A high gas-to-oil ratio station associated gas gathering device and application method thereof

Abstract

The present invention discloses a high gas-to-oil ratio station associated gas gathering device, including a skid, an air cooler on the skid is connected to a liquid distributor through a pipeline, the liquid distributor is connected to a compressor through a pipeline, the compressor is connected to an anhydrous calcium chloride dehydration device through a pipeline, the anhydrous calcium chloride dehydration device is connected to a filter and a gas flow meter through a pipeline, an explosion-proof junction box is electrically connected to the air cooler, the liquid distributor, the compressor, and the dehydration device, and a PLC cabinet is electrically connected to the air cooler, the liquid distributor, the compressor, the dehydration device, and the gas flow meter. The present invention solves the problems of large area occupied by scattered equipment and inconvenient operation in the prior art, ensures the effects of gas-liquid separation, pressurized dehydration, and external transmission metering of associated gas in oilfield high gas-to-oil ratio gathering and transportation stations, realizes the safe and efficient transportation of oilfield associated gas to downstream gathering and transportation stations, avoids the problem of freezing and blocking of associated gas gathering pipelines outside the station in winter, and reduces the labor quota of the station.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield station associated gas gathering and transportation, and specifically relates to a high gas-to-oil ratio station associated gas gathering device, and also relates to an application method of the high gas-to-oil ratio station associated gas gathering device. Background Art

[0002] The oilfield gathering and transportation station is the main production unit of the oilfield. The station mainly includes crude oil processing system, associated gas gathering and transportation system, crude oil heating system, water treatment and reinjection system, etc. In recent years, integrated integrated devices have been widely used in oilfield gathering and transportation stations. They have the advantages of easy relocation, high integration, strong unit functions, and self-contained control system. Since the skid-mounted device adopts a dense layout and compact layout, it can greatly reduce the area occupied by the gathering and transportation station, and has been widely used in oilfield gathering and transportation stations. The research and development and application of integrated integrated device stations have accelerated the speed of oilfield ground construction, and played a positive role in optimizing process flow, saving construction land, reducing on-site labor, and reducing safety risks.

[0003] At present, the associated gas volume of oilfield gathering and transportation stations is small and scattered, and the available pressure energy is limited. Especially in winter, due to the saturated water content of associated gas, pipelines are prone to freezing and blocking, resulting in the inability to effectively collect associated gas. At the same time, except for the associated gas gathering and transportation system, the other systems of the oilfield gathering and transportation station adopt integrated integrated devices to carry out ground system construction, which has the advantages of small footprint, fast construction speed, and high degree of automation. At present, the plane layout of the associated gas gathering and transportation area is relatively messy, which not only affects the construction speed of the skid-mounted station, but also increases the labor intensity of on-site workers. Summary of the invention

[0004] The purpose of the present invention is to provide a high gas-to-oil ratio station associated gas gathering device, which solves the problems of the existing technology that the equipment is scattered, occupies a large area and is inconvenient to operate.

[0005] The present invention also aims to provide an application method of a high gas-to-oil ratio station associated gas gathering device.

[0006] The technical solution adopted by the present invention is a high gas-to-oil ratio station associated gas gathering device, including a skid, the skid includes six areas, the six areas are respectively an air cooling area, a liquid separation area, a pressurization area, a dehydration area, a metering area, and a control area, an air cooler is installed in the air cooling area, a liquid separator is installed in the liquid separation area, a compressor is installed in the pressurization area, an anhydrous calcium chloride dehydration device is installed in the dehydration area, a filter and a gas flow meter are installed in sequence in the metering area, and an explosion-proof junction box and a PLC cabinet are installed in the control area; the air cooler is connected to the liquid separator through a pipeline, the liquid separator is connected to the compressor through a pipeline, the compressor is connected to the anhydrous calcium chloride dehydration device through a pipeline, the anhydrous calcium chloride dehydration device is connected to the filter and the gas flow meter through a pipeline, the explosion-proof junction box is electrically connected to the air cooler, the liquid separator, the compressor, and the anhydrous calcium chloride dehydration device, and the PLC cabinet is electrically connected to the air cooler, the liquid separator, the compressor, the anhydrous calcium chloride dehydration device, and the gas flow meter.

[0007] The present invention is also characterized in that:

[0008] The inlet end of the air cooler is connected to the inlet pipeline of the air cooler, and a stop valve b is installed on the inlet pipe of the air cooler. The outlet end of the air cooler is connected to the outlet pipeline of the air cooler. The outlet pipeline of the air cooler is successively installed with stop valve c and stop valve d from upstream to downstream, and the outlet pipeline of the air cooler is extended to be connected to the inlet of the liquid distributor.

[0009] The liquid distributor includes an air cooler drain pipeline, an associated gas liquid distributor hot water inlet pipeline, a liquid distributor return water discharge pipeline, a liquid distributor vent pipeline and a liquid distributor associated gas outlet pipeline; a stop valve e is installed on the associated gas liquid distributor hot water inlet pipeline; a stop valve f is installed on the liquid distributor return water discharge pipeline; a stop valve g is installed on the liquid distributor associated gas outlet pipeline, and the liquid distributor associated gas outlet pipeline extends to be connected to the associated gas compressor inlet.

[0010] The compressor comprises a compressor drain pipeline and a compressor outlet pipeline, a drain valve b is installed on the compressor drain pipeline, the compressor drain pipeline is connected to the dehydration device drain pipeline, a drain valve c is arranged on one end of the dehydration device drain pipeline close to the anhydrous calcium chloride dehydration device, a stop valve h is installed on the compressor outlet pipeline, and the compressor outlet pipeline is extended to the anhydrous calcium chloride dehydration device.

