Oil-gas separation equipment for oil exploitation

Abstract

The invention relates to the technical field of oil-gas separation, and discloses oil-gas separation equipment for oil exploitation, which comprises a tank body, the tank body is at least provided with an oil-gas inlet, a natural gas outlet and an oil discharge outlet, the oil-gas inlet and the natural gas outlet are positioned on the upper side of the tank body, the oil discharge outlet is positioned on the lower side of the tank body, and a sleeve shell is mounted on the oil-gas inlet. An oil gas inlet assembly is installed in a cavity formed by the oil gas inlet and the sleeve shell, the oil gas inlet assembly forms a curved channel in the cavity, and a water inlet pipe communicated with the inlet end of the curved channel and a water outlet pipe communicated with the outlet end of the curved channel are arranged on the outer side of the sleeve shell. According to the oil-gas inlet assembly, the curved channel formed in the cavity communicates with the water inlet pipe and the water outlet pipe, after water passes through the oil-gas inlet assembly, petroleum passing through the oil-gas inlet assembly is cooled, the solubility of cooled gas in liquid is reduced, gas such as natural gas dissolved in crude oil can be separated out, and the oil-gas separation efficiency and effect are improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas separation, in particular to an oil and gas separation device for petroleum mining. Background Art

[0002] Oil production refers to the act of digging and extracting oil from oil reserves. During the oil production process, the crude oil and associated natural gas produced by the oil well are separated.

[0003] Oil and gas separation uses the different densities and gravity of gas and liquid to separate gas and liquid. When the gas-liquid mixture enters the separator, the liquid is subject to greater gravity and moves downward, while the gas is relatively light and moves upward under pressure. During the upward movement of the gas, small droplets collide and move downward under the action of gravity into the liquid gathering area, achieving gas-liquid separation.

[0004] However, during the oil extraction process, the high-speed rotation of the drill bit underground and the friction between the drill pipe and the well wall will generate heat. Especially in the extraction of deep and ultra-deep wells, due to the long-term operation and high-load work of the drilling tools, the frictional heat generation phenomenon is more obvious, which may cause local temperature rise. In a high-temperature environment, the solubility of gas in liquid increases, which is not conducive to separating gases such as natural gas dissolved in crude oil, and cannot improve the efficiency and effect of oil and gas separation. Summary of the invention

[0005] The object of the present invention is to provide an oil-gas separation device for oil mining to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is an oil and gas separation device for oil mining, comprising a tank body, two groups of supporting legs are evenly installed at the bottom of the tank body, at least an oil and gas inlet, a natural gas outlet and an oil discharge port are arranged on the tank body, the oil and gas inlet and the natural gas outlet are located on the upper side of the tank body, the oil discharge port is located on the lower side of the tank body, a casing is installed on the oil and gas inlet, an oil and gas inlet assembly is installed in the cavity formed by the oil and gas inlet and the casing, the oil and gas inlet assembly forms a curved channel in the cavity, and a water inlet pipe connected to the inlet end of the curved channel and a water outlet pipe connected to the outlet end of the curved channel are arranged on the outer side of the casing; The filter separator is used to separate the crude oil and associated natural gas produced by the oil well. Since the oil is usually stored deep underground, the temperature will gradually increase with the increase of the depth of the formation. Generally speaking, the temperature rises by about 3°C ​​for every 100 meters of formation depth. In some deep oil reservoirs, the temperature may reach more than 100°C; in addition, during the oil production process, the high-speed rotation of the drill bit in the well and the friction between the drill pipe and the well wall will generate heat. Especially in the production of deep wells and ultra-deep wells, due to the long-term operation and high-load work of the drilling tools, the frictional heat generation phenomenon is more obvious, which may cause local temperature rise.

