Skid-mounted integrated scattered gas treatment and recovery device

Abstract

The utility model relates to the technical field of treatment and recovery of scattered natural gas in oil and gas fields, in particular to a skid-mounted integrated scattered gas treatment and recovery device, which comprises a buffer separator, a high-efficiency separator, a high-pressure recovery device, a low-pressure recovery device and a gas filling column. The device is reasonable and compact in structure and convenient to use, a first safety valve is fixedly arranged on the first gas conveying pipeline, an outlet of the first safety valve is fixedly communicated with a first emptying pipeline, safety valves are arranged on the separators and the buffer tanks, and outlets of the safety valves are fixedly communicated to the first emptying pipeline; after gas well products enter the system, the products are subjected to two-phase separation through the buffer separator and the efficient separator, high-pressure recovery or low-pressure recovery is automatically selected according to the difference value between the incoming gas pressure and the filling pressure of the CNG tank car, and finally filling is conducted through the gas filling column till filling of the CNG tank car is completed. The device can be integrated to a steel skid-mounted base, is convenient to transport and small in occupied area, and meets the requirement of flexible operation.

Description

Technical Field

[0001] The utility model relates to the technical field of treatment and recovery of scattered natural gas in oil and gas fields, and is a skid-mounted integrated scattered gas treatment and recovery device. Background Technique

[0002] Under the background of the increasing demand for natural gas resources, the development intensity of natural gas resources has been continuously increased. However, the following problems have gradually emerged during the development process: there are some remote exploration wells, which are limited by geographical factors and production uncertainty and cannot establish a pipeline transportation system, and cannot be trial-produced and produced in time, affecting the development process; there are some scattered gas wells with relatively low production, which are often unable to meet the requirements of establishing a pipeline transportation system due to economy, and can only be shut in for treatment.

[0003] Carrying out scattered gas recovery operations can effectively solve the above problems. However, the currently applied scattered natural gas recovery systems generally adopt the form of modular skid-mounted assembly, with high system input costs and large on-site commissioning operations, and still cannot meet the economic and flexibility requirements of such wells.

[0004] At present, the domestic market for scattered gas recovery systems has begun to develop towards skid-mounted, but the degree of integration is relatively low, mostly composed of multiple single-function modules, such as dehydration skids, compressor skids, filling skids, etc., which are assembled on-site at the operation site, with low automation, cumbersome operation, large commissioning operations and high costs.

[0005] The Chinese patent document with the authorization announcement number CN209839674U discloses a high-pressure natural gas collection and direct filling system with a relatively high degree of integration. The process route is to heat and separate the high-pressure wet gas from the wellhead twice to remove part of the water and heavy hydrocarbons in the natural gas, so as to meet the conditions for medium-pressure tanker transportation. However, the water dew point, hydrocarbon dew point and components of the treated natural gas do not meet the requirements of GB-17820 and cannot be sold as commercial gas, and still need to be secondary-treated. In addition, the filling pressure of the medium-pressure tanker is only 6MPa, and the transportation efficiency and economy are relatively low. Summary of the Invention

[0006] The utility model provides a skid-mounted integrated scattered gas treatment and recovery device, which overcomes the above-mentioned deficiencies of the prior art, and can effectively solve the problems of the existing scattered natural gas treatment and recovery device in oil and gas fields, such as a large number of equipment modules, low transportation efficiency, high cost, large commissioning operations and cumbersome operation.

[0007] The technical solution of the utility model is realized by the following measures: A skid-mounted integrated scattered gas treatment and recovery device, including a buffer separator, a high-efficiency separator, a high-pressure recovery device, a low-pressure recovery device, and a gas filling column. The middle inlet of the buffer separator is fixedly connected to the wellhead gas pipeline. There is a first gas pipeline fixedly connected between the top outlet of the buffer separator and the middle inlet of the high-efficiency separator. There is a second gas pipeline fixedly connected between the top outlet of the high-efficiency separator and the inlet of the high-pressure recovery device. There is a sixth gas pipeline fixedly connected between the outlet of the high-pressure recovery device and the gas filling column. There is a seventh gas pipeline fixedly connected between the inlet of the second gas pipeline 1 and the inlet of the low-pressure recovery device. There is a twelfth gas pipeline fixedly connected between the outlet of the low-pressure recovery device and the outlet of the second gas pipeline between the seventh gas pipeline and the high-pressure recovery device.

