Medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage and mining pump system

Abstract

The utility model provides a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage and mining pump system, and relates to the technical field of oil exploitation. The drainage and mining pump system comprises a power system module, a steel composite pipe module, a drainage and mining pump module and a wellhead sealing and connecting module. A power hydraulic pipe of the power system module is connected with a power liquid pipe orifice in the wellhead sealing and connecting module, and the power liquid pipe orifice is connected with one end of a power pipe in the steel composite pipe module; the other end of the power pipe is connected with a power cylinder liquid supply pipe in the drainage pump module; the wellhead sealing module is arranged on the steel composite pipe module in a sleeving mode and located at the wellhead, and a gap between the wellhead and the steel composite pipe module is sealed. By means of the structure, the problems that a traditional rod type oil pumping system is abraded, broken and disengaged and the like can be solved, and therefore the reliability, stability, adaptability and working efficiency of the system are improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil mining, coalbed methane and shale gas drainage, in particular to a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system. Background Art

[0002] There are numerous types of oil and coalbed methane (CBM) extraction equipment currently on the market, which can be broadly categorized into several categories: purely mechanical systems, such as those comprised of traditional kowtow machines, tubing, sucker rods, and plunger pumps; motor-driven progressive cavity pump systems; hydraulically powered systems, including direct-acting hydraulic jet systems; systems that use surface hydraulic transmission to replace the kowtow machine to pull the sucker rods and plunger pumps; and systems that directly drive the plunger up and down. While these systems have facilitated oil and coalbed methane extraction to some extent, they each have drawbacks. For example, purely mechanical pump systems are poorly adaptable to inclined and horizontal wells. While surface hydraulically driven pumps have replaced traditional kowtow machines, similar issues still exist in their underground components. Hydraulic direct-acting jet systems suffer from poor adaptability to depths and high energy consumption. Traditional hydraulic underground transmission pumps are limited by the material of the transmission pipeline and the hydraulic power transmission method, limiting their application in deep wells and high-temperature conditions.

[0003] Given this, there is significant room for improvement in the oil and gas extraction sector, including adapting to complex oil and gas well production and drainage conditions, improving drainage efficiency, reducing production costs, and extending service life. Especially for specialized well conditions like inclined and horizontal wells, effectively improving drainage efficiency, reducing energy consumption, and ensuring system stability and reliability are pressing challenges. Furthermore, leveraging existing, proven technologies to further optimize the design of drainage pump systems to meet the demands of greater depths and higher temperatures is also a key area of research. Utility Model Content

[0004] The main technical problem to be solved by the utility model is to provide a drainage pump system with wide adaptability, high drainage efficiency and strong stability.

[0005] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0006] The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system includes: power system module, steel composite pipe module, drainage pump module and wellhead sealing module;

[0007] The power hydraulic pipe of the power system module is connected to the power fluid pipe port in the wellhead sealing module, and the power fluid pipe port is connected to one end of the power pipe in the steel composite pipe module;

[0008] The other end of the power tube is connected to the liquid supply tube in the drainage pump module;

[0009] The wellhead sealing module is connected to the steel composite pipe module and is located at the wellhead, sealing the wellhead and carrying the steel composite pipe module and the drainage pump module.

[0010] Optionally, there are multiple steel composite pipe modules;

[0011] A plurality of the steel composite pipe modules are connected in sequence.

[0012] Optionally, the steel composite pipe module includes an outer pipe, two power pipes and a second connecting block;

[0013] The two power pipes are arranged inside the outer pipe, and a production fluid channel is left between the two power pipes and the outer pipe;

[0014] The outer tube and one end of the power tube are provided with the second connecting block;

[0015] In two adjacent steel composite pipe modules, the other end of the outer pipe in the first steel composite pipe module is connected to the second connecting block in the second steel composite pipe module.

