CN112983391B - Internal rotational flow and external network management combined type oil-gas separation device and method - Google Patents
Internal rotational flow and external network management combined type oil-gas separation device and method Download PDFInfo
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- CN112983391B CN112983391B CN202110195384.7A CN202110195384A CN112983391B CN 112983391 B CN112983391 B CN 112983391B CN 202110195384 A CN202110195384 A CN 202110195384A CN 112983391 B CN112983391 B CN 112983391B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/36—Underwater separating arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0031—Degasification of liquids by filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
- B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
- B01D19/0057—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
Abstract
The invention relates to an internal cyclone and external network management combined oil-gas separation device and a method. The centrifugal cyclone system performs cyclone separation on oil gas through a spiral ascending coil pipe in the centrifugal cyclone separation tank, and after the oil-gas mixture enters the oil unloading pool and stands still, gas enters the separation cavity through the exhaust hole and then ascends to the gas collection chamber to be collected. The net pipe type separator surrounds the outside of the centrifugal cyclone separation tank, and after the oil-gas mixture enters the separation main pipe, the gas enters the gas extraction pipe and the oil flows into the downcomer under the action of gravity. Under the combined action of the plurality of gas extraction pipes and the downcomer, the oil-gas mixture is fully separated, gas flows into the gas storage tank through the gas collecting pipe, and oil flows into the oil storage tank through the oil collecting pipe. Residual gas in the oil storage tank flows into the gas storage tank through the inter-tank gas distribution pipe, and the oil-gas separation effect is guaranteed.
Description
Technical Field
The invention belongs to the technical field of oil-gas gathering and transportation processes of oil exploitation ground engineering, and particularly relates to an internal rotational flow and external network management combined type oil-gas separation device and method.
Background
With the continuous decrease of conventional oil and gas resources explored on land, the deep sea, an area with great oil and gas development potential, is gradually valued. Particularly, since 2010, a series of major breakthroughs have been made in global deep water oil and gas exploration, and deep water oil and gas has become the most important energy source replacing field. The 21 st century is known as the oceanic century, especially for the petroleum industry. However, offshore oil and gas development has the remarkable characteristics of high risk, high cost, harsh environment and the like, and the recovery and treatment device needs to be placed on an ocean platform or ship with limited size, so that the requirements of compact structure, small occupied area and skid mounting are met. Oil-gas separation is a process flow which needs to be carried out firstly after produced fluid is lifted to a platform, and is completed by means of a separator. Currently, oil-gas separation devices can be roughly divided into three forms in terms of appearance: the oil-gas separator comprises a vertical oil-gas separator, a horizontal oil-gas separator and a spherical oil-gas separator. The vertical oil-gas separator has the problems of small gas treatment amount, poor separation effect and the like; the horizontal oil-gas separator has the problems of difficult liquid level control, large occupied area and difficult sand removal, slurry and other impurities; the spherical oil-gas separator is troublesome to manufacture, the separation space and the liquid level buffering capacity are limited, and the liquid level control requirement is strict. The three oil-gas separators have respective advantages and disadvantages, and the oil-gas separator commonly used in onshore oil fields cannot be directly applied to an offshore platform. Therefore, the device has the advantages of simple structure, small volume, light weight, high separation efficiency, large treatment capacity, safety, reliability and easy installation and maintenance, can adapt to the separation technology and the device of multi-flow type oil, gas and water, and is one of the major key and critical ocean oil and gas exploitation and treatment technologies and equipment in all countries in the world. The small, efficient and quick oil-gas-water separation equipment has important significance for offshore oil-gas fields to be built and constructed, particularly offshore oil-gas fields adopting a mixed transportation mode.
Disclosure of Invention
The invention aims to provide a simpler and more efficient internal rotational flow and external network management combined oil-gas separation device and method aiming at the problems and the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an internal cyclone and external network management combined oil-gas separation device consists of a centrifugal cyclone system, a network management type separator and a reservoir system; the centrifugal cyclone system consists of a centrifugal cyclone separation tank and a separation tank base, the centrifugal cyclone separation tank is respectively provided with an oil discharge pool, a separation cavity and an air collection chamber from bottom to top, and a spiral ascending coil is arranged in the separation cavity; the net pipe type separator comprises a separation main pipe, an air extracting pipe, an air collecting pipe, an oil collecting pipe and a downcomer; the reservoir system includes an oil storage tank, an air storage tank, and an inter-tank gas-distributing pipe.