[0008] The following is a further optimization and / or improvement of the above-mentioned technical solution of the utility model:

[0009] The above-mentioned high-pressure recovery device includes a pre-filter, an oil removal filter, a molecular sieve, and a post-filter. There is a second gas pipeline fixedly connected between the top outlet of the high-efficiency separator and the inlet of the pre-filter. There is a third gas pipeline fixedly connected between the first outlet of the pre-filter and the inlet of the oil removal filter. There is a fourth gas pipeline fixedly connected between the first outlet of the oil removal filter and the upper inlet of the molecular sieve. There is a fifth gas pipeline fixedly connected between the bottom outlet of the molecular sieve and the inlet of the post-filter.

[0010] The above-mentioned low-pressure recovery device includes a first-stage compressor, an air cooler, a second-stage compressor, a first-stage separation filter, and a second-stage separation filter. There is a seventh gas pipeline fixedly connected between the inlet of the second gas pipeline and the inlet of the first-stage compressor. There is an eighth gas pipeline fixedly connected between the outlet of the first-stage compressor and the upper inlet of the air cooler. There is a ninth gas pipeline fixedly connected between the upper outlet of the air cooler and the inlet of the first-stage separation filter. There is a thirteenth gas pipeline fixedly connected between the outlet of the first-stage separation filter and the inlet of the second-stage compressor. There is a tenth gas pipeline fixedly connected between the outlet of the second-stage compressor and the lower inlet of the air cooler. There is an eleventh gas pipeline fixedly connected between the lower outlet of the air cooler and the upper inlet of the second-stage separation filter.

[0011] The above also includes a buffer tank and a flare system. There is a second gas pipeline fixedly connected to the sixth gas pipeline. The outlet of the second gas pipeline is fixedly connected to the buffer tank. The top outlet of the buffer tank is fixedly connected to a third gas pipeline. There is a first gas pipeline fixedly connected to the second gas pipeline between the inlet of the second gas pipeline and the seventh gas pipeline. The outlet of the first gas pipeline is fixedly connected to the flare system. There is a tank truck gas supply pipeline fixedly connected to the second gas pipeline between the seventh gas pipeline and the twelfth gas pipeline.

[0012] A first safety valve is fixedly arranged on the above-mentioned first gas pipeline, the outlet of the first safety valve is fixedly connected to a first vent pipeline, a second vent pipeline is fixedly connected between the second gas pipeline between the high-efficiency separator and the first gas pipeline and the first vent pipeline, a second safety valve is fixedly arranged on the eighth gas pipeline, a third safety valve is fixedly arranged on the upper part of the first-stage separation filter, a fourth safety valve is fixedly arranged on the upper part of the second-stage separation filter, a fifth safety valve is fixedly arranged on the upper part of the molecular sieve, a sixth safety valve is fixedly arranged on the upper part of the buffer tank, and the outlets of the second safety valve, the third safety valve, the fourth safety valve, the fifth safety valve, and the sixth safety valve are respectively fixedly connected to the first vent pipeline.

[0013] A first blowdown pipeline is fixedly connected to the bottom outlet of the above-mentioned buffer separator, a second blowdown pipeline is fixedly connected between the bottom outlet of the high-efficiency separator and the first blowdown pipeline, a fourth blowdown pipeline is fixedly connected between the bottom outlet of the second-stage separation filter and the first blowdown pipeline between the second blowdown pipeline and the outlet of the first blowdown pipeline, a third blowdown pipeline is fixedly connected between the bottom outlet of the first-stage separation filter and the fourth blowdown pipeline, a fifth blowdown pipeline is fixedly connected between the second outlet of the pre-filter and the first blowdown pipeline between the fourth blowdown pipeline and the outlet of the first blowdown pipeline, a sixth blowdown pipeline is fixedly connected between the second outlet of the oil removal filter and the fifth blowdown pipeline, a seventh blowdown pipeline is fixedly connected between the second outlet of the post-filter and the first blowdown pipeline between the outlet of the fifth blowdown pipeline and the outlet of the first blowdown pipeline, and an eighth blowdown pipeline is fixedly connected between the bottom outlet of the buffer tank and the first blowdown pipeline between the outlet of the seventh blowdown pipeline and the outlet of the first blowdown pipeline.

[0014] A first pressure regulating valve is fixedly arranged on the above-mentioned second vent pipeline, a second pressure regulating valve is fixedly arranged on the second gas pipeline between the twelfth gas pipeline and the tanker gas supply pipeline, a third pressure regulating valve is fixedly arranged on the seventh gas pipeline, and a remote flowmeter, a fourth pressure regulating valve, and a remote switch valve are fixedly arranged in sequence according to the medium flow direction on the sixth gas pipeline between the second gas pipeline and the gas filling column.