[0016] Optionally, it further includes a first connecting block and a third connecting block;

[0017] The first connecting block is provided inside one end of the outer tube, and the third connecting block is provided at the other end thereof, for fixing the power tube.

[0018] Optionally, the power system module includes a hydraulic pump, a reversing valve and a linear reciprocating oil-water exchange hydraulic cylinder;

[0019] The output end of the hydraulic pump is connected to the input end of the reversing valve; the output end of the reversing valve is connected to the linear reciprocating oil-water exchange hydraulic cylinder;

[0020] The output end of the linear reciprocating oil-water exchange hydraulic cylinder is connected to one end of the power pipe through the power hydraulic pipe.

[0021] Optionally, a negative pressure generator is further included, and the negative pressure generator is connected to the production fluid channel.

[0022] Optionally, there are two hydraulic pumps, and the two output ends of the two hydraulic pumps are respectively connected to the two input ends of the reversing valve.

[0023] Optionally, the drainage pump module includes a pump barrel, a lower pump barrel valve assembly joint, an upper pump barrel valve assembly joint and a differential hydraulic cylinder;

[0024] The lower pump barrel valve assembly joint and the upper pump barrel valve assembly joint are respectively provided at both ends of the pump barrel, and the differential hydraulic cylinder is installed in the middle.

[0025] Optionally, the wellhead sealing module includes a wellhead sealing body, a wellhead steel composite pipe, a production fluid pipe port, a power fluid pipe port and a sealing member;

[0026] A through hole and a gas production port are provided in the middle of the wellhead sealing body;

[0027] The wellhead steel composite pipe passes through the through hole, one end of which is connected to the wellhead sealing body, and the other end is provided with the power fluid pipe port;

[0028] The side wall of the wellhead steel composite pipe is provided with the produced liquid pipe port;

[0029] The edge of the wellhead sealing body is tightly fitted with the wellhead;

[0030] The sealing member is arranged between the edge of the wellhead sealing body and the wellhead.

[0031] Optionally, a sealing convex edge is provided on the outer edge of the wellhead sealing body and extends along the central axis of the wellhead sealing body;

[0032] The sealing flange is buckled on the wellhead.

[0033] The technical solution provided by the utility model has the following technical effects:

[0034] 1. This structure can reduce the problems of rod wear and breakage in traditional rod pumping units, thereby improving the reliability, stability, adaptability and work efficiency of the system and extending the service life of the equipment.

[0035] 2. Through the serial use of multiple steel composite pipe modules, the system can flexibly adjust the length according to actual needs, which is suitable for oil well mining at different depths, increasing the adaptability and flexibility of the system.

[0036] 3. The design of the inner and outer tubes forms a production fluid channel, which is conducive to the smooth flow of the liquid. At the same time, the use of the first connecting block and the second connecting block facilitates the rapid docking and disassembly between modules, thereby improving operating efficiency.

[0037] 4. The third connecting block can better fix the power tube, preventing the power tube from being deformed or damaged due to excessive pipe length or excessive pressure, thereby ensuring the stable operation of the system.

[0038] 5. The specific composition of the power system module. This design can provide stable and powerful power support to ensure that the drainage pump can work efficiently. At the same time, the design of the linear reciprocating oil-water exchange hydraulic cylinder converts the hydraulic oil medium power fluid into water medium power fluid. The water medium power fluid drives the drainage pump to reciprocate, thereby reducing the power fluid oil medium loss and lowering the operating cost.

[0039] 6. Using a negative pressure generator can reduce the system working pressure, thereby increasing the pumping depth.

[0040] 7. By configuring dual hydraulic pumps, with one working and one backup design, when one pump fails, the other pump can be switched to continue working, thus enhancing the reliability of the system.

[0041] 8. The use of hydraulic balance adjuster ensures the stability of closed operation of hydrodynamic fluid.

[0042] 9. The closed operation design of the hydrodynamic fluid greatly reduces the working pressure of the hydraulic system, thereby achieving energy saving and consumption reduction.

