A hydraulic long-stroke sealed pumping unit

Abstract

This invention belongs to the technical field of oil extraction pumping units, and specifically relates to a hydraulic long-stroke sealed pumping unit. A hydraulic long-stroke sealed pumping unit includes a pumping unit base, an intelligent control cabinet mounted on the pumping unit base, a hydraulic station, and a sealed housing mounting platform. A sealed housing mounting seat is located on the top of the mounting platform. A high-pressure hose is connected to the center of the bottom of the mounting seat. Below the high-pressure hose, a blowout preventer and a wellhead tee are connected in sequence. A sealed housing is mounted above the mounting seat. A hydraulic winch is installed inside the sealed housing. The hydraulic station is connected to the hydraulic winch inside the sealed housing via hydraulic oil pipes, and the hydraulic winch is hydraulically controlled to drive the rope. This invention forms a sealed space by connecting the sealed housing and the wellhead via a high-pressure hose. The hydraulic drive device is installed inside the sealed housing, allowing the extracted oil and gas to directly enter the surface delivery pipeline or sealed container, completely solving the problem of oil and gas leakage.

Description

Technical Field

[0001] This invention belongs to the technical field of oil extraction pumping units, and specifically relates to a hydraulic long-stroke sealed pumping unit. Background Technology

[0002] As oil and gas field development deepens, formation pressure continues to decline, leading to the emergence of various oil and gas lifting technologies, including electric submersible pump lift, gas lift, bubble drainage, and rod lift. Among these, rod lift is the most widely used, with existing supporting equipment including various types of pumping units. However, these all face the problem of frequent wellhead packing seal failures, resulting in oil and gas leaks, environmental pollution, and safety hazards. Furthermore, these pumping units cannot meet the needs of coalbed methane, gas-bearing wells, and fluid drainage for gas production.

[0003] Using a winch drum to wind a steel wire rope instead of a polished rod or rigid sucker rod for oil extraction is a type of rod-type oil extraction machinery that has gradually emerged in recent years. There are two types: one is the "horizontal" type, such as the patent "A Low-profile, Ultra-long Stroke Intelligent Control Winch-type Lifting Oil Extraction System and Working Method" (application number: 201410184063.7) and the patent "Ultra-long Stroke Oil Extraction Device" (application number: 201420750926.8). This type consists of two main parts: a winch drum assembly, a wellhead support frame, and a guide pulley. The other type is the "vertical tower" type, such as the patent "A Winch-type Oil Extraction Device" (application number: 201410360663.4) and the patent "An Intelligent Ultra-long Stroke Pumping Unit" (application number: 201911112157.2). These "vertical tower" pumping units either have the winch drum assembly directly fixed to the wellhead frame, or the winch drum assembly moves axially on the wellhead frame. Regardless of whether it's a "horizontal" or vertical tower pumping unit, although the wellhead packing seal system has been eliminated, the problems of leakage and environmental pollution caused during oil and gas extraction remain unresolved. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a hydraulic long-stroke sealed pumping unit. This unit connects the sealed housing and the wellhead via a high-pressure hose, forming a closed space that eliminates the need for packing seals. The hydraulic drive unit is installed inside the sealed housing, allowing the extracted oil and gas to directly enter the surface delivery pipeline or sealed container, thus completely solving the oil and gas leakage problem. Because a hydraulic drive unit is used, there are no electrical components or cables inside the sealed container, eliminating safety hazards and ensuring safety during use.