[0015] A first liquid level regulating valve is fixedly arranged on the first blowdown pipeline between the buffer separator and the second blowdown pipeline, a second liquid level regulating valve is fixedly arranged on the second blowdown pipeline, a third liquid level regulating valve is fixedly arranged on the third blowdown pipeline, a fourth liquid level regulating valve is fixedly arranged on the fourth blowdown pipeline between the second-stage separation filter and the third blowdown pipeline, a fifth liquid level regulating valve is fixedly arranged on the fifth blowdown pipeline between the pre-filter and the sixth blowdown pipeline, and a sixth liquid level regulating valve is fixedly arranged on the sixth blowdown pipeline.

[0016] A first manual valve is fixedly arranged on the above-mentioned first gas pipeline, a second manual valve is fixedly arranged on the tanker gas supply pipeline, a third manual valve is fixedly arranged on the second gas pipeline, a fourth manual valve is fixedly arranged on the third gas pipeline, a fifth manual valve is fixedly arranged on the eighth sewage discharge pipeline, and a sixth manual valve is fixedly arranged on the seventh sewage discharge pipeline.

[0017] The above also includes a PLC controller. The first pressure regulating valve, the second pressure regulating valve, the third pressure regulating valve, the fourth pressure regulating valve, the remote switch valve, the first liquid level regulating valve, the second liquid level regulating valve, the third liquid level regulating valve, the fourth liquid level regulating valve, the fifth liquid level regulating valve, the sixth liquid level regulating valve, and the remote transmission flowmeter are all electrically connected to the PLC controller.

[0018] The structure of the utility model is reasonable and compact, and it is convenient to use. According to the difference between the incoming gas pressure and the CNG tanker filling pressure, it automatically selects to carry out high-pressure recovery or low-pressure recovery, and finally fills through the gas filling column until the CNG tanker is filled. The utility model realizes the separation, dehydration, pressurization, metering and filling of natural gas with multiple functional modules of a single skid, and the inlet pressure is 3MPa to 16MPa, with a wide application range, so as to achieve the purpose of efficiently and economically recovering natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Appendix Figure 1 is a schematic process flow diagram of the utility model.

[0020] Appendix Figure 1The encodings in it are as follows: 1 is a buffer separator, 2 is an efficient separator, 3 is a pre-filter, 4 is an oil removal filter, 5 is a molecular sieve, 6 is a post-filter, 7 is a gas filling column, 8 is a first-stage compressor, 9 is an air cooler, 10 is a second-stage compressor, 11 is a second-stage separation filter, 12 is a buffer tank, 13 is a flare system, 14 is a gas pipeline from the wellhead, 15 is a first gas transmission pipeline, 16 is a second gas transmission pipeline, 17 is a third gas transmission pipeline, 18 is a fourth gas transmission pipeline, 19 is a fifth gas transmission pipeline, 20 is a sixth gas transmission pipeline, 21 is a seventh gas transmission pipeline, 22 is an eighth gas transmission pipeline, 23 is a ninth gas transmission pipeline, 24 is a first-stage separation filter, 25 is a tenth gas transmission pipeline, 26 is an eleventh gas transmission pipeline, 27 is a twelfth gas transmission pipeline, 28 is a thirteenth gas transmission pipeline, 29 is a first vent pipeline, 30 is a second vent pipeline, 31 is a first gas phase pipeline, 32 is a second gas phase pipeline, 33 is a third gas phase pipeline, 34 is a gas supply pipeline for tank trucks, 35 is a first sewage discharge pipeline, 36 is a second sewage discharge pipeline, 37 is a third sewage discharge pipeline, 38 is a fourth sewage discharge pipeline, 39 is a fifth sewage discharge pipeline, 40 is a sixth sewage discharge pipeline, 41 is a seventh sewage discharge pipeline, 42 is an eighth sewage discharge pipeline, 43 is a first pressure regulating valve, 44 is a second pressure regulating valve, 45 is a third pressure regulating valve, 46 is a fourth pressure regulating valve, 47 is a remote switch valve, 48 is a first liquid level regulating valve, 49 is a second liquid level regulating valve, 50 is a third liquid level regulating valve, 51 is a fourth liquid level regulating valve, 52 is a fifth liquid level regulating valve, 53 is a sixth liquid level regulating valve, 54 is a first manual valve, 55 is a second manual valve, 56 is a third manual valve, 57 is a fourth manual valve, 58 is a fifth manual valve, 59 is a remote transmission flowmeter, 60 is a sixth manual valve, 61 is a first safety valve, 62 is a second safety valve, 63 is a third safety valve, 64 is a fourth safety valve, 65 is a fifth safety valve, 66 is a sixth safety valve. Detailed implementation manners

[0021] The present utility model is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solution of the present utility model and the actual situation.

