Oil and gas separation device, core displacement experiment system and oil and gas phase state experiment system

Abstract

The application provides an oil-gas separation device, a core displacement experiment system and an oil-gas phase state experiment system, and relates to the technical field of oil-gas exploitation. The oil-gas separation device comprises a buffer structure, a bottle body, a sealing element and a fluid introduction pipe. The bottle body and the buffer structure are used to construct an oil-gas separation cavity with variable volume. The bottle body has an inlet and a gas outlet, and the inlet and the gas outlet are both communicated with the oil-gas separation cavity. The sealing element is arranged at the inlet, and the sealing element is fixed with the bottle body and is in sealed connection. The fluid introduction pipe is arranged through the sealing element. One end of the fluid introduction pipe is located in the bottle body and is communicated with the oil-gas separation cavity, and the other end of the fluid introduction pipe is located outside the bottle body and is used to be communicated with the outlet of a core holder of the core displacement experiment system or the outlet of an oil-gas phase state experiment assembly of the oil-gas phase state experiment system. The buffer structure is used to adjust the volume of the oil-gas separation cavity according to the pressure in the oil-gas separation cavity. In this way, the safety of the oil-gas separation device during use is improved.

Description

Technical Field

[0001] This application relates to the field of oil and gas extraction technology, and in particular to an oil and gas separation device, a core displacement experimental system, and an oil and gas phase experimental system. Background Technology

[0002] In oil and gas extraction, the products extracted from oil wells are complex in composition, often containing gases, oils, water, and solid particles. Separating these products is a crucial step in oil and gas storage, transportation, and application. Gas-driven oil recovery (GWR) technology is a technique that promotes rapid production of oil and natural gas. GWR core displacement experiments can be used to analyze displacement efficiency, fluid flow characteristics, and multiphase flow patterns during oil and gas production, providing accurate data for improving the recovery rate of GWR technology. Oil-gas phase phase experiments, also known as pressure-volume-temperature (PVT) experiments, are used to study the phase behavior of oil-gas mixtures under different pressure, volume, and temperature conditions. This helps determine optimal surface separation conditions and provides experimental evidence for calculating the producing gas-oil ratio (GOR) of reservoir fluids, measuring surface physical parameters (such as crude oil shrinkage rate), dissolved gas-oil ratio (Rs), crude oil API gravity, and gas specific gravity. Both GWR core displacement experiments and oil-gas phase phase experiments require oil-gas separation devices for separation.

[0003] In related technologies, oil-gas separation devices include a bottle body, a sealing element, and a fluid inlet pipe. The bottle body contains an oil-gas separation chamber, with an inlet connected to this chamber. The sealing element is located at the inlet, fixed to the bottle body, and provides a sealed connection. The fluid inlet pipe passes through the sealing element and communicates with the oil-gas separation chamber, guiding fluid into the chamber. In gas-driven oil core displacement experiments, the introduced fluid is separated into oil and gas through the oil-gas separation chamber to measure the volumes of produced oil and gas. In PVT experiments, the oil-gas separation device can simulate a surface production process. The separation chamber allows for the study of fluid separation behavior under specific pressure and temperature conditions, and the measurement of the separated oil and gas volumes.

[0004] However, in the oil-gas separation devices of related technologies, problems such as seals breaking open from the inlet and bottle rupture are prone to occur during oil-gas separation, and the safety of oil-gas separation devices still needs to be improved. Summary of the Invention

[0005] This application provides an oil-gas separation device, a core displacement experimental system, and an oil-gas phase experimental system to address the shortcomings of related technologies.

[0006] In a first aspect, this application provides an oil-gas separation device, which includes a buffer structure, a bottle body, a sealing element, and a fluid inlet pipe. The bottle body and the buffer structure are used to construct an oil-gas separation chamber with a variable volume. The bottle body has an inlet and an outlet, both of which are connected to the oil-gas separation chamber. The sealing element is located at the inlet and is fixed to the bottle body for a sealed connection. The fluid inlet pipe passes through the sealing element, with one end of the fluid inlet pipe located inside the bottle body and connected to the oil-gas separation chamber, and the other end of the fluid inlet pipe located outside the bottle body and used to connect to the outlet of the core holder of a core displacement experimental system or the outlet of an oil-gas phase experimental component of an oil-gas phase experimental system.

[0007] The buffer structure is used to increase the volume of the oil-gas separation chamber when the pressure in the oil-gas separation chamber is greater than the first preset value, until the pressure in the oil-gas separation chamber drops to the first preset value or the volume of the oil-gas separation chamber reaches the maximum set value.

[0008] The buffer structure is also used to reduce the volume of the oil-gas separation chamber when the pressure in the oil-gas separation chamber is less than the first preset value, until the pressure in the oil-gas separation chamber reaches the first preset value or the volume of the oil-gas separation chamber reaches the minimum set value.

[0009] The oil-gas separation device provided in this application embodiment has a buffer structure that can buffer the high-pressure gas suddenly supplied to the oil-gas separation chamber. By increasing the volume of the oil-gas separation chamber, the pressure inside the chamber is reduced, thereby mitigating the impact of the suddenly supplied high-pressure gas on the bottle and seals. This makes it less likely for the seals to burst open from the inlet and the bottle to shatter, thus improving the safety of the oil-gas separation device. Furthermore, because the seals are less likely to burst open from the inlet, gas leakage from the oil-gas separation chamber is less likely, facilitating accurate measurement of the separated gas. Additionally, by increasing the volume of the oil-gas separation chamber, the pressure inside the chamber is reduced, preventing excessive pressure. This allows for the supply of a higher-pressure fluid to the fluid inlet pipe, reducing limitations on the experiment. The oil-gas separation device provided in this application embodiment is suitable for experiments with large sample volumes and long experimental times.

[0010] In some examples, the oil-gas separator also includes a gas flow meter for detecting the gas flowing out of the outlet. For example, the gas flow meter can be used to measure the volume, composition, etc., of the gas flowing out of the outlet.