[0011] The anhydrous calcium chloride dehydration device comprises a dehydration device sewage pipeline and a dehydration device outlet pipeline. The dehydration device outlet pipeline is divided into two branch pipelines. One branch pipeline is connected to the dehydration device vent pipeline. The other branch pipeline is provided with a stop valve i on the dehydration device outlet pipeline, and is connected to the dehydration device filter pipeline through the stop valve i.

[0012] The venting pipeline of the dehydration device is divided into two branch pipelines. A ball valve d is installed on one branch pipeline and then connected to the pipeline from the dehydration device to the filter. A ball valve e, a safety valve b, and a ball valve f are installed on the other branch pipeline in sequence and then connected to the bypass pipeline of the associated gas metering system.

[0013] The pipeline from the dehydration device to the filter is divided into two branch pipelines, one branch pipeline is connected to the bypass pipeline of the associated gas metering system, a stop valve l is set on the bypass pipeline of the associated gas metering system, and a stop valve j is installed on the other branch pipeline, which is connected to the filter through the stop valve j.

[0014] The filter is connected to an associated gas export pipeline, on which a gas flow meter and a stop valve k are arranged in sequence, and the associated gas export pipeline is connected to a bypass pipeline of an associated gas metering system.

[0015] An air cooler bypass pipeline is arranged between the air cooler inlet pipe and the air cooler outlet pipeline. One end of the air cooler bypass pipeline is connected to the air cooler inlet pipe upstream of the stop valve b, and the other end is connected to the air cooler outlet pipeline downstream of the stop valve c. The stop valve a is installed on the air cooler bypass pipeline.

[0016] The distributor vent line is divided into two branch lines. One branch line is installed with ball valve a and then connected to the bypass line of the associated gas metering system. The other branch line is installed with ball valve b, safety valve a, ball valve c in sequence and then connected to the bypass line of the associated gas metering system. The bypass line of the associated gas metering system is connected to the distributor vent line, and ball valve a is installed on the bypass line of the associated gas metering system.

[0017] A drain valve a and a gate valve are installed in sequence on the drain pipeline of the air cooler, and the position between the drain valve a and the gate valve is connected to the drain pipeline of the dehydration device.

[0018] Another technical solution adopted by the present invention is an application method of an integrated device for measuring liquid separation of associated gas with a high gas-oil ratio, which is specifically implemented according to the following steps:

[0019] The associated gas enters the air cooler from the air cooler inlet pipeline, is cooled by the air cooler, and the temperatures of the inlet and outlet thermometers of the air cooler are inspected. When the outlet temperature drops to 18-22°C, the associated gas enters the liquid separator from the air cooler outlet pipeline for gas-liquid separation. The separated associated gas passes through the liquid separator associated gas outlet pipeline and enters the compressor for pressurization. After being pressurized to 0.6MPa, it enters the anhydrous calcium chloride dehydration device through the compressor outlet pipeline for dehydration. It is dehydrated to a qualified water dew point and then, after meeting the standards, it passes through the dehydration device to the filter pipeline to the filter and the gas flowmeter for measurement, and then is transported to the downstream station, completing the liquid separation and metering process of the associated gas.

[0020] When the pressure of the liquid separator is released, the pressure is released through the liquid separator vent line and safety valve a. The condensate oil in the liquid separator flows through the air cooler drain line. When the condensate accumulates to the set value of drain valve a, drain valve a automatically opens; the condensate oil in the compressor flows through the compressor drain line. When the condensate accumulates to the set value of drain valve b, drain valve b automatically opens;

[0021] When the anhydrous calcium chloride dehydration device is depressurized, the dehydration device vent pipeline and safety valve b are used to vent and release the pressure. The condensate oil in the anhydrous calcium chloride dehydration device flows through the dehydration device sewage pipeline. When the condensate accumulates to the set value of the drain valve c, the drain valve c automatically opens;

[0022] The sewage systems of the liquid separator, compressor, and anhydrous calcium chloride dehydration device are collected into the sewage pipeline of the dehydration device and flow to the waste oil recovery device in the station. The outlet gate valve of the sewage pipeline of the dehydration device is in the normally open state.

[0023] The beneficial effects of the present invention are as follows: the present invention is a high gas-to-oil ratio station associated gas gathering device, which integrates air cooling, liquid separation, pressurization, dehydration and metering of associated gas. On the basis of solving the problem that wet associated gas cannot be effectively transported, the device has a high level of automatic control and meets the requirements of unmanned gathering and transportation stations. The equipment uses automatic drain valves to discharge sewage, which reduces the labor intensity of on-site workers and realizes the centralized and full utilization of crude oil associated gas, so that the huge crude oil associated gas resource wealth can be used scientifically, environmentally friendly, safely and feasible. After cooling, separation, pressurization, dehydration and metering operations, the oil field associated gas is transported to the downstream station, which solves the problems of difficulty in gathering and transporting oil field associated gas in winter, easy freezing and blockage of pipelines, and insufficient pressure energy of the gas gathering system, and meets the safe production and operation requirements of the gas gathering system in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a high gas-to-oil ratio station associated gas gathering device of the present invention.