[0022] In the present utility model, unless otherwise specified, the equipment and devices used are all the existing well-known and commonly used equipment and devices in the art.

[0023] In the present utility model, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the attached Figure 1 drawings of the specification. For example, the position relationships such as front, back, up, down, left, and right are determined according to the layout direction of the attached Figure 1 drawings of the specification.

[0024] The present utility model will be further described below in conjunction with the embodiments and the drawings:

[0025] Example 1: As shown in the Figure 1 accompanying drawings, the skid-mounted integrated scattered gas treatment and recovery device includes a buffer separator 1, a high-efficiency separator 2, a high-pressure recovery device, a low-pressure recovery device, and a gas filling column 7. The middle inlet of the buffer separator 1 is fixedly connected to the wellhead gas pipeline 14. There is a fixedly connected first gas pipeline 15 between the top outlet of the buffer separator 1 and the middle inlet of the high-efficiency separator 2. There is a fixedly connected second gas pipeline 16 between the top outlet of the high-efficiency separator 2 and the inlet of the high-pressure recovery device. There is a fixedly connected sixth gas pipeline 20 between the outlet of the high-pressure recovery device and the gas filling column 7. There is a fixedly connected seventh gas pipeline 21 between the inlet of the second gas pipeline 16 and the inlet of the low-pressure recovery device. There is a fixedly connected twelfth gas pipeline 27 between the outlet of the low-pressure recovery device and the outlet of the second gas pipeline 16 between the seventh gas pipeline 21 and the high-pressure recovery device.

[0026] The device of the present utility model is designed with high integration and can be integrated into a 3m×12m steel skid-mounted base, which is convenient for transportation and has a small floor area, meeting the requirements of flexible operation. It is applicable to natural gas wells with wellhead pressure from 3MPa to 16MPa, gas volume less than 10×10 4 Nm 3 , liquid volume less than 10m 3 / d, the sum of C1 to C3 in the natural gas components accounts for more than 90%, and the natural gas well without H2S. A single skid can process natural gas into qualified finished CNG and fill it. If the wellhead pressure is relatively high, a throttling and pressure reduction system and a heating system can be equipped at the front end of the device; if the daily liquid production of a single well is relatively high, a large-volume high-efficiency separator 2 can be configured separately.

[0027] After the gas well output enters the system, it first passes through the buffer separator 1 and the high-efficiency separator 2 for two-phase separation of the output. When the initial incoming gas pressure is higher than the CNG truck filling pressure, it directly passes through the high-pressure recovery device and is filled by the gas filling column 7. As the filling progresses, if the incoming gas pressure is lower than the CNG truck filling pressure, it is switched from the rear end of the high-efficiency separator 2 to the low-pressure recovery device to pressurize the gas phase, and then the above process flow is repeated until the CNG truck is filled.

[0028] According to actual needs, the above skid-mounted integrated scattered gas treatment and recovery device can be further optimized or / and improved:

[0029] Example 2: The difference from Example 1 is that as shown in the Figure 1As shown in the figure, the high-pressure recovery device includes a pre-filter 3, an oil removal filter 4, a molecular sieve 5, and a post-filter 6. There is a fixed connection between the top outlet of the high-efficiency separator 2 and the inlet of the pre-filter 3 through a second gas pipeline 16. There is a fixed connection between the first outlet of the pre-filter 3 and the inlet of the oil removal filter 4 through a third gas pipeline 17. There is a fixed connection between the first outlet of the oil removal filter 4 and the upper inlet of the molecular sieve 5 through a fourth gas pipeline 18. There is a fixed connection between the bottom outlet of the molecular sieve 5 and the inlet of the post-filter 6 through a fifth gas pipeline 19.

[0030] Embodiment 3: The difference from Embodiments 1 to 2 is that as shown in the appendix Figure 1 As shown in the figure, the low-pressure recovery device includes a first-stage compressor 8, an air cooler 9, a second-stage compressor 10, a first-stage separation filter 24, and a second-stage separation filter 11. There is a fixed connection between the inlet of the second gas pipeline 16 and the inlet of the first-stage compressor 8 through a seventh gas pipeline 21. There is a fixed connection between the outlet of the first-stage compressor 8 and the upper inlet of the air cooler 9 through an eighth gas pipeline 22. There is a fixed connection between the upper outlet of the air cooler 9 and the inlet of the first-stage separation filter 24 through a ninth gas pipeline 23. There is a fixed connection between the outlet of the first-stage separation filter 24 and the inlet of the second-stage compressor 10 through a thirteenth gas pipeline 28. There is a fixed connection between the outlet of the second-stage compressor 10 and the lower inlet of the air cooler 9 through a tenth gas pipeline 25. There is a fixed connection between the lower outlet of the air cooler 9 and the upper inlet of the second-stage separation filter 11 through an eleventh gas pipeline 26.