[0011] In one possible implementation, the buffer structure includes a buoyancy buffer tank. The bottle body is disposed within the buoyancy buffer tank, and the bottom of the bottle body has a first connecting port that connects the inner cavity of the bottle body with the inner cavity of the buoyancy buffer tank.

[0012] The inner cavity of the buoyancy buffer tank is used to contain liquid, and the first connecting port is used to be immersed in the liquid. The liquid can flow between the inner cavity of the buoyancy buffer tank and the inner cavity of the bottle through the first connecting port.

[0013] The oil-gas separation chamber includes a first sub-chamber formed by the inner wall of the bottle and the liquid surface of the portion of the liquid located inside the bottle. The bottle can float up and down between the highest and lowest set heights within the buoyancy buffer tank to adjust the volume of the first sub-chamber.

[0014] The buoyancy buffer tank and the liquid are used to make the bottle float relative to the buoyancy buffer tank when the pressure in the first sub-cavity is greater than the first preset value, so as to increase the volume of the first sub-cavity until the pressure in the first sub-cavity drops to the first preset value or the bottle floats to the highest set height.

[0015] The buoyancy buffer tank and the liquid are also used to lower the bottle relative to the buoyancy buffer tank when the pressure in the first sub-cavity is less than the first preset value, so as to reduce the volume of the first sub-cavity until the pressure in the first sub-cavity reaches the first preset value or the bottle drops to the lowest set height.

[0016] In one possible implementation, a limiting frame is provided in the buoyancy buffer tank. The limiting frame is used to abut against the bottle when the bottle floats to the highest set height, so as to limit the height of the bottle's float.

[0017] In one possible implementation, a stabilizing component is provided at the bottom of the bottle to improve the stability of the bottle's floating.

[0018] In one possible implementation, the buffer structure further includes an airbag, and the oil-gas separation chamber includes a second sub-cavity formed by the inner wall of the airbag.

[0019] The bottle has a second connecting port located above the liquid surface. The air bladder is sealed to the bottle, and the second sub-cavity is connected to the inner cavity of the bottle through the second connecting port.

[0020] The airbag is used to inflate when the pressure in the first sub-cavity is greater than a second preset value and the pressure in the first sub-cavity is greater than the pressure in the second sub-cavity, so as to increase the volume of the second sub-cavity until the pressure in the second sub-cavity is equal to the pressure in the first sub-cavity.

[0021] The airbag is also used to contract when the pressure in the first sub-cavity is less than the pressure in the second sub-cavity, so as to reduce the volume of the second sub-cavity until the pressure in the second sub-cavity is equal to the pressure in the first sub-cavity.

[0022] The second preset value is greater than the first preset value.

[0023] In one possible implementation, a control valve is provided at the second connection port. The airbag is connected to the second connection port through the control valve. The control valve is used to open when the pressure in the first sub-cavity is greater than a second preset value and when the pressure in the first sub-cavity is less than the pressure in the second sub-cavity, so as to connect the first sub-cavity and the second sub-cavity.

[0024] In one possible implementation, the bottle body has a pressure relief port, and an explosion-proof valve is provided at the pressure relief port. The explosion-proof valve is used to open when the pressure in the first sub-cavity is greater than a third preset value, so that the first sub-cavity is connected to the space outside the bottle body through the pressure relief port, wherein the third preset value is greater than a second preset value.

[0025] In one possible implementation, the oil-gas separator further includes a cooling device. The cooling device is located in a buoyancy buffer tank and is used to cool the liquid to keep its temperature within a preset range.

[0026] In one possible implementation, the oil-gas separation device further includes a first oil storage container and a second oil storage container.

[0027] The first oil storage container and the second oil storage container are both located inside the first sub-cavity. The top of the first oil storage container and the top of the second oil storage container both have an open structure. The first oil storage container is fitted inside the second oil storage container, and an annular space for oil storage is formed between the second oil storage container and the first oil storage container.

[0028] One end of the fluid inlet pipe is located inside the bottle and is located inside the first oil storage container. The first oil storage container is used to receive the oil flowing out from the end of the fluid inlet pipe located inside the bottle. There is a gas flow channel between the fluid inlet pipe, the first oil storage container, and the second oil storage container, which connects the end of the fluid inlet pipe located inside the bottle to the gas outlet.

[0029] In one possible implementation, the oil-gas separation device also includes a third oil storage container and an oil guide pipe.

[0030] The third oil storage container is located outside the bottle body, and the oil guide pipe passes through the bottle body. The lower end of the oil guide pipe is located outside the bottle body and is connected to the third oil storage container, while the upper end of the oil guide pipe is located inside the bottle body and is connected to the second oil storage container.

[0031] Secondly, this application provides a core displacement test system, which includes a fluid injection device, a core holder, and an oil-gas separation device as described in any of the above embodiments.

[0032] The output end of the fluid injection device is connected to the inlet of the core holder, and the outlet of the core holder is connected to the end of the fluid inlet pipe of the oil-gas separator located outside the cylinder of the oil-gas separator.

[0033] Thirdly, this application provides an oil and gas phase state experimental system, which includes an oil and gas phase state experimental component and an oil and gas separation device in any of the above embodiments.

[0034] The outlet of the oil-gas phase experimental component is connected to the fluid inlet pipe of the oil-gas separation device at one end of the body of the oil-gas separation device. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0036] Figure 1 This is a schematic diagram of an oil-gas separation device provided in an embodiment of this application;

[0037] Figure 2 A schematic diagram of a core displacement experimental system provided in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of an oil and gas phase experimental system provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10. Oil-gas separation unit;

[0041] 20. Core holder;

[0042] 30. Fluid injection device; 31. First injection component; 32. Second injection component; 33. Injection pump;

[0043] 40. Oil-gas phase experimental assembly; 41. Autoclave; 42. Constant temperature chamber; 43. High-pressure viscometer; 43a. Capillary tube; 43b. Differential pressure sensor; 44. Connecting pipe; 45. Pressure sensor; 46. Second back pressure valve;

[0044] 51. First pressure gauge; 52. Second pressure gauge; 53. First back pressure valve;