The centrifugal cyclone separation tank is fixedly arranged on the separation tank base, an oil unloading pool and a separation cavity of the centrifugal cyclone separation tank are of cylindrical cavity structures with the upper and lower equal diameters, and the oil unloading pool and the separation cavity are welded into a whole. The top of the oil discharging pool is evenly distributed with vent holes, and the side wall of the oil discharging pool close to the bottom is provided with an oil outlet. The inside spiral rising coil that is equipped with of separation chamber above the oil unloading pond, spiral rising coil around centrifugal cyclone tank axis spiral rising, spiral rising coil's section is the raindrop shape, and sharp edge one side is towards the axis of centrifugal cyclone tank, and sharp edge side is opened there is the rectangle gap, and the gap width is 1/3 ~ 1/2 of spiral rising coil wall thickness. The upper end of the spiral rising coil pipe is an oil-gas mixture inlet, the lower end of the spiral rising coil pipe is an oil-gas mixture outlet, and the lower end outlet is communicated with the oil unloading pool. The outlet at the upper end of the spiral ascending coil is higher than the top end surface of the separation cavity and extends into the gas collection chamber above the separation cavity. The gas collection chamber is a hemispherical shell, the diameter of the gas collection chamber is equal to that of the separation cavity, and the bottom end of the gas collection chamber is fixed with the top end of the separation cavity through welding. The center of the hemispherical top of the gas collection chamber is provided with a gas outlet which is connected to the gas collection pipe. An oil-gas mixture inlet joint is arranged on the side wall of the gas collection chamber close to the bottom end, and the joint is connected with an oil-gas mixture inlet of the spiral ascending coil pipe.
The mesh pipe type separator surrounds the outer part of the centrifugal cyclone separation tank. The separation main pipe is horizontally arranged, one end of the separation main pipe is connected with an oil outlet of an oil discharge tank of the centrifugal cyclone separation tank, the length of the separation main pipe is 1-1.5 times of the perimeter of the centrifugal cyclone separation tank, and the other end of the separation main pipe is a blind end. The number of the lifting pipes and the number of the downcomers are the same and are 5-8. The gas lifting pipe and the downcomer are both vertically arranged and are parallel to the axis of the centrifugal cyclone separation tank. The bottom end of each gas extraction pipe is communicated with the top of the separation main pipe, the height of each gas extraction pipe is higher than that of the centrifugal cyclone separation tank, and the diameter of each gas extraction pipe is 0.4-0.6 times that of the separation main pipe. The top end of each downcomer is communicated with the bottom of the separation main pipe, and the diameter of each downcomer is 0.3-0.5 times of that of the separation main pipe. The connecting position of the gas lifting pipe and the separation main pipe and the connecting position of the downcomer and the separation main pipe are staggered. The gas collecting pipes are horizontally arranged and positioned at the top of the net pipe type separator, the top end of each gas lifting pipe is communicated with the bottom of the gas collecting pipe, and the gas collecting pipes are connected to the gas storage tank. The oil collecting pipe is horizontally arranged on the base of the separating tank and is positioned at the bottom of the mesh pipe type separator, the bottom end of each downcomer is communicated with the upper part of the oil collecting pipe, and the oil collecting pipe is connected to the oil storage tank.
The storage system is located on one side of the centrifugal cyclone system and the network management type separator, the gas storage tank and the oil storage tank are fixed through the support, the gas storage tank is located above the oil storage tank, and the bottom of the gas storage tank is connected with the top of the oil storage tank through the inter-tank gas distribution pipe.