[0007] In a high temperature environment, oil and gas are easily volatilized, which will increase the density of the gas. Since the tank itself is in a high pressure state, the inside of the tank is in an ultra-high pressure state, which can easily shorten the life of the seal. In the present application, the oil to be separated from the oil and gas is connected to the oil and gas inlet through a pipeline, so as to be transported to the inside of the tank, and the density difference between gas and liquid is used to achieve separation under the action of gravity. The density of gas is much smaller than that of liquid. When the oil and gas mixture enters the separator, the liquid sinks to the bottom of the separator due to gravity, and the gas rises to the top, thereby achieving preliminary separation. The separated gas is discharged through the natural gas outlet, and the settled oil is discharged through the oil outlet; The oil flows downward through the oil and gas entry component. Since the curved channel formed in the cavity of the oil and gas entry component is connected to the water inlet pipe and the water outlet pipe, the water cools down the oil after passing through the oil and gas entry component. After cooling, the solubility of the gas in the liquid decreases, which helps to separate the natural gas and other gases dissolved in the crude oil, thereby improving the efficiency and effect of oil and gas separation. In addition, cooling can cause some components in the oil and gas mixture to change phase, such as from gas to liquid, which is convenient for gravity sedimentation.

[0008] Furthermore, the tank body is an integral structure formed by welding, and an inspection port is provided on the upper side of the tank body. The integral structure of the tank body reduces the joint seams, improves the overall pressure bearing capacity of the tank body, and thus improves the sealing effect in a high-pressure environment.

[0009] Furthermore, a sewage outlet is provided on the lower side of the tank body, the sewage outlet corresponds to the oil and gas inlet, the oil outlet corresponds to the natural gas outlet, and a plurality of wave-breaking plates and an overflow baffle are provided at the bottom end of the inner wall of the tank body, the wave-breaking plates and the overflow baffle are both located between the sewage outlet and the oil outlet, a plurality of the wave-breaking plates and the overflow baffle are distributed at equal intervals, and the overflow baffle is located on the side close to the oil outlet.

[0010] Furthermore, a gap is provided between the lower side of the wave-breaking plate and the inner wall of the tank body, and a slope is provided on the inner wall of the tank body, the slope is located below the wave-breaking plate, the lower end of the slope is close to the sewage outlet, and a drain outlet is provided on the lower side of the tank body, the drain outlet is close to the high end of the slope.

[0011] The wave-breaking plate is provided to reduce the surging of the falling oil to one side of the overflow baffle, so that the oil near the overflow baffle is relatively calm, which facilitates the separation of water and impurities in the oil; The slope is provided to prevent the settled impurities from moving to one side of the overflow partition. During the sewage discharge process, the flowing liquid drives the impurities on the slope to be discharged to the sewage outlet.

[0012] In addition, a liquid level detection port and a temperature detection port are provided on the outer side of the tank body, wherein at least two liquid level detection ports are provided, which are distributed up and down. Through connecting the connecting pipe, it is convenient to observe the liquid level inside the tank body; a temperature detection meter is installed on the temperature detection port.

[0013] Furthermore, the oil and gas inlet assembly includes a heat exchanger, which has a curved channel. The upper end of the heat exchanger is connected to a tube body, a connecting seat is provided in the port of the tube body, a connecting rod is installed in the connecting seat, and the other end of the connecting rod is sleeved with a trumpet-shaped shell, a spring and a nut located at the lower end of the heat exchanger, and the spring pushes the trumpet-shaped shell to fit tightly against the end of the heat exchanger.

[0014] Furthermore, the heat exchanger is a cylindrical structure, comprising an inner ring body and an outer ring body located outside the inner ring body, a plurality of annularly distributed vertical plates are provided on the outside of the inner ring body, the vertical plates pass through the outer ring body, a first annular groove is formed between the inner ring body and the outer ring body, a second annular groove is formed between the outer ring body and the inner wall of the casing and the inner wall of the oil and gas inlet, the top ends of the first annular groove and the second annular groove are separated by an annular plate body, the bottom ends of the first annular groove and the bottom ends of the second annular groove are connected to each other, the first annular groove is connected to the water inlet pipe, and the second annular groove is connected to the water outlet pipe.