[0045] 100. Buffer structure; 110. Buoyancy buffer tank; 111. Level gauge; 112. Limiting frame; 120. Airbag; 130. Control valve;

[0046] 200. Bottle body; 210. Sealing element; 220. Stabilizing component; 230. Explosion-proof valve;

[0047] 310. Fluid inlet pipe; 320. Oil guide pipe; 330. Air outlet pipe; 340. Connecting pipe;

[0048] 400. Cooling device;

[0049] 510. First oil storage container; 520. Second oil storage container; 530. Third oil storage container;

[0050] 600. Gas meter;

[0051] C. Oil-gas separation chamber; C1. First sub-chamber; C2. Second sub-chamber;

[0052] H1, Inlet; H2, Outlet; H3, First Connecting Port; H4, Second Connecting Port; H5, Pressure Relief Port;

[0053] L, liquid; S, annular space; T, gas flow channel. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0058] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0059] As described in the background section, both gas-driven oil core displacement experiments and oil-gas phase experiments require the use of oil-gas separation devices for oil-gas separation. In other words, both the core displacement experiment system used for gas-driven oil core displacement experiments and the oil-gas phase experiment system used for oil-gas phase experiments include oil-gas separation devices.

[0060] In related technologies, an oil-gas separation device includes a bottle body, a sealing element, and a fluid inlet pipe. The bottle body has an oil-gas separation chamber with a constant volume. The bottle body has an inlet that communicates with the oil-gas separation chamber. The sealing element is located at the inlet and is fixed to the bottle body and sealed. The fluid inlet pipe passes through the sealing element and communicates with the oil-gas separation chamber. The fluid inlet pipe is used to introduce fluid into the oil-gas separation chamber.

[0061] In gas-driven oil core displacement experiments and PVT experiments, the oil and gas produced by the components at the front end of the oil-gas separator are unstable, often exhibiting a "slug flow" of alternating gas and oil phases. In other words, the fluid flowing into the oil-gas separation chamber is frequently a "slug flow" of alternating gas and oil phases. The components at the front end of the oil-gas separator often suddenly produce a high-pressure gas phase, causing the gas in the oil-gas separation chamber to expand rapidly within a short period, resulting in a momentary "explosion" effect.

[0062] In related technologies, because the volume of the oil-gas separation chamber is constant, a rapid expansion of the gas within the chamber in a short period can cause a sharp increase in pressure, leading to problems such as seals bursting at the inlet and the bottle rupturing, resulting in poor safety of the oil-gas separation device. Furthermore, if the seals burst at the inlet, gas will leak from the chamber, affecting the accuracy of the separated gas measurements. Additionally, in some related technologies, to prevent excessive pressure within the oil-gas separation chamber, the pressure of the fluid supplied to the inlet pipe is often kept low. However, low fluid pressure limits the experiment; in this case, the oil-gas separation device is only suitable for small-scale experiments with small sample volumes and short durations, and not for experiments with large sample volumes and long experimental times (such as long core physical simulation experiments).

[0063] Figure 1 This is a schematic diagram of an oil-gas separation device provided in an embodiment of this application.

[0064] like Figure 1 As shown, based on this, this application embodiment provides an oil-gas separation device 10, which includes a buffer structure 100, a bottle body 200, a sealing element 210, and a fluid inlet pipe 310. The bottle body 200 and the buffer structure 100 are used to construct an oil-gas separation chamber C with a variable volume. The bottle body 200 has an inlet H1 and an outlet H2, both of which are connected to the oil-gas separation chamber C. The outlet H2 is used to allow gas in the oil-gas separation chamber C to flow out of the oil-gas separation chamber C. The sealing element 210 is located at the inlet H1 and is fixed to the bottle body 200 and sealed. The fluid inlet pipe 310 passes through the sealing element 210. One end of the fluid inlet pipe 310 is located inside the bottle body 200 and is connected to the oil-gas separation chamber C. The other end of the fluid inlet pipe 310 is located outside the bottle body 200 and is used to connect with the core holder 20 of the core displacement experimental system (as follows). Figure 2 The oil and gas phase experimental component 40 of the oil and gas phase experimental system shown below is the outlet or oil and gas phase experimental system. Figure 3 The fluid inlet pipe 310 is connected to the outlet of the core holder 20 or the oil-gas phase experimental assembly 40, and is used to introduce the fluid flowing from the outlet of the core holder 20 or the outlet of the oil-gas phase experimental assembly 40 into the oil-gas separation chamber C. The seal 210 is used to seal the fluid inlet pipe 310 to the bottle body 200, so that the gas in the oil-gas separation chamber C is not easy to leak from the fluid inlet pipe 310 to the bottle body 200.

[0065] The buffer structure 100 is used to increase the volume of the oil-gas separation chamber C when the pressure in the oil-gas separation chamber C is greater than the first preset value, until the pressure in the oil-gas separation chamber C drops to the first preset value or the volume of the oil-gas separation chamber C reaches the maximum set value.

[0066] The buffer structure 100 is also used to reduce the volume of the oil-gas separation chamber C when the pressure in the oil-gas separation chamber C is less than the first preset value, until the pressure in the oil-gas separation chamber C reaches the first preset value or the volume of the oil-gas separation chamber C reaches the minimum set value.

[0067] Thus, the buffer structure 100 can buffer the high-pressure gas suddenly supplied to the oil-gas separation chamber C. By increasing the volume of the oil-gas separation chamber C, the pressure inside the chamber C is reduced, thereby mitigating the impact of the suddenly supplied high-pressure gas on the bottle body 200 and the seal 210. This makes it less likely for the seal 210 to burst open from the inlet H1 and for the bottle body 200 to rupture, thus improving the safety of the oil-gas separation device 10. Furthermore, since the seal 210 is less likely to burst open from the inlet H1, gas leakage from the oil-gas separation chamber C is less likely, facilitating accurate measurement of the separated gas. Additionally, by increasing the volume of the oil-gas separation chamber C, the pressure inside the chamber C is reduced, preventing excessive pressure. At this point, a higher-pressure fluid can be supplied to the fluid inlet pipe 310, reducing limitations on the experiment. The oil-gas separation device 10 provided in this embodiment is suitable for experiments with large sample volumes and long experimental times (e.g., long core physical simulation experiments).