[0043] 10. The internal structure of the drainage pump module, the upper and lower pump barrels, two plungers and one connecting rod are separated by a connecting rod sealing joint, and the design of the valve assembly joint at both ends realizes the two-way drainage of the drainage pump and improves work efficiency.

[0044] 11. The wellhead sealing module plays the dual role of sealing the wellhead and connecting the steel composite pipeline. The reserved output fluid port, gas port, and power fluid port ensure the integrity of the system.

[0045] 12. The design of the sealing convex edge strengthens the tightness between the wellhead sealing body and the wellhead, further improves the sealing performance of the system and reduces the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and other features and advantages of the present invention will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0047] Figure 1 This is a structural diagram of a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model;

[0048] Figure 2 This is a schematic structural diagram of a power system module in a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model;

[0049] Figure 3 This is a schematic structural diagram of a steel composite pipe module in a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model;

[0050] Figure 4 yes Figure 3 Left view of;

[0051] Figure 5 yes Figure 3 Right view of;

[0052] Figure 6 This is a schematic structural diagram of a drainage pump module in a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model;

[0053] Figure 7 It is a structural schematic diagram of a wellhead sealing module in a medium conversion type closed hydraulic bidirectional steel pipeline rodless production pump system provided in an embodiment of the present utility model.

[0054] Description of reference numerals:

[0055] 01. Power system module, 02. Steel composite pipe module, 03. Drainage pump module, 04. Wellhead sealing module, 1. Pump barrel, 2. Plunger, 3. Connecting rod sealing joint, 4. Lower pump barrel suction spring return valve, 5. Lower pump barrel discharge spring return valve, 6. Upper pump barrel suction spring return valve, 7. Upper pump barrel discharge spring return valve, 8. Lower pump barrel valve assembly joint, 9. Upper pump barrel valve assembly joint, 10. Connecting rod, 11. Lower pump barrel discharge pipe, 12. Suction pipe of lower pump barrel, 13. Suction pipe of upper pump barrel, 14. Discharge pipe of upper pump barrel, 15. Suction port of upper pump barrel, 16. Discharge port of lower pump barrel, 17. Power pipe of lower pump barrel, 18. Power pipe of upper pump barrel, 19. Output port, 20. Lower production chamber, 21. Upper production chamber, 22. Lower power chamber, 23. Upper power chamber, 24. Pipe-pump link conversion joint, 25. Second connecting block, 26. First connecting block, 26-1, third connecting block, 27. Power pipe, 28. Outer pipe, 29. Power pipe short joint, 30. First sealing gasket, 31. Second sealing gasket, 32. Production fluid channel, 33. Wellhead sealing body, 34. Seal, 35. Gas outlet, 36-1. Sealing flange, 36. Wellhead steel composite pipe, 37. Production fluid outlet, 38. Power fluid outlet, 38-1. Cylinder, 39. Hydraulic pump, 40. Filter, 41. Hydraulic oil tank, 42. Power water tank, 4 3. Hydraulic pump distribution box, 44. Remote power control box, 45. Stop valve, 46. Hydraulic gauge, 47. Reversing valve, 48. Hydraulic balance adjuster, 49. Slave power cylinder chamber, 50. Main power cylinder chamber, 51. Piston, 52. Piston connecting rod sealing joint, 53. Piston connecting rod, 54. One-way valve, 55. Main power hydraulic pipe, 56. Slave power hydraulic pipe, 57. Negative pressure generator, 58. Output fluid output pipe, 59. Output fluid collection tank. DETAILED DESCRIPTION

[0056] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0057] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0058] Figure 1 This is a structural diagram of a medium conversion type liquid closed pressure bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model; Figure 2 This is a schematic structural diagram of a power system module in a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model;

[0059] Figure 3 This is a schematic structural diagram of a steel composite pipe module in a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model; Figure 4 yes Figure 3 Left view of; Figure 5 yes Figure 3 Right view of; Figure 6 This is a schematic structural diagram of a drainage pump module in a medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system provided in an embodiment of the present utility model; Figure 7 This is a schematic diagram of the wellhead sealing module structure in the medium conversion closed hydraulic bidirectional steel pipeline rodless production pump system provided in the embodiment of the present utility model. The above diagram only illustrates the structural relationship related to the utility model and is not intended to be used as an actual scale for the actual product.