[0031] Embodiment 4: The difference from Embodiments 1 to 3 is that as shown in the appendix Figure 1 As shown in the figure, it further includes a buffer tank 12 and a flare system 13. There is a fixed connection of a second gas phase pipeline 32 on the sixth gas pipeline 20. The outlet of the second gas phase pipeline 32 is fixedly connected to the buffer tank 12. The top outlet of the buffer tank 12 is fixedly connected to a third gas phase pipeline 33. There is a fixed connection of a first gas phase pipeline 31 on the second gas pipeline 16 between the inlet of the second gas pipeline 16 and the seventh gas pipeline 21. The outlet of the first gas phase pipeline 31 is fixedly connected to the flare system 13. There is a fixed connection of a tank truck gas supply pipeline 34 on the second gas pipeline 16 between the seventh gas pipeline 21 and the twelfth gas pipeline 27.

[0032] As needed, a second blowdown pipeline 30 and a first gas phase pipeline 31 are connected after the high-efficiency separator 2 for gas blowdown ignition when adjusting production parameters in the initial stage of well opening; the inlet of the tank truck gas supply pipeline 34 is connected to a gas supply tank truck, and a dedicated gas supply port for a gas generator is reserved on the third gas phase pipeline 33 to facilitate system heating and pressure regulation during the first well opening.

[0033] Embodiment 5: The difference from Embodiments 1 to 4 is that as shown in the appendix Figure 1As shown in the figure, a first safety valve 61 is fixedly arranged on the first gas pipeline 15. The outlet of the first safety valve 61 is fixedly communicated with a first vent pipeline 29. A second vent pipeline 30 is fixedly communicated between the second gas pipeline 16 between the high-efficiency separator 2 and the first gas pipeline 31 and the first vent pipeline 29. A second safety valve 62 is fixedly arranged on the eighth gas pipeline 22. A third safety valve 63 is fixedly arranged on the upper part of the primary separation filter 24. A fourth safety valve 64 is fixedly arranged on the upper part of the secondary separation filter 11. A fifth safety valve 65 is fixedly arranged on the upper part of the molecular sieve 5. A sixth safety valve 66 is fixedly arranged on the upper part of the buffer tank 12. The outlets of the second safety valve 62, the third safety valve 63, the fourth safety valve 64, the fifth safety valve 65, and the sixth safety valve 66 are respectively fixedly communicated to the first vent pipeline 29.

[0034] Example 6: The difference from Examples 1 to 5 is that as shown in the appendix Figure 1 As shown in the figure, the bottom outlet of the buffer separator 1 is fixedly communicated with a first sewage pipeline 35. A second sewage pipeline 36 is fixedly communicated between the bottom outlet of the high-efficiency separator 2 and the first sewage pipeline 35. A fourth sewage pipeline 38 is fixedly communicated between the bottom outlet of the secondary separation filter 11 and the first sewage pipeline 35 between the second sewage pipeline 36 and the outlet of the first sewage pipeline 35. A third sewage pipeline 37 is fixedly communicated between the bottom outlet of the primary separation filter 24 and the fourth sewage pipeline 38. A fifth sewage pipeline 39 is fixedly communicated between the second outlet of the pre-filter 3 and the first sewage pipeline 35 between the fourth sewage pipeline 38 and the outlet of the first sewage pipeline 35. A sixth sewage pipeline 40 is fixedly communicated between the second outlet of the oil removal filter 4 and the fifth sewage pipeline 39. A seventh sewage pipeline 41 is fixedly communicated between the second outlet of the post-filter 6 and the first sewage pipeline 35 between the outlet of the fifth sewage pipeline 39 and the outlet of the first sewage pipeline 35. An eighth sewage pipeline 42 is fixedly communicated between the bottom outlet of the buffer tank 12 and the first sewage pipeline 35 between the outlet of the seventh sewage pipeline 41 and the outlet of the first sewage pipeline 35.

[0035] As required, both the buffer separator 1 and the high-efficiency separator 2 are provided with liquid-phase sewage pipelines, which are connected in parallel with the sewage pipelines of the pre-filter 3, the oil removal filter 4, the molecular sieve 5, the primary separation filter 24, the secondary separation filter 11, the post-filter 6, and the buffer tank 12, and converge to the sewage main pipe for recovering the liquid phase generated during the treatment process.