[0068] For example, the volume of bottle 200 can be 400ml and the height can be 30cm.

[0069] For example, the bottle body 200 can be made of high-pressure resistant borosilicate glass, which facilitates observation inside the bottle body 200, making it easier to observe the measurement data of the components inside the bottle body 200, and at a lower cost.

[0070] In some examples, the oil-gas separator 10 also includes a gas flow meter 600 for detecting the gas flowing out of the outlet H2. Exemplarily, the gas flow meter 600 can be used to measure the volume, composition, etc., of the gas flowing out of the outlet H2.

[0071] For example, the oil-gas separation device 10 also includes an outlet pipe 330, one end of which is connected to the bottle body 200 at the outlet H2, and a gas meter 600 is located at the other end of the outlet pipe 330, making the installation of the gas meter 600 more convenient.

[0072] In one possible implementation, the buffer structure 100 includes a buoyancy buffer tank 110. A bottle body 200 is disposed within the buoyancy buffer tank 110, and the bottom of the bottle body 200 has a first connecting port H3, which connects the inner cavity of the bottle body 200 to the inner cavity of the buoyancy buffer tank 110. The inner cavity of the buoyancy buffer tank 110 is used to contain liquid L, and the first connecting port H3 is used to immerse the liquid L. The liquid L can flow between the inner cavity of the buoyancy buffer tank 110 and the inner cavity of the bottle body 200 through the first connecting port H3.

[0073] The oil-gas separation chamber C includes a first sub-chamber C1 formed by the inner wall of the bottle body 200 and the liquid surface of the portion of the liquid L located inside the bottle body 200. The bottle body 200 can float up and down between the highest set height and the lowest set height within the buoyancy buffer tank 110 to adjust the volume of the first sub-chamber C1.

[0074] The buoyancy buffer tank 110 and the liquid L are used to make the bottle 200 float relative to the buoyancy buffer tank 110 when the pressure in the first sub-cavity C1 is greater than the first preset value, so as to increase the volume of the first sub-cavity C1 until the pressure in the first sub-cavity C1 drops to the first preset value or the bottle 200 floats to the highest set height.

[0075] The buoyancy buffer tank 110 and the liquid L are also used to cause the bottle body 200 to descend relative to the buoyancy buffer tank 110 when the pressure in the first sub-cavity C1 is less than the first preset value, so as to reduce the volume of the first sub-cavity C1 until the pressure in the first sub-cavity C1 reaches the first preset value or the bottle body 200 descends to the lowest set height.

[0076] In this way, the volume of the first sub-cavity C1 can be adjusted by the up-and-down movement of the bottle body 200. When high-pressure gas is suddenly supplied into the first sub-cavity C1, the bottle body 200 can be raised to increase the volume of the first sub-cavity C1, thereby reducing the pressure inside the first sub-cavity C1 and mitigating the impact of the suddenly supplied high-pressure gas on the bottle body 200 and the seal 210. After the pressure inside the first sub-cavity C1 stabilizes, the bottle body 200 can descend under its own weight to reduce the pressure inside the first sub-cavity C1, thus buffering the next supply of high-pressure gas.

[0077] For example, liquid L may include, but is not limited to, water, ethylene glycol solution, etc.

[0078] For example, the bottle 200 can be placed in the buoyancy buffer trough 110. When the bottle 200 is at the lowest set height, the bottom of the bottle 200 contacts the bottom of the buoyancy buffer trough 110 and is supported by the bottom of the buoyancy buffer trough 110.

[0079] For example, the bottle body 200 can be an inverted "U" shaped structure.

[0080] For example, the buoyancy buffer tank 110 is equipped with a level gauge 111, which is used to measure the liquid level in the buoyancy buffer tank 110.

[0081] In one possible implementation, a limiting frame 112 is provided in the buoyancy buffer tank 110. The limiting frame 112 is used to abut against the bottle 200 when the bottle 200 floats to the highest set height, so as to limit the height of the bottle 200 floating.

[0082] This helps to limit the height of the bottle 200 from floating, making it less likely that the first connecting port H3 will be lifted above the liquid surface by air pressure, causing the first connecting port H3 to be exposed on the liquid surface.

[0083] In one possible implementation, a stabilizing component 220 is provided at the bottom of the bottle body 200, which is used to improve the stability of the bottle body 200 floating.

[0084] This makes the bottle 200 float more stably, making it less likely that the bottle 200 will tip over and cause the first connecting port H3 to be exposed on the liquid surface.

[0085] For example, the stabilizing component 220 can be a counterweight.

[0086] For example, multiple stabilizing components 220 may be provided at equal intervals along the axial direction of the bottle body 200.

[0087] In one possible implementation, the buffer structure 100 further includes an air bladder 120, and the oil-gas separation chamber C includes a second sub-cavity C2 formed by the inner wall of the air bladder 120. The bottle body 200 has a second communication port H4, which is located above the liquid surface of the liquid L. The air bladder 120 is sealed to the bottle body 200, and the second sub-cavity C2 communicates with the inner cavity of the bottle body 200 through the second communication port H4.

[0088] The airbag 120 is used to inflate when the pressure in the first sub-cavity C1 is greater than a second preset value and the pressure in the first sub-cavity C1 is greater than the pressure in the second sub-cavity C2, so as to increase the volume of the second sub-cavity C2 until the pressure in the second sub-cavity C2 is equal to the pressure in the first sub-cavity C1. Wherein, the second preset value is greater than the first preset value.

[0089] The airbag 120 is also used to contract when the pressure in the first sub-cavity C1 is less than the pressure in the second sub-cavity C2, so as to reduce the volume of the second sub-cavity C2 until the pressure in the second sub-cavity C2 is equal to the pressure in the first sub-cavity C1.