The internal rotational flow and external network management combined oil-gas separation device is utilized to provide an internal rotational flow and external network management combined oil-gas separation method. The produced oil-gas mixture is connected with an oil-gas mixture inlet joint on the side wall of a gas collection chamber of the centrifugal cyclone separation tank, the oil-gas mixture flows downwards along the spiral ascending coil after entering the spiral ascending coil, part of gas flows into the separation cavity through a rectangular gap on the tip side of the spiral ascending coil under the action of centrifugal force, and then the gas floats to the top of the centrifugal cyclone separation tank to collect. The oil-gas mixture flows out from the oil-gas mixture outlet at the lower end after flowing through the spiral ascending coil pipe and enters the oil unloading pool. Because the exhaust holes are uniformly distributed at the top of the oil unloading pool, after the oil-gas mixture is stood still in the oil unloading pool, part of gas enters the separation cavity through the exhaust holes and then rises to the gas collection chamber to be collected. After separation by the centrifugal cyclone system, most of the gas in the oil-gas mixture is separated. The oil-gas mixture in the oil unloading pool flows into the mesh pipe type separator through an oil outlet at the bottom of the oil unloading pool, when the oil-gas mixture enters the separation main pipe, the flow speed is reduced, and because the gas is light, the gas enters the gas lifting pipe under the action of gravity, and the oil flows into the downcomer. Under the combined action of the plurality of gas extraction pipes and the downcomer, the oil-gas mixture is fully separated, the gas enters the gas collecting pipe and then is collected to the gas storage tank together with the gas in the gas collecting chamber of the centrifugal cyclone separation tank, and the oil enters the oil collecting pipe through the downcomer and then is collected to the oil storage tank. Because the inter-tank gas distribution pipe is communicated between the bottom of the gas storage tank and the top of the oil storage tank, the residual gas which is not separated yet can be further separated, and the oil-gas separation effect is ensured.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the device provided by the invention has the advantages that the mesh pipe type separator surrounds the outside of the centrifugal cyclone separation system, the structure is compact and simple, the space volume is small, the weight is light, the separation efficiency is high, and the device is suitable for oil-gas separation on the sea;
2. the device is formed by combining a centrifugal cyclone separation system and a network management type separator, the centrifugal cyclone separation system and the network management type separator work cooperatively, the oil-gas separation efficiency is greatly improved, real-time online oil-gas separation can be carried out, and the separation cost is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;
FIG. 2 is a schematic view of a mesh-tube separator of the apparatus of the present invention;
FIG. 3 is a schematic view of the internal structure of the centrifugal cyclone separation tank of the apparatus of the present invention;
FIG. 4 is a cross-sectional view of the spiral rising coil of the apparatus of the present invention;
wherein: 1-centrifugal cyclone separation tank; 11-oil unloading pool; 12-a separation chamber; 13-gas collection chamber; 14-spiral rising coil pipe; 2-separating tank base; 3-a mesh pipe type separator; 31-separation trunk; 32-a gas extraction pipe; 33-a gas collecting pipe; 34-an oil collecting pipe; 35-a downcomer; 4-a gas storage tank; 5-an oil storage tank; 6-inter-pot gas distribution pipe.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
An internal cyclone and external network management combined oil-gas separation device consists of a centrifugal cyclone system, a network management type separator 3 and a reservoir system; the centrifugal cyclone system consists of a centrifugal cyclone separation tank 1 and a separation tank base 2, the centrifugal cyclone separation tank 1 is respectively provided with an oil discharge pool 11, a separation cavity 12 and a gas collection chamber 13 from bottom to top, and a spiral ascending coil 14 is arranged in the separation cavity 12; the mesh pipe type separator 3 comprises a separation main pipe 31, a gas lifting pipe 32, a gas collecting pipe 33, an oil collecting pipe 34 and a downcomer 35; the reservoir system comprises an oil storage tank 5, an air storage tank 4 and an inter-tank gas-dividing pipe 6.