[0025] In the figure, 1. skid, 2. air cooler, 3. liquid distributor, 301. drain valve a, 302. drain valve b, 303. drain valve c, 4. compressor, 401. ball valve a, 402. ball valve b, 403. ball valve c, 404. ball valve d, 405. ball valve e, 406. ball valve f, 5. anhydrous calcium chloride dehydration device, 501. safety valve a, 502. safety valve b, 6. filter, 600. air cooler bypass pipeline, 601. air cooler inlet pipeline, 602. air cooler outlet pipeline, 603. air cooler sewage pipeline, 604. associated gas liquid distributor hot water inlet pipeline, 605. liquid distributor return water discharge pipeline, 606. liquid distributor vent pipeline, 607. liquid distributor associated gas outlet pipeline, 608. compressor exhaust Sewage pipeline, 609. compressor outlet pipeline, 610. dehydration device sewage pipeline, 611. dehydration device outlet pipeline, 612. dehydration device vent pipeline, 613. dehydration device filter pipeline, 614. associated gas transmission pipeline, 615. associated gas metering system bypass pipeline, 616. dehydration device filter pipeline, 7. gas flow meter, 700. stop valve a, 701. stop valve b, 702. stop valve c, 703. stop valve d, 704. stop valve e, 705. stop valve f, 706. stop valve g, 707. stop valve h, 708. stop valve i, 709. stop valve j, 710. stop valve k, 711. stop valve l, 8. explosion-proof junction box, 801. gate valve, 9. PLC cabinet. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a high gas-to-oil ratio station associated gas gathering device, such as Figure 1 As shown, the skid 1 includes six areas, which are an air cooling area, a liquid separation area, a pressurization area, a dehydration area, a metering area, and a control area. An air cooler 2 is installed in the air cooling area, a liquid separator 3 is installed in the liquid separation area, a compressor 4 is installed in the pressurization area, an anhydrous calcium chloride dehydration device 5 is installed in the dehydration area, a filter 6 and a gas flow meter 7 are installed in the metering area in sequence, and an explosion-proof junction box 8 and a PLC cabinet 9 are installed in the control area; the air cooler 2 is connected to the liquid separator 3 through a pipeline, the liquid separator 3 is connected to the compressor 4 through a pipeline, the compressor 4 is connected to the anhydrous calcium chloride dehydration device 5 through a pipeline, the anhydrous calcium chloride dehydration device 5 is connected to the filter 6 and the gas flow meter 7 through a pipeline, the explosion-proof junction box 8 is electrically connected to the air cooler 2, the liquid separator 3, the compressor 4, the anhydrous calcium chloride dehydration device 5, and the PLC cabinet 9 is electrically connected to the air cooler 2, the liquid separator 3, the compressor 4, the anhydrous calcium chloride dehydration device 5, and the gas flow meter 7.

[0028] The inlet end of the air cooler 2 is connected to the air cooler inlet pipeline 601, and the stop valve b701 is installed on the air cooler inlet pipe 601. The outlet end of the air cooler 2 is connected to the air cooler outlet pipeline 602. The stop valve c702 and the stop valve d703 are installed on the air cooler outlet pipeline 602 from upstream to downstream in sequence. The air cooler outlet pipeline 602 extends to the inlet of the liquid separator 3.

[0029] An air cooler bypass pipeline 600 is arranged between the air cooler inlet pipe 601 and the air cooler outlet pipeline 602. One end of the air cooler bypass pipeline 600 is connected to the air cooler inlet pipe 601 upstream of the stop valve b701, and the other end is connected to the air cooler outlet pipeline 602 downstream of the stop valve c702. The stop valve a700 is installed on the air cooler bypass pipeline 600. When the air cooler 2 fails and needs to be repaired, in order not to affect the associated gas production of the station, the stop valve a700 can be temporarily opened, and the stop valve b701 and the stop valve c702 can be closed, and the associated gas of the station can directly enter the associated gas separator 3 from the air cooler bypass pipeline 600.

[0030] The liquid distributor 3 includes an air cooler drain line 603, an associated gas liquid distributor hot water inlet line 604, a liquid distributor return water outlet line 605, a liquid distributor vent line 606 and a liquid distributor associated gas outlet line 607; a stop valve e704 is installed on the associated gas liquid distributor hot water inlet line 604; a stop valve f705 is installed on the liquid distributor return water outlet line 605;

[0031] The liquid distributor vent line 606 is divided into two branch lines, one of which is installed with ball valve a401 and then connected to the associated gas metering system bypass line 615, and the other branch line is installed with ball valve b402, safety valve a501, ball valve c403 in sequence and then connected to the associated gas metering system bypass line 615; the associated gas metering system bypass line 615 is connected to the liquid distributor vent line 606, and the associated gas metering system bypass line 615 is installed with ball valve a401 for safety reasons. When the safety valve a501 needs to be recalibrated, the ball valve a401 installed on the associated gas metering system bypass line 615 is opened and can be used only after the calibration is completed and reinstalled.

[0032] A drain valve a301 and a gate valve 801 are sequentially installed on the air cooler drain line 603 , and a position between the drain valve a301 and the gate valve 801 is connected to the dehydration device drain line 610 .

[0033] A stop valve g706 is installed on the associated gas outlet pipeline 607 of the liquid separator, and the associated gas outlet pipeline 607 of the liquid separator extends to be connected to the inlet of the associated gas compressor 4.

[0034] Compressor 4 includes a compressor drain pipeline 608 and a compressor outlet pipeline 609. A drain valve b302 is installed on the compressor drain pipeline 608, and the compressor drain pipeline 608 is connected to the dehydration device drain pipeline 610; a stop valve h707 is installed on the compressor outlet pipeline 609, and the compressor outlet pipeline 609 extends to the anhydrous calcium chloride dehydration device 5.

[0035] The anhydrous calcium chloride dehydration device 5 includes a dehydration device sewage pipeline 610 and a dehydration device outlet pipeline 611. The dehydration device sewage pipeline 610 is provided with a drain valve c303 at one end close to the anhydrous calcium chloride dehydration device 5;

[0036] The outlet pipeline 611 of the dehydration device is divided into two branch pipelines, one branch pipeline is connected to the vent pipeline 612 of the dehydration device, and a stop valve i708 is arranged on the outlet pipeline 611 of the dehydration device of the other branch pipeline, and the pipeline 613 to the filter of the dehydration device is connected through the stop valve i708; the vent pipeline 612 of the dehydration device is divided into two branch pipelines, one branch pipeline is installed with a ball valve d404 and then connected to the pipeline 616 to the filter of the dehydration device, and the other branch pipeline is successively installed with a ball valve e405, a safety valve b502, and a ball valve f406 and then connected to the bypass pipeline 615 of the associated gas metering system; the pipeline 613 to the filter of the dehydration device is divided into two branch pipelines, one branch pipeline is connected to the bypass pipeline 615 of the associated gas metering system, and a stop valve l711 is arranged on the bypass pipeline 615 of the associated gas metering system, and a stop valve j709 is installed on the other branch pipeline, and the pipeline is connected to the filter 6 through the stop valve j709.

