Wellhead coalbed methane screw compressor

Abstract

The utility model belongs to coalbed gas mining technical field discloses a wellhead coalbed gas screw compressor, including compressor host computer, motor, gas pipeline system, oil pipeline system, cooling water circulation system and control system, the compressor host computer is used to the low pressure coalbed gas of wellhead collection carries out compression, the motor is connected with the compressor host computer through the shaft coupling, is used for driving the compressor host computer, the gas pipeline system is connected with the compressor host computer, is used for the air intake, compression, oil gas separation and gas supply of coalbed gas, the oil pipeline system is connected with the compressor host computer, is used for the circulation, cooling and filtration of lubricating oil. The utility model effectively solved the problem that the traditional screw compressor is heavy and leads to the transportation and installation difficulty, greatly facilitates the transportation and deployment of equipment in the poor road condition mountain wild wellhead area, shortens the equipment installation period, reduces the installation cost, improves the efficiency of coalbed gas mining.

Description

Technical Field

[0001] This utility model belongs to the field of coalbed methane extraction technology, specifically relating to a wellhead coalbed methane screw compressor. Background Technology

[0002] Wellhead coalbed methane screw compressors are core equipment used in coalbed methane extraction. Their main function is to pressurize the low-pressure coalbed methane collected at the wellhead to the pressure required for transportation or processing. Wellheads are generally located in mountainous areas with very poor road conditions, and the gas production of a single well is relatively small. With the development of coalbed methane extraction technology and the decline of underground coalbed methane pressure, in addition to safety and reliability, miniaturization, lightweight design, and convenient transportation are also key indicators that customers are increasingly valuing in coalbed methane screw compressors.

[0003] Traditional screw compressors are bulky and have a low degree of system integration. When the equipment is first installed or the location is changed, it is often necessary to build a new road that can be passed by trucks. On-site installation and daily maintenance are also very inconvenient. In view of this, a wellhead coalbed methane screw compressor was designed. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a wellhead coalbed methane screw compressor, which effectively solves the transportation and installation difficulties caused by the bulkiness of traditional screw compressors. It greatly facilitates the transportation and deployment of equipment in mountainous wellhead areas with poor road conditions, shortens the equipment installation cycle, reduces installation costs, and improves the efficiency of coalbed methane extraction.

[0005] The technical solution of this utility model is as follows: a wellhead coalbed methane screw compressor, comprising a compressor main unit, a motor, a gas pipeline system, an oil pipeline system, a cooling water circulation system, and a control system. The compressor main unit is used to compress low-pressure coalbed methane collected at the wellhead; the motor is connected to the compressor main unit via a coupling and is used to drive the compressor main unit; the gas pipeline system is connected to the compressor main unit and is used for coalbed methane intake, compression, oil-gas separation, and gas supply; the oil pipeline system is connected to the compressor main unit and is used for lubricating oil circulation, cooling, and filtration; the cooling water circulation system is connected to the oil pipeline system and is used to cool the lubricating oil; the control system is used to monitor and control the operating parameters of the unit.

[0006] Furthermore, the gas piping system includes:

[0007] The main unit's air intake pipe is connected to the air intake end of the compressor main unit and is used to introduce coalbed methane from the wellhead into the compressor main unit.

[0008] The main unit exhaust pipe is connected to the exhaust end of the compressor main unit and is used to discharge the compressed oil-gas mixture;

[0009] A coarse oil-gas separator, connected to the exhaust pipe of the main unit, is used for coarse separation of oil and gas;

[0010] An essential oil vapor separator is connected to the crude oil vapor separator. The essential oil vapor separator is equipped with a cohesive oil-separating filter element for further separation of oil and gas.

[0011] A gas supply pipe is connected to the refined oil gas separator. The gas supply pipe is equipped with a minimum pressure valve to transport the separated gas to the coalbed methane gathering and transportation station.

[0012] A safety valve and a safety valve vent pipe are installed on the essential oil gas separator for overpressure gas release.

[0013] Furthermore, the oil pipeline system includes:

[0014] An oil suction pipe is connected to the crude oil-gas separator and is used to draw lubricating oil from the crude oil-gas separator.

[0015] A temperature control valve, connected to the oil suction pipe, is used to regulate the flow rate of lubricating oil through the oil cooler to achieve a suitable exhaust temperature;

[0016] An oil cooler, connected to the temperature control valve via a cooler inlet pipe, is used to cool the lubricating oil.