[0015] A plurality of vertical plates distributed in an annular manner are sleeved with an annular seat on their outer sides, and the annular seat is installed at the connection between the sleeve shell and the oil and gas inlet.

[0016] Furthermore, the spring pushes the trumpet-shaped shell to close the bottom end of the inner ring body.

[0017] External water enters the first ring groove formed by the inner ring body and the outer ring body through the water inlet pipe, enters the second ring groove through the bottom of the first ring groove, and is discharged through the water outlet pipe connected to the top of the second ring groove, so that water flows through the entire heat exchanger to cool the heat exchanger; The heat exchanger is made of heat-conducting metal, such as copper, aluminum or iron. The oil moves downward through the inner ring, pushing the trumpet-shaped shell to squeeze the spring to achieve the inner connection between the inner ring and the tank body, so that the oil enters the tank body and diffuses outward along the surface of the trumpet-shaped shell. In addition, an outer ring body is provided outside the inner ring body to increase the contact area between the heat exchange element and water, thereby improving the heat exchange effect; A convex ring is sleeved on the inner ring body, the convex ring is connected to the outer wall of the inner ring body through a bracket, and the convex ring cooperates with the ring groove provided on the inner side surface of the sleeve shell, thereby realizing limited installation.

[0018] Furthermore, a guide plate and a plurality of gas baffles are installed on the top of the inner wall of the tank body, and the guide plate and the gas baffles are both located between the oil and gas inlet and the natural gas outlet. The guide plate is distributed corresponding to the oil and gas inlet, and a plurality of through grooves are opened on the vertical sides of the guide plate and the gas baffle.

[0019] Furthermore, a mist collector is installed inside the tank body, and the mist collector is communicated with the lower port of the natural gas outlet.

[0020] Gas baffles and mist collectors are used to separate oil droplets with a particle size of less than 100 microns that have not settled by gravity in the airflow. The oil droplets are collected in the mist collector mainly by collision and condensation, and then flow into the liquid collection area under the action of gravity, thereby improving the efficiency and purity of oil and gas separation; The mist collector can effectively prevent oil droplets from entering subsequent equipment and pipelines, avoiding oil droplets from depositing, scaling or corroding in these parts, extending the service life of the equipment and reducing maintenance costs.

[0021] The present invention has the following beneficial effects: (1) The present invention connects the oil to be separated from the oil and gas through a pipeline with the oil and gas inlet, thereby transporting it to the inside of the tank body, and uses the density difference between gas and liquid to achieve separation under the action of gravity. The density of gas is much smaller than that of liquid. When the oil and gas mixture enters the separator, the liquid sinks to the bottom of the separator due to gravity, while the gas rises to the top. The separation is achieved under the action of gravity by density, reducing the practical use of power energy and energy consumption, thereby achieving low-carbon separation of oil and gas, thereby achieving preliminary separation. The separated gas is discharged through the natural gas outlet, and the settled oil is discharged through the oil outlet; The oil flows downward through the oil and gas entry component. Since the curved channel formed in the cavity of the oil and gas entry component is connected to the water inlet pipe and the water outlet pipe, the water cools down the oil after passing through the oil and gas entry component. After cooling, the solubility of the gas in the liquid decreases, which helps to separate the natural gas and other gases dissolved in the crude oil, thereby improving the efficiency and effect of oil and gas separation. In addition, cooling can cause some components in the oil and gas mixture to change phase, such as from gas to liquid, which is convenient for gravity sedimentation.

[0022] (2) The present invention reduces the surging of the falling oil toward one side of the overflow baffle by means of the wave-breaking plate, thereby achieving a relatively calm state of the oil near the overflow baffle, thereby facilitating the separation of water and impurities in the oil; The slope is provided to prevent the settled impurities from moving to one side of the overflow partition. During the sewage discharge process, the flowing liquid drives the impurities on the slope to be discharged to the sewage outlet.

