Independent island type oilfield associated gas recovery device

Abstract

The utility model discloses a single island type oilfield associated gas recovery device. The dry gas power generation system comprises a gas inlet unit, a compression conveying unit connected with a gas phase pipeline of the gas inlet unit, a pressurization condensation unit connected with a gas phase pipeline of the compression conveying unit, and a dry gas power generation unit connected with a gas phase pipeline of the pressurization condensation unit, and the urgent discharge emptying unit is connected with the gas inlet unit, the compression conveying unit and the dry gas power generation unit through gas phase pipelines. Based on the structure and the construction provided by the utility model, the combination of pressurized condensation recovery and compression conveying can be realized, the conveying distance is long through compression under-pressure conveying, and the device is safe and reliable.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield oil and gas recovery technology, specifically relating to an associated gas recovery device for oilfields. Background Technology

[0002] Associated gas in oil fields refers to natural gas extracted simultaneously with oil during the oil extraction process. Its main component is methane, containing small amounts of light hydrocarbons, heavy hydrocarbons, hydrogen sulfide, and other components. Traditional methods for treating associated gas mostly involve combustion, which is not only wasteful of resources and energy-intensive, but also prone to environmental pollution.

[0003] With social progress and technological development, the question of how to adopt effective recycling and utilization processes to efficiently separate associated gas from oilfields into dry gas and condensate, and then convert it into high-value-added products such as liquefied natural gas, liquefied petroleum gas, and power generation, is urgently needed. This would significantly improve resource utilization and create considerable economic benefits, while also substantially reducing carbon emissions and promoting green and low-carbon development. Furthermore, effectively utilizing associated gas would reduce dependence on other energy sources and promote the sustainable use of resources. These issues are of great significance for protecting the global ecological environment and achieving long-term sustainable development.

[0004] Therefore, seeking a better and superior associated gas recovery device and technology for oil fields to solve the above problems or optimize existing technologies is particularly urgent and important. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a dokushima-type associated gas recovery device for oil fields.

[0006] Technical solution: This utility model provides a unique island-type associated gas recovery device for oilfields, which includes an intake unit, a compression and conveying unit connected to the gas phase pipeline of the intake unit, a pressurization and condensation unit connected to the gas phase pipeline of the compression and conveying unit, a dry gas power generation unit connected to the gas phase pipeline of the pressurization and condensation unit, and a rapid venting unit connected to the gas phase pipelines of the intake unit, the compression and conveying unit, and the dry gas power generation unit.

[0007] Preferably, the air intake unit includes an air intake flow meter and an air intake flame arrester connected to the air intake flow meter outlet.

[0008] The device connects the oilfield associated gas inlet to the inlet of the gas flow meter; a gas pressure transmitter is installed on the pipeline connecting the oilfield associated gas inlet to the inlet of the gas flow meter; and an oxygen content detector is installed on the pipeline connecting the outlet of the gas flame arrester to the compression and delivery unit.

[0009] Preferably, the gas phase pipeline of the compression and delivery unit includes an inlet filter, a loading valve connected to the outlet end of the inlet filter, a gas compressor connected to the outlet end of the loading valve, a first oil-gas separator connected to the outlet end of the gas compressor, an oil-gas check valve connected to the first outlet end of the first oil-gas separator, a reflux shut-off valve connected to the second outlet end of the first oil-gas separator, and an air-cooled heat exchanger connected to the outlet end of the oil-gas check valve.

[0010] The other end of the reflux shut-off valve is connected to the inlet end of the loading valve.

[0011] Preferably, the outlet end of the air-cooled heat exchanger is connected to the hot-side gas inlet of the air-cooled recovery heat exchanger in the pressurized condensing unit; the inlet end of the air intake filter is connected to the outlet of the air intake flame arrester in the air intake unit.

[0012] More preferably, an oil temperature transmitter is installed on the pipeline connecting the outlet of the gas compressor and the inlet of the first oil-gas separator. More preferably, an air-cooled temperature transmitter and an outlet pressure transmitter are installed on the outlet pipeline of the air-cooled heat exchanger. More preferably, a liquid level transmitter is installed in the liquid storage section at the bottom of the first oil-gas separator.

[0013] Preferably, the oil phase pipeline of the compression and delivery unit includes a first oil-gas separator, an oil-cooled heat exchanger connected to the oil outlet of the first oil-gas separator, an oil filter connected to the outlet of the oil-cooled heat exchanger, and an oil shut-off valve connected to the outlet of the oil filter; the other end of the oil shut-off valve is connected to the oil return port of the gas compressor.

[0014] Preferably, the pressurized condensing unit includes an air-cooled recovery heat exchanger, an inlet shut-off valve A connected to the hot-side gas outlet of the air-cooled recovery heat exchanger and located on side branch A, a dewatering heat exchanger A connected to the outlet of the inlet shut-off valve A, a pressurized condensing oil-separating heat exchanger A connected to the outlet of the dewatering heat exchanger A, an outlet shut-off valve A connected to the outlet of the pressurized condensing oil-separating heat exchanger A, an inlet shut-off valve B connected to the hot-side gas outlet of the air-cooled recovery heat exchanger and located on side branch B, a dewatering heat exchanger B connected to the outlet of the inlet shut-off valve B, a pressurized condensing oil-separating heat exchanger B connected to the outlet of the dewatering heat exchanger B, and an outlet shut-off valve B connected to the outlet of the pressurized condensing oil-separating heat exchanger B.

[0015] The pressurized condensation unit also includes a second oil-gas separator; the outlet end of the gas shut-off valve A and the outlet end of the gas shut-off valve B are both connected to the inlet end of the second oil-gas separator; the outlet end of the second oil-gas separator is connected to the cold side gas inlet of the gas-cooled recovery heat exchanger.

[0016] Preferably, the pressurized condensing unit further includes a first refrigeration compressor that provides a cold source for the water removal heat exchanger A, a second refrigeration compressor that provides a cold source for the pressurized condensing oil-separating heat exchanger A, a third refrigeration compressor that provides a cold source for the water removal heat exchanger B, a fourth refrigeration compressor that provides a cold source for the pressurized condensing oil-separating heat exchanger B, and a condensate tank.

[0017] The outlet ends of the water removal heat exchanger A, the pressurized condensing oil-separating heat exchanger A, the water removal heat exchanger B, the pressurized condensing oil-separating heat exchanger B, and the second oil-gas separator are all connected to the inlet end of the condensate tank.

[0018] Preferably, the emergency venting unit includes an intake emergency venting valve, a flame arrestor single-call valve connected to the outlet end of the intake emergency venting valve, an oil separation safety valve connected to the third outlet end of the first oil-gas separator, and an outlet emergency venting valve connected to the inlet end of the intake emergency venting valve.

[0019] The inlet end of the intake quick exhaust valve is connected to the outlet of the intake flame arrester in the intake unit.

[0020] The outlet end of the oil separator safety valve is connected to the inlet end of the flame arrestor single call valve;

[0021] The outlet end of the gas exhaust valve is connected to the inlet end of the second intermediate check valve in the dry gas power generation unit.

[0022] Preferably, the dry gas power generation unit includes a first intermediate check valve, an inlet check valve connected to the outlet end of the first intermediate check valve, an inlet associated gas generator connected to the outlet end of the inlet check valve, a self-regulating valve connected to the outlet end of the first intermediate check valve, an outlet check valve connected to the outlet end of the self-regulating valve, an outlet flame arrester connected to the outlet end of the outlet check valve, and a second intermediate check valve connected to the outlet end of the outlet exhaust valve.

[0023] The inlet of the first intermediate check valve is connected to the cold-side gas outlet of the gas-cooled recovery heat exchanger.

[0024] The other end of the second intermediate check valve is connected to the inlet end of the inlet check valve.

[0025] More preferably, the dry gas power generation unit further includes a self-controlled regulating valve connected in parallel with both ends of the self-regulating regulating valve;

[0026] The other end of the second intermediate check valve is connected to the outlet end of the first intermediate check valve, the inlet end of the inlet check valve, the inlet end of the self-operated regulating valve, and the inlet end of the automatic regulating valve; the outlet end of the self-operated regulating valve and the outlet end of the automatic regulating valve are connected to the inlet end of the exhaust check valve.