[0017] An oil filter, connected to the oil cooler via the cooler's oil outlet pipe, is used to filter impurities in the lubricating oil;

[0018] The oil supply pipe connects the oil filter and the compressor unit to deliver filtered lubricating oil to the compressor unit.

[0019] Furthermore, the cooling water circulation system includes:

[0020] An oil-cooled water inlet pipe is connected to the water inlet end of the oil cooler and is used to introduce circulating cooling water into the oil cooler.

[0021] The oil-cooled water outlet pipe is connected to the water outlet of the oil cooler and is used to discharge the cooled water after heat exchange into the client's circulating water system.

[0022] Furthermore, the control system includes:

[0023] An intake pressure gauge is installed on the main unit's intake pipe to detect the intake pressure of the wellhead gas.

[0024] The exhaust pressure transmitter and exhaust temperature transmitter are connected to the exhaust pipe of the main unit to monitor the exhaust temperature and exhaust pressure of the screw compressor.

[0025] The gas supply pressure transmitter and the gas supply temperature transmitter are connected to the gas supply pipe to monitor the gas supply temperature and gas supply pressure.

[0026] The oil supply pressure transmitter is connected to the oil supply pipe to monitor the oil supply pressure and protect the safe and stable operation of the compressor unit.

[0027] The lubricating oil temperature transmitter and heater are connected to the crude oil-gas separator to monitor and regulate the lubricating oil temperature in winter.

[0028] Furthermore, it also includes an explosion-proof control box, which is connected to the motor, inlet pressure gauge, exhaust pressure transmitter, exhaust temperature transmitter, supply pressure transmitter, supply temperature transmitter, oil supply pressure transmitter, heater, lubricating oil temperature transmitter and air tank pressure gauge, and is used to control the normal operation of the unit.

[0029] Furthermore, the crude oil-gas separator also functions as an oil storage tank and a gas storage tank. The crude oil-gas separator is equipped with an oil filling port, a manual venting port, an oil draining port, and an inspection port for daily oil replenishment, venting, oil draining, and cleaning.

[0030] Furthermore, both sides of the bottom of the crude oil-gas separator are fixedly connected to mounting base plates, and rollers are installed on the mounting base plates for short-distance transportation or movement.

[0031] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0032] In this application, the compressor host, motor, gas pipeline system, oil pipeline system, cooling water circulation system, control system and gas storage tank are rationally arranged and highly integrated, which reduces the width and weight of the unit. This effectively solves the problem of transportation and installation difficulties caused by the bulkiness of traditional screw compressors, greatly facilitates the transportation and deployment of equipment in mountainous wellhead areas with poor road conditions, shortens the equipment installation cycle, reduces installation and maintenance costs, and improves the efficiency of coalbed methane extraction. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a three-dimensional schematic diagram of a partial structure of the present invention from a frontal perspective;

[0035] Figure 2 This is a three-dimensional schematic diagram of a partial structure of the present invention from a rear view.

[0036] Figure 3This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0037] In the attached image:

[0038] 1. Compressor main unit; 2. Main unit inlet pipe; 3. Main unit exhaust pipe; 4. Coarse oil-gas separator; 5. Motor; 6. Oil supply pipe; 7. Fine oil-gas separator; 8. Aggregate oil separator filter element; 9. Minimum pressure valve; 10. Air supply pipe; 11. Safety valve; 12. Safety valve vent pipe; 13. Oil suction pipe; 14. Temperature control valve; 15. Cooler oil inlet pipe; 16. Oil cooler; 17. Cooler oil outlet pipe; 18. Oil filter; 19. Oil-cooled water inlet pipe; 20. Oil-cooled water outlet pipe; 21. Inlet pressure gauge; 22. Exhaust pressure transmitter; 23. Exhaust temperature transmitter; 24. Air supply pressure transmitter; 25. Air supply temperature transmitter; 26. Oil supply pressure transmitter; 27. Heater; 28. Lubricating oil temperature transmitter; 29. ​​Air tank pressure gauge; 30. Explosion-proof control box; 31. Mounting base plate. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] This application is described below with reference to the accompanying drawings and specific embodiments:

[0042] Please see Figure 1-3 A wellhead coalbed methane screw compressor includes a compressor main unit 1, a motor 5, a gas pipeline system, an oil pipeline system, a cooling water circulation system, and a control system. The compressor main unit 1 is used to compress low-pressure coalbed methane collected at the wellhead. The motor 5 is connected to the compressor main unit 1 via a coupling and is used to drive the compressor main unit 1. The gas pipeline system is connected to the compressor main unit 1 and is used for coalbed methane intake, compression, oil-gas separation, and gas supply. The oil pipeline system is connected to the compressor main unit 1 and is used for lubricating oil circulation, cooling, and filtration. The cooling water circulation system is connected to the oil pipeline system and is used to cool the lubricating oil. The control system is used to monitor and control the operating parameters of the unit.