[0060] like Figures 1 to 7 As shown, the medium conversion type closed hydraulic bidirectional steel pipeline rodless production pump system in this embodiment includes: a power system module 01, a steel composite pipe module 02, a production pump module 03 and a wellhead sealing module 04; the power hydraulic pipe 56 of the power system module 01 is connected to the power fluid pipe port 38 in the wellhead sealing module 04, and the power fluid pipe port 38 is connected to one end of the power pipe 27 in the steel composite pipe module 02; the other end of the power pipe 27 is connected to the power cylinder liquid supply pipe in the production pump module 03; the wellhead sealing module 04 is sleeved on the steel composite pipe module 02 and is located at the wellhead to close the gap between the wellhead and the steel composite pipe module 02.

[0061] Power system module 01 is powered by a ground pump station and uses two liquid media, oil and water, for hydraulic conversion. The primary power fluid is oil, and the secondary power fluid is water.

[0062] The power fluid is transferred from the power hydraulic pipe 56 to the power fluid pipe port 38 in the wellhead sealing module 04, and then to the power pipe 27 in the steel composite pipe module 02. The steel composite pipe module 02 is composed of multiple steel composite pipes ranging in length from 1 to 10 meters, forming a continuous pipeline from the surface to the wellbore.

[0063] The power fluid in power tube 27 ultimately reaches the pump barrel power fluid pipe in drainage pump module 03. Drainage pump module 03 includes a pump barrel 1, plunger 2, connecting rod seal 3, and corresponding suction and discharge valves. Once the power fluid enters the power chamber, it drives plunger 2 to reciprocate, completing the drainage operation.

[0064] The liquid generated when the production pump module 03 is working is discharged through the lower cavity drainage port 16, rises along the production liquid channel 32 between the outer tube 28 of the steel composite pipe module 02 and the power tube 27, and is discharged through the production liquid pipe port 37 in the wellhead sealing module 04 after reaching the wellhead.

[0065] The wellhead sealing module 04 ensures that the produced gas will not leak through the seal 34, and provides an intermediate connection module between the power system module 01 and the steel composite pipe module 02.

[0066] During the production process, the negative pressure generator 57 will reduce the pressure of the output fluid on the plunger pump and the output fluid pipeline, thereby improving operating efficiency and reducing energy consumption. At the same time, the hydraulic balance adjuster 48 increases the stability of the closed hydraulic system operation. The closed hydraulic operation design reduces the working pressure of the hydraulic system and extends the life of the pump station, thereby ensuring the depth of the high-hanging pump and the stability of its operation.

[0067] Among them, the power system module includes a hydraulic pump 39, a reversing valve 47, and a linear reciprocating oil-water exchange hydraulic cylinder; the output end of the hydraulic pump 39 is connected to the input end of the reversing valve 47; the output end of the reversing valve 47 is connected to the linear reciprocating oil-water exchange hydraulic cylinder; the output end of the linear reciprocating oil-water exchange hydraulic cylinder is connected to the power fluid pipe port 38 through the main power hydraulic pipe 56.

[0068] The system also includes a negative pressure generator 57, which is connected to the output fluid port 37 via a output fluid output pipe 58. The negative pressure generator 57 is also connected to a output fluid collection tank 59, which collects and processes the output fluid discharged from the system, which may include filtering, cooling, or recycling.