[0005] The technical solution of this invention is as follows: a hydraulic long-stroke sealed pumping unit, comprising a pumping unit base, an intelligent control cabinet mounted on the pumping unit base, a hydraulic station, and a sealing shell mounting platform. The intelligent control cabinet is connected to the hydraulic station via a data cable. A sealing shell mounting seat is provided on the top of the sealing shell mounting platform. A high-pressure hose is connected to the center of the bottom of the sealing shell mounting seat. A blowout preventer and a wellhead tee are connected sequentially below the high-pressure hose. A sealing shell is mounted on the top of the sealing shell mounting seat. A hydraulic winch is provided inside the sealing shell. A drive rope is provided on the drum of the hydraulic winch. A hydraulic oil pipe installation interface is provided on the side of the sealing shell. A hydraulic oil pipe is connected to the hydraulic oil pipe through the hydraulic oil pipe. The hydraulic station is connected to the hydraulic winch inside the sealing shell through the hydraulic oil pipe. In use, the intelligent control cabinet sends a control signal to the hydraulic station, and the hydraulic station hydraulically controls the hydraulic winch to pull the drive rope.

[0006] The top of the sealing housing is provided with a safety valve interface and a pressure gauge interface, which are welded to the sealing housing.

[0007] The sealing housing mounting base is located diagonally above the sealing housing mounting platform. The bottom center of the sealing housing mounting base is on the same axis as the center of the oil wellhead. A bracket is provided between the bottom of the sealing housing mounting base and the sealing housing mounting platform.

[0008] A centralizer is provided between the high-pressure hose and the blowout preventer. The centralizer includes a centralizer housing, and a centralizer flange is provided on the upper part of the centralizer housing. Two roller support rods are fixedly connected to each other on the inner side wall of the centralizer housing. Each roller support rod is movably connected to a roller through a roller shaft. The upper end of the centralizer is bolted to the high-pressure hose through the centralizer flange, and the lower end of the centralizer is threaded to the blowout preventer through the centralizer housing.

[0009] The roller surface is provided with a roller groove, which is a semi-circular arc groove, and the radius of the semi-circular arc groove is the same as the radius of the drive rope.

[0010] The drive rope is a steel wire rope with a polyethylene coating on its surface, and the length of the drive rope is 50 to 100 meters.

[0011] A sealing gasket is provided between the sealing housing mounting base and the sealing housing, and the sealing housing mounting base and the sealing housing are fixedly connected by fastening bolts.

[0012] The sealing housing mounting base has a high-pressure hose flange at its bottom center, and the high-pressure hose is bolted to the sealing housing mounting base via the high-pressure hose flange.

[0013] The technical advantages of this invention are as follows:

[0014] 1. This invention uses steel wire rope to replace the sealing polished rod used in existing oil pumping units, which improves the service life compared to the sealing polished rod of existing oil pumping units;

[0015] 2. The sealing container of the pumping unit of the present invention is connected to the wellhead to form a closed space, which does not require packing seal. The drive device is installed in the sealing container, and the pumped oil and gas directly enter the surface delivery pipeline or the sealing container, which completely solves the problem of oil and gas leakage and is beneficial to the environmental protection of the oil production platform.

[0016] 3. The hydraulic drive device for the oil pumping unit of the present invention has no electrical components or cables inside the sealed container, and therefore poses no safety hazard.

[0017] 4. The pumping unit centralizer of the present invention is equipped with two rollers with grooves, and the drive rope is located between the two rollers. The drive rope is limited and centralized when moving up and down, preventing the drive rope from swinging and causing uneven wear with the oil pipe, thus solving the problem of uneven wear between the drive rope and the oil pipe.

[0018] 5. The oil pumping unit of this invention uses a high-pressure hose to connect the sealed container and the wellhead, which eliminates the need for strict alignment between the wellhead and the hydraulic drive device, thus facilitating rapid commissioning, installation, and use of the equipment.

[0019] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a hydraulic long-stroke sealed oil pumping unit according to an embodiment of the present invention.

[0021] Figure 2 This is a front view of the centralizer structure of a hydraulic long-stroke sealed pumping unit according to an embodiment of the present invention.

[0022] Figure 3 This is a top view of the centralizer structure of a hydraulic long-stroke sealed pumping unit according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the connection between the sealing housing mounting base and the sealing housing in an embodiment of the present invention.