[0043] The gas pipeline system includes a main unit inlet pipe 2, a main unit exhaust pipe 3, a crude oil-gas separator 4, a refined oil-gas separator 7, a gas supply pipe 10, a safety valve 11, and a safety valve vent pipe 12. The main unit inlet pipe 2 is connected to the inlet end of the compressor main unit 1 to introduce coalbed methane from the wellhead into the compressor main unit 1. The main unit exhaust pipe 3 is connected to the exhaust end of the compressor main unit 1 to discharge the compressed oil-gas mixture. The crude oil-gas separator 4 is connected to the main unit exhaust pipe 3 for coarse separation of oil and gas. The refined oil-gas separator 7 is connected to the crude oil-gas separator 4 and is equipped with a cohesive oil separator filter element 8 for further separation of oil and gas. The gas supply pipe 10 is connected to the refined oil-gas separator 7 and is equipped with a minimum pressure valve 9 to transport the separated gas to the coalbed methane gathering and transportation station. The safety valve 11 and the safety valve vent pipe 12 are installed on the refined oil-gas separator 7 for overpressure relief of gas.

[0044] The coalbed methane at the wellhead enters the compressor host 1 through the main unit inlet pipe 2. The compressor host 1 is connected to the motor 5 through a coupling. After the motor 5 starts, it rotates and drives the coupling and the compressor host 1 to rotate, compressing the gas entering the compressor host 1. The gas is then mixed with the lubricating oil injected into the compressor host 1 through the oil supply pipe 6. After compression, the oil-gas mixture enters the coarse oil-gas separator 4 through the main unit exhaust pipe 3 for coarse separation of oil and gas. Most of the oil droplets settle to the bottom in the coarse oil-gas separator 4.

[0045] Some of the gas containing a small amount of oil mist enters the refined oil gas separator 7. After passing through the aggregated oil separator filter element 8 in the refined oil gas separator 7, the small amount of oil mist is aggregated and separated and settles into the coarse oil gas separator 4. At this time, the oil and gas are basically completely separated. The separated gas is sent to the coalbed methane gathering and transportation station through the minimum pressure valve 9 and the gas supply pipe 10.

[0046] Meanwhile, the essential oil gas separator 7 is also equipped with a safety valve 11 to prevent the gas in the crude oil gas separator 4 from being overpressurized. When the safety valve 11 is activated, the released gas is discharged into the venting network of the client through the safety valve vent pipe 12.

[0047] The oil pipeline system includes an oil suction pipe 13, a temperature control valve 14, an oil cooler 16, an oil filter 18, and an oil supply pipe 6. The oil suction pipe 13 is connected to the coarse oil-gas separator 4 and is used to draw lubricating oil from the coarse oil-gas separator 4. The temperature control valve 14 is connected to the oil suction pipe 13 and is used to regulate the flow direction and flow rate of the lubricating oil. The oil cooler 16 is connected to the temperature control valve 14 through the cooler inlet pipe 15 and is used to cool the lubricating oil. The oil filter 18 is connected to the oil cooler 16 through the cooler outlet pipe 17 and is used to filter impurities in the lubricating oil. The oil supply pipe 6 is connected between the oil filter 18 and the compressor main unit 1 and is used to deliver the filtered lubricating oil to the compressor main unit 1.

[0048] After the oil and gas are completely separated in the coarse oil-gas separator 4 and the fine oil-gas separator 7, the oil settles to the bottom and, under the action of pressure difference, enters the temperature control valve 14 through the oil suction pipe 13. A portion of the hot oil enters the oil cooler 16 through the cooler inlet pipe 15, where it exchanges heat with the cooling water flowing into the oil cooler 16. Then, it mixes with the lubricating oil bypassing the temperature control valve 14 through the cooler outlet pipe 17 and enters the oil filter 18. The oil filter 18 filters out impurities from the lubricating oil, and the clean lubricating oil enters the compressor main unit 1 through the oil supply pipe 6 to mix with the gas and begin the next cycle. The function of the temperature control valve 14 is to regulate the ratio of lubricating oil entering the oil cooler 16 and the bypass oil directly entering the oil filter 18 to ensure that the screw compressor has a suitable discharge temperature.