[0023] (3) The present invention uses a gas baffle and a mist collector to separate oil droplets in the airflow that have not settled due to gravity. The oil droplets are collected in the mist collector mainly by collision and condensation, and then flow into the liquid collection area under the action of gravity, thereby improving the efficiency and purity of oil and gas separation. Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the present invention as a whole; Figure 3 It is a side schematic diagram of the present invention; Figure 4 For the present invention Figure 3 AA cross-sectional diagram of ; Figure 5 This is a schematic diagram of the oil and gas inlet assembly of the present invention; Figure 6 This is a cross-sectional schematic diagram of the oil and gas inlet assembly of the present invention; Figure 7 This is a schematic diagram of the oil and gas inlet assembly of the present invention; Figure 8 It is a schematic diagram of overall height increase of the present invention; In the accompanying drawings, the components represented by the reference numerals are listed as follows: In the figure: 1. Tank; 101. Oil and gas inlet; 102. Natural gas outlet; 103. Inspection port; 104. Drain port; 105. Oil drain port; 106. Liquid level detection port; 107. Temperature detection port; 108. Slope; 109. Drain port; 2. Support legs; 3. Guide plate; 4. Wave-breaking plate; 5. Overflow baffle; 6. Gas baffle; 7. Oil and gas inlet assembly; 701. Heat exchange Parts; 7011, inner ring body; 7012, outer ring body; 7013, vertical plate; 7014, ring seat; 7015, convex ring; 7016, annular plate body; 702, tube body; 7021, connecting seat; 703, connecting rod; 704, trumpet-shaped shell; 705, spring; 706, nut; 8, casing; 801, water inlet pipe; 802, water outlet pipe; 9, mist collector; 10, filter element. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 8 As shown, the present invention is an oil and gas separation device for oil mining, comprising a tank body 1, two sets of support legs 2 are evenly installed at the bottom of the tank body 1, and a heightening block can be installed at the bottom of the support legs 2. By installing the heightening block, the installation height of the tank body 1 can be changed. The tank body 1 is provided with at least an oil and gas inlet 101, a natural gas outlet 102 and an oil discharge port 105. The inlet end of the oil discharge port 105 is plugged with a tubular filter element 10 to filter the discharged oil, and the discharged oil is extracted through the oil discharge port 105 when replaced; The oil and gas inlet 101 and the natural gas outlet 102 are located on the upper side of the tank body 1, and the oil discharge port 105 is located on the lower side of the tank body 1. A casing 8 is installed on the oil and gas inlet 101, and an oil and gas inlet assembly 7 is installed in the cavity formed by the oil and gas inlet 101 and the casing 8. The oil and gas inlet assembly 7 forms a curved channel in the cavity, and a water inlet pipe 801 connected to the inlet end of the curved channel and a water outlet pipe 802 connected to the outlet end of the curved channel are provided on the outer side of the casing 8; The filter separator is used to separate the crude oil and associated natural gas produced by the oil well. Since the oil is usually stored deep underground, the temperature will gradually increase with the increase of the depth of the formation. Generally speaking, the temperature rises by about 3°C ​​for every 100 meters of formation depth. In some deep oil reservoirs, the temperature may reach more than 100°C; in addition, during the oil production process, the high-speed rotation of the drill bit in the well and the friction between the drill pipe and the well wall will generate heat. Especially in the production of deep wells and ultra-deep wells, due to the long-term operation and high-load work of the drilling tools, the frictional heat generation phenomenon is more obvious, which may cause local temperature rise.