[0037] The filter 6 is connected to the associated gas export pipeline 614, on which the gas flow meter 7 and the stop valve k710 are arranged in sequence, and the associated gas export pipeline 614 is connected to the associated gas metering system bypass pipeline 615. When the filter 6 needs to be cleaned due to clogging by debris, the use of the associated gas metering system bypass pipeline 615 will not affect production due to cleaning of the associated gas outlet pipeline filter 6 of the liquid separator.

[0038] Drain valve a301, drain valve b302 and drain valve c303 are all automatic drain valves. When the condensate in the device accumulates to a certain extent, drain valve a301, drain valve b302 and drain valve c303 automatically open to drain.

[0039] The inlet and outlet of the air cooler 2 are both provided with thermometers for detecting the inlet and outlet temperatures so as to discharge the cooled associated gas at a reasonable temperature; a thermometer is provided at the inlet of the flow meter 7.

[0040] The application method of the high gas-oil ratio associated gas liquid separation metering integrated device of the present invention is specifically implemented according to the following steps:

[0041] The associated gas enters the air cooler 2 from the air cooler inlet pipeline 601, is cooled by the air cooler 2, and the temperatures of the inlet and outlet thermometers of the air cooler 2 are inspected. When the outlet temperature drops to 18-22°C, the associated gas enters the liquid separator 3 from the air cooler outlet pipeline 602 for gas-liquid separation. The separated associated gas passes through the liquid separator associated gas outlet pipeline 607 and enters the compressor 4 for pressurization. After being pressurized to 0.6MPa, it enters the anhydrous calcium chloride dehydration device 5 for dehydration through the compressor outlet pipeline 609. After being dehydrated to a qualified water dew point and treated to meet the standard, it passes through the dehydration device to the filter pipeline 613 to the filter 6 and the gas flowmeter 7 for measurement, and then is transported to the downstream station, completing the liquid separation and metering process of the associated gas.

[0042] When the pressure of the liquid separator 3 is released, the pressure is released through the liquid separator vent line 606 and the safety valve a501. The condensate oil in the liquid separator 3 flows through the air cooler drain line 603. When the condensate accumulates to the set value of the drain valve a301, the drain valve a301 automatically opens; the condensate oil in the compressor 4 flows through the compressor drain line 608. When the condensate accumulates to the set value of the drain valve b302, the drain valve b302 automatically opens;

[0043] When the anhydrous calcium chloride dehydration device 5 is depressurized, the dehydration device vent line 612 and the safety valve b502 are vented and depressurized, and the condensate oil in the anhydrous calcium chloride dehydration device 5 flows through the dehydration device sewage pipeline 610. When the condensate accumulates to the set value of the drain valve c303, the drain valve c303 automatically opens;

[0044] The sewage systems of the liquid separator 3, the compressor 4 and the anhydrous calcium chloride dehydration device 5 are collected into the sewage pipeline 610 of the dehydration device and flow to the waste oil recovery device in the station. The outlet gate valve 801 of the sewage pipeline 610 of the dehydration device is in a normally open state.

[0045] The present invention aims at integrating the associated gas production and external transmission system into a skid at the current gathering and transportation station, thereby overcoming the problem of messy equipment layout in the station; the associated gas gathering device for a high gas-to-oil ratio station of the present invention has a simplified structure, shortens the construction and installation period, and reduces the floor space. The application method of the associated gas gathering device for a high gas-to-oil ratio station of the present invention ensures the gas-liquid separation effect of the associated gas in the oilfield gathering and transportation station, and integrates the main process equipment, pipelines, valves, power supply and distribution, instruments and other facilities such as associated gas air cooling, liquid separation, pressurization, dehydration, and metering into the skid, which is easy to move, disassemble, install and maintain. At the same time, the main equipment has an automatic liquid drainage function, which greatly reduces the labor intensity of operators of the associated gas system in the gathering and transportation station.

[0046] Example 1

[0047] An embodiment of an integrated device for metering liquid separation of associated gas with a high gas-oil ratio of the present invention comprises a skid 1, wherein the skid 1 comprises six areas, namely, an air cooling area, a liquid separation area, a pressurizing area, a dehydration area, a metering area, and a control area. An air cooler 2 is installed in the air cooling area, a liquid separator 3 is installed in the liquid separation area, a compressor 4 is installed in the pressurizing area, an anhydrous calcium chloride dehydration device 5 is installed in the dehydration area, a filter 6 and a gas flow meter 7 are installed in sequence in the metering area, and an explosion-proof junction box 8 and a PLC cabinet 9 are installed in the control area; the air cooler 2 is connected to the liquid separator 3 through a pipeline, the liquid separator 3 is connected to the compressor 4 through a pipeline, the compressor 4 is connected to the anhydrous calcium chloride dehydration device 5 through a pipeline, the anhydrous calcium chloride dehydration device 5 is connected to the filter 6 and the gas flow meter 7 through a pipeline, the explosion-proof junction box 8 is electrically connected to the air cooler 2, the liquid separator 3, the compressor 4, the anhydrous calcium chloride dehydration device 5, and the gas flow meter 7 respectively.