The centrifugal cyclone separation tank 1 is fixedly arranged on the separation tank base 2, an oil discharge tank 11 and a separation cavity 12 of the centrifugal cyclone separation tank 1 are of cylindrical cavity structures with the same diameter from top to bottom, and the oil discharge tank 11 and the separation cavity 12 are welded into a whole. Exhaust holes are uniformly distributed in the top of the oil unloading pool 11, and an oil outlet is formed in the side wall, close to the bottom, of the oil unloading pool 11. The spiral rising coil 14 is arranged in the separation cavity 12 above the oil unloading pool 11, the spiral rising coil 14 spirally rises around the axis of the centrifugal cyclone separation tank 1, the section of the spiral rising coil 14 is rain drop-shaped, one side of the sharp edge faces the axis of the centrifugal cyclone separation tank 1, a rectangular gap is formed in the side of the sharp edge, and the width of the gap is 1/3-1/2 of the wall thickness of the spiral rising coil 14. The upper end of the spiral rising coil pipe 14 is an oil-gas mixture inlet, the lower end is an oil-gas mixture outlet, and the lower end outlet is communicated with the oil unloading pool 11. The outlet at the upper end of the spiral ascending coil pipe 14 is higher than the top end surface of the separation chamber 12 and extends into the gas collection chamber 13 above the separation chamber 12. The gas collection chamber 13 is a hemispherical shell, the diameter of the gas collection chamber is equal to that of the separation cavity 12, and the bottom end of the gas collection chamber 13 and the top end of the separation cavity 12 are fixed through welding. An air outlet is arranged at the center of the hemispherical top of the air collection chamber 13 and is connected to the air collection pipe 33. An oil-gas mixture inlet joint is arranged on the side wall of the gas collection chamber 13 close to the bottom end, and the joint is connected with an oil-gas mixture inlet of the spiral ascending coil 14.
The mesh pipe type separator 3 surrounds the outside of the centrifugal cyclone separation tank 1. The separation main pipe 31 is horizontally arranged, one end of the separation main pipe 31 is connected with an oil outlet of the oil unloading pool 11 of the centrifugal cyclone separation tank 1, the length of the separation main pipe 31 is 1-1.5 times of the circumference of the centrifugal cyclone separation tank 1, and the other end of the separation main pipe 31 is a blind end. The number of the lifting pipes 32 is the same as that of the downcomers 35, and the lifting pipes are 5-8. The gas lifting pipe 32 and the downcomer 35 are both vertically arranged and are parallel to the axis of the centrifugal cyclone separating tank 1. The bottom end of each gas extraction pipe 32 is communicated with the top of the separation main pipe 31, the height of each gas extraction pipe 32 is higher than that of the centrifugal cyclone separation tank 1, and the diameter of each gas extraction pipe 32 is 0.4-0.6 times that of the separation main pipe 31. The top end of each downcomer 35 is communicated with the bottom of the separation main pipe 31, and the diameter of each downcomer 35 is 0.3-0.5 times of that of the separation main pipe 31. The connecting positions of the gas supply pipe 32 and the separation trunk 31 and the connecting positions of the downcomer 35 and the separation trunk 31 are staggered with each other. The gas collecting pipe 33 is horizontally arranged and is positioned at the top of the net pipe type separator 3, the top end of each gas lifting pipe 32 is communicated with the bottom of the gas collecting pipe 33, and the gas collecting pipe 33 is connected to the gas storage tank 4. The oil collecting pipe 34 is horizontally arranged on the separating tank base 2 and is positioned at the bottom of the mesh pipe type separator 3, the bottom end of each downcomer 35 is communicated with the upper part of the oil collecting pipe 34, and the oil collecting pipe 34 is connected to the oil storage tank 5.
The reservoir system is located 3 one sides of centrifugal cyclone system and network management formula separator, and is fixed with gas holder 4 and oil storage tank 5 through the support, and gas holder 4 is located 5 tops of oil storage tank, and 4 bottoms of gas holder and 5 tops of oil storage tank are passed through the gas-distributing pipe 6 between the jar and are linked to each other.