[0024] Reference numerals: 1-Intelligent control cabinet, 2-Hydraulic station, 3-Hydraulic hose, 4-Sealing housing, 5-Safety valve interface, 6-Pressure gauge interface, 7-Hydraulic winch, 8-Bracket, 9-High-pressure hose, 10-Centralizer, 11-Blowout preventer, 12-Wellhead tee, 13-Sealing housing mounting platform, 14-Pumping unit base, 15-Sealing housing mounting seat, 16-Hydraulic hose mounting interface, 17-Drive rope, 18-Sealing gasket, 19-Fasting bolt, 20-High-pressure hose flange, 101-Centralizer flange, 102-Roller, 103-Roller support rod, 104-Centralizer housing, 105-Roller groove, 106-Roller shaft. Detailed Implementation

[0025] Example 1

[0026] like Figure 1 As shown, a hydraulic long-stroke sealed pumping unit includes a pumping unit base 14, an intelligent control cabinet 1, a hydraulic station 2, and a sealing shell mounting platform 13 mounted on the pumping unit base 14. The intelligent control cabinet 1 is connected to the hydraulic station 2 via a data cable. A sealing shell mounting seat 15 is provided on the top of the sealing shell mounting platform 13. A high-pressure hose 9 is connected to the center of the bottom of the sealing shell mounting seat 15. A blowout preventer 11 and a wellhead tee 12 are sequentially connected below the high-pressure hose 9. A sealing shell 4 is mounted above the sealing shell mounting seat 15. A hydraulic winch 7 is provided inside the sealing shell 4. A drive rope 17 is provided on the drum of the hydraulic winch 7. A hydraulic oil pipe installation interface 16 is provided on the side of the sealing shell 4. The hydraulic oil pipe installation interface 16 is connected to a hydraulic oil pipe 3. The hydraulic station 2 is connected to the hydraulic winch 7 inside the sealing shell 4 via the hydraulic oil pipe 3. In operation, the intelligent control cabinet 1 sends a control signal to the hydraulic station 2, and the hydraulic station 2 hydraulically controls the hydraulic winch 7 to pull the drive rope 17.

[0027] In actual use, a sealing shell 4 is installed above the sealing shell mounting base 15 of the pumping unit of the present invention. The sealing shell 4 is connected to the wellhead through a high-pressure hose 9 to form a sealed space, eliminating the need for packing seals. The drive device is installed inside the sealing shell 4, and the extracted oil and gas directly enter the surface delivery pipeline or the sealing shell 4, completely solving the problem of oil and gas leakage and benefiting the environmental protection of the oil production platform. At the same time, the pumping unit of the present invention uses a hydraulic drive device, and there are no electrical components or cables inside the sealed container, eliminating any safety hazards.

[0028] Example 2

[0029] Preferably, based on Embodiment 1, in this embodiment, the top of the sealing housing 4 is provided with a safety valve interface 5 and a pressure gauge interface 6, and the safety valve interface 5 and the pressure gauge interface 6 are welded to the sealing housing 4.

[0030] In actual use, the top of the sealing housing 4 of the present invention is provided with a safety valve interface 5 and a pressure gauge interface 6. The pressure gauge interface 6 is used to install a pressure gauge to observe the pressure inside the sealing housing 4, and the safety valve interface 5 is used to connect a safety valve to prevent safety accidents from occurring in the sealing housing 4.

[0031] Example 3

[0032] Preferably, based on embodiment 1 or 2, in this embodiment, the sealing housing mounting base 15 is located obliquely above the sealing housing mounting platform 13, the bottom center of the sealing housing mounting base 15 is on the same axis as the center of the oil wellhead, and a bracket 8 is provided between the bottom of the sealing housing mounting base 15 and the sealing housing mounting platform 13.

[0033] In actual use, the bottom center of the sealing housing mounting base 15 of the present invention is located on the same axis as the center of the oil wellhead, which makes it easy for the drive rope 17 to be on the same axis as the wellhead, facilitates the up and down movement of the drive rope 17, drives oil production, and prevents the drive rope 17 from being worn unevenly.