[0027] Preferably, the reflux shut-off valve is interlocked with the gas compressor.

[0028] As a preferred option, the air-cooled temperature transmitter is interlocked with the air-cooled fan.

[0029] As a preferred option, the oil temperature transmitter is interlocked with the oil cooling fan.

[0030] Preferably, both the outlet pressure transmitter and the liquid level transmitter are interlocked with the gas compressor for control.

[0031] Preferably, the oxygen content detector, the inlet pressure transmitter, and the inlet flow meter are all interlocked with the gas compressor.

[0032] Preferably, the oxygen content detector, intake pressure transmitter, and intake flow meter are all interlocked with the intake emergency exhaust valve.

[0033] Beneficial effects: The associated gas recovery device for the Dokdo-type oilfield provided by this utility model has the following advantages compared with the prior art:

[0034] (1) In the island-type associated gas recovery device for oilfields provided by this utility model, the pressurized condensation unit adopts a dual-branch channel. Based on this structure and construction, the A / B dual-branch can automatically switch to work to effectively ensure the continuity of associated gas recovery operations. When one branch / channel is working, the other branch / channel can automatically enter the defrosting process to eliminate ice blockage. In this way, the dual branches / channels can be periodically and continuously switched to ensure that the entire device / system can operate continuously for 24 hours.

[0035] (2) Based on the structure and construction provided by this utility model, the power supply required by the four refrigeration compressors, gas compressors, air-cooled fans, oil-cooled fans and other moving parts in the pressurized condensation unit, as well as the control power supply required by each valve and instrument, can all be provided by the associated gas generator, thereby realizing the island operation of the entire device / system; the entire device / system not only has efficient condensate oil recovery capability, but also can achieve self-sufficiency in island-style power generation, power supply and gas recovery without external power supply. On the one hand, it can ensure normal operation in an environment without public works support, and the power generation technology meets the requirements of harsh working conditions. On the other hand, through its own associated gas power generation function, it can not only maintain the continuous operation of the device / system itself, but also supply the surplus power to the operation of other power-consuming facilities in the surrounding area, which is green, environmentally friendly and energy-efficient.

[0036] (3) Based on the structure and construction of the island-type associated gas recovery device for oilfields provided by this utility model, multiple dimensions of rapid gas discharge can be realized, effectively avoiding overpressure, overflow, and over-oxygen content, and ensuring high safety.

[0037] (4) Based on the structure and construction of the island-type associated gas recovery device for oilfields provided by this utility model, long-distance transportation can be achieved through compressed pressurized transportation, with a transportation distance of up to several kilometers, and it is safe and reliable.

[0038] Overall, based on the structure and construction provided by this utility model, pressurized condensation recovery and compressed transportation can be combined, which can effectively overcome the resistance in the fluid transportation process, enabling oil and gas to be transported faster and over longer distances, and significantly improving the recovery efficiency of associated gas in oil fields. Moreover, based on the structure and construction provided by this utility model, the associated gas in the oil field can generate electricity through its own power supply function. On the one hand, it can be used to maintain the continuous operation of the device / system itself, achieving island-style operation, and can maintain efficient and stable operation under different load and environmental conditions. On the other hand, the surplus power can also supply the operation of other power-consuming facilities in the surrounding area. Overall, it is green, environmentally friendly, energy-saving and efficient. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of one of the associated gas recovery devices for a dokudo-type oilfield provided in this embodiment.

[0040] In the diagram, 100 is the intake unit, 200 is the compression and delivery unit, 300 is the pressurization and condensation unit, 400 is the emergency exhaust unit, and 500 is the dry gas power generation unit.

[0041] 101-Inlet flow meter, 102-Inlet flame arrester, 103-Oxygen content detector, 106-Inlet pressure transmitter;

[0042] 201-Inlet filter, 202-Loading valve, 203-Gas compressor, 204-First oil-gas separator, 205-Oil-gas check valve, 2061-Air-cooled fan, 2062-Air-cooled heat exchanger, 207-Temperature transmitter, 208-Outlet pressure transmitter, 2091-Oil-cooled fan, 2092-Oil-cooled heat exchanger, 210-Level transmitter, 211-Oil filter, 212-Oil shut-off valve, 213-Oil temperature transmitter, 214-Return shut-off valve;

[0043] 301-Air-cooled recovery heat exchanger, 3021-Water removal heat exchanger A, 3022-Water removal heat exchanger B, 3031-Pressurized condensing oil-separating heat exchanger A, 3032-Pressurized condensing oil-separating heat exchanger B, 304-Second oil-gas separator, 305-Condensate tank, 3061-Inlet shut-off valve A, 3062-Inlet shut-off valve B, 3071-Outlet shut-off valve A, 3072-Outlet shut-off valve B, 3111-First refrigeration compressor, 3121-Second refrigeration compressor, 3112-Third refrigeration compressor, 3122-Fourth refrigeration compressor;

[0044] 401-Inlet emergency exhaust valve, 402-Flame arrestor single call valve, 403-Outlet emergency exhaust valve, 404-Oil separator safety valve;

[0045] 501-Associated gas generator, 502-Inlet check valve, 503-First intermediate check valve, 504-Second intermediate check valve, 505-Outlet gas regulating valve, 506-Outlet gas flame arrester, 507-Self-operated regulating valve, 508-Outlet check valve. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The following embodiments do not constitute a limitation on the present invention.

[0047] This embodiment provides a dokushima-type associated gas recovery device for oil fields, such as... Figure 1 As shown, it includes an intake unit 100, a compression and delivery unit 200 connected to the gas phase pipeline of the intake unit 100, a pressurization and condensation unit 300 connected to the gas phase pipeline of the compression and delivery unit 200, a dry gas power generation unit 500 connected to the gas phase pipeline of the pressurization and condensation unit 300, and a rapid exhaust unit 400 connected to the gas phase pipelines of the intake unit 100, the compression and delivery unit 200, and the dry gas power generation unit 500.

[0048] Alternatively, this island-type associated gas recovery device for oilfields can be described as follows: It includes an intake unit 100, a compression and delivery unit 200 connected to the gas phase pipeline of the intake unit 100, a pressurization and condensation unit 300 connected to the gas phase pipeline of the compression and delivery unit 200, a rapid venting unit 400 connected to the gas phase pipelines of both the intake unit 100 and the compression and delivery unit 200, and a dry gas power generation unit 500 connected to the gas phase pipelines of both the pressurization and condensation unit 300 and the rapid venting unit 400. All units are interconnected via pipelines and valves, forming a complete associated gas recovery system for oilfields.

[0049] In this embodiment, specifically, the air intake unit 100 includes an air intake flow meter 101 and an air intake flame arrester 102 connected to the air outlet of the air intake flow meter 101.

[0050] The associated gas inlet of the device is connected to the inlet end of the gas flow meter 101.

[0051] In this embodiment, specifically, an intake pressure transmitter 106 is installed on the pipeline connecting the oilfield associated gas inlet to the inlet end of the intake flow meter 101; an oxygen content detector 103 is installed on the pipeline connecting the outlet of the intake flame arrester 102 to the compression and delivery unit 200.

[0052] In this embodiment, specifically, the gas phase pipeline of the compression and delivery unit 200 includes an inlet filter 201, a loading valve 202 connected to the outlet end of the inlet filter 201, a gas compressor 203 connected to the outlet end of the loading valve 202, a first oil-gas separator 204 connected to the outlet end of the gas compressor 203, an oil-gas check valve 205 connected to the first outlet end of the first oil-gas separator 204, a reflux shut-off valve 214 connected to the second outlet end of the first oil-gas separator 204, and an air-cooled heat exchanger 2062 connected to the outlet end of the oil-gas check valve 205.