[0069] As shown in the figure, the input ends of the two hydraulic pumps 39 are connected to the hydraulic oil tank 41 through pipelines, and a filter 40 is provided on the pipelines.

[0070] The output ends of the two hydraulic pumps 39 are connected to the input end of the reversing valve 47 through a pipeline, and a one-way valve 54, a stop valve 45 and a hydraulic gauge 46 are provided on the pipeline.

[0071] The remote power control box 44 is electrically connected to the hydraulic pump dispatch box 43 , and the hydraulic pump dispatch box 43 is connected to the hydraulic pump 39 to centrally manage the distribution of the oil output by the two hydraulic pumps 39 .

[0072] The output end of the reversing valve 47 is connected to a linear reciprocating oil-water exchange hydraulic cylinder.

[0073] The linear reciprocating oil-water exchange hydraulic cylinder includes a cylinder barrel 38-1, a cylinder connecting rod 53, two pistons 51, and a piston-connecting rod sealing section 52. A main power cylinder chamber 50 is formed between the piston 51 and the piston-connecting rod sealing section 52, and a secondary power cylinder chamber 49 is formed between the cylinder barrel 38-1 and the piston 51.

[0074] The two output ends of the reversing valve 47 are connected to the two main power cylinder chambers 50 through two main power hydraulic pipes 55 respectively.

[0075] The two slave power cylinder chambers 49 are connected to the two power pipes 27 in the wellhead steel composite pipe module through two slave power hydraulic pipes 56 respectively.

[0076] The two slave power cylinder chambers 49 are also respectively connected to a hydraulic balance adjuster 48, which is connected to the power water tank 42 through a pipeline for adjusting the pressure balance in the system to ensure that all components can operate smoothly.

[0077] In the power system module 01, the process of converting power oil into power water (dual power conversion process) mainly involves the hydraulic pump 39 liquid conversion power system. The process can be described as follows:

[0078] First, the hydraulic pump 43 in the ground pump station works by pumping hydraulic oil (as the main power fluid medium) from the hydraulic oil tank 41. The hydraulic pump 39 converts mechanical energy into hydraulic energy to generate high-pressure hydraulic oil.

[0079] Before the hydraulic oil is delivered to the hydraulic pump 39 , it first passes through a filter 40 to remove any impurities that may be present, ensuring that the oil entering the system is clean and reducing wear on system components.

[0080] The high-pressure hydraulic oil will then be sent to the reversing valve 47, the function of which is to control the direction and flow path of the hydraulic oil so that it can drive the subsequent linear reciprocating oil-water exchange hydraulic cylinder in a predetermined manner.

[0081] After passing through the reversing valve 47 , the hydraulic oil drives the plunger 51 in the linear reciprocating oil-water exchange hydraulic cylinder to move back and forth.

[0082] The reciprocating motion of plunger 51 compresses the water in power cylinder chamber 49, forcing water from power water tank 42 into the system, replacing the existing hydraulic oil as the new motive force. This process may involve pressure regulation, flow control, and other technical measures to ensure a smooth transition and maintain appropriate operating parameters.

[0083] Finally, the converted power water is transported to the underground drainage pump module through the power hydraulic pipe 56 and the steel composite pipeline, directly driving the plunger 2 to move up and down, completing the drainage operation.

[0084] In addition, there are multiple steel composite pipe modules 02, which are connected in sequence. Each steel composite pipe module 02 includes an outer pipe 28, two power pipes 27, a first connecting block 26, a third connecting block 26-1, and a second connecting block 25.

[0085] The two power pipes 27 are arranged in the outer pipe 28, and a production fluid channel 32 is left between the outer pipe 28; one end of the outer pipe 28 and the two power pipes 27 is connected with a first connecting block 26, and the other end is provided with a third connecting block 26-1 and connected; in two adjacent steel composite pipe modules 02, the other end of the outer pipe 28 in the first steel composite pipe module 02 is connected to the second connecting block 25 in the second steel composite pipe module 02.