[0048] The skid 1 is rectangular, and the air cooler 2, the liquid distributor 3, the compressor 4, and the anhydrous calcium chloride dehydration device 5 are arranged in two rows on the skid 1. The associated gas outlet pipeline 615 of the liquid distributor is laid on the skid 1 along the length direction. All pipelines are connected by flanges. An explosion-proof junction box 8 is installed vertically upward on the edge of the short side of the skid 1. The explosion-proof junction box 8 is connected to the circuit cables of the air cooler 2, the liquid distributor 3, the compressor 4, and the anhydrous calcium chloride dehydration device 5 and supplies power to them; a PLC cabinet 9 is installed at the bottom of the explosion-proof junction box 8. The control cables of the air cooler 2, the liquid distributor 3, the compressor 4, the anhydrous calcium chloride dehydration device 5 and the gas flow meter 7 are connected to the PLC cabinet 9 to realize automatic control and remote start and stop of the above-mentioned equipment.

[0049] In this embodiment, the air cooler 2, the liquid separator 3, the compressor 4, and the anhydrous calcium chloride dehydration device 5 are respectively fixed on the rectangular skid 1 by anchor bolts. The air cooler 2 is selected to have a specification of 800Nm3 / h, the liquid separator 3 is selected to have a specification of Φ800, the compressor is selected to have a specification of 10000Nm3 / d, and the anhydrous ferric chloride is selected to have a specification of 10000Nm3 / d.

[0050] Example 2

[0051] An embodiment of an integrated device for liquid separation and metering of associated gas with a high gas-oil ratio of the present invention, an air cooler 2 is arranged on the north side of a skid 1, a liquid separator 3, a compressor 4, an anhydrous calcium chloride dehydration device 5, a filter 6, and a gas flow meter 7 are distributed on the skid 1 in a straight line along the length direction, and a liquid separator associated gas outlet pipeline 607 is laid on the skid 1 along the length direction. The skid 1 is rectangular, and an explosion-proof junction box 8 and a PLC cabinet 9 are installed vertically upward on the edge of its short side, and the explosion-proof junction box 8 is connected with circuit cables of the air cooler 2, the liquid separator 3, the compressor 4, and the anhydrous calcium chloride dehydration device 5 and supplies power to them.

[0052] Example 3

[0053] An embodiment of an integrated device for metering liquid separation of associated gas with a high gas-oil ratio of the present invention comprises a skid 1, which comprises six areas, namely, an air cooling area, a liquid separation area, a pressurizing area, a dehydration area, a metering area, and a control area. An air cooler 2 is installed in the air cooling area, a liquid separator 3 is installed in the liquid separation area, a compressor 4 is installed in the pressurizing area, an anhydrous calcium chloride dehydration device 5 is installed in the dehydration area, a filter 6 and a gas flow meter 7 are installed in the metering area in sequence, and an explosion-proof junction box 8 and a PLC cabinet 9 are installed in the control area; the air cooler 2 is connected to the liquid separator 3 through a pipeline, and the liquid separator 3 is connected to the pressure-reducing area through a pressure-reducing area. The liquid device 3 is connected to the compressor 4 through a pipeline, the compressor 4 is connected to the anhydrous calcium chloride dehydration device 5 through a pipeline, the anhydrous calcium chloride dehydration device 5 is connected to the filter 6 and the gas flow meter 7 through a pipeline, the explosion-proof junction box 8 is electrically connected to the air cooler 2, the liquid distributor 3, the compressor 4, and the anhydrous calcium chloride dehydration device 5, respectively, the PLC cabinet 9 is electrically connected to the air cooler 2, the liquid distributor 3, the compressor 4, the anhydrous calcium chloride dehydration device 5, and the gas flow meter 7, respectively, the inlet and outlet of the air cooler 2 are provided with thermometers; a thermometer is provided at the inlet of the flow meter 7.

[0054] The inlet end of the air cooler 2 is connected to the air cooler inlet pipeline 601, and the stop valve b701 is installed on the air cooler inlet pipe 601. The outlet end of the air cooler 2 is connected to the air cooler outlet pipeline 602. The stop valve c702 and the stop valve d703 are installed on the air cooler outlet pipeline 602 from upstream to downstream in sequence. The air cooler outlet pipeline 602 extends to the inlet of the liquid separator 3.

[0055] The separator 3 includes an air cooler drain pipeline 603, an associated gas separator hot water inlet pipeline 604, a separator return water discharge pipeline 605, a separator vent pipeline 606 and a separator associated gas outlet pipeline 607; a stop valve e704 is installed on the associated gas separator hot water inlet pipeline 604; a stop valve f705 is installed on the separator return water discharge pipeline 605; a drain valve a301 and a gate valve 801 are installed in sequence on the air cooler drain pipeline 603, and the position between the drain valve a301 and the gate valve 801 is connected to the dehydration device drain pipeline 610.

[0056] A stop valve g706 is installed on the associated gas outlet pipeline 607 of the liquid separator, and the associated gas outlet pipeline 607 of the liquid separator extends to be connected to the inlet of the associated gas compressor 4. The compressor 4 includes a compressor sewage pipeline 608 and a compressor outlet pipeline 609, and a drain valve b302 is installed on the compressor sewage pipeline 608, and the compressor sewage pipeline 608 is connected to the dehydration device sewage pipeline 610; a stop valve h707 is installed on the compressor outlet pipeline 609, and the compressor outlet pipeline 609 extends to be connected to the anhydrous calcium chloride dehydration device 5.