[0053] The other end of the reflux shut-off valve 214 is connected to the inlet end of the loading valve 202. Alternatively, the other end of the reflux shut-off valve 214 is connected to both the inlet end of the loading valve 202 and the outlet end (i.e., the air outlet) of the intake filter 201, and gas is output from the other end of the reflux shut-off valve 214 and / or the outlet end of the intake filter 201 to the inlet end of the loading valve 202.

[0054] When the intake air volume of the gas compressor 203 is unstable, the backflow can be regulated by the backflow shut-off valve 214. That is, the backflow is regulated by opening the bypass where the backflow shut-off valve 214 is located.

[0055] In this embodiment, the outlet end of the air-cooled heat exchanger 2062 is connected to the hot-side gas inlet of the air-cooled recovery heat exchanger 301 in the pressurized condensing unit 300; the inlet end of the air intake filter 201 is connected to the outlet of the air intake flame arrester 102 in the air intake unit 100.

[0056] In some preferred embodiments, an oil temperature transmitter 213 is provided on the pipeline connecting the outlet of the gas compressor 203 and the inlet of the first oil-gas separator 204.

[0057] In some preferred embodiments, an air-cooled temperature transmitter 207 and an outlet pressure transmitter 208 are provided on the outlet pipeline of the air-cooled heat exchanger 2062.

[0058] In some preferred embodiments, a liquid level transmitter 210 is provided in the liquid storage section (also known as the liquid storage section) at the lower part of the first oil-gas separator 204.

[0059] In this embodiment, specifically, the oil phase pipeline of the compression and delivery unit 200 includes a first oil-gas separator 204, an oil-cooled heat exchanger 2092 connected to the oil outlet of the first oil-gas separator 204, an oil filter 211 connected to the outlet of the oil-cooled heat exchanger 2092, and an oil shut-off valve 212 connected to the outlet of the oil filter 211; the other end of the oil shut-off valve 212 is connected to the oil return port (also referred to as the oil phase pipeline inlet) of the gas compressor 203.

[0060] In this embodiment, specifically, the pressurized condensation unit 300 includes a gas-cooled recovery heat exchanger 301; and

[0061] The following components are connected to the hot side gas outlet of the air-cooled recovery heat exchanger 301: an inlet shut-off valve A3061 located on the A-side branch; a dewatering heat exchanger A3021 connected to the outlet of the inlet shut-off valve A3061; a pressurized condensing oil-separating heat exchanger A3031 connected to the outlet of the dewatering heat exchanger A3021; ​​and an outlet shut-off valve A3071 connected to the outlet of the pressurized condensing oil-separating heat exchanger A3031.

[0062] The following components are connected to the hot side gas outlet of the air-cooled recovery heat exchanger 301: an inlet shut-off valve B3062 located on the B side branch; a water removal heat exchanger B3022 connected to the outlet of the inlet shut-off valve B3062; a pressurized condensing oil-separating heat exchanger B3032 connected to the outlet of the water removal heat exchanger B3022; and an outlet shut-off valve B3072 connected to the outlet of the pressurized condensing oil-separating heat exchanger B3032.

[0063] In this embodiment, specifically, the pressurized condensation unit 300 further includes a second oil-gas separator 304; the outlet end of the gas shut-off valve A3071 and the outlet end of the gas shut-off valve B3072 are both connected to the inlet end of the second oil-gas separator 304.

[0064] The inlet end of the inlet shut-off valve A3061 located on the A side branch and the inlet end of the inlet shut-off valve B3062 located on the B side branch are both connected to the hot side gas outlet of the air-cooled recovery heat exchanger 301.

[0065] The outlet of the second oil-gas separator 304 is connected to the cold-side gas inlet of the gas-cooled recovery heat exchanger 301.

[0066] The cold-side gas outlet of the air-cooled recovery heat exchanger 301 is connected to the inlet of the first intermediate check valve 503.

[0067] In some preferred embodiments, the outlet ends of the gas shut-off valve A3071 and the gas shut-off valve B3072 are combined and connected to the inlet end of the second oil-gas separator 304. The outlet end of the second oil-gas separator 304 is connected to the cold side gas inlet of the gas-cooled recovery heat exchanger 301.

[0068] The inlet end of the inlet shut-off valve A3061 located on side branch A and the inlet end of the inlet shut-off valve B3062 located on side branch B are both connected to the hot side gas outlet of the gas-cooled recovery heat exchanger 301. Side branch A and side branch B are two parallel gas branches that branch off after the hot side gas outlet of the gas-cooled recovery heat exchanger 301.

[0069] The gas path A mentioned in this text can also be referred to as the A-side branch, the first branch, or the first gas path, or simply as path A or gas path A. The gas path B mentioned in this text can also be referred to as the B-side branch, the second branch, or the second gas path, or simply as path B or gas path B. The intake shut-off valve mentioned in this text can also be referred to as the intake switching valve. The exhaust shut-off valve mentioned in this text can also be referred to as the exhaust switching valve.

[0070] In this embodiment, the pressurized condensing unit 300 specifically includes a first refrigeration compressor 3111, a second refrigeration compressor 3121, a third refrigeration compressor 3112, a fourth refrigeration compressor 3122, and a condensate tank 305.

[0071] Wherein: the cold source for the water removal heat exchanger A3021 is provided by the first refrigeration compressor 3111; the cold source for the pressurized condensing oil-separating heat exchanger A3031 is provided by the second refrigeration compressor 3121; the cold source for the water removal heat exchanger B3022 is provided by the third refrigeration compressor 3112; and the cold source for the pressurized condensing oil-separating heat exchanger B3032 is provided by the fourth refrigeration compressor 3122. Alternatively, the pressurized condensing unit 300 also includes the first refrigeration compressor 3111 providing the cold source for the water removal heat exchanger A3021, the second refrigeration compressor 3121 providing the cold source for the pressurized condensing oil-separating heat exchanger A3031, the third refrigeration compressor 3112 providing the cold source for the water removal heat exchanger B3022, the fourth refrigeration compressor 3122 providing the cold source for the pressurized condensing oil-separating heat exchanger B3032, and a condensate tank 305.

[0072] The outlet ends of the water removal heat exchanger A3021, the pressurized condensing oil-separating heat exchanger A3031, the water removal heat exchanger B3022, the pressurized condensing oil-separating heat exchanger B3032, and the second oil-gas separator 304 are all connected to the inlet end of the condensate tank 305.

[0073] In this embodiment, specifically, the emergency exhaust unit 400 includes an intake emergency exhaust valve 401, an oil separator safety valve 404, and an exhaust emergency exhaust valve 403;

[0074] The inlet end (i.e., the air inlet or air intake end) of the intake quick exhaust valve 401 is connected to the outlet of the intake flame arrester 102 in the intake unit 100.

[0075] The inlet end of the oil separator safety valve 404 is connected to the third outlet end of the first oil-gas separator 204;

[0076] The inlet end of the exhaust valve 403 is connected to the outlet of the intake flame arrester 102 in the intake unit 100.

[0077] The outlet end (i.e., the air outlet end) of the intake emergency exhaust valve 401 is connected to the inlet end of the flame arrestor single call valve 402.

[0078] The outlet end of the oil separator safety valve 404 is connected to the inlet end of the flame arrestor single call valve 402;

[0079] The outlet end of the gas exhaust valve 403 is connected to the inlet end of the second intermediate check valve 504 in the dry gas power generation unit 500.

[0080] The outlet end of the flame arrestor single-call valve 402 is used for venting.

[0081] That is, the emergency exhaust unit 400 includes an intake emergency exhaust valve 401, a flame arrestor single call valve 402 connected to the exhaust end of the intake emergency exhaust valve 401, an oil separation safety valve 404 connected to the third exhaust end of the first oil-gas separator 204, and an exhaust emergency exhaust valve 403 connected to the intake end of the intake emergency exhaust valve 401.

[0082] The inlet end (i.e., the air inlet or air intake end) of the intake quick exhaust valve 401 is connected to the outlet of the intake flame arrester 102 in the intake unit 100.