[0028] In a high temperature environment, the oil and gas are easily volatilized, and thus the density of the gas is increased. Since the tank body 1 is in a high pressure state, the inside of the tank body 1 is in an ultra-high pressure state, which can easily shorten the life of the seal under ultra-high pressure; In the present application, the oil to be separated from the oil and gas is connected to the oil and gas inlet 101 through a pipeline, so as to be transported to the inside of the tank 1, and the density difference between the gas and the liquid is used to achieve separation under the action of gravity. The density of the gas is much smaller than that of the liquid. When the oil and gas mixture enters the separator, the liquid sinks to the bottom of the separator due to gravity, and the gas rises to the top, thereby achieving preliminary separation. The separated gas is discharged through the natural gas outlet 102, and the settled oil is discharged through the oil outlet 105; The oil flows downward through the oil and gas entry component 7. Since the curved channel formed in the cavity of the oil and gas entry component 7 is connected with the water inlet pipe 801 and the water outlet pipe 802, the water cools down the oil after passing through the oil and gas entry component 7. After cooling, the solubility of the gas in the liquid decreases, which helps to separate the natural gas and other gases dissolved in the crude oil, thereby improving the efficiency and effect of oil and gas separation. In addition, cooling can cause some components in the oil and gas mixture to change phase, such as from gas to liquid, which is convenient for gravity sedimentation.

[0029] The tank body 1 is an integral structure formed by welding, and an inspection port 103 is provided on the upper side of the tank body 1. The integral structure of the tank body 1 reduces the joint seams, improves the overall pressure bearing capacity of the tank body 1, and thus improves the sealing effect in a high-pressure environment.

[0030] A sewage outlet 104 is provided on the lower side of the tank body 1, and the sewage outlet 104 corresponds to the oil and gas inlet 101, and the oil outlet 105 corresponds to the natural gas outlet 102. A plurality of wave-breaking plates 4 and an overflow baffle 5 are provided at the bottom end of the inner wall of the tank body 1, and the wave-breaking plates 4 and the overflow baffle 5 are both located between the sewage outlet 104 and the oil outlet 105. The plurality of wave-breaking plates 4 and the overflow baffle 5 are distributed at equal intervals, and the overflow baffle 5 is located on the side close to the oil outlet 105.

[0031] A gap is provided between the lower side of the wave-breaking plate 4 and the inner wall of the tank body 1. At the same time, a slope 108 is provided on the inner wall of the tank body 1. The slope 108 is located below the wave-breaking plate 4. The lower end of the slope 108 is close to the sewage outlet 104. A drain outlet 109 is provided on the lower side of the tank body 1. The drain outlet 109 is close to the high end of the slope 108.

[0032] The wave-breaking plate 4 is provided to reduce the surging of the falling oil toward the side of the overflow baffle 5, so that the oil near the side of the overflow baffle 5 is relatively calm, thereby facilitating the separation of water and impurities in the oil; The slope 108 is provided to prevent the settled impurities from moving to one side of the overflow partition 5 . During the sewage discharge process, the flowing liquid drives the impurities on the slope 108 to be discharged to the sewage outlet 104 .

[0033] In addition, a liquid level detection port 106 and a temperature detection port 107 are provided on the outer surface of the tank body 1, wherein at least two liquid level detection ports 106 are provided, which are distributed up and down, and are connected to the connecting pipe to facilitate observation of the liquid level inside the tank body 1; a temperature detection meter is installed on the temperature detection port 107.

[0034] The oil and gas entry component 7 includes a heat exchanger 701, which has a curved channel. The upper end of the heat exchanger 701 is connected to a tube body 702, and a connecting seat 7021 is provided in the port of the tube body 702. A connecting rod 703 is installed in the connecting seat 7021. The other end of the connecting rod 703 is sleeved with a trumpet-shaped shell 704, a spring 705 and a nut 706 located at the lower end of the heat exchanger 701. The spring 705 pushes the trumpet-shaped shell 704 to fit closely to the end of the heat exchanger 701.

[0035] The heat exchanger 701 is a cylindrical structure, and the heat exchanger 701 includes an inner ring body 7011 and an outer ring body 7012 located outside the inner ring body 7011. A plurality of annularly distributed vertical plates 7013 are provided on the outside of the inner ring body 7011. The vertical plates 7013 pass through the outer ring body 7012. A first annular groove is formed between the inner ring body 7011 and the outer ring body 7012. A second annular groove is formed between the outer ring body 7012 and the inner wall of the casing 8 and the inner wall of the oil and gas inlet 101. The tops of the first annular groove and the second annular groove are separated by an annular plate body 7016. The bottom ends of the first annular groove and the second annular groove are connected to each other. The first annular groove is connected to the water inlet pipe 801, and the second annular groove is connected to the water outlet pipe 802.