[0057] The anhydrous calcium chloride dehydration device 5 includes a dehydration device sewage pipeline 610 and a dehydration device outlet pipeline 611. The dehydration device sewage pipeline 610 is provided with a drain valve c303 at one end close to the anhydrous calcium chloride dehydration device 5; the dehydration device outlet pipeline 611 is divided into two branch pipelines, one branch pipeline is connected to the dehydration device vent pipeline 612, and the other branch pipeline is provided with a stop valve i708 on the dehydration device outlet pipeline 611, and is connected to the dehydration device filter pipeline 613 through the stop valve i708; the dehydration device vent pipeline 612 is divided into two branch pipelines. After installing ball valve d404 on one branch line, it is connected to the dehydration device to filter pipeline 616, and after installing ball valve e405, safety valve b502, and ball valve f406 on the other branch line in sequence, it is connected to the associated gas metering system bypass pipeline 615; the dehydration device to filter pipeline 613 is divided into two branch lines, one branch line is connected to the associated gas metering system bypass pipeline 615, and a stop valve l711 is set on the associated gas metering system bypass pipeline 615, and a stop valve j709 is installed on the other branch line, which is connected to the filter 6 through the stop valve j709.

[0058] The filter 6 is connected to the associated gas export pipeline 614, on which the gas flow meter 7 and the stop valve k710 are arranged in sequence, and the associated gas export pipeline 614 is connected to the associated gas metering system bypass pipeline 615. The drain valve a301, drain valve b302 and drain valve c303 are all automatic drain valves.

[0059] All pipelines are connected by flanges to ensure convenient connection between the gathering station network and the pipelines of this device. The overall device adopts a split design. The liquid separation area is connected with the air cooling area, pressurization area, dehydration area, and metering area by flanges. After the associated gas liquid separation piping is prefabricated in the factory, it is assembled on site for easy transportation.

[0060] Example 4

[0061] An embodiment of an integrated device for metering liquid separation of associated gas with a high gas-oil ratio of the present invention comprises a skid 1, wherein the skid 1 comprises six areas, namely, an air cooling area, a liquid separation area, a pressurizing area, a dehydration area, a metering area, and a control area. An air cooler 2 is installed in the air cooling area, a liquid separator 3 is installed in the liquid separation area, a compressor 4 is installed in the pressurizing area, an anhydrous calcium chloride dehydration device 5 is installed in the dehydration area, a filter 6 and a gas flow meter 7 are installed in sequence in the metering area, and an explosion-proof junction box 8 and a PLC cabinet 9 are installed in the control area; the air cooler 2 is connected to the liquid separator 3 through a pipeline, the liquid separator 3 is connected to the compressor 4 through a pipeline, the compressor 4 is connected to the anhydrous calcium chloride dehydration device 5 through a pipeline, the anhydrous calcium chloride dehydration device 5 is connected to the filter 6 and the gas flow meter 7 through a pipeline, the explosion-proof junction box 8 is electrically connected to the air cooler 2, the liquid separator 3, the compressor 4, the anhydrous calcium chloride dehydration device 5, and the gas flow meter 7 respectively. The inlet and outlet of the air cooler 2 are both provided with thermometers; the inlet of the flow meter 7 is provided with a thermometer.

[0062] The inlet end of the air cooler 2 is connected to the air cooler inlet pipeline 601, and the stop valve b701 is installed on the air cooler inlet pipe 601. The outlet end of the air cooler 2 is connected to the air cooler outlet pipeline 602. The stop valve c702 and the stop valve d703 are installed on the air cooler outlet pipeline 602 from upstream to downstream in sequence. The air cooler outlet pipeline 602 extends to the inlet of the liquid separator 3.

[0063] An air cooler bypass pipeline 600 is arranged between the air cooler inlet pipe 601 and the air cooler outlet pipeline 602. One end of the air cooler bypass pipeline 600 is connected to the air cooler inlet pipe 601 upstream of the stop valve b701, and the other end is connected to the air cooler outlet pipeline 602 downstream of the stop valve c702. The stop valve a700 is installed on the air cooler bypass pipeline 600.

[0064] The liquid distributor 3 includes an air cooler drain line 603, an associated gas liquid distributor hot water inlet line 604, a liquid distributor return water outlet line 605, a liquid distributor vent line 606 and a liquid distributor associated gas outlet line 607; a stop valve e704 is installed on the associated gas liquid distributor hot water inlet line 604; a stop valve f705 is installed on the liquid distributor return water outlet line 605;

[0065] The liquid distributor vent line 606 is divided into two branch lines, one of which is installed with a ball valve a401 and then connected to the associated gas metering system bypass line 615, and the other branch line is installed with a ball valve b402, a safety valve a501, and a ball valve c403 in sequence and then connected to the associated gas metering system bypass line 615; the associated gas metering system bypass line 615 is connected to the liquid distributor vent line 606, and the ball valve a401 is installed on the associated gas metering system bypass line 615; the air cooler drain line 603 is installed with a drain valve a301 and a gate valve 801 in sequence, and the position between the drain valve a301 and the gate valve 801 is connected to the dehydration device drain line 610.

[0066] A stop valve g706 is installed on the associated gas outlet pipeline 607 of the liquid separator, and the associated gas outlet pipeline 607 of the liquid separator extends to be connected to the inlet of the associated gas compressor 4.

[0067] Compressor 4 includes a compressor drain pipeline 608 and a compressor outlet pipeline 609. A drain valve b302 is installed on the compressor drain pipeline 608, and the compressor drain pipeline 608 is connected to the dehydration device drain pipeline 610; a stop valve h707 is installed on the compressor outlet pipeline 609, and the compressor outlet pipeline 609 extends to the anhydrous calcium chloride dehydration device 5.