[0049] The cooling water circulation system includes an oil-cooled inlet pipe 19 and an oil-cooled outlet pipe 20. The oil-cooled inlet pipe 19 is connected to the inlet end of the oil cooler 16 and is used to introduce circulating cooling water into the oil cooler 16. The oil-cooled outlet pipe 20 is connected to the outlet end of the oil cooler 16 and is used to discharge the heat-exchanged cooling water into the circulating water system of the client.

[0050] The circulating cooling water enters the oil cooler 16 through the oil cooler inlet pipe 19, exchanges heat with the hot lubricating oil, and then returns to the circulating water system of the client through the oil cooler outlet pipe 20. Its main function is to cool the lubricating oil and ensure the normal operation of the screw compressor.

[0051] The control system includes an intake pressure gauge 21, an exhaust pressure transmitter 22, a supply air pressure transmitter 24, a supply air temperature transmitter 25, a supply oil pressure transmitter 26, a lubricating oil temperature transmitter 28, and a heater 27.

[0052] The intake pressure gauge 21 is installed on the main unit's intake pipe 2. The intake pressure gauge 21 is mainly used to detect the intake pressure of the wellhead gas, which is used to determine whether there is sufficient coalbed methane in the well during inspection. The exhaust pressure transmitter 22 and the exhaust temperature transmitter 23 are installed on the main unit's exhaust pipe 3. They are used to monitor the exhaust temperature and exhaust pressure of the screw compressor to prevent overpressure and overtemperature during operation.

[0053] Gas supply pressure transmitter 24 and gas supply temperature transmitter 25 are installed on gas supply pipe 10 to monitor gas supply temperature and pressure, ensuring that the gas pressure and temperature supplied to customers meet the requirements of the coalbed methane gathering and transportation station. Oil supply pressure transmitter 26 is installed on oil supply pipe 6 to monitor oil supply pressure, preventing oil shortage in the compressor main unit 1 during unit operation.

[0054] The lubricating oil temperature transmitter 28 and heater 27 are installed on the crude oil-gas separator 4 to monitor and regulate the temperature of the lubricating oil in winter. If the lubricating oil temperature is too low in winter, the oil's fluidity will be reduced, so the heater 27 needs to be turned on to heat the lubricating oil to ensure that the unit can operate normally.

[0055] A pressure gauge 29 for the gas storage tank is installed on the side of the crude oil-gas separator 4 to detect the pressure inside the gas storage tank.

[0056] The wellhead coalbed methane screw compressor also includes an explosion-proof control box 30, which is connected to a motor 5, an inlet pressure gauge 21, an exhaust pressure transmitter 22, an exhaust temperature transmitter 23, a supply pressure transmitter 24, a supply temperature transmitter 25, a supply oil pressure transmitter 26, a heater 27, a lubricating oil temperature transmitter 28, and a gas storage tank pressure gauge 29. The normal operation of the unit is controlled by a PLC control system in the explosion-proof control box 30.

[0057] The crude oil-gas separator 4 serves as both an oil storage tank and a gas storage tank. It is equipped with an oil filling port, a manual venting port, an oil draining port, and an inspection port for daily oil replenishment, venting, oil draining, and cleaning.

[0058] Both sides of the bottom of the crude oil-gas separator 4 are fixedly connected to the mounting base plate 31. Rollers can be installed on the mounting base plate 31, which enables the screw compressor to be moved conveniently over short distances, further improving the flexibility of use. When it is necessary to adjust the position of the screw compressor or to make short-distance relocation, there is no need for complicated handling equipment and a large amount of manpower, which reduces the difficulty and cost of movement and better adapts to the changing working environment requirements of the wellhead coalbed methane extraction site.

[0059] This screw compressor features a compact design, simple piping, stable center of gravity, and high degree of integration. It reduces the width and weight of the unit while maintaining full functionality.

[0060] This screw compressor can be used not only for wellhead coalbed methane screw compressors, but also for other small process gas screw compressors such as biogas screw compressors.

[0061] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wellhead coalbed methane screw compressor, characterized in that, include: The compressor main unit (1) is used to compress the low-pressure coalbed methane collected at the wellhead; The motor (5) is connected to the compressor host (1) via a coupling and is used to drive the compressor host (1). The gas pipeline system is connected to the compressor host (1) and is used for coalbed methane intake, compression, oil-gas separation and gas supply; The oil pipeline system is connected to the compressor host (1) and is used for the circulation, cooling and filtration of lubricating oil; A cooling water circulation system, connected to the oil pipeline system, is used to cool the lubricating oil; The control system is used to monitor and control the operating parameters of the unit.