[0036] Example 7: The difference from Examples 1 to 6 is that as shown in the appendix Figure 1As shown, a first pressure regulating valve 43 is fixedly arranged on the second vent pipeline 30, a second pressure regulating valve 44 is fixedly arranged on the second gas pipeline 16 between the twelfth gas pipeline 27 and the tanker gas supply pipeline 34, and a third pressure regulating valve 45 is fixedly arranged on the seventh gas pipeline 21. A remote flowmeter 59, a fourth pressure regulating valve 46, and a remote on-off valve 47 are fixedly arranged in sequence on the sixth gas pipeline 20 between the second gas pipeline 32 and the gas filling column 7 according to the medium flow direction.

[0037] As required, the first pressure regulating valve 43 is interlocked with the pressure on the high-efficiency separator 2 to prevent overpressure of the high-efficiency separator 2; the second pressure regulating valve 44 and the third pressure regulating valve 45 are respectively interlocked with the incoming gas pressure on the wellhead incoming gas pipeline 14 and the exhaust pressure on the sixth gas pipeline 20 to determine whether low-pressure recovery is carried out; the fourth pressure regulating valve 46 is interlocked with the exhaust pressure on the sixth gas pipeline 20 to prevent overpressure during filling.

[0038] Embodiment 8: The difference from Embodiments 1 to 7 is that as shown in the appendix Figure 1 As shown, a first liquid level regulating valve 48 is fixedly arranged on the first sewage pipeline 35 between the buffer separator 1 and the second sewage pipeline 36, a second liquid level regulating valve 49 is fixedly arranged on the second sewage pipeline 36, a third liquid level regulating valve 50 is fixedly arranged on the third sewage pipeline 37, a fourth liquid level regulating valve 51 is fixedly arranged on the fourth sewage pipeline 38 between the secondary separation filter 11 and the third sewage pipeline 37, a fifth liquid level regulating valve 52 is fixedly arranged on the fifth sewage pipeline 39 between the pre-filter 3 and the sixth sewage pipeline 40, and a sixth liquid level regulating valve 53 is fixedly arranged on the sixth sewage pipeline 40.

[0039] As required, the first liquid level regulating valve 48, the second liquid level regulating valve 49, the third liquid level regulating valve 50, the fourth liquid level regulating valve 51, the fifth liquid level regulating valve 52, and the sixth liquid level regulating valve 53 are respectively interlocked with the liquid levels of the buffer separator 1, the high-efficiency separator 2, the primary separation filter 24, the secondary separation filter 11, the pre-filter 3, and the oil removal filter 4 to achieve automatic liquid drainage.

[0040] Embodiment 9: The difference from Embodiments 1 to 8 is that as shown in the appendix Figure 1 As shown, a first manual valve 54 is fixedly arranged on the first gas pipeline 31, a second manual valve 55 is fixedly arranged on the tanker gas supply pipeline 34, a third manual valve 56 is fixedly arranged on the second gas pipeline 32, a fourth manual valve 57 is fixedly arranged on the third gas pipeline 33, a fifth manual valve 58 is fixedly arranged on the eighth sewage pipeline 42, and a sixth manual valve 60 is fixedly arranged on the seventh sewage pipeline 41.

[0041] As needed, the first manual valve 54, the second manual valve 55, the third manual valve 56, the fifth manual valve 58, and the sixth manual valve 60 can be manual ball valves, and the fourth manual valve 57 is a manual throttle valve, which is convenient for regulating the pressure of the gas supply to the gas generator.

[0042] Embodiment 10: The difference between it and Embodiments 1 to 9 is that as shown in the appendix Figure 1 shown, it further includes a PLC controller. The first pressure regulating valve 43, the second pressure regulating valve 44, the third pressure regulating valve 45, the fourth pressure regulating valve 46, the remote switch valve 47, the first liquid level regulating valve 48, the second liquid level regulating valve 49, the third liquid level regulating valve 50, the fourth liquid level regulating valve 51, the fifth liquid level regulating valve 52, and the sixth liquid level regulating valve 53, and the remote flowmeter 59 are all electrically connected to the PLC controller.

[0043] As needed, the model of the PLC controller can be Simatic SR1200 Smart.

[0044] Embodiment 11: For a remote and scattered gas well, there are no power facilities at the well site and no treatment or gathering and transportation stations around. The wellhead pressure is 15 MPa, the wellhead temperature is 25 °C, and the daily output is 6×10 4 Nm 3 , the liquid volume is 10 m 3 / d, and the sum of C1 to C3 in the natural gas composition accounts for 95%.