[0034] Example 4

[0035] Preferably, based on embodiment 1, 2, 3, or 4, such as Figure 2 , Figure 3 In this embodiment, a centralizer 10 is provided between the high-pressure hose 9 and the blowout preventer 11. The centralizer 10 includes a centralizer housing 104, and a centralizer flange 101 is provided on the upper part of the centralizer housing 104. Two roller support rods 103 are fixedly connected to each other on the inner side wall of the centralizer housing 104. Each roller support rod 103 is movably connected to a roller 102 through a roller shaft 106. The upper end of the centralizer 10 is bolted to the high-pressure hose 9 through the centralizer flange 101, and the lower end of the centralizer 10 is threaded to the blowout preventer 11 through the centralizer housing 104.

[0036] In actual use, the pumping unit centralizer of this invention is equipped with two grooved rollers 102, and the drive rope 17 is located between the two rollers 102. The drive rope 17, which moves up and down, is limited and centered to prevent it from swinging and causing uneven wear with the tubing, thus solving the problem of uneven wear between the drive rope 17 and the tubing. The upper end of the centralizer 10 is bolted to the high-pressure hose 9 through the centralizer flange 101, and the lower end of the centralizer 10 is threaded to the blowout preventer 11 through the centralizer housing 104. The high-pressure hose 9 has a maximum pressure resistance of 6.4 MPa, which can meet the pressure requirements for wellhead oil production.

[0037] Example 5

[0038] Preferably, based on embodiment 4, in this embodiment, the surface of the roller 102 is provided with a roller groove 105, the roller groove 105 is a semi-circular arc groove, and the radius of the semi-circular arc groove is the same as the radius of the drive rope 17.

[0039] In actual use, the roller groove 105 of the present invention is a semi-circular arc groove, and the radius of the semi-circular arc groove is the same as the radius of the drive rope 17, which is beneficial to straighten the drive rope 17 and prevent uneven wear between the drive rope and the oil pipe.

[0040] Example 6

[0041] Preferably, based on embodiment 1, 2, 3, 4, or 5, in this embodiment, the drive rope 17 is a steel wire rope, the surface of which is coated with a polyethylene coating, and the length of the drive rope 17 is 50 to 100 meters.

[0042] In practical use, the drive rope 17 of this invention is a steel wire rope with a polyethylene coating. The steel wire rope replaces the existing sealed polished rod used in oil pumping units, which improves the service life compared to the existing sealed polished rod. The polyethylene coating on the surface of the steel wire rope can reduce the friction of the steel wire rope movement. The length of the drive rope 17 is 50-100 meters, which can achieve an oil pumping stroke of 50-100 meters, while the maximum stroke of the existing walking beam oil pumping unit does not exceed 6 meters. Therefore, compared with the existing walking beam oil pumping unit, this invention can achieve long-stroke oil production.

[0043] Example 7

[0044] Preferably, based on embodiment 1, 2, 3, 4, 5, or 6, such as Figure 4 As shown, in this embodiment, a sealing gasket 18 is provided between the sealing housing mounting base 15 and the sealing housing 4, and the sealing housing mounting base 15 and the sealing housing 4 are fixedly connected by fastening bolts 19.

[0045] In actual use, a sealing gasket 18 is provided between the sealing housing mounting base 15 and the sealing housing 4. The sealing housing mounting base 15 and the sealing housing 4 are fixedly connected by fastening bolts 19, which ensures that the connection between the sealing housing mounting base 15 and the sealing housing 4 is tight and sealed, preventing the oil pumping unit itself from leaking crude oil.

[0046] Example 8

[0047] Preferably, based on embodiments 1, 2, 3, 4, 5, 6, or 7, in this embodiment, a high-pressure hose flange 20 is provided at the bottom center of the sealing housing mounting base 15, and the high-pressure hose 9 is bolted to the sealing housing mounting base 15 via the high-pressure hose flange 20.