[0086] The outer tube 28 is designed to wrap around the two power tubes 27, and a production fluid channel 32 is formed between the two. This means that the outer tube 28 not only provides physical protection for the power tubes 27, but also defines a space for the flow of production fluid, so that the production fluid can smoothly rise from the underground to the ground through this channel. A second connecting block 25 is provided at one end of the outer tube 28, which allows multiple steel composite pipe modules to be connected through the connecting blocks to form a continuous transmission line. Specifically, when multiple steel composite pipe modules are used in series, the other end of the outer tube 28 of the previous module can be docked with the second connecting block 25 of the next module, thereby establishing a complete hydraulic power transmission path and production fluid return path from the underground to the ground. This design allows the number of modules to be flexibly increased or decreased according to actual needs to adapt to underground operations at different depths.

[0087] In one embodiment, a first connecting block 26 and a third connecting block 26 - 1 are further included; the first connecting block 26 is provided inside one end of the outer tube 28 and the third connecting block 26 - 1 is provided at the other end for fixing the power tube.

[0088] A production fluid channel 32 is provided in the third connection block 26-1. This design helps enhance the stability of the power pipe, preventing bending or other deformation during long-distance transmission. Simultaneously, a production fluid channel 32 is also provided in the first connection block 26, ensuring smooth flow of production fluid at all connection points.

[0089] A second sealing gasket 31 is provided on the end surface of the first connecting block 26 .

[0090] In addition, the wellhead sealing module includes a wellhead sealing body 33, a wellhead steel composite pipe 36, a production fluid pipe port 37, two power fluid pipe ports 38 and a seal 34; a through hole is provided in the middle of the wellhead sealing body 33; one end of the wellhead steel composite pipe 36 is connected to the through hole, and the other end is provided with a power fluid pipe port 38; a production fluid pipe port 37 is provided on the side wall of the wellhead steel composite pipe 36; the edge of the wellhead sealing body 33 is tightly fitted with the wellhead; and the seal 34 is provided between the edge of the wellhead sealing body 33 and the wellhead.

[0091] A gas production port 35 should also be reserved on the wellhead sealing body 33 .

[0092] In one embodiment, a sealing flange 36 - 1 is provided on the outer edge of the wellhead sealing body 33 and extends along the central axis of the wellhead sealing body 33 ; the sealing flange 36 - 1 is buckled on the wellhead.

[0093] The wellhead seal body 33 is the foundation of the entire wellhead seal module and is typically made of high-strength material to withstand the weight and impact of downhole equipment. A through-hole is located in the center of the wellhead seal body 33, allowing the wellhead steel composite pipe 36 to pass through and establish a connection to the downhole.

[0094] One end of the wellhead steel composite pipe 36 is connected to the through-hole of the wellhead seal body 33. The other end is equipped with a power fluid port 38, which transmits the power fluid that drives the plunger downhole. In addition, a production fluid port 37 is provided on the sidewall of the wellhead steel composite pipe 36 to direct fluids such as oil, gas, or water extracted from the downhole to surface processing equipment.

[0095] The produced liquid pipe port 37 is located on the side of the wellhead steel composite pipe 36 and is responsible for guiding the liquid produced during the mining process to the storage or processing facilities on the ground.

[0096] The power fluid pipe port 38 is provided at one end of the wellhead steel composite pipe 36 to provide the required power fluid for the underground drainage pump to ensure that the pump can operate normally.

[0097] The seal 34 is installed between the edge of the wellhead sealing body 33 and the wellhead. Its function is to ensure a tight fit between the wellhead sealing body 33 and the wellhead, prevent any gas or liquid leakage, and ensure operational safety and environmental protection.

[0098] The gas production port 35 is used to collect gas resources such as natural gas. Therefore, the gas production port 35 is reserved on the wellhead sealing body 33 to effectively manage and utilize these valuable energy sources.