[0083] Alternatively, it can be said that the outlet of the intake flame arrester 102 in the intake unit 100 is simultaneously connected to the inlet end (i.e., the air intake end) of the intake emergency exhaust valve 401 and the inlet end (i.e., the air intake end) of the exhaust emergency exhaust valve 403.

[0084] The outlet end of the oil separator safety valve 404 is connected to the inlet end of the flame arrestor single call valve 402;

[0085] The outlet end of the gas exhaust valve 403 is connected to the inlet end of the second intermediate check valve 504 in the dry gas power generation unit 500; the outlet end of the flame arrestor single call valve 402 is used for venting.

[0086] In this embodiment, as Figure 1 As shown, the dry gas power generation unit 500 includes a first intermediate check valve 503, a second intermediate check valve 504, an associated gas generator 501, and a self-regulating valve 507. Specifically, the dry gas power generation unit 500 includes a first intermediate check valve 503, an inlet check valve 502 connected to the outlet end of the first intermediate check valve 503, an inlet associated gas generator 501 connected to the outlet end of the inlet check valve 502, a self-regulating valve 507 connected to the outlet end of the first intermediate check valve 503, an outlet check valve 508 connected to the outlet end of the self-regulating valve 507, an outlet flame arrester 506 connected to the outlet end of the outlet check valve 508, and a second intermediate check valve 504 connected to the outlet end of the outlet exhaust valve 403; that is, the inlet end of the second intermediate check valve 504 is connected to the outlet end of the outlet exhaust valve 403; the other end (i.e., the outlet end) of the second intermediate check valve 504 is connected to / communicated with the inlet end of the inlet check valve 502.

[0087] The inlet of the first intermediate check valve 503 is connected to the cold side gas outlet of the air-cooled recovery heat exchanger 301.

[0088] In some preferred embodiments, the dry gas power generation unit 500 further includes a self-controlled regulating valve 505 arranged in parallel with both ends of the self-regulating regulating valve 507;

[0089] The other end (i.e., the outlet end) of the second intermediate check valve 504 is connected to / interconnected with the outlet end of the first intermediate check valve 503, the inlet end of the inlet check valve 502, the inlet end of the self-operated regulating valve 507, and the inlet end of the self-controlled regulating valve 505; the outlet ends of the self-operated regulating valve 507 and the self-controlled regulating valve 505 are connected to / interconnected with the inlet end of the exhaust check valve 508.

[0090] In this embodiment, the outlet end of the gas-outlet flame arrester 506 is used to output to external equipment, such as output to a pipeline network, output for power generation, or output to make LNG, CNG and other subsequent external devices / systems.

[0091] In some preferred embodiments, the air-cooled heat exchanger 2062 is equipped with an air-cooled fan 2061. In some preferred embodiments, the oil-cooled heat exchanger 2092 is equipped with an oil-cooled fan 2091.

[0092] In some preferred embodiments, the gas compressor 203 employs a variable frequency single screw compressor.

[0093] In some preferred embodiments, the reflux shut-off valve 214 is interlocked with the gas compressor 203.

[0094] In some preferred embodiments, the air-cooled temperature transmitter 207 is interlocked with the air-cooled fan 2061.

[0095] In some preferred embodiments, the oil temperature transmitter 213 is interlocked with the oil cooling fan 2091.

[0096] In some preferred embodiments, both the outlet pressure transmitter 208 and the level transmitter 210 are interlocked with the gas compressor 203.

[0097] In some preferred embodiments, the oxygen content detector 103, the inlet pressure transmitter 106, and the inlet flow meter 101 are all interlocked with the gas compressor 203.

[0098] In some preferred embodiments, the oxygen content detector 103, the intake pressure transmitter 106, and the intake flow meter 101 are all interlocked with the intake emergency exhaust valve 401.

[0099] Taking one of the associated gas recovery devices for a dokudo-type oilfield provided in the above embodiments as an example, its working principle / process is illustrated below:

[0100] In the intake unit 100: the pumped associated gas from the oilfield enters the compression and delivery unit 200 via the intake flow meter 101 and the intake flame arrester 102.

[0101] In the compression and delivery unit 200: the gas entering the compression and delivery unit 200 through the intake unit 100 first passes through the intake filter 201 for high-efficiency filtration and separation (to protect the gas compressor from impurities; high-efficiency filtration and separation means that the filtration level is not less than 10μm), and then passes through the loading valve 202 into the moving equipment gas compressor 203 for room temperature compression and pressurization to the first compression and pressurization threshold (e.g., 0.8MPa). The pressurized gas enters the first oil-gas separator 204 for gas and oil separation. The separated gas is discharged from the first outlet end of the first oil-gas separator 204, and is transported to the air-cooled heat exchanger 2062 for air-cooled heat exchange and cooling to room temperature before being output to the pressurized condensation unit 300.

[0102] In the pressurized condensation unit 300: the pressurized room temperature gas, after being pressurized by the compression and conveying unit 200, enters the pressurized condensation unit 300 and first enters the gas-cooled recovery heat exchanger 301 for gas-to-gas heat exchange and primary cooling (in this embodiment, gas-to-gas heat exchange and primary cooling are performed, and the temperature drops to about 15°C. The cold field temperature of the gas-cooled recovery heat exchanger 301 is 15°C).

[0103] When the A-side branch is ventilated, the gas after the first stage of cooling can enter the dewatering heat exchanger A3021 through the inlet shut-off valve A3061 for the second stage of cooling to separate free water or some heavy hydrocarbons. Then it enters the pressurized condensing oil-separating heat exchanger A3031 for the third stage of cooling to separate supersaturated water or some light hydrocarbons. Finally, it enters the second oil-gas separator 304 through the outlet shut-off valve A3071.

[0104] When the B-side branch is ventilated, the gas after the first stage of cooling can enter the dewatering heat exchanger B3022 through the inlet shut-off valve B3062 for the second stage of cooling to separate free water or some heavy hydrocarbons. Then it enters the pressurized condensing oil-separating heat exchanger B3032 for the third stage of cooling to separate supersaturated water or some light hydrocarbons. Finally, it enters the second oil-gas separator 304 through the outlet shut-off valve B3072.

[0105] In the emergency venting unit 400: when the oxygen content measured by the oxygen content detector 103 in the intake unit 100 is higher than the first preset oxygen content threshold (the first preset oxygen content threshold is adjustable, such as being set to 5%), the intake emergency venting valve 401 in the emergency venting unit 400 is opened for emergency venting (the gas is safely vented through the flame arrestor single exhalation valve 402 after passing through the intake emergency venting valve 401); when the oxygen content measured by the oxygen content detector 103 is lower than the first preset oxygen content threshold (the first preset oxygen content threshold is adjustable, such as being set to 5%), the intake emergency venting valve 401 is closed.

[0106] When the pressure value measured by the intake pressure transmitter 106 exceeds the first preset pressure threshold (the first preset pressure threshold is adjustable, such as being set to 2500Pa), the intake emergency exhaust valve 401 is opened for emergency venting (the gas is safely vented through the flame arrestor single-exit valve 402 after passing through the intake emergency exhaust valve 401); when the pressure value measured by the intake pressure transmitter 106 is less than the first preset pressure threshold (the first preset pressure threshold is adjustable, such as being set to 2500Pa), the intake emergency exhaust valve 401 is closed.

[0107] When the flow rate measured by the intake flow meter 101 exceeds the rated flow rate of the entire equipment (the rated flow rate of the entire equipment is an adjustable preset value, such as 3000m³), 3 When / d), open / start the intake emergency exhaust valve 401 for emergency venting (the gas passes through the intake emergency exhaust valve 401 and then through the flame arrestor single-exit valve 402 for safe venting); when the flow rate measured by the intake flow meter 101 is lower than the rated flow rate of the whole machine (the rated flow rate of the whole machine is an adjustable preset value, such as 3000m³), 3 When / d), close the intake exhaust valve 401;

[0108] When the pressure of the oil separator safety valve 404 in the emergency venting unit 400 exceeds its set pressure, the oil separator safety valve 404 is opened for emergency venting (the gas passes through the oil separator safety valve 404 and then through the flame arrestor single-call valve 402 for safe venting).