[0090] In this way, after the bottle 200 floats to the highest set height and the volume of the first sub-chamber C1 reaches its maximum set value, the volume of the second sub-chamber C2 can be adjusted by the expansion and contraction of the airbag 120. This increases the volume of the second sub-chamber C2, reducing the pressure within the oil-gas separation chamber C, thus facilitating the buffering of high-pressure gas. Furthermore, since the second preset value is greater than the first preset value, the buffering is achieved first by the bottle 200 floating and then by the expansion of the airbag 120. This fully utilizes both the airbag 120 and the buoyancy buffer groove 110, resulting in a greater buffering range for pressure.

[0091] For example, the airbag 120 may be, but is not limited to, a rubber airbag, a polyethylene airbag, etc. For instance, the material of the airbag 120 may be a rubber material that is resistant to carbon dioxide-water corrosion and the reaction of light crude oil and nitrogen.

[0092] For example, the thickness of the airbag 120 can be 0.5-1.0 mm.

[0093] When the pressure in the first sub-cavity C1 is greater than the second preset value and the pressure in the first sub-cavity C1 is greater than the pressure in the second sub-cavity C2, the gas in the first sub-cavity C1 flows into the second sub-cavity C2 through the second connecting port H4, causing the airbag 120 to inflate.

[0094] When the pressure in the first sub-cavity C1 is less than the pressure in the second sub-cavity C2, the gas in the second sub-cavity C2 flows into the first sub-cavity C1 through the second connecting port H4 and flows out through the air outlet H2, causing the airbag 120 to contract.

[0095] For example, a connecting pipe 340 is provided at the second connecting port H4. One end of the connecting pipe 340 is fixed and sealed to the bottle body 200 at the second connecting port H4. The airbag 120 is provided at the other end of the connecting pipe 340. The airbag 120 is connected to the second connecting port H4 through the connecting pipe 340.

[0096] For example, the buffer structure 100 may include a plurality of airbags 120, and the bottle body 200 has a plurality of second communication ports H4 corresponding to the airbags 120. The airbags 120 are sealed to the bottle body 200 at the corresponding second communication ports H4, and the second sub-cavity C2 formed in the airbags 120 is connected to the inner cavity of the bottle body 200 through the corresponding second communication holes.

[0097] In one possible implementation, a control valve 130 is provided at the second communication port H4. The airbag 120 is connected to the second communication port H4 through the control valve 130. The control valve 130 is used to open when the pressure in the first sub-cavity C1 is greater than a second preset value and when the pressure in the first sub-cavity C1 is less than the pressure in the second sub-cavity C2, so that the first sub-cavity C1 and the second sub-cavity C2 are connected.

[0098] This facilitates the control of the pressure when the gas in the first sub-cavity C1 flows into the second sub-cavity C2, so as to achieve buffering by first floating through the bottle body 200 and then expanding through the airbag 120. The airbag 120 and the buoyancy buffer tank 110 can be fully utilized to achieve buffering, resulting in a larger buffering range for pressure.

[0099] In one possible implementation, the bottle body 200 has a pressure relief port H5, and an explosion-proof valve 230 is provided at the pressure relief port H5. The explosion-proof valve 230 is used to open when the pressure in the first sub-cavity C1 is greater than a third preset value, so that the first sub-cavity C1 is connected to the space outside the bottle body 200 through the pressure relief port H5, wherein the third preset value is greater than the second preset value.

[0100] Thus, if the pressure in the oil-gas separation chamber C is still too high after being buffered by the buoyancy buffer tank 110 and the airbag 120, it can be relieved through the pressure relief port H5 to make the experiment safer.

[0101] For example, the third preset value can be 1.2 times the first preset value.

[0102] For example, the response time of the explosion-proof valve 230 is less than 0.1 seconds, that is, the explosion-proof valve 230 opens within 0.1 seconds when the pressure in the first sub-chamber C1 reaches the third preset value.

[0103] In one possible implementation, the oil-gas separator 10 further includes a cooling device 400. The cooling device 400 is disposed in the buoyancy buffer tank 110 and is used to cool the liquid L so that the temperature of the liquid L is within a preset range.

[0104] This design facilitates temperature control within the set range in the oil-gas separation chamber C, reducing the likelihood of temperature increases in C due to the entry of high-temperature, high-pressure fluid, which could affect measurement accuracy. This improves the accuracy and reliability of the obtained data. Furthermore, the bottle 200 is less prone to cracking due to excessive temperature.

[0105] For example, the preset range can be 0-20℃.

[0106] For example, the cooling device 400 may include a refrigerator, a liquid supply pipe and a liquid return pipe. The inlet of the refrigerator is connected to the inner cavity of the buoyancy buffer tank 110 through the liquid return pipe, and the outlet of the refrigerator is connected to the inner cavity of the buoyancy buffer tank 110 through the liquid supply pipe. The liquid L in the buoyancy buffer tank 110 can flow into the refrigerator through the liquid return pipe for cooling, and then flow back into the buoyancy buffer tank 110 through the liquid supply pipe.

[0107] In one possible implementation, the oil-gas separation device 10 further includes a first oil storage container 510 and a second oil storage container 520. Both the first oil storage container 510 and the second oil storage container 520 are disposed within a first sub-cavity C1. The tops of both the first oil storage container 510 and the second oil storage container 520 have open structures. The first oil storage container 510 is fitted inside the second oil storage container 520, and an annular space S for oil storage is formed between the second oil storage container 520 and the first oil storage container 510.

[0108] One end of the fluid inlet pipe 310 located inside the bottle body 200 is located inside the first oil storage container 510. The first oil storage container 510 is used to receive the oil flowing out from the end of the fluid inlet pipe 310 located inside the bottle body 200. There is a gas flow channel T between the fluid inlet pipe 310, the first oil storage container 510, and the second oil storage container 520, which connects the end of the fluid inlet pipe 310 located inside the bottle body 200 with the gas outlet H2.