[0099] By tightly fitting the edge of the wellhead sealing body 33 to the wellhead and providing a seal 34 therebetween, leakage of oil, gas and other media from the wellhead can be effectively prevented, thereby ensuring the safety and environmental friendliness of the operation.

[0100] The wellhead steel composite pipe 36 not only serves as a channel for the power fluid (via the power fluid port 38), but also integrates a production fluid port 37, allowing the fluid in the production pump system to be directly transported from the wellbore to the surface. This design simplifies the wellhead connection structure, reduces the need for additional piping, and improves the system's compactness and operating efficiency.

[0101] The reserved gas production port 35 enables the gas to be collected and processed separately, avoiding potential damage to the equipment caused by the gas-liquid mixture, and also facilitates the subsequent recycling of resources such as natural gas.

[0102] In one specific embodiment, the outer edge of the wellhead seal body 33 is designed with a sealing flange 36-1 extending along the central axis of the wellhead seal body 33. This sealing flange 36-1 is designed to securely fasten to the wellhead, ensuring that the wellhead seal body 33 is securely fixed in place and providing additional sealing. This design not only improves the sealing performance at the wellhead but also enhances the overall stability of the system, ensuring safety and efficiency during the drainage process.

[0103] The drainage pump module includes a pump barrel 1, a plunger 2, a connecting rod sealing joint 3, a lower pump barrel valve assembly joint 8, a lower pump barrel valve assembly joint 9, and a connecting rod 10.

[0104] The connecting rod sealing section 3 is arranged in the pump barrel 1, dividing the pump barrel 1 into an upper pump barrel and a lower pump barrel. The upper pump barrel is connected to the lower pump barrel valve assembly section 9, and the lower pump barrel is connected to the lower pump barrel valve assembly section 8.

[0105] The connecting rod passes through the guide hole in the connecting rod sealing section 3, and a plunger 2 is provided at each end of the connecting rod, which is divided into a lower plunger and an upper plunger. A lower power chamber 22 is formed between the lower plunger and the connecting rod sealing section 3, and an upper power chamber 23 is formed between the upper plunger and the connecting rod sealing section 3.

[0106] A lower liquid collection chamber 20 is formed between the lower plunger and the lower pump barrel valve assembly joint 8, and an upper liquid collection chamber 21 is formed between the upper plunger and the upper pump barrel valve assembly joint 9.

[0107] The lower pump barrel power fluid pipe 17 is connected to the lower power chamber 22. The lower pump barrel power fluid pipe 17 is connected to a slave power hydraulic pipe 56 through a power pipe 27.

[0108] Upper pump barrel power fluid pipe 18 is connected with upper power chamber 23. Upper pump barrel power fluid pipe 18 is connected with another slave power hydraulic pipe 56 through another power pipe 27.

[0109] The lower pump barrel valve assembly section 8 includes a lower pump barrel suction spring return valve 4, a lower pump barrel suction pipe 12, an upper pump barrel suction spring return valve 6, and an upper pump barrel suction port 15. The input end of the lower pump barrel suction spring return valve 4 is connected to one end of the lower pump barrel suction pipe 12, and the input end of the upper pump barrel suction spring return valve 6 is connected to the upper pump barrel suction port 15.

[0110] The upper pump barrel valve assembly section 9 includes a lower pump barrel discharge spring return valve 5, an upper pump barrel discharge spring return valve 7, an upper pump barrel discharge pipe and a lower pump barrel discharge port 16.

[0111] The input end of the lower pump barrel discharge spring return valve 5 is connected to the output end of the lower pump barrel suction spring return valve 4 through the lower pump barrel discharge pipe 11, and the output end of the lower pump barrel discharge spring return valve 5 is connected to the lower pump barrel discharge port 16, and is connected to the output liquid port 19 and the output liquid output pipe 58.