[0036] A ring seat 7014 is sleeved on the outer side of a plurality of vertical plates 7013 distributed in an annular manner. The ring seat 7014 is installed at the connection between the casing 8 and the oil and gas inlet 101.

[0037] The spring 705 pushes the trumpet-shaped housing 704 to close the bottom end of the inner ring body 7011 .

[0038] External water enters the first ring groove formed by the inner ring body 7011 and the outer ring body 7012 through the water inlet pipe 801, enters the second ring groove through the bottom of the first ring groove, and is discharged through the water outlet pipe 802 connected to the top of the second ring groove, so that water flows through the entire heat exchange element 701 to cool the heat exchange element 701; The heat exchanger 701 is made of heat-conducting metal, such as copper, aluminum or iron. The oil moves downward through the inner ring 7011, pushing the trumpet-shaped shell 704 to squeeze the spring 705 to achieve the inner connection between the inner ring 7011 and the tank 1. The oil thus enters the tank 1 and diffuses outward along the surface of the trumpet-shaped shell 704. In addition, an outer ring body 7012 is provided on the outer side of the inner ring body 7011 to increase the contact area between the heat exchange element 701 and water, thereby improving the heat exchange effect; A convex ring 7015 is sleeved on the inner ring body 7011. The convex ring 7015 is connected to the outer wall of the inner ring body 7011 through a bracket. The convex ring 7015 cooperates with the annular groove provided on the inner side surface of the sleeve shell 8 to achieve limited installation.

[0039] A guide plate 3 and a plurality of gas baffles 6 are installed at the top of the inner wall of the tank body 1. The guide plate 3 and the gas baffles 6 are both located between the oil and gas inlet 101 and the natural gas outlet 102. The guide plate 3 is distributed corresponding to the oil and gas inlet 101, and a plurality of through grooves are opened on the vertical sides of the guide plate 3 and the gas baffle 6.

[0040] A mist collector 9 is installed inside the tank body 1 , and the mist collector 9 is communicated with the lower end of the natural gas outlet 102 .

[0041] The gas baffle 6 and the mist collector 9 are used to separate the oil droplets with a particle size of less than 100 microns that have not settled by gravity in the gas flow. The oil droplets are collected in the mist collector 9 mainly by collision and condensation, and then flow into the liquid collection area under the action of gravity, thereby improving the efficiency and purity of oil and gas separation; The mist collector 9 can effectively prevent oil droplets from entering subsequent equipment and pipelines, avoiding oil droplets from depositing, scaling or corroding in these parts, thereby extending the service life of the equipment and reducing maintenance costs.

[0042] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An oil and gas separation device for oil mining, comprising a tank body (1), two sets of support legs (2) evenly mounted on the bottom of the tank body (1), the tank body (1) being provided with at least an oil and gas inlet (101), a natural gas outlet (102) and an oil discharge outlet (105), characterized in that: The oil and gas inlet (101) and the natural gas outlet (102) are located on the upper side of the tank body (1), and the oil discharge port (105) is located on the lower side of the tank body (1); A casing (8) is installed on the oil and gas inlet (101), and an oil and gas inlet assembly (7) is installed in the cavity formed by the oil and gas inlet (101) and the casing (8), and the oil and gas inlet assembly (7) forms a curved channel in the cavity; The outer side of the casing (8) is provided with a water inlet pipe (801) communicating with the inlet end of the curved channel and a water outlet pipe (802) communicating with the outlet end of the curved channel.