[0109] In this way, for small-scale experiments with small sample volumes and short durations, the first oil storage container 510 can be used to contain and measure the separated oil, resulting in high measurement accuracy. For experiments with larger sample volumes and longer experimental times, the first oil storage container 510 and the second oil storage container 520 can be used to contain the separated oil, thus meeting the needs of experiments with larger sample volumes and longer experimental times.

[0110] For example, the first oil storage container 510 can measure the volume of the oil contained therein.

[0111] For example, the second oil storage container 520 can measure the volume of the oil contained therein.

[0112] For example, both the first oil storage container 510 and the second oil storage container 520 can be test tubes.

[0113] For example, the first oil storage container 510 can be fixedly connected to the bottle body 200 or the fluid inlet pipe 310 via the first bracket.

[0114] For example, the second oil storage container 520 can be fixedly connected to the bottle body 200 or the fluid inlet pipe 310 via the second bracket.

[0115] In one possible implementation, the oil-gas separator 10 further includes a third oil storage container 530 and an oil guide pipe 320. The third oil storage container 530 is located outside the bottle body 200, and the oil guide pipe 320 passes through the bottle body 200. The lower end of the oil guide pipe 320 is located outside the bottle body 200 and communicates with the third oil storage container 530, while the upper end of the oil guide pipe 320 is located inside the bottle body 200 and communicates with the second oil storage container 520.

[0116] In this way, the separated oil can be contained by the first oil storage container 510, the second oil storage container 520 and the third oil storage container 530. The third oil storage container 530 is located outside the bottle body 200. The bottle body 200 does not restrict the size of the third oil storage container 530, which allows the third oil storage container 530 to have a large volume, which is beneficial to meet the needs of experiments with large sample volume and long experimental time.

[0117] For example, the third oil storage container 530 can measure the volume of the oil contained therein.

[0118] For example, the third oil storage container 530 can be a beaker.

[0119] For example, at least a portion of the oil guide tube 320 is a flexible tube structure, so that the up-and-down movement of the bottle body 200 has little impact on the oil guiding of the oil guide tube 320.

[0120] Figure 2 This is a schematic diagram of a core displacement experimental system provided in an embodiment of this application.

[0121] like Figure 2 As shown, and see Figure 1 This application also provides a core displacement experimental system, which includes a fluid injection device 30, a core holder 20, and an oil-gas separation device 10 as described in any of the above embodiments. The core holder 20 is used to hold the core to be tested. The output end of the fluid injection device 30 is connected to the inlet of the core holder 20, and the outlet of the core holder 20 is connected to one end of the fluid inlet pipe 310 located outside the bottle body 200.

[0122] For example, the core displacement experimental system can be used for gas-driven oil core displacement experiments using carbon dioxide, nitrogen, etc.

[0123] In some examples, the fluid injection device 30 includes a first injection component 31, a second injection component 32, and an injection pump 33. The output ends of the first injection component 31 and the second injection component 32 are both connected to the inlet of the core holder 20. The first injection component 31 is used to inject gas into the core holder 20, and the second injection component 32 is used to inject oil into the core holder 20. The injection pump 33 is connected to the first injection component 31 and the second injection component 32 and is used to drive the first injection component 31 and the second injection component 32.

[0124] For example, a first back pressure valve 53 is provided between the outlet of the core holder 20 and the fluid inlet pipe 310. The upstream of the first back pressure valve 53 is a high temperature and high pressure fluid. After passing through the first back pressure valve 53, the fluid expands under low pressure, and then the oil-gas separation device 10 performs oil-gas separation.

[0125] For example, a first pressure gauge 51 is provided between the fluid injection device 30 and the inlet of the core holder 20. The first pressure gauge 51 is used to detect the pressure of the fluid injected into the core holder 20.

[0126] For example, a second pressure gauge 52 is provided between the outlet of the core holder 20 and the first back pressure valve 53. The second pressure gauge 52 is used to detect the pressure of the fluid flowing out of the outlet of the core holder 20.

[0127] This application also provides a gas-drive oil core displacement test method using a core displacement test system, including the following steps:

[0128] S110: Core preparation. Specifically, after drilling the core, it is washed and dried to remove the original fluids, and then vacuum-saturated with formation water to simulate the original water saturation.

[0129] S120: Establish the original reservoir conditions.

[0130] S130: Conduct a displacement experiment. Specifically, oil and gas phase components are injected into the core holder 20 via the fluid injection device 30. This includes single-phase permeability testing, i.e., testing the absolute permeability of the oil and gas phases, and multiphase displacement experiments. During the displacement experiment, the pressure of the fluid injected into the core holder 20 can be detected by the first pressure gauge 51.

[0131] S140: Oil-gas separation is performed. Specifically, the fluid flowing out of the core holder 20 is introduced into the oil-gas separation chamber C through the fluid inlet pipe 310. After the fluid is separated according to density, the oil phase flows to the first oil storage container 510, and the gas phase flows out of the oil-gas separation chamber C through the gas outlet H2. During the oil-gas separation process, the pressure of the fluid flowing out of the core holder 20 can be detected by the second pressure gauge 52.

[0132] S150: Determine the oil and gas content. Specifically, the volume of the oil component can be obtained by measuring the volume of the oil phase in the first oil storage container 510, the second oil storage container 520, and the third oil storage container 530, and the volume of the gas component can be determined by the gas meter 600.

[0133] S160: Perform data analysis. Specifically, the oil and gas content data obtained above can be used to calculate permeability, oil displacement efficiency, etc., and to plot relative permeability or pressure change curves.

[0134] The gas-driven oil core displacement test method provided in this application embodiment can simulate the flow law of fluid in porous media under formation conditions and evaluate parameters such as oil displacement efficiency and permeability changes, providing an effective and reliable basis for the development of the reservoir where the core is located.

[0135] Figure 3This is a schematic diagram of an oil and gas phase experimental system provided in an embodiment of this application.

[0136] like Figure 3 As shown, and see Figure 1 This application also provides an oil and gas phase experiment system, which includes an oil and gas phase experiment component 40 and an oil and gas separation device 10 as described in any of the above embodiments.