[0109] Among them: the oil separator safety valve 404 is used to automatically open when the associated gas pressure is too high, release pressure, and ensure the safety of the device / system; in this embodiment, the set pressure of the oil separator safety valve 404 is set to 0.96MPa, and when the pressure is over-pressurized, the excess pressure of the entire compression and conveying unit / device / system is released in time to prevent accidents from occurring;

[0110] In the dry gas power generation unit 500: the associated gas dry gas output by the second oil-gas separator 304 enters the gas cooling recovery heat exchanger 301 for cooling recovery, and then enters the dry gas power generation unit 500 in sequence through the first intermediate check valve 503 and the inlet check valve 502 to enter the associated gas generator 501 for power generation.

[0111] The associated gas mentioned in the article refers to natural gas extracted from underground oil reservoirs along with crude oil during the oil extraction process.

[0112] In this embodiment, the associated gas from the oilfield is pressurized to approximately 1500 Pa. In this example, the associated gas intake from the oilfield is typically continuous, requiring no additional gas supply, allowing the gas compressor 203 to operate continuously.

[0113] This example also includes:

[0114] Liquid collection and recovery; specifically, this includes: water or some hydrocarbon liquids separated from associated gas in the oilfield through condensation and separation in the dehydration heat exchanger A3021, the pressurized condensation oil-separation heat exchanger A3031, the dehydration heat exchanger B3022, the pressurized condensation oil-separation heat exchanger B3032, and the second oil-gas separator 304 flow into the condensate tank 305 for collection and recovery (the liquid in the condensate tank 305 can be periodically discharged to the subsequent NGL processing unit through level control. NGL is short for Natural Gas Liquids, which refers to the liquid hydrocarbon mixture obtained through separation and condensation during natural gas extraction and processing).

[0115] Air cooling start / stop; specifically including: when the temperature measured by the air cooling temperature transmitter 207 is higher than the first preset air cooling threshold (the first preset air cooling threshold is adjustable, such as being set to 40℃), the air cooling fan 2061 is turned on; when the temperature measured by the air cooling temperature transmitter 207 is lower than the second preset air cooling threshold (the second preset air cooling threshold is adjustable, such as being set to 25℃), the air cooling fan 2061 is turned off.

[0116] Oil cooling start / stop; specifically including: when the temperature measured by the oil temperature transmitter 213 is higher than the first preset oil cooling threshold (the first preset oil cooling threshold is adjustable, such as being set to 60℃), the oil cooling fan 2091 is turned on; when the temperature measured by the oil temperature transmitter 213 is lower than the second preset oil cooling threshold (the second preset oil cooling threshold is adjustable, such as being set to 50℃), the oil cooling fan 2091 is turned off.

[0117] In some preferred embodiments, this example further includes:

[0118] Interlocking alarms; specifically including:

[0119] When the pressure measured by the outlet pressure transmitter 208 is higher than the third preset pressure threshold (the third preset pressure threshold is adjustable, such as being set to 0.88MPa), an alarm will be triggered and the gas compressor 203 will be shut down.

[0120] When the liquid level measured by the level transmitter 210 is lower than the first preset liquid level threshold (the first preset liquid level threshold is adjustable, such as being set to 50mm), an alarm is triggered and the gas compressor 203 is shut down.

[0121] When the oxygen content measured by the oxygen content detector 103 is higher than the first preset oxygen content threshold (the first preset oxygen content threshold is adjustable, such as being set to 5%), the intake emergency exhaust valve 401 is opened for emergency venting (the gas is vented safely through the flame arrestor single exhalation valve 402 after passing through the intake emergency exhaust valve 401), and at the same time, an interlock alarm is triggered and the gas compressor 203 is shut down.

[0122] When the pressure value measured by the intake pressure transmitter 106 exceeds the first preset pressure threshold (the first preset pressure threshold is adjustable, such as being set to 2500Pa), the intake emergency exhaust valve 401 is opened to perform emergency venting (the gas is safely vented through the flame arrestor single call valve 402 after passing through the intake emergency exhaust valve 401), and at the same time, an interlock alarm is triggered and the gas compressor 203 is shut down.

[0123] When the flow rate measured by the intake flow meter 101 exceeds the rated flow rate of the entire equipment (the rated flow rate of the entire equipment is an adjustable preset value, such as 3000m³), 3 When / d), open / start the intake emergency exhaust valve 401 for emergency venting (the gas passes through the intake emergency exhaust valve 401 and then through the flame arrestor single call valve 402 for safe venting), and at the same time, the interlock alarm is triggered and the gas compressor 203 is shut down.

[0124] After the interlock alarm is triggered and the gas compressor 203 is shut down, the device / system can be inspected, maintained, and adjusted before restarting the entire recovery device / system as needed.

[0125] In this example, during the pressurized condensation described above:

[0126] The associated gas dry gas output from the second oil-gas separator 304 enters the gas-cooled recovery heat exchanger 301 for cold energy recovery, and then passes through the first intermediate check valve 503 and the inlet check valve 502 in sequence to enter the associated gas generator 501 for power generation; thus completing the system process of associated gas from intake, compression and transportation, pressurization and condensation, and dry gas power generation.

[0127] The cold source for the water removal heat exchanger A3021 is provided by the first refrigeration compressor 3111; the cold source for the pressurized condensing oil heat exchanger A3031 is provided by the second refrigeration compressor 3121; the cold source for the water removal heat exchanger B3022 is provided by the third refrigeration compressor 3112; and the cold source for the pressurized condensing oil heat exchanger B3032 is provided by the fourth refrigeration compressor 3122.

[0128] Among them, the power supply required by moving components such as the first refrigeration compressor 3111, the second refrigeration compressor 3121, the third refrigeration compressor 3112, the fourth refrigeration compressor 3122, the gas compressor 203, the air-cooled fan 2061, and the oil-cooled fan 2091, as well as the control power required by various valves and instruments, are all provided by the associated gas generator 501, so as to realize the island operation of the entire device / system (that is, the entire device / system does not require external power supply and operates in an island).

[0129] In some embodiments, the exhaust valve 403 is a normally open valve (FO). The symbol for a normally open valve is FO. When the power is off, the valve is in the open state, and its opening and closing can be controlled by the power supply.

[0130] In this example, when the associated gas from the oilfield is introduced for the first time, it first passes through the intake flow meter 101, the intake flame arrester 102, the exhaust valve 403, the second intermediate check valve 504, and the inlet check valve 502 before entering the associated gas generator 501 for power generation. After generating electricity, it can provide power supply for the entire device / system.

[0131] When the associated gas generator 501 generates electricity, the refrigeration compressor of the A-side branch or the B-side branch can be started to establish the cold field temperature of the corresponding branch's water removal heat exchanger and pressurized condensing oil separator heat exchanger. After the cold field temperature is established, the outlet gas emergency discharge valve 403 is closed, the gas compressor 203 is started, and the inlet gas shut-off valve and outlet gas shut-off valve of the corresponding branch are opened. This completes the system operation process of oilfield associated gas for intake, compression and transportation, pressurization and condensation, and dry gas power generation.

[0132] In this embodiment, the power generation of the associated gas generator 501 × 0.8 is greater than or equal to (the sum of the maximum power consumption of all electrical equipment, including the first refrigeration compressor 3111, the second refrigeration compressor 3121, the third refrigeration compressor 3112, the fourth refrigeration compressor 3122, the gas compressor 203, the air-cooled fan 2061, the oil-cooled fan 2091, and all valves and instruments in the device / system) × 120%.

[0133] In this example, the first preset oxygen content threshold is adjustable, and in this example, the first preset oxygen content threshold is set to 5%.

[0134] In this example, the first preset pressure threshold is adjustable, and in this example, the first preset pressure threshold is set to 2500 Pa.

[0135] In this example, the rated flow rate of the entire equipment is adjustable; in this example, the rated flow rate of the entire equipment is set to 3000 m³ / h. 3 / d.