[0045] The wellhead is directly connected to the skid-mounted integrated scattered gas treatment and recovery device through the wellhead gas pipeline 14. The interface of the first sewage pipeline 35 is connected to the liquid tank, and the interface of the third gas pipeline 33 is connected to 1 gas generator for power supply; the wellhead gas-liquid mixture is separated by the buffer separator 1 and the high-efficiency separator 2. After the gas phase is pressurized by the first-stage compressor 8 and the second-stage compressor 10 and dehydrated by the molecular sieve 5, it is filled into the CNG truck by using the double-gun gas filling column 7.

[0046] As needed, on each pipeline and equipment of the skid-mounted integrated scattered gas treatment and recovery device, conventional valves, thermometers, pressure gauges, etc. well-known and commonly used in the art can also be provided according to production needs.

[0047] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effects. Non-essential technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

[0048] Usage process of the embodiment of the present utility model: First, the gas coming from the wellhead passes through the buffer separator 1 and the high-efficiency separator 2 for gas-liquid separation; then, when the gas phase pressure is higher than the filling pressure of the CNG truck, the scattered gas is recovered, separated, and dried through the high-pressure recovery device and directly filled by the gas filling column 7. When the gas phase pressure is lower than the filling pressure of the CNG truck, it first passes through the low-pressure recovery device and then through the high-pressure recovery device for scattered gas recovery, separation, and drying, and is filled by the gas filling column 7; finally, the above process is repeated until the CNG truck is filled up.

Claims

1. A skid-mounted integrated scattered gas treatment and recovery device, characterized in that It includes a buffer separator, a high-efficiency separator, a high-pressure recovery device, a low-pressure recovery device, and a gas filling column. The middle inlet of the buffer separator is fixedly connected with a wellhead gas pipeline, the top outlet of the buffer separator and the middle inlet of the high-efficiency separator are fixedly connected with a first gas pipeline, the top outlet of the high-efficiency separator and the inlet of the high-pressure recovery device are fixedly connected with a second gas pipeline, the outlet of the high-pressure recovery device and the gas filling column are fixedly connected with a sixth gas pipeline, the inlet of the second gas pipeline and the inlet of the low-pressure recovery device are fixedly connected with a seventh gas pipeline, and the outlet of the low-pressure recovery device and the outlet of the second gas pipeline between the seventh gas pipeline and the high-pressure recovery device are fixedly connected with a twelfth gas pipeline.

2. The skid-mounted integrated scattered gas treatment and recovery device according to claim 1 is characterized in that The high-pressure recovery device includes a pre-filter, an oil removal filter, a molecular sieve, and a post-filter. A second gas pipeline is fixedly connected between the top outlet of the high-efficiency separator and the inlet of the pre-filter, a third gas pipeline is fixedly connected between the first outlet of the pre-filter and the inlet of the oil removal filter, a fourth gas pipeline is fixedly connected between the first outlet of the oil removal filter and the upper inlet of the molecular sieve, and a fifth gas pipeline is fixedly connected between the bottom outlet of the molecular sieve and the inlet of the post-filter.

3. The skid-mounted integrated scattered gas treatment and recovery device according to claim 1 or 2, characterized in that The low-pressure recovery device includes a first-stage compressor, an air cooler, a second-stage compressor, a first-stage separation filter, and a second-stage separation filter. A seventh gas pipeline is fixedly connected between the inlet of the second gas pipeline and the inlet of the first-stage compressor, an eighth gas pipeline is fixedly connected between the outlet of the first-stage compressor and the upper inlet of the air cooler, a ninth gas pipeline is fixedly connected between the upper outlet of the air cooler and the inlet of the first-stage separation filter, a thirteenth gas pipeline is fixedly connected between the outlet of the first-stage separation filter and the inlet of the second-stage compressor, a tenth gas pipeline is fixedly connected between the outlet of the second-stage compressor and the lower inlet of the air cooler, and an eleventh gas pipeline is fixedly connected between the lower outlet of the air cooler and the upper inlet of the second-stage separation filter.

4. The skid-mounted integrated scattered gas treatment and recovery device according to claim 3 is characterized in that It also includes a buffer tank and a flare system. The sixth gas pipeline is fixedly connected to the second gas phase pipeline, the outlet of the second gas phase pipeline is fixedly connected to the buffer tank, the top outlet of the buffer tank is fixedly connected to the third gas phase pipeline, the second gas pipeline between the inlet of the second gas pipeline and the seventh gas pipeline is fixedly connected to the first gas phase pipeline, the outlet of the first gas phase pipeline is fixedly connected to the flare system, and the second gas pipeline between the seventh gas pipeline and the twelfth gas pipeline is fixedly connected to the tank truck gas supply pipeline.