[0137] The outlet of the oil-gas phase experimental assembly 40 is connected to the end of the fluid inlet pipe 310 located outside the bottle body 200.

[0138] For example, the oil-gas phase experiment assembly 40 is used to determine the physical properties of the fluid, including at least one of saturation pressure, bubble point, dew point and viscosity.

[0139] For example, the oil and gas phase phase experimental assembly 40 includes an autoclave 41, a constant temperature chamber 42, a connecting pipe 44, and a high-pressure viscometer 43. The autoclave 41 is a high-pressure vessel for achieving phase equilibrium of the oil or gas sample. The autoclave 41 and the high-pressure viscometer 43 are housed inside the constant temperature chamber 42, which is used to maintain the formation temperature. The outlet of the autoclave 41 is connected to the connecting pipe 44, and the outlet of the connecting pipe 44 is connected to one end of the fluid inlet pipe 310 located outside the bottle body 200. The high-pressure viscometer 43 is located on the connecting pipe 44 and is connected to the outlet of the autoclave 41 through the connecting pipe 44. The high-pressure viscometer 43 is used for online measurement of the viscosity of the high-pressure gas-containing oil.

[0140] For example, the oil and gas phase experimental assembly 40 includes two autoclaves 41, and the outlets of the two autoclaves 41 are connected by a connecting pipe 44.

[0141] For example, the high-pressure viscometer 43 includes a capillary tube 43a and a differential pressure sensor 43b. Both the capillary tube 43a and the differential pressure sensor 43b are located in the connecting pipe 44. The capillary tube 43a is used to allow fluid to pass through, and the differential pressure sensor 43b is used to detect the pressure difference across the capillary tube 43a. The viscosity of high-pressure gas-containing oil can be measured online through the capillary tube 43a and the differential pressure sensor 43b.

[0142] For example, the autoclave 41 has a viewing window. The viewing window of the autoclave 41 used for black oil is at the top to observe the bubble point. The viewing window of the autoclave 41 used for condensate gas is at the bottom to observe the dew point. The viewing window can be made of sapphire or high-strength glass.

[0143] For example, the autoclave 41 is equipped with a pressure sensor 45 to detect the pressure inside the autoclave 41.

[0144] For example, the autoclave 41 is equipped with a high-pressure metering pump, which can be used to pressurize and meter the volume of fluid inside the autoclave 41.

[0145] For example, the oil-gas phase experimental assembly 40 also includes a second back pressure valve 46, which is located outside the constant temperature chamber 42 and between the outlet of the autoclave 41 and the fluid inlet pipe 310. The upstream of the second back pressure valve 46 is a high-temperature and high-pressure fluid. After passing through the second back pressure valve 46, the fluid expands under low pressure, and then the oil-gas separation device 10 performs oil-gas separation.

[0146] This application also provides an oil and gas phase state experimental method using an oil and gas phase state experimental system, including the following steps:

[0147] S210: Sample collection and preparation.

[0148] S220: Conduct PVT experiments. Specifically, the bubble point and dew point can be observed through the autoclave 41, and the volume of the fluid inside the autoclave 41 can be pressurized and measured using a high-pressure metering pump.

[0149] S230: Viscosity measurement. Specifically, the viscosity of high-pressure gas-containing oil can be measured online using capillary tube 43a and differential pressure sensor 43b.

[0150] In some examples, step S210 may include:

[0151] S211: Oil-gas separation. Specifically, the fluid after the core displacement experiment is introduced into the oil-gas separation chamber C through the fluid inlet pipe 310. After the fluid is separated according to density, the oil phase and the gas phase are collected separately.

[0152] S212: Determine the oil and gas content. Specifically, the volume of the oil component can be obtained by measuring the volume of the oil phase in the first oil storage container 510, the second oil storage container 520, and the third oil storage container 530, and the volume of the gas component can be determined by the gas meter 600.

[0153] S213: Perform sample recombination. Specifically, the separated oil and gas are mixed according to the production ratio to restore the original reservoir fluid.

[0154] In other examples, the sample may also be directly collected raw reservoir fluid.

[0155] The oil and gas phase state experimental method provided in this application can determine the high-pressure physical properties of oil and gas, such as saturation pressure, bubble point, and dew point, providing an effective and reliable basis for calculating oil and gas reserves and analyzing the dynamics of oil and gas reservoirs.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An oil and gas separation device (10) characterized by, The utility model relates to a kind of oil-gas separation cavity, comprising: Buffer structure (100); Bottle body (200), the bottle body (200) is used to construct the oil-gas separation cavity (C) with the buffer structure (100) variable volume, the bottle body (200) has inlet (H1) and gas outlet (H2), the inlet (H1) and the gas outlet (H2) are communicated with the oil-gas separation cavity (C); Seal (210), the seal (210) is located at the inlet (H1), and the seal (210) is fixed with the bottle body (200) and is sealedly connected; Fluid introduction pipe (310), the fluid introduction pipe (310) is arranged in the seal (210), one end of the fluid introduction pipe (310) is located in the bottle body (200) and is communicated with the oil-gas separation cavity (C), the other end of the fluid introduction pipe (310) is located outside the bottle body (200) and is used to be communicated with the outlet of core holder (20) of core displacement experiment system or the outlet of oil-gas phase experiment assembly (40) of oil-gas phase experiment system; The buffer structure (100) is used to make the volume of the oil-gas separation cavity (C) increase when the pressure in the oil-gas separation cavity (C) is greater than the first preset value, until the pressure in the oil-gas separation cavity (C) drops to the first preset value or the volume of the oil-gas separation cavity (C) reaches the maximum set value; The buffer structure (100) is also used to make the volume of the oil-gas separation cavity (C) decrease when the pressure in the oil-gas separation cavity (C) is less than the first preset value, until the pressure in the oil-gas separation cavity (C) reaches the first preset value or the volume of the oil-gas separation cavity (C) reaches the minimum set value; The buffer structure (100) includes buoyancy buffer groove (110);The bottle body (200) is arranged in the buoyancy buffer groove (110), and the bottom of the bottle body (200) has first communication port (H3), and the first communication port (H3) communicates the inner chamber of the bottle body (200) with the inner chamber of the buoyancy buffer groove (110); The inner chamber of the buoyancy buffer groove (110) is used to contain liquid (L), and the first communication port (H3) is used to be immersed in the liquid (L), and the liquid (L) can flow between the inner chamber of the buoyancy buffer groove (110) and the inner chamber of the bottle body (200) through the first communication port (H3); The oil-gas separation cavity (C) includes first sub-cavity (C1) formed by the inner wall of the bottle body (200) and the liquid level of the part of the liquid (L) located in the bottle body (200), and the bottle body (200) can float up and down between the highest set height and the lowest set height in the buoyancy buffer groove (110) to adjust the volume of the first sub-cavity (C1). The buoyancy buffer tank (110) and the liquid (L) are used to make the bottle body (200) float relative to the buoyancy buffer tank (110) when the pressure in the first sub-cavity (C1) is greater than the first preset value, so as to increase the volume of the first sub-cavity (C1), until the pressure in the first sub-cavity (C1) is reduced to the first preset value or the bottle body (200) is floated to the highest set height; The buoyancy buffer tank (110) and the liquid (L) are also used to make the bottle body (200) descend relative to the buoyancy buffer tank (110) when the pressure in the first sub-cavity (C1) is less than the first preset value, so as to reduce the volume of the first sub-cavity (C1), until the pressure in the first sub-cavity (C1) reaches the first preset value or the bottle body (200) is lowered to the lowest set height.