[0136] In this example, the set pressure of the oil separator safety valve 404 is set to 0.96 MPa. In case of overpressure, specifically when the pressure of the oil separator safety valve 404 exceeds its set pressure, the oil separator safety valve 404 opens, and gas is discharged from the valve's outlet, promptly releasing excess pressure from the entire compression and conveying unit / device / system to prevent further pressure build-up and effectively prevent accidents. Of course, in some specific embodiments or application examples, the set pressure of the oil separator safety valve 404 can also be set to 0.96 ± 0.03 MPa.

[0137] In this example, the third preset pressure threshold is adjustable, and in this example, the third preset pressure threshold is set to 0.88 MPa.

[0138] In this example, the first preset liquid level threshold is adjustable, and in this example, the first preset liquid level threshold is set to 50mm.

[0139] In this example, the first preset air-cooling threshold is adjustable, and in this example, the first preset air-cooling threshold is set to 40°C.

[0140] In this example, the second preset air-cooling threshold is adjustable, and in this example, the second preset air-cooling threshold is set to 25°C.

[0141] In this example, the first preset oil cooling threshold is adjustable, and in this example, the first preset oil cooling threshold is set to 60°C.

[0142] In this example, the second preset oil cooling threshold is adjustable, and in this example, the second preset oil cooling threshold is set to 50°C.

[0143] In this example, specifically, the A-side branch and the B-side branch are switched periodically according to a set time period, where T is the time period for switching, and T is adjustable.

[0144] In this example, the timer switching period for side A and side B is set to T=4, meaning one cycle is 4 hours. The pressurized condensation unit uses a dual-branch channel. When one branch / channel is working, the other branch / channel automatically enters the defrosting process to eliminate ice blockage. This periodic and uninterrupted switching of the dual branches / channels effectively ensures continuous air intake for the intake unit, allowing the entire process / device / system / equipment to operate continuously for 24 hours.

[0145] In this example, when the branch line A is ventilated, the inlet shut-off valve A3061 and the outlet shut-off valve A3071 are open; when the branch line A is not ventilated, the inlet shut-off valve A3061 and the outlet shut-off valve A3071 are closed.

[0146] In this example, when the B-side branch is ventilated, the inlet shut-off valve B3062 and the outlet shut-off valve B3072 are open; when the B-side branch is not ventilated, the inlet shut-off valve B3062 and the outlet shut-off valve B3072 are closed.

[0147] Among them, the intake shut-off valve A3061 and the exhaust shut-off valve A3071 on the A side branch are opened and closed at the same time.

[0148] Among them, the intake shut-off valve B3062 and the exhaust shut-off valve B3072 on the B side branch open and close at the same time.

[0149] In this example, specifically, after the associated gas generator 501 generates electricity for the first time and the A-side branch is selected for gas supply, the first refrigeration compressor 3111 and the second refrigeration compressor 3121 on the A-side branch are started to establish the cold field temperature of the dewatering heat exchanger A3021 (+5℃ cold field) and the pressurized condensing oil-separating heat exchanger A3031 (-35℃ cold field). (The initial cold field temperature establishment takes about 30 minutes. After about 30 minutes, the dewatering heat exchanger A3021 reaches the first-level cold field temperature, such as +5℃, and the pressurized condensing oil-separating heat exchanger A3031 reaches the second-level cold field temperature, such as -35℃.) After the initial cold field temperature is established, the exhaust valve 403 is closed, the gas compressor 203 is started, and the intake shut-off valve A3061 and the exhaust shut-off valve A3071 are opened. The conventional system operation process for oilfield associated gas intake, compression and transportation, pressurization and condensation, and dry gas power generation is then carried out.

[0150] In this example, specifically, after the associated gas generator 501 generates electricity for the first time and the B-side branch is selected for gas supply, the third refrigeration compressor 3112 and the fourth refrigeration compressor 3122 on the B-side branch are started to establish the cold field temperature of the dewatering heat exchanger B3022 (+5℃ cold field) and the pressurized condensing oil-separating heat exchanger B3032 (-35℃ cold field). (The initial cold field temperature establishment takes about 30 minutes. After about 30 minutes, the dewatering heat exchanger A3021 reaches the first-level cold field temperature, such as +5℃, and the pressurized condensing oil-separating heat exchanger A3031 reaches the second-level cold field temperature, such as -35℃.) After the initial cold field temperature is established, the exhaust valve 403 is closed, the gas compressor 203 is started, and the intake shut-off valve B3062 and the exhaust shut-off valve B3072 are opened. The conventional system operation process for oilfield associated gas intake, compression and transportation, pressurization and condensation, and dry gas power generation is then carried out.

[0151] In this example, when the associated gas generator 501 is continuously generating electricity, if switching between branch A and branch B is required, before switching, the refrigeration compressor of the other branch (the branch about to be ventilated) is started to establish the cold field temperature of the corresponding branch's dewatering heat exchanger and pressurized condensing oil separator. After the cold field temperature is established, the inlet and outlet shut-off valves of the original venting branch are closed, and the inlet and outlet shut-off valves of the branch about to be ventilated are opened / opened, achieving seamless and flexible switching between the two branches, enabling the associated gas from the oilfield to be ventilated for intake, compression, transportation, pressurization, and condensation. And continuous operation of dry gas power generation; the original gas supply branch that is switched (i.e. shut down) is switched from refrigeration mode to defrosting mode (the associated gas contains trace amounts of moisture, which will freeze and block the gas passage below zero degrees Celsius, requiring regular defrosting to ensure that the gas passage is unobstructed when the gas is introduced in the next cycle, and the equipment of the device / system can operate continuously). After defrosting, the branch is shut down, and the refrigeration compressor of the branch is restarted before the next branch switch to enter refrigeration mode to establish the cold field temperature of the water removal heat exchanger and the pressurized condensing oil separator heat exchanger of the branch; this alternating cycle is repeated.

[0152] In this example, specifically, when the associated gas generator 501 is continuously generating electricity, if a switch is made from branch A to branch B, before the switch, the third refrigeration compressor 3112 and the fourth refrigeration compressor 3122 on branch B are started first to establish the cold field temperature of the dewatering heat exchanger B3022 (+5℃ cold field) and the pressurized condensing oil separator heat exchanger B3032 (-35℃ cold field). After the cold field temperature is established, the inlet shut-off valve B3062 and the outlet shut-off valve B3072 of branch B are opened / opened, and the inlet shut-off valve A3061 and the outlet shut-off valve A3071 of branch A are closed to realize the switch from branch A to branch B. Seamless switching of the branch to side B enables continuous operation of associated gas intake, compression and transportation, pressurization and condensation, and dry gas power generation in the oilfield. The branch to side A, which is switched (i.e. shut down), switches from cooling mode to defrosting mode. After defrosting, the first refrigeration compressor 3111 and the second refrigeration compressor 3121 of the branch to side A are shut down. The first refrigeration compressor 3111 and the second refrigeration compressor 3121 of the branch to side A are restarted before the next branch switch to enter the cooling mode, and the cold field temperature of the dewatering heat exchanger A3021 and the pressurization and condensation oil separator A3031 of the branch to be established. This alternating cycle continues.

[0153] In this example, specifically, when the associated gas generator 501 is continuously generating electricity, if a switch is made from branch B to branch A, before the switch, the first refrigeration compressor 3111 and the second refrigeration compressor 3121 on branch A are started first to establish the cold field temperature of the dewatering heat exchanger A3021 (+5℃ cold field) and the pressurized condensing oil separator heat exchanger A3031 (-35℃ cold field). After the cold field temperature is established, the inlet shut-off valve A3061 and the outlet shut-off valve A3071 of branch A are opened / closed, and the inlet shut-off valve B3062 and the outlet shut-off valve B3072 of branch B are closed to realize the switch. Seamless switching of the branch line to side A enables continuous operation of associated gas intake, compression and transportation, pressurization and condensation, and dry gas power generation in the oilfield. The branch line B, which is switched (i.e. shut down), switches from cooling mode to defrosting mode. After defrosting, the third refrigeration compressor 3112 and the fourth refrigeration compressor 3122 of the branch line B are shut down. They are restarted before the next branch switching to enter cooling mode, and the cold field temperature of the dewatering heat exchanger B3022 and the pressurized condensing oil separator heat exchanger B3032 of the branch line B is established. This alternating cycle continues.