5. The skid-mounted integrated scattered gas treatment and recovery device according to claim 4 is characterized in that A first safety valve is fixedly arranged on the first gas transmission pipeline, and the outlet of the first safety valve is fixedly connected to the first venting pipeline, a second venting pipeline is fixedly connected between the second gas transmission pipeline between the high-efficiency separator and the first gas phase pipeline and the first venting pipeline, a second safety valve is fixedly arranged on the eighth gas transmission pipeline, a third safety valve is fixedly arranged on the top of the first-level separation filter, a fourth safety valve is fixedly arranged on the top of the second-level separation filter, a fifth safety valve is fixedly arranged on the top of the molecular sieve, a sixth safety valve is fixedly arranged on the top of the buffer tank, and the outlets of the second safety valve, the third safety valve, the fourth safety valve, the fifth safety valve and the sixth safety valve are fixedly connected to the first venting pipeline respectively.

6. The skid-mounted integrated scattered gas treatment and recovery device according to claim 4 or 5, characterized in that The bottom outlet of the buffer separator is fixedly connected to the first sewage pipeline, the bottom outlet of the high-efficiency separator is fixedly connected to the first sewage pipeline, the bottom outlet of the secondary separation filter and the first sewage pipeline between the second sewage pipeline and the first sewage pipeline outlet are fixedly connected to a fourth sewage pipeline, the bottom outlet of the primary separation filter and the fourth sewage pipeline are fixedly connected to a third sewage pipeline, the second outlet of the pre-filter and the first sewage pipeline between the fourth sewage pipeline and the first sewage pipeline outlet are fixedly connected to a fifth sewage pipeline, the second outlet of the oil removal filter and the fifth sewage pipeline are fixedly connected to a sixth sewage pipeline, the second outlet of the post-filter and the fifth sewage pipeline are fixedly connected to the first sewage pipeline between the fifth sewage pipeline outlet and the first sewage pipeline outlet, and the eighth sewage pipeline is fixedly connected between the bottom outlet of the buffer tank and the first sewage pipeline between the seventh sewage pipeline outlet and the first sewage pipeline outlet.

7. The skid-mounted integrated scattered gas treatment and recovery device according to claim 6 is characterized in that A first pressure regulating valve is fixedly installed on the second vent pipeline, a second pressure regulating valve is fixedly installed on the second gas pipeline between the twelfth gas pipeline and the tank truck gas supply pipeline, a third pressure regulating valve is fixedly installed on the seventh gas pipeline, and a remote flow meter, a fourth pressure regulating valve and a remote switch valve are fixedly installed on the sixth gas pipeline between the second gas phase pipeline and the gas filling column in sequence according to the flow direction of the medium.

8. The skid-mounted integrated scattered gas treatment and recovery device according to claim 7 is characterized in that A first liquid level regulating valve is fixedly installed on the first sewage pipeline between the buffer separator and the second sewage pipeline, a second liquid level regulating valve is fixedly installed on the second sewage pipeline, a third liquid level regulating valve is fixedly installed on the third sewage pipeline, a fourth liquid level regulating valve is fixedly installed on the fourth sewage pipeline between the secondary separation filter and the third sewage pipeline, a fifth liquid level regulating valve is fixedly installed on the fifth sewage pipeline between the pre-filter and the sixth sewage pipeline, and a sixth liquid level regulating valve is fixedly installed on the sixth sewage pipeline.

9. The skid-mounted integrated scattered gas treatment and recovery device according to claim 4, 5, 7 or 8, characterized in that A first manual valve is fixedly installed on the first gas phase pipeline, a second manual valve is fixedly installed on the tank truck gas supply pipeline, a third manual valve is fixedly installed on the second gas phase pipeline, a fourth manual valve is fixedly installed on the third gas phase pipeline, a fifth manual valve is fixedly installed on the eighth sewage pipeline, and a sixth manual valve is fixedly installed on the seventh sewage pipeline.

10. The skid-mounted integrated scattered gas treatment and recovery device according to claim 9, characterized in that It also includes a PLC controller, and the first pressure regulating valve, the second pressure regulating valve, the third pressure regulating valve, the fourth pressure regulating valve, the remote switch valve, the first liquid level regulating valve, the second liquid level regulating valve, the third liquid level regulating valve, the fourth liquid level regulating valve, the fifth liquid level regulating valve, the sixth liquid level regulating valve, and the remote flow meter are all electrically connected to the PLC controller.

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