2. The oil-gas separation device for petroleum mining according to claim 1, characterized in that: The tank body (1) is an integrated structure formed by welding; An inspection opening (103) is provided on the upper side of the tank body (1).

3. The oil-gas separation device for petroleum mining according to claim 1, characterized in that: A sewage outlet (104) is provided on the lower side of the tank body (1), the sewage outlet (104) corresponds to the oil and gas inlet (101), and the oil outlet (105) corresponds to the natural gas outlet (102); The bottom end of the inner wall of the tank body (1) is provided with a plurality of wave-breaking plates (4) and an overflow baffle (5); The wave-breaking plate (4) and the overflow baffle (5) are both located between the sewage outlet (104) and the oil outlet (105); A plurality of the wave-breaking plates (4) and an overflow baffle (5) are distributed at equal intervals, and the overflow baffle (5) is located on a side close to the oil discharge port (105).

4. The oil-gas separation device for petroleum mining according to claim 3, characterized in that: A gap is provided between the lower side of the wave-breaking plate (4) and the inner wall of the tank body (1), and a slope (108) is provided on the inner wall of the tank body (1), and the slope (108) is located below the wave-breaking plate (4); The lower end of the slope (108) is close to the sewage outlet (104); A drainage port (109) is provided on the lower side of the tank body (1), and the drainage port (109) is close to the high end of the slope (108).

5. The oil-gas separation device for petroleum mining according to claim 1, characterized in that: The oil and gas inlet assembly (7) comprises a heat exchange element (701); The heat exchange element (701) has a curved channel; The upper end of the heat exchange element (701) is connected to a tube body (702), a connection seat (7021) is provided in the port of the tube body (702), a connecting rod (703) is installed in the connecting seat (7021), and the other end of the connecting rod (703) is sleeved with a trumpet-shaped housing (704), a spring (705) and a nut (706) located at the lower end of the heat exchange element (701); The spring (705) pushes the trumpet-shaped housing (704) to be in close contact with the end of the heat exchange element (701).

6. The oil-gas separation device for petroleum mining according to claim 5, characterized in that: The heat exchange element (701) is a cylindrical structure; The heat exchange element (701) comprises an inner ring body (7011) and an outer ring body (7012) located outside the inner ring body (7011), a plurality of annularly distributed vertical plates (7013) are provided outside the inner ring body (7011), and the vertical plates (7013) pass through the outer ring body (7012); A first annular groove is formed between the inner annular body (7011) and the outer annular body (7012), and a second annular groove is formed between the outer annular body (7012), the inner wall of the casing (8), and the inner wall of the oil and gas inlet (101); The top ends of the first annular groove and the second annular groove are separated by an annular plate (7016), and the bottom ends of the first annular groove and the second annular groove are connected to each other; The first annular groove is in communication with the water inlet pipe (801), and the second annular groove is in communication with the water outlet pipe (802).

7. The oil-gas separation device for petroleum mining according to claim 6, characterized in that: A plurality of the vertical plates (7013) distributed in an annular manner are sleeved with a ring seat (7014) on the outside, and the ring seat (7014) is installed at the connection between the sleeve shell (8) and the oil and gas inlet (101).

8. The oil-gas separation device for petroleum mining according to claim 5, characterized in that: The spring (705) pushes the trumpet-shaped housing (704) to close the bottom end of the inner ring body (7011).

9. The oil-gas separation device for petroleum mining according to claim 1, characterized in that: A guide plate (3) and a plurality of gas baffles (6) are installed at the top of the inner wall of the tank body (1), and the guide plate (3) and the gas baffles (6) are both located between the oil and gas inlet (101) and the natural gas outlet (102); The guide plate (3) is distributed corresponding to the oil and gas inlet (101); A plurality of through grooves are provided on the vertical side surfaces of the guide plate (3) and the gas baffle (6).

10. The oil-gas separation device for petroleum mining according to claim 1, characterized in that: A mist collector (9) is installed inside the tank body (1), and the mist collector (9) is in communication with a lower end of the natural gas outlet (102).

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