[0154] In this example, specifically in the dry gas power generation unit 500, the associated gas from the oilfield is also included: when the associated gas from the oilfield is first introduced, the associated gas passes through the intake flow meter 101, the intake flame arrester 102, the exhaust valve 403, the second intermediate check valve 504, and the inlet check valve 502 in sequence, and is then input into the associated gas generator 501 for power generation. After generating electricity, it can provide power supply for the entire device / system.

[0155] When the associated gas processing capacity of the oilfield exceeds the maximum power distribution demand of the recovery unit / system, the remaining associated gas dry gas can be output to external equipment in sequence through the self-regulating valve 507, the outlet check valve 508 and the outlet flame arrester 506, such as to the subsequent pipeline network, power generation, LNG or CNG processing unit.

[0156] LNG is an abbreviation for Liquefied Natural Gas, which is the product of natural gas being purified and liquefied under ultra-low temperature conditions (such as -162°C).

[0157] CNG is an abbreviation for Compressed Natural Gas, which refers to gaseous natural gas compressed to a pressure greater than or equal to 10 MPa and not greater than 25 MPa. Natural gas is pressurized and stored in a gaseous state in a container.

[0158] In this example, the associated gas processing capacity of the oilfield is 3000 m³. 3 / d, producing approximately 3000m³ of dry gas.3 / d×70%=2100m 3 / d=87.5m 3 / h, the power generation (gas:electricity = 1:3) is 87.5 × 3 = 262.5 kWh, and the maximum power distribution capacity of the operating equipment is calculated to be 50 kW (corresponding to 17 m³ of dry gas). 3 / h), considering the margin, an 80kW generator is selected, indicating that there is still approximately 70m 3 The amount of dry gas per hour is not being used up, meaning that the processing capacity of associated gas from the oilfield exceeds the maximum power distribution requirements of the recovery unit / system.

[0159] In this embodiment, the outlet flame arrester 506 is used to prevent the propagation of the outlet flame; a self-regulating regulating valve 505 is set in parallel with the self-regulating regulating valve 507 to improve the reliability of the regulating valve; the inlet check valve 502, the first intermediate check valve 503, the second intermediate check valve 504 and the outlet check valve 508 are used to ensure the correct gas flow direction and prevent gas backflow.

[0160] In this example, the inlet pressure threshold of the self-regulating valve 507 is set to approximately 0.7 MPa. In this invention, the inlet pressure threshold of the self-regulating valve 507 is adjustable, for example, it can be adjusted according to the pipeline pressure, and set to 0.7 MPa ± 0.1 MPa.

[0161] In this example, the inlet pressure threshold of the self-regulating valve 505 is set to approximately 0.7 MPa. In this invention, the inlet pressure threshold of the self-regulating valve 505 is adjustable, for example, it can be adjusted according to the pipeline pressure, and set to 0.7 MPa ± 0.1 MPa.

[0162] In this example, in the above-mentioned compression and conveying unit 200, the gas temperature after being pressurized by the gas compressor 203 is between 60 and 80°C, and then cooled to about 45°C by the gas-cooled heat exchanger 2062.

[0163] In this example, the first compression pressure threshold is set to 0.8 MPa.

[0164] In this example, the oil-gas check valve 205 is mechanical, and its pressure setting value is 0.4 MPa.

[0165] In this example, the inlet pressure threshold of the self-regulating valve 507 is adjustable, and in this example it is set to 0.7MPa.

[0166] In this example, the inlet pressure threshold of the automatic control valve 505 is adjustable, and in this example it is set to 0.7MPa.

[0167] In this example, the cooling temperature of the water removal heat exchanger A3021 is +5℃.

[0168] In this example, the cold field temperature of the pressurized condensing oil heat exchanger A3031 is -35℃.

[0169] In this example, the cooling temperature of the water removal heat exchanger B3022 is +5℃.

[0170] In this example, the cold field temperature of the pressurized condensing oil heat exchanger B3032 is -35℃.

[0171] In this example, the cooling field temperature of the air-cooled recovery heat exchanger 301 is 15°C.

[0172] In this example, the exhaust valve 403 is a normally open valve.

[0173] In this example, the gas compressor used is a variable frequency single screw compressor, which combines oil injection and exhaust cooling. The exhaust temperature does not exceed 45°C, and the device / system can safely and reliably deliver gas at room temperature.

[0174] The term "full quantification" (meaning complete energy conversion) mentioned in this article can also be referred to as "full energy conversion." It can be simply called "full quantification," meaning that in the associated gas recovery from oil fields, based on the structure and construction provided by this invention, liquid condensate oil and other substances are recovered, while the gas can be used for power generation, maximizing the conversion of all associated gas from oil fields into energy.

[0175] In this invention, the interlocking control between components, the opening / closing / starting / stopping of components, the switching / conversion / adjustment of various operating modes (including the switching / conversion / adjustment of operating modes related to branch A and branch B), and the opening / closing or adjustment of related valves can be performed manually or automatically through PLC control logic. The automatic switching / control / adjustment here can be implemented using conventional control logic found in existing technologies, and will not be elaborated further. In some preferred embodiments, various transmitters and / or sensors can be further integrated to achieve automatic switching / conversion / adjustment of relevant operating modes.

[0176] The term ***A mentioned in the text can also be referred to as route A. The term ***B mentioned in the text can also be referred to as route B. "***" can refer to a water-removing heat exchanger, a pressurized condensing oil-separating heat exchanger, an inlet shut-off valve, an outlet shut-off valve, etc.

[0177] The gas phase pipeline connection mentioned in the text can also be referred to as a gas path connection; the gas phase pipeline mentioned in the text can also be referred to as a gas phase pipeline. The oil phase pipeline mentioned in the text can also be referred to as an oil phase pipeline. The interlock control mentioned in the text can also be referred to as an interlock control. The inlet / outlet mentioned in the text can also be referred to as an inlet / outlet, or an inlet / outlet terminal.

[0178] The associated gas recovery device for Dokdo-type oilfields described in this article can also be called a Dokdo-type associated gas full-quantity recovery device, or a Dokdo-type associated gas quantitative recovery device, or a Dokdo-type associated gas recovery system, or a Dokdo-type associated gas full-quantity recovery system, or a Dokdo-type associated gas quantitative recovery system, or a Dokdo-type recovery device / system for associated gas in oilfields, or a Dokdo-type full-quantity recovery device / system for associated gas in oilfields.

[0179] The Dokdo-style full-quantitation recovery device / system for associated gas in oil fields described in this text can also be referred to as a Dokdo-style quantitative recovery device / system for / based on associated gas in oil fields, or a Dokdo-style recovery device / system for / based on associated gas in oil fields. The Dokdo-style full-quantitation recovery method for associated gas in oil fields described in this text can also be referred to as a Dokdo-style quantitative recovery method for / based on associated gas in oil fields, or a Dokdo-style recovery method for / based on associated gas in oil fields. The term "full quantitation" (meaning complete energization) in this text can also be referred to as complete energization, or simply quantification. The " / " in this text indicates "or".

[0180] The above embodiments do not constitute a limitation on this utility model. Any changes and modifications made by those skilled in the art without departing from the technical concept of this utility model shall fall within the protection scope of this utility model.

Claims

1. A dokdo-type associated gas recovery device for oilfields, characterized in that: It includes an intake unit (100), a compression and delivery unit (200) connected to the gas phase pipeline of the intake unit (100), a pressurization and condensation unit (300) connected to the gas phase pipeline of the compression and delivery unit (200), a dry gas power generation unit (500) connected to the gas phase pipeline of the pressurization and condensation unit (300), and a rapid exhaust unit (400) connected to the gas phase pipelines of the intake unit (100), the compression and delivery unit (200), and the dry gas power generation unit (500).

