished rod 10 under the combined action of friction and wedge structure, and the polished rod 10 is lifted together with the cylinder plunger 7; when the cylinder plunger 7 is lowered, the lower mechanical fixture locks the polished rod 10 under the combined action of friction and wedge structure, and the cylinder plunger 7 continues to descend, and the upper fixture is unlocked. The hydraulic cylinder 3 cooperates with the wedge-shaped fixture 5 to realize the lifting and lowering of the polished rod 10 , thereby achieving the purpose of replacing the polished rod 10 .

[0020] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A hydraulic lifting and polished rod replacement device for a pumping well, characterized in that: The invention comprises an electric hydraulic pump station (1), a hydraulic pipeline (2), a hydraulic cylinder (3), a lifting bracket (4), and a wedge-shaped fixture (5), wherein the electric hydraulic pump station (1) is connected to two hydraulic cylinders (3) via two hydraulic pipelines (2), a lifting bracket (4) is arranged on the top of the hydraulic cylinder (3), and a wedge-shaped fixture (5) is arranged at the bottom between the two hydraulic cylinders (3) and at the center of the top of the lifting bracket (4).

2. The hydraulic lifting and polished rod replacement device for a pumping well according to claim 1 is characterized in that: The wedge-shaped fixture (5) comprises two semicircular terrace-shaped wedge-shaped cards (12) and a wedge-shaped seat (13) that can fit with the wedge-shaped cards (12).

3. The hydraulic lifting and polished rod replacement device for a pumping well according to claim 1 is characterized in that: The lifting bracket (4) is provided with a plurality of symmetrical threaded holes on both sides.

4. The hydraulic lifting and polished rod replacement device for a pumping well according to claim 1 is characterized in that: The hydraulic cylinder (3) comprises an upper flange (6), a cylinder plunger (7), a two-way oil inlet valve (8), and a connecting flange (9). The connecting flange (9) is located at the bottom. A cylinder column (14) is arranged on the connecting flange (9). The cylinder plunger (7) is installed on the cylinder column (14). The upper flange (6) is arranged on the cylinder plunger (7). Two upper and lower two-way oil inlet valves (8) are arranged on the side of the cylinder column (14).

5. The hydraulic lifting and polished rod replacement device for a pumping well according to claim 1 is characterized in that: The electric hydraulic pump station (1) of the hydraulic lifting and bare rod replacement device for a pumping well is connected to two hydraulic cylinders (3) through two hydraulic pipelines (2), wherein one hydraulic pipeline (2) is connected to the two hydraulic cylinders (3) through two-way oil inlet valves (8) at the upper part of the two hydraulic cylinders (3), and the other hydraulic pipeline (2) is connected to the two hydraulic cylinders (3) through two-way oil inlet valves (8) at the lower part of the two hydraulic cylinders (3). The upper flange (6) of the hydraulic cylinder (3) is connected to the lifting bracket (4), and a wedge-shaped fixture (5) is provided at the bottom between the two hydraulic cylinders (3) and the center of the top of the lifting bracket (4). The two wedge-shaped fixtures (5) are penetrated with bare rods (10), and the connecting flange (9) is connected to the upper flange (11) of the oil production tree.

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