[0048] In actual use, the high-pressure hose 9 and the sealing housing mounting base 15 of the present invention are bolted together through the high-pressure hose flange 20, which ensures that the high-pressure hose 9 and the sealing housing mounting base 15 are tightly connected and sealed, preventing crude oil leakage from the pipeline between the wellhead and the pumping unit.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic long-stroke sealed pumping unit, characterized in that: The system includes a pumping unit base (14), an intelligent control cabinet (1) mounted on the pumping unit base (14), a hydraulic station (2), and a sealing housing mounting platform (13). The intelligent control cabinet (1) and the hydraulic station (2) are connected via a data cable. A sealing housing mounting seat (15) is provided on the top of the sealing housing mounting platform (13). A high-pressure hose (9) is connected to the center of the bottom of the sealing housing mounting seat (15). A blowout preventer (11) and a wellhead tee (12) are connected in sequence below the high-pressure hose (9). A sealing housing (4) is installed above the sealing housing mounting seat (15). The sealed housing (4) is equipped with a hydraulic winch (7), and the hydraulic winch (7) has a drive rope (17) on its drum. The sealed housing (4) has a hydraulic oil pipe installation interface (16) on its side, and the hydraulic oil pipe installation interface (16) is connected to a hydraulic oil pipe (3). The hydraulic station (2) is connected to the hydraulic winch (7) inside the sealed housing (4) through the hydraulic oil pipe (3). When in use, the intelligent control cabinet (1) sends a control signal to the hydraulic station (2), and the hydraulic station (2) uses hydraulic control to pull the drive rope (17) to move through the hydraulic winch (7). A centralizer (10) is provided between the high-pressure hose (9) and the blowout preventer (11). The centralizer (10) includes a centralizer housing (104). A centralizer flange (101) is provided on the upper part of the centralizer housing (104). Two roller support rods (103) are fixedly connected to each other on the inner side wall of the centralizer housing (104). Each roller support rod (103) is movably connected to a roller (102) through a roller shaft (106). The upper end of the centralizer (10) is bolted to the high-pressure hose (9) through the centralizer flange (101). The lower end of the centralizer (10) is threaded to the blowout preventer (11) through the centralizer housing (104).

2. The hydraulic long-stroke sealed pumping unit according to claim 1, characterized in that: The top of the sealing housing (4) is provided with a safety valve interface (5) and a pressure gauge interface (6), which are welded to the sealing housing (4).

3. The hydraulic long-stroke sealed pumping unit according to claim 1, characterized in that: The sealing housing mounting base (15) is located diagonally above the sealing housing mounting platform (13). The bottom center of the sealing housing mounting base (15) and the center of the wellhead are on the same axis. A bracket (8) is provided between the bottom of the sealing housing mounting base (15) and the sealing housing mounting platform (13).

4. The hydraulic long-stroke sealed pumping unit according to claim 1, characterized in that: The roller (102) has a roller groove (105) on its surface. The roller groove (105) is a semi-circular arc groove, and the radius of the semi-circular arc groove is the same as the radius of the drive rope (17).

5. The hydraulic long-stroke sealed pumping unit according to claim 1, characterized in that: The drive rope (17) is a steel wire rope with a polyethylene coating on its surface, and the length of the drive rope (17) is 50 to 100 meters.

6. The hydraulic long-stroke sealed pumping unit according to claim 1, characterized in that: A sealing gasket (18) is provided between the sealing housing mounting base (15) and the sealing housing (4), and the sealing housing mounting base (15) and the sealing housing (4) are fixedly connected by fastening bolts (19).

7. The hydraulic long-stroke sealed pumping unit according to claim 1, characterized in that: The sealing housing mounting base (15) has a high-pressure hose flange (20) at the bottom center, and the high-pressure hose (9) is bolted to the sealing housing mounting base (15) through the high-pressure hose flange (20).

Images