[0068] The anhydrous calcium chloride dehydration device 5 includes a dehydration device sewage pipeline 610 and a dehydration device outlet pipeline 611. The dehydration device sewage pipeline 610 is provided with a drain valve c303 at one end close to the anhydrous calcium chloride dehydration device 5;

[0069] The outlet pipeline 611 of the dehydration device is divided into two branch pipelines, one branch pipeline is connected to the vent pipeline 612 of the dehydration device, and a stop valve i708 is arranged on the outlet pipeline 611 of the dehydration device of the other branch pipeline, and the pipeline 613 to the filter of the dehydration device is connected through the stop valve i708; the vent pipeline 612 of the dehydration device is divided into two branch pipelines, one branch pipeline is installed with a ball valve d404 and then connected to the pipeline 616 to the filter of the dehydration device, and the other branch pipeline is successively installed with a ball valve e405, a safety valve b502, and a ball valve f406 and then connected to the bypass pipeline 615 of the associated gas metering system; the pipeline 613 to the filter of the dehydration device is divided into two branch pipelines, one branch pipeline is connected to the bypass pipeline 615 of the associated gas metering system, and a stop valve l711 is arranged on the bypass pipeline 615 of the associated gas metering system, and a stop valve j709 is installed on the other branch pipeline, and the pipeline is connected to the filter 6 through the stop valve j709.

[0070] The filter 6 is connected to the associated gas export pipeline 614, on which the gas flow meter 7 and the stop valve k710 are arranged in sequence, and the associated gas export pipeline 614 is connected to the associated gas metering system bypass pipeline 615. The above drain valve a301, drain valve b302, and drain valve c303 are all automatic drain valves.

[0071] In the present embodiment, a high gas-oil ratio associated gas liquid separation and metering integrated device is used. When the associated gas enters the air cooler 2 from the air cooler inlet pipeline 601, is cooled by the air cooler 2, and the temperature of the inlet and outlet of the air cooler 2 is observed. When the outlet temperature drops to 18-22°C, the associated gas enters the liquid separator 3 from the air cooler outlet pipeline 602 for gas-liquid separation. The separated associated gas is pressurized to 0.6MPa by the compressor 4, and is dehydrated to the qualified water dew point by the compressor outlet pipeline 609 to the anhydrous calcium chloride dehydration device 5. After passing through the dehydration device to the filter pipeline 613 and the filter 6 and the gas flowmeter 7, it is transported to the downstream station. When the liquid separator 3 is depressurized, it is vented and depressurized through the liquid separator vent pipeline 606 and the safety valve a501. When the anhydrous calcium chloride dehydration device 5 is depressurized, it is vented and depressurized through the dehydration device vent pipeline 612 and the safety valve b502. The condensate oil in the liquid separator 3, compressor 4 and anhydrous calcium chloride dehydration device 5 flows through the drain pipeline. When the condensate accumulates to the set value of the automatic drain valve a301, drain valve b302 and drain valve c303, the automatic drain valve opens automatically, and the condensate flows through the dehydration device drain pipeline 610 to the dirty oil recovery system in the station.

[0072] The present invention optimizes the process flow of the associated gas system in the gathering and transportation station, and integrates, integrates and skids the main process equipment, pipelines, valves, power supply and distribution, instrumentation and other facilities such as associated gas air cooling, liquid separation, pressurization, dehydration and metering. The air cooler and venting pipeline are arranged on the north side of the skid, and the associated gas liquid separator, compressor, air cooler and metering system are arranged in a row on one side of the skid to ensure that the associated gas production process is smooth, the process is short and practical, and the main equipment is arranged on the side to facilitate the inspection and maintenance of the device.

Claims

1. A high gas-to-oil ratio station associated gas gathering device, It is characterized in that The skid (1) includes six areas, namely, an air cooling area, a liquid separation area, a pressurization area, a dehydration area, a metering area, and a control area. An air cooler (2) is installed in the air cooling area, a liquid separator (3) is installed in the liquid separation area, a compressor (4) is installed in the pressurization area, an anhydrous calcium chloride dehydration device (5) is installed in the dehydration area, a gas flow meter (6) and a gas flow meter (7) are installed in the metering area in sequence, and an explosion-proof junction box (8) and a PLC cabinet (9) are installed in the control area. The air cooler (2) is connected to the liquid separator (3) through a pipeline, and the liquid separator ( 3) the compressor (4) is connected via a pipeline, the compressor (4) is connected via a pipeline to an anhydrous calcium chloride dehydration device (5), the anhydrous calcium chloride dehydration device (5) is connected via a pipeline to a filter (6) and a gas flow meter (7), the explosion-proof junction box (8) is electrically connected to the air cooler (2), the liquid distributor (3), the compressor (4), and the anhydrous calcium chloride dehydration device (5), and the PLC cabinet (9) is electrically connected to the air cooler (2), the liquid distributor (3), the compressor (4), the anhydrous calcium chloride dehydration device (5), and the gas flow meter (7); The anhydrous calcium chloride dehydration device (5) comprises a dehydration device sewage pipeline (610) and a dehydration device outlet pipeline (611); the dehydration device outlet pipeline (611) is divided into two branch pipelines, one branch pipeline is connected to the dehydration device vent pipeline (612), and the other branch pipeline is provided with a stop valve i (708) on the dehydration device outlet pipeline (611), and is connected to the dehydration device filter pipeline (613) through the stop valve i (708); The dehydration device vent pipeline (612) is divided into two branch pipelines. A ball valve d (404) is installed on one branch pipeline and then connected to the dehydration device vent bypass pipeline (616). A ball valve e (405), a safety valve b (502), and a ball valve f (406) are installed in sequence on the other branch pipeline and then connected to the associated gas metering system bypass pipeline (615). The pipeline (613) from the dehydration device to the filter is divided into two branch pipelines, one branch pipeline is connected to the bypass pipeline (615) of the associated gas metering system, a stop valve l (711) is provided on the bypass pipeline (615) of the associated gas metering system, and the other branch pipeline is installed with a stop valve j (709) and connected to the filter (6) through the stop valve j (709).