[0112] The input end of the upper pump barrel discharge spring reset valve 7 is connected to the output end of the upper pump barrel suction spring reset valve 6 through the upper pump barrel suction pipe 13, and the output end of the upper cylinder discharge spring reset valve 7 is connected to one end of the upper pump barrel discharge pipe 14, and is connected to the output liquid port 19 and the output liquid output pipe 58.

[0113] The pipe pump link conversion section 24 is connected to the upper pump barrel valve assembly section 9.

[0114] In the embodiments of the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meanings of these terms in the embodiments of the present invention based on the specific circumstances.

[0115] In the description of the embodiments of the present invention, it is necessary to understand that the terms "upper" and "lower" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0116] Throughout this specification, terms such as "one embodiment" and "a preferred embodiment" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0117] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system, characterized by: include: Power system module, steel composite pipe module, drainage pump module and wellhead sealing module; The power hydraulic pipe of the power system module is connected to the power fluid pipe port in the wellhead sealing module, and the power fluid pipe port is connected to one end of the power pipe in the steel composite pipe module; The other end of the power tube is connected to the power cylinder liquid supply pipe in the drainage pump module; The wellhead sealing module is sleeved on the steel composite pipe module and is located at the wellhead to seal the gap between the wellhead and the steel composite pipe module.

2. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 1 is characterized in that: There are multiple steel composite pipe modules; A plurality of the steel composite pipe modules are connected in sequence.

3. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 2 is characterized in that: The steel composite pipe module includes an outer pipe, a power pipe, and a second connecting block; The power pipe is arranged inside the outer pipe, and a production fluid channel is left between the power pipe and the outer pipe; The outer tube and one end of the power tube are provided with the second connecting block; In two adjacent steel composite pipe modules, the other end of the outer pipe in the first steel composite pipe module is connected to the second connecting block in the second steel composite pipe module.

4. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 3 is characterized in that: Also includes a first connecting block and a third connecting block; The first connecting block is provided inside one end of the outer tube, and the third connecting block is provided at the other end for fixing the power tube.

5. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 1 is characterized in that: The power system module includes a hydraulic pump, a reversing valve, and a linear reciprocating hydraulic cylinder; The output end of the hydraulic pump is connected to the input end of the reversing valve; the output end of the reversing valve is connected to the linear reciprocating hydraulic cylinder; The output end of the linear reciprocating hydraulic cylinder is connected to one end of the power pipe through the power hydraulic pipe.

6. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 5 is characterized in that: It also includes a negative pressure generator, which is connected to the production fluid channel.

7. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 5 is characterized in that: There are two hydraulic pumps, and the two output ends of the two hydraulic pumps are respectively connected to the two input ends of the reversing valve.

8. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 1 is characterized in that: The drainage pump module includes a pump barrel, a lower pump barrel valve assembly joint, an upper pump barrel valve assembly joint and a differential hydraulic cylinder; The lower pump barrel valve assembly joint and the upper pump barrel valve assembly joint are respectively provided at both ends of the pump barrel, and the differential hydraulic cylinder is installed in the middle.

9. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 1 is characterized in that: The wellhead sealing module includes a wellhead sealing body, a wellhead steel composite pipe, a production fluid pipe port, a power fluid pipe port and a sealing member; A through hole and a gas production port are provided in the middle of the wellhead sealing body; One end of the wellhead steel composite pipe is connected to the through hole, and the other end is provided with the power fluid pipe port; The side wall of the wellhead steel composite pipe is provided with the produced liquid pipe port; The edge of the wellhead sealing body is tightly fitted with the wellhead; The sealing member is arranged between the edge of the wellhead sealing body and the wellhead.

10. The medium conversion type closed hydraulic bidirectional steel pipeline rodless drainage pump system according to claim 9 is characterized in that: A sealing convex edge is provided on the outer edge of the wellhead sealing body and extends along the central axis of the wellhead sealing body; The sealing flange is buckled on the wellhead.

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