The internal rotational flow and external network management combined oil-gas separation device is utilized to provide an internal rotational flow and external network management combined oil-gas separation method. The produced oil-gas mixture is connected with an oil-gas mixture inlet joint on the side wall of an air collection chamber 13 of the centrifugal cyclone separation tank 1, the oil-gas mixture flows downwards along the spiral ascending coil 14 after entering the spiral ascending coil 14, part of gas flows into the separation cavity 12 through a rectangular gap on the tip side of the spiral ascending coil 14 under the action of centrifugal force, and then the gas is floated to the air collection chamber 13 at the top of the centrifugal cyclone separation tank 1 to be collected. The oil-gas mixture flows out from the outlet of the oil-gas mixture at the lower end after flowing through the spiral rising coil pipe 14 and enters the oil unloading pool 11. Because the exhaust holes are uniformly distributed on the top of the oil unloading pool 11, after the oil-gas mixture stands still in the oil unloading pool 11, part of gas enters the separation cavity 12 through the exhaust holes and then rises to the gas collection chamber 13 to be collected. After separation by the centrifugal cyclone system, most of the gas in the oil-gas mixture is separated. The oil-gas mixture in the oil unloading pool 11 flows into the mesh pipe type separator 3 through an oil outlet at the bottom of the oil unloading pool 11, when the oil-gas mixture enters the separation main pipe 31, the flow speed is reduced, and because the gas is light, the gas enters the gas lifting pipe 32 and the oil flows into the downcomer 35 under the action of gravity. Under the combined action of the plurality of gas extraction pipes 32 and the downcomer 35, the oil-gas mixture is fully separated, the gas enters the gas collecting pipe 33 and then is collected together with the gas in the gas collecting chamber 13 of the centrifugal cyclone separation tank 1 to the gas storage tank 4, and the oil enters the oil collecting pipe 34 through the downcomer 35 and then is collected to the oil storage tank 5. Because the bottom of the gas storage tank 4 and the top of the oil storage tank 5 are communicated with the inter-tank gas distribution pipe 6, the residual gas which is not separated yet can be further separated, and the oil-gas separation effect is ensured.
Example (b):
when the device is installed, a separating tank base 2 is installed firstly, and a centrifugal cyclone separating tank 1 and a mesh pipe type separator 3 are installed on the separating tank base 2.
The oil unloading pool 11 is arranged at the center of the top surface of the separating tank base 2. Then, installing a spiral ascending coil 14, wherein an oil-gas mixture outlet of the spiral ascending coil 14 is communicated with the oil unloading pool 11; then a separation cavity 12 is installed, and the bottom of the separation cavity 12 is connected with the top of the oil unloading pool 11 in a welding mode; then, an air collection chamber 13 is installed, and one end inside an oil-gas mixture inlet joint on the side surface of the air collection chamber 13 is connected with an oil-gas mixture inlet of the spiral ascending coil 14; the bottom of the gas collection chamber 13 is connected with the top of the separation chamber 12 by welding.
And then, one end of a separation main pipe 31 of the mesh-pipe type separator 3 is connected with an oil outlet at the bottom end of the oil discharge pool 11, so that the concave surface of the separation main pipe 31 faces the centrifugal cyclone separation tank 1. Then, the gas lifting pipe 32 and the downcomer 35 are respectively installed on the top and the bottom of the separation main pipe 31 in a staggered manner. Then, a gas collecting pipe 33 and a gas collecting pipe 34 are installed at the top and bottom ends of the mesh-tube type separator 3, respectively. And the top air outlet of the air collection chamber 13 of the centrifugal cyclone separation tank 1 is connected with the air collection pipe 33. The gas collecting pipe 33 is connected to the gas tank 4, and the oil collecting pipe 34 is connected to the oil storage tank 5. Finally, an inter-tank gas-distributing pipe 6 is installed between the gas storage tank 4 and the oil storage tank 5.
After the device is installed on the ocean platform. The produced oil-gas mixture is connected with an oil-gas mixture inlet joint on the side wall of an air collection chamber 13 of the centrifugal cyclone separation tank 1, the oil-gas mixture flows downwards along the spiral ascending coil 14 after entering the spiral ascending coil 14, part of gas flows into the separation cavity 12 through a rectangular gap on the tip side of the spiral ascending coil 14 under the action of centrifugal force, and then the gas is floated to the air collection chamber 13 at the top of the centrifugal cyclone separation tank 1 to be collected. The oil-gas mixture flows out from the outlet of the oil-gas mixture at the lower end after flowing through the spiral rising coil pipe 14 and enters the oil unloading pool 11. Because the exhaust holes are uniformly distributed on the top of the oil unloading pool 11, after the oil-gas mixture stands still in the oil unloading pool 11, part of gas enters the separation cavity 12 through the exhaust holes and then rises to the gas collection chamber 13 to be collected. After separation by the centrifugal cyclone system, most of the gas in the oil-gas mixture is separated. The oil-gas mixture in the oil unloading pool 11 flows into the mesh pipe type separator 3 through an oil outlet at the bottom of the oil unloading pool 11, when the oil-gas mixture enters the separation main pipe 31, the flow speed is reduced, and because the gas is light, the gas enters the gas lifting pipe 32 and the oil flows into the downcomer 35 under the action of gravity. Under the combined action of the plurality of gas extraction pipes 32 and the downcomer 35, the oil-gas mixture is fully separated, the gas enters the gas collecting pipe 33 and then is collected together with the gas in the gas collecting chamber 13 of the centrifugal cyclone separation tank 1 to the gas storage tank 4, and the oil enters the oil collecting pipe 34 through the downcomer 35 and then is collected to the oil storage tank 5. Because the bottom of the gas storage tank 4 and the top of the oil storage tank 5 are communicated with the inter-tank gas distribution pipe 6, the residual gas which is not separated yet can be further separated, and the oil-gas separation effect is ensured.