2. A high gas-to-oil ratio station associated gas gathering device according to claim 1, It is characterized in that The inlet end of the air cooler (2) is connected to an air cooler inlet pipeline (601), a stop valve b (701) is installed on the air cooler inlet pipe (601), the outlet end of the air cooler (2) is connected to an air cooler outlet pipeline (602), a stop valve c (702) and a stop valve d (703) are installed on the air cooler outlet pipeline (602) in sequence from upstream to downstream, and the air cooler outlet pipeline (602) extends to communicate with the inlet of the liquid separator (3).

3. A high gas-to-oil ratio station associated gas gathering device according to claim 1, It is characterized in that The liquid separator (3) comprises an air cooler sewage pipeline (603), an associated gas liquid separator hot water inlet pipeline (604), a liquid separator return water discharge pipeline (605), a liquid separator vent pipeline (606) and a liquid separator associated gas outlet pipeline (607); a stop valve e (704) is installed on the associated gas liquid separator hot water inlet pipeline (604); a stop valve f (705) is installed on the liquid separator return water discharge pipeline (605); a stop valve g (706) is installed on the liquid separator associated gas outlet pipeline (607), and the liquid separator associated gas outlet pipeline (607) extends to be connected to the inlet of the associated gas compressor (4).

4. A high gas-to-oil ratio station associated gas gathering device according to claim 1, It is characterized in that The compressor (4) comprises a compressor drain pipeline (608) and a compressor outlet pipeline (609); a drain valve b (302) is installed on the compressor drain pipeline (608); the compressor drain pipeline (608) is connected to a dehydration device drain pipeline (610); a drain valve c (303) is provided at one end of the dehydration device drain pipeline (610) close to the anhydrous calcium chloride dehydration device (5); a stop valve h (707) is installed on the compressor outlet pipeline (609); and the compressor outlet pipeline (609) extends to the anhydrous calcium chloride dehydration device (5).

5. The high gas-to-oil ratio station associated gas gathering device according to claim 1, It is characterized in that The filter (6) is connected to an associated gas export pipeline (614), a gas flow meter (7) and a stop valve k (710) are sequentially arranged on the associated gas export pipeline (614), and the associated gas export pipeline (614) is connected to an associated gas metering system bypass pipeline (615).

6. A high gas-to-oil ratio station associated gas gathering device according to claim 2, It is characterized in that An air cooler bypass pipeline (600) is provided between the air cooler inlet pipe (601) and the air cooler outlet pipeline (602); one end of the air cooler bypass pipeline (600) is connected to the air cooler inlet pipe (601) upstream of the stop valve b (701), and the other end is connected to the air cooler outlet pipeline (602) downstream of the stop valve c (702); and the stop valve a (700) is installed on the air cooler bypass pipeline (600).

7. A high gas-to-oil ratio station associated gas gathering device according to claim 3, It is characterized in that The liquid distributor venting pipeline (606) is divided into two branch pipelines, one branch pipeline is installed with a ball valve a (401) and then connected to the associated gas metering system bypass pipeline (615), and the other branch pipeline is installed with a ball valve b (402), a safety valve a (501), and a ball valve c (403) in sequence and then connected to the associated gas metering system bypass pipeline (615); the associated gas metering system bypass pipeline (615) is connected to the liquid distributor venting pipeline (606), and the ball valve a (401) is installed on the associated gas metering system bypass pipeline (615).

8. The high gas-to-oil ratio station associated gas gathering device according to claim 3, It is characterized in that A drain valve a (301) and a gate valve (801) are sequentially installed on the air cooler drain pipeline (603), and a position between the drain valve a (301) and the gate valve (801) is connected to a dehydration device drain pipeline (610).

9. An application method of a high gas-oil ratio associated gas liquid separation and metering integrated device, using the above-mentioned high gas-oil ratio station associated gas gathering device, It is characterized in that Follow the steps below to implement it: The associated gas enters the air cooler (2) from the air cooler inlet pipeline (601), is cooled by the air cooler (2), and the temperature of the inlet and outlet thermometers of the air cooler (2) is inspected. When the outlet temperature drops to 18-22°C, the associated gas enters the liquid separator (3) from the air cooler outlet pipeline (602) for gas-liquid separation. The separated associated gas enters the compressor (4) through the liquid separator associated gas outlet pipeline (607) for pressurization. After the pressure is increased to 0.6 MPa, the associated gas enters the anhydrous calcium chloride dehydration device (5) through the compressor outlet pipeline (609) for dehydration. The dehydration is performed until the water dew point reaches the qualified level. After reaching the qualified level, the associated gas passes through the dehydration device to the filter pipeline (613) to the filter (6) and the gas flow meter (7) for metering, and then is transported to the downstream station, thus completing the liquid separation and metering process of the associated gas. When the pressure of the liquid separator (3) is released, the pressure is released through the liquid separator vent line (606) and the safety valve a (501), and the condensate in the liquid separator (3) flows through the air cooler drain line (603). When the condensate accumulates to the set value of the drain valve a (301), the drain valve a (301) automatically opens; The condensate in the compressor (4) flows through the compressor drain line (608), and when the condensate accumulates to the set value of the drain valve b (302), the drain valve b (302) automatically opens; When the anhydrous calcium chloride dehydration device (5) is depressurized, the dehydration device venting pipeline (612) and the safety valve b (502) are used to vent and release the pressure, and the condensate oil in the anhydrous calcium chloride dehydration device (5) flows through the dehydration device sewage pipeline (610). When the condensate accumulates to the set value of the drain valve c (303), the drain valve c (303) automatically opens; The sewage discharge systems of the liquid separator (3), the compressor (4) and the anhydrous calcium chloride dehydration device (5) are collected in a sewage discharge pipeline (610) of the dehydration device and flow to the waste oil recovery device in the station. The outlet gate valve (801) of the sewage discharge pipeline (610) of the dehydration device is in a normally open state.

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