2. The associated gas recovery device for Dokdo-type oilfields according to claim 1, characterized in that: The intake unit (100) includes an intake flow meter (101) and an intake flame arrester (102) connected to the outlet end of the intake flow meter (101); The gas inlet of the associated gas from the oilfield is connected to the inlet end of the gas flow meter (101); a gas pressure transmitter (106) is installed on the pipeline connecting the gas inlet of the associated gas from the oilfield to the inlet end of the gas flow meter (101); an oxygen content detector (103) is installed on the pipeline connecting the outlet of the gas flame arrester (102) to the compression and delivery unit (200).

3. The associated gas recovery device for Dokdo-type oilfields according to claim 2, characterized in that: The gas phase pipeline of the compression and delivery unit (200) includes an inlet filter (201), a loading valve (202) connected to the outlet end of the inlet filter (201), a gas compressor (203) connected to the outlet end of the loading valve (202), a first oil-gas separator (204) connected to the outlet end of the gas compressor (203), an oil-gas check valve (205) connected to the first outlet end of the first oil-gas separator (204), a reflux shut-off valve (214) connected to the second outlet end of the first oil-gas separator (204), and an air-cooled heat exchanger (2062) connected to the outlet end of the oil-gas check valve (205). The other end of the backflow shut-off valve (214) is connected to the inlet end of the loading valve (202).

4. The associated gas recovery device for Dokdo-type oilfields according to claim 3, characterized in that: The outlet end of the air-cooled heat exchanger (2062) is connected to the hot-side gas inlet of the air-cooled recovery heat exchanger (301) in the pressurized condensing unit (300); the inlet end of the air intake filter (201) is connected to the outlet of the air intake flame arrester (102) in the air intake unit (100); and / or An oil temperature transmitter (213) is installed on the pipeline connecting the outlet of the gas compressor (203) and the inlet of the first oil-gas separator (204); an air-cooled temperature transmitter (207) and an outlet pressure transmitter (208) are installed on the outlet pipeline of the air-cooled heat exchanger (2062). A liquid level transmitter (210) is provided in the liquid storage section at the bottom of the first oil-gas separator (204).

5. The associated gas recovery device for Dokdo-type oilfields according to claim 1, characterized in that: The oil phase pipeline of the compression and delivery unit (200) includes a first oil-gas separator (204), an oil-cooled heat exchanger (2092) connected to the oil outlet of the first oil-gas separator (204), an oil filter (211) connected to the outlet of the oil-cooled heat exchanger (2092), and an oil shut-off valve (212) connected to the outlet of the oil filter (211); the other end of the oil shut-off valve (212) is connected to the oil return port of the gas compressor (203).

6. The associated gas recovery device for Dokdo-type oilfields according to claim 1, characterized in that: The pressurized condensing unit (300) includes an air-cooled recovery heat exchanger (301), an inlet shut-off valve A (3061) located on side branch A connected to the hot-side gas outlet of the air-cooled recovery heat exchanger (301), a water removal heat exchanger A (3021) connected to the outlet of the inlet shut-off valve A (3061), a pressurized condensing oil-separating heat exchanger A (3031) connected to the outlet of the water removal heat exchanger A (3021), and a pressurized condensing oil-separating heat exchanger A (3031) connected to the outlet of the pressurized condensing oil-separating heat exchanger A (3031). The gas shut-off valve A (3071), the gas shut-off valve B (3062) located on the B side branch connected to the hot side gas outlet of the gas-cooled recovery heat exchanger (301), the water removal heat exchanger B (3022) connected to the gas outlet of the gas shut-off valve B (3062), the pressurized condensing oil separation heat exchanger B (3032) connected to the gas outlet of the water removal heat exchanger B (3022), and the gas shut-off valve B (3072) connected to the gas outlet of the pressurized condensing oil separation heat exchanger B (3032); The pressurized condensing unit (300) also includes a second oil-gas separator (304); the outlet end of the gas shut-off valve A (3071) and the outlet end of the gas shut-off valve B (3072) are both connected to the inlet end of the second oil-gas separator (304); the outlet end of the second oil-gas separator (304) is connected to the cold side gas inlet of the gas-cooled recovery heat exchanger (301).

7. The associated gas recovery device for Dokdo-type oilfields according to claim 1, characterized in that: The pressurized condensing unit (300) further includes a first refrigeration compressor (3111) that provides a cold source for the water removal heat exchanger A (3021), a second refrigeration compressor (3121) that provides a cold source for the pressurized condensing oil-separating heat exchanger A (3031), a third refrigeration compressor (3112) that provides a cold source for the water removal heat exchanger B (3022), a fourth refrigeration compressor (3122) that provides a cold source for the pressurized condensing oil-separating heat exchanger B (3032), and a condensate tank (305); The outlet ends of the water removal heat exchanger A (3021), the pressurized condensing oil-separating heat exchanger A (3031), the water removal heat exchanger B (3022), the pressurized condensing oil-separating heat exchanger B (3032), and the second oil-gas separator (304) are all connected to the inlet end of the condensate tank (305).

8. The associated gas recovery device for Dokdo-type oilfields according to claim 3, characterized in that: The emergency exhaust unit (400) includes an intake emergency exhaust valve (401), a flame arrestor single call valve (402) connected to the exhaust end of the intake emergency exhaust valve (401), an oil separation safety valve (404) connected to the third exhaust end of the first oil-gas separator (204), and an exhaust emergency exhaust valve (403) connected to the intake end of the intake emergency exhaust valve (401). The inlet end of the intake quick exhaust valve (401) is connected to the outlet of the intake flame arrester (102) in the intake unit (100); The outlet end of the oil separator safety valve (404) is connected to the inlet end of the flame arrestor single call valve (402); The outlet end of the gas exhaust valve (403) is connected to the inlet end of the second intermediate check valve (504) in the dry gas power generation unit (500).

9. The associated gas recovery device for Dokdo-type oilfields according to claim 8, characterized in that: The dry gas power generation unit (500) includes a first intermediate check valve (503), an inlet check valve (502) connected to the outlet end of the first intermediate check valve (503), an inlet associated gas generator (501) connected to the outlet end of the inlet check valve (502), a self-regulating valve (507) connected to the outlet end of the first intermediate check valve (503), an outlet check valve (508) connected to the outlet end of the self-regulating valve (507), an outlet flame arrester (506) connected to the outlet end of the outlet check valve (508), and a second intermediate check valve (504) connected to the outlet end of the outlet exhaust valve (403). The inlet end of the first intermediate check valve (503) is connected to the cold side gas outlet of the gas-cooled recovery heat exchanger (301); The other end of the second intermediate check valve (504) is connected to the inlet end of the inlet check valve (502).

10. The associated gas recovery device for Dokdo-type oilfields according to claim 9, characterized in that: The dry gas power generation unit (500) also includes a self-controlled regulating valve (505) connected in parallel with both ends of the self-regulating regulating valve (507); The other end of the second intermediate check valve (504) is connected to the outlet end of the first intermediate check valve (503), the inlet end of the inlet check valve (502), the inlet end of the self-operated regulating valve (507), and the inlet end of the automatic regulating valve (505); the outlet end of the self-operated regulating valve (507) and the outlet end of the automatic regulating valve (505) are connected to the inlet end of the exhaust check valve (508).

11. The associated gas recovery device for Dokdo-type oilfields according to claim 4, characterized in that: The reflux shut-off valve (214) is interlocked with the gas compressor (203); and / or Interlocking control of the air-cooled temperature transmitter (207) and the air-cooled fan (2061); and / or Interlocking control of oil temperature transmitter (213) and oil cooler (2091); and / or Both the outlet pressure transmitter (208) and the level transmitter (210) are interlocked with the gas compressor (203); and / or The oxygen content detector (103), the inlet pressure transmitter (106), and the inlet flow meter (101) are all interlocked with the gas compressor (203); and / or The oxygen content detector (103), the intake pressure transmitter (106), and the intake flow meter (101) are all interlocked with the intake emergency exhaust valve (401).

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