Claims (3)
1. An internal cyclone and external network management combined oil-gas separation device consists of a centrifugal cyclone system, a network management type separator (3) and a reservoir system; the centrifugal cyclone system consists of a centrifugal cyclone separation tank (1) and a separation tank base (2), the centrifugal cyclone separation tank (1) is respectively provided with an oil unloading pool (11), a separation cavity (12) and a gas collecting chamber (13) from bottom to top, and a spiral ascending coil (14) is arranged in the separation cavity (12); the mesh pipe type separator (3) comprises a separation main pipe (31), an air lifting pipe (32), an air collecting pipe (33), an oil collecting pipe (34) and a downcomer (35); the storage system comprises an oil storage tank (5), an air storage tank (4) and an inter-tank air distribution pipe (6); the centrifugal cyclone separation tank (1) is fixedly arranged on the separation tank base (2), an oil discharge pool (11) and a separation cavity (12) of the centrifugal cyclone separation tank (1) are of a cylindrical cavity structure with the upper diameter and the lower diameter being equal, and the oil discharge pool (11) and the separation cavity (12) are welded into a whole; exhaust holes are uniformly distributed at the top of the oil unloading pool (11), and an oil outlet is formed in the side wall, close to the bottom, of the oil unloading pool (11); a spiral ascending coil pipe (14) is arranged in the separation cavity (12) above the oil unloading pool (11), and the spiral ascending coil pipe (14) spirally ascends around the axis of the centrifugal cyclone separation tank (1); the upper end of the spiral ascending coil pipe (14) is provided with an oil-gas mixture inlet, the lower end of the spiral ascending coil pipe is provided with an oil-gas mixture outlet, and the lower end outlet is communicated with the oil unloading pool (11); an outlet at the upper end of the spiral ascending coil pipe (14) is higher than the top end surface of the separation cavity (12) and extends into the gas collection chamber (13) above the separation cavity (12); the gas collection chamber (13) is a hemispherical shell, the diameter of the gas collection chamber is equal to that of the separation cavity (12), and the bottom end of the gas collection chamber (13) is fixed with the top end of the separation cavity (12) through welding; an air outlet is arranged at the center of the hemispherical top of the air collection chamber (13) and is connected to the air collection pipe (33); an oil-gas mixture inlet joint is arranged on the side wall of the gas collection chamber (13) close to the bottom end and is connected with an oil-gas mixture inlet of the spiral ascending coil pipe (14); a separation main pipe (31) of the mesh pipe type separator (3) is horizontally arranged, one end of the separation main pipe (31) is connected with an oil outlet of an oil discharge pool (11) of the centrifugal cyclone separation tank (1), and the other end of the separation main pipe (31) is a blind end; the number of the lifting pipes (32) and the number of the downcomers (35) are the same; the gas extraction pipe (32) and the downcomer (35) are both vertically arranged and are parallel to the axis of the centrifugal cyclone separation tank (1); the bottom end of each gas extraction pipe (32) is communicated with the top of the separation main pipe (31), and the height of the gas extraction pipe (32) is higher than that of the centrifugal cyclone separation tank (1); the top end of each downcomer (35) is communicated with the bottom of the separation main pipe (31); the connecting position of the gas lifting pipe (32) and the separation main pipe (31) and the connecting position of the downcomer (35) and the separation main pipe (31) are staggered; the gas collecting pipes (33) are horizontally arranged and are positioned at the top of the net pipe type separator (3), the top end of each gas extracting pipe (32) is communicated with the bottom of the gas collecting pipe (33), and the gas collecting pipes (33) are connected to the gas storage tank (4); the oil collecting pipe (34) is horizontally arranged on the separating tank base (2) and is positioned at the bottom