2. The wellhead coalbed methane screw compressor as described in claim 1, characterized in that, The gas pipeline system includes: The main unit air inlet pipe (2) is connected to the air inlet end of the compressor main unit (1) and is used to introduce coalbed methane from the wellhead into the compressor main unit (1). The main unit exhaust pipe (3) is connected to the exhaust end of the compressor main unit (1) and is used to discharge the compressed oil-gas mixture; A crude oil-gas separator (4) is connected to the exhaust pipe (3) of the main unit and is used for crude separation of oil and gas; An essential oil gas separator (7) is connected to the crude oil gas separator (4). The essential oil gas separator (7) is equipped with a cohesive oil separation filter element (8) for further separation of oil and gas. Gas supply pipe (10) is connected to the refined oil gas separator (7). The gas supply pipe (10) is equipped with a minimum pressure valve (9) for transporting the separated gas to the coalbed methane gathering and transportation station. Safety valve (11) and safety valve vent pipe (12) are installed on the essential oil gas separator (7) for gas overpressure relief.

3. The wellhead coalbed methane screw compressor as described in claim 2, characterized in that, The oil pipeline system includes: The oil suction pipe (13) is connected to the crude oil-gas separator (4) and is used to draw lubricating oil from the crude oil-gas separator (4); The temperature control valve (14) is connected to the oil suction pipe (13) and is used to adjust the flow rate of lubricating oil through the oil cooler (16) to achieve a suitable exhaust temperature; An oil cooler (16) is connected to the temperature control valve (14) via a cooler inlet pipe (15) and is used to cool the lubricating oil. An oil filter (18) is connected to the oil cooler (16) via the cooler outlet pipe (17) and is used to filter impurities in the lubricating oil. The oil supply pipe (6) is connected between the oil filter (18) and the compressor host (1) to deliver the filtered lubricating oil to the compressor host (1).

4. The wellhead coalbed methane screw compressor as described in claim 3, characterized in that, The cooling water circulation system includes: The oil cooling water inlet pipe (19) is connected to the water inlet end of the oil cooler (16) and is used to introduce circulating cooling water into the oil cooler (16). The oil-cooled water outlet pipe (20) is connected to the water outlet of the oil cooler (16) and is used to discharge the cooled water after heat exchange into the circulating water system of the client.

5. The wellhead coalbed methane screw compressor as described in claim 4, characterized in that, The control system includes: An air pressure gauge (21) is installed on the main unit's air intake pipe (2) to detect the air intake pressure at the wellhead. The exhaust pressure transmitter (22) and the exhaust temperature transmitter (23) are connected to the exhaust pipe (3) of the main unit and are used to monitor the exhaust temperature and exhaust pressure of the screw compressor. A gas supply pressure transmitter (24) and a gas supply temperature transmitter (25) are connected to the gas supply pipe (10) to monitor the gas supply temperature and gas supply pressure. The oil supply pressure transmitter (26) is connected to the oil supply pipe (6) to monitor the oil supply pressure and protect the safe and stable operation of the compressor host (1); A lubricating oil temperature transmitter (28) and a heater (27) are connected to a crude oil-gas separator (4) for monitoring and regulating the temperature of the lubricating oil in winter.

6. The wellhead coalbed methane screw compressor as described in claim 5, characterized in that, It also includes an explosion-proof control box (30), which is connected to a motor (5), an inlet pressure gauge (21), an exhaust pressure transmitter (22), an exhaust temperature transmitter (23), a supply pressure transmitter (24), a supply temperature transmitter (25), an oil supply pressure transmitter (26), a heater (27), a lubricating oil temperature transmitter (28), and a gas tank pressure gauge (29) to control the normal operation of the unit.

7. The wellhead coalbed methane screw compressor as described in claim 6, characterized in that, The crude oil-gas separator (4) serves as both an oil storage tank and a gas storage tank. The crude oil-gas separator (4) is equipped with an oil filling port, a manual venting port, an oil draining port, and an inspection port for daily oil replenishment, venting, oil draining, and cleaning.

8. The wellhead coalbed methane screw compressor as described in claim 7, characterized in that, The crude oil-gas separator (4) has mounting base plates (31) fixedly connected to both sides of its bottom. Rollers can be installed on the mounting base plates (31) for short-distance transportation or movement.

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