of the mesh pipe type separator (3), the bottom end of each downcomer (35) is communicated with the upper part of the oil collecting pipe (34), and the oil collecting pipe (34) is connected to the oil storage tank (5); the storage system is positioned on one side of the centrifugal cyclone system and the network management type separator (3), the gas storage tank (4) and the oil storage tank (5) are fixed through a support, and the gas storage tank (4) is positioned above the oil storage tank (5); the method is characterized in that: the section of the spiral ascending coil pipe (14) is in a raindrop shape, one side of the sharp edge faces to the axis of the centrifugal cyclone separation tank (1), and a rectangular gap is formed in the side of the sharp edge; the mesh pipe type separator (3) surrounds the outside of the centrifugal cyclone separation tank (1); the bottom of the gas storage tank (4) is connected with the top of the oil storage tank (5) through an inter-tank gas distribution pipe (6).
2. The internal swirl and external mesh tube composite oil-gas separation device of claim 1, wherein: the width of the rectangular gap at the sharp edge side of the spiral ascending coil pipe (14) is 1/3-1/2 of the wall thickness of the spiral ascending coil pipe (14); the length of the separation main pipe (31) is 1-1.5 times of the perimeter of the centrifugal cyclone separation tank (1); the number of the gas extraction pipes (32) and the number of the downcomers (35) are respectively 5-8, the diameter of each gas extraction pipe (32) is 0.4-0.6 times of the diameter of each separation main pipe (31), and the diameter of each downcomer (35) is 0.3-0.5 times of the diameter of each separation main pipe (31).
3. An internal cyclone and external mesh pipe combined type oil-gas separation method, which adopts the internal cyclone and external mesh pipe combined type oil-gas separation device as claimed in claim 1, and is characterized in that: the produced oil-gas mixture is connected with an oil-gas mixture inlet joint on the side wall of an air collection chamber (13) of the centrifugal cyclone separation tank (1), the oil-gas mixture flows downwards along the spiral ascending coil (14) after entering the spiral ascending coil (14), under the action of centrifugal force, part of gas flows into a separation cavity (12) through a rectangular gap on the sharp edge side of the spiral ascending coil (14), and then floats to the air collection chamber (13) at the top of the centrifugal cyclone separation tank (1) to be collected; the oil-gas mixture flows out from an oil-gas mixture outlet at the lower end after flowing through the spiral ascending coil (14) and enters the oil unloading pool (11); because the exhaust holes are uniformly distributed on the top of the oil unloading pool (11), after the oil-gas mixture is stood in the oil unloading pool (11), part of gas enters the separation cavity (12) through the exhaust holes and then rises to the gas collection chamber (13) to be collected; after separation by the centrifugal cyclone system, most of gas in the oil-gas mixture is separated; the oil-gas mixture in the oil unloading pool (11) flows into the mesh pipe type separator (3) through an oil outlet at the bottom of the oil unloading pool (11), when the oil-gas mixture enters the separation main pipe (31), the flow speed is reduced, and because the gas is light, the gas enters the gas lifting pipe (32) under the action of gravity and the oil flows into the downcomer (35); under the combined action of a plurality of gas extraction pipes (32) and a downcomer (35), oil-gas mixture is fully separated, gas enters a gas collecting pipe (33) and then is collected to a gas storage tank (4) together with gas in a gas collecting chamber (13) of a centrifugal cyclone separation tank (1), and oil enters an oil collecting pipe (34) through the downcomer (35) and then is collected to an oil storage tank (5); because the bottom of the gas storage tank (4) and the top of the oil storage tank (5) are communicated with the inter-tank gas distribution pipe (6), the residual gas which is not separated can be further separated, and the oil-gas separation effect is ensured.
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