2. The oil and gas separation device (10) according to claim 1, characterized in that The buoyancy buffer tank (110) is provided with a limiting frame (112), which is used to abut against the bottle body (200) when the bottle body (200) is floated to the highest set height, so as to limit the height of the bottle body (200) floating; And / or, the bottom of the bottle body (200) is provided with a stabilizing component (220), which is used to improve the stability of the bottle body (200) floating.

3. The oil and gas separation device (10) of claim 1, wherein, The buffer structure (100) further comprises a gas bag (120), and the oil-gas separation cavity (C) comprises a second sub-cavity (C2) formed by an inner wall of the gas bag (120); The bottle body (200) has a second communication port (H4) located above the liquid level of the liquid (L), the gas bag (120) is sealingly connected with the bottle body (200), and the second sub-cavity (C2) is in communication with the inner cavity of the bottle body (200) through the second communication port (H4); The gas bag (120) is used to expand when the pressure in the first sub-cavity (C1) is greater than a second preset value and the pressure in the first sub-cavity (C1) is greater than the pressure in the second sub-cavity (C2), so as to increase the volume of the second sub-cavity (C2), until the pressure in the second sub-cavity (C2) is equal to the pressure in the first sub-cavity (C1); The gas bag (120) is also used to contract when the pressure in the first sub-cavity (C1) is less than the pressure in the second sub-cavity (C2), so as to reduce the volume of the second sub-cavity (C2), until the pressure in the second sub-cavity (C2) is equal to the pressure in the first sub-cavity (C1); Wherein, the second preset value is greater than the first preset value.

4. The oil and gas separation device (10) according to claim 3, characterized in that The second communication port (H4) is provided with a control valve (130), the gas bag (120) is in communication with the second communication port (H4) through the control valve (130), and the control valve (130) is used to open when the pressure in the first sub-cavity (C1) is greater than a second preset value and the pressure in the first sub-cavity (C1) is less than the pressure in the second sub-cavity (C2), so as to make the first sub-cavity (C1) and the second sub-cavity (C2) communicate; And / or, the bottle body (200) has a pressure relief port (H5), and the pressure relief port (H5) is provided with an explosion-proof valve (230), and the explosion-proof valve (230) is used for opening when the pressure in the first sub-cavity (C1) is greater than a third preset value, so that the first sub-cavity (C1) communicates with the space outside the bottle body (200) through the pressure relief port (H5), wherein the third preset value is greater than the second preset value.

5. The oil and gas separating device (10) according to any one of claims 1-4, characterized in that, Further comprising a cooling device (400); The cooling device (400) is arranged in the buoyancy buffer tank (110), and the cooling device (400) is used for cooling the liquid (L) so that the temperature of the liquid (L) is in a preset range.

6. The oil and gas separating device (10) according to any one of claims 1-4, characterized in that Further comprising a first oil storage container (510) and a second oil storage container (520); The first oil storage container (510) and the second oil storage container (520) are both arranged in the first sub-cavity (C1), the top of the first oil storage container (510) and the top of the second oil storage container (520) both have an opening structure, the first oil storage container (510) is sleeved in the second oil storage container (520), and an annular space (S) for storing oil is formed between the second oil storage container (520) and the first oil storage container (510); The fluid inlet pipe (310) is located in the bottle body (200), and one end of the fluid inlet pipe (310) located in the bottle body (200) is located in the first oil storage container (510), the first oil storage container (510) is used for receiving oil flowing out from one end of the fluid inlet pipe (310) located in the bottle body (200), and the fluid inlet pipe (310) has a gas flow channel (T) communicating one end of the fluid inlet pipe (310) located in the bottle body (200) with the gas outlet (H2) between the first oil storage container (510) and the second oil storage container (520).

7. The oil and gas separation device (10) according to claim 6, characterized in that Further comprising a third oil storage container (530) and an oil guide pipe (320); The third oil storage container (530) is located outside the bottle body (200), the oil guide pipe (320) penetrates the bottle body (200), a lower end of the oil guide pipe (320) is located outside the bottle body (200) and communicates with the third oil storage container (530), and an upper end of the oil guide pipe (320) is located in the bottle body (200) and communicates with the second oil storage container (520).

8. A core flooding system, characterized in that, The fluid injection device (30), the core holder (20), and the oil-gas separation device (10) as claimed in any one of claims 1-7 are included. An output end of the fluid injection device (30) communicates with an inlet of the core holder (20), and an outlet of the core holder (20) communicates with one end of a fluid inlet pipe (310) of the oil-gas separation device (10) located outside a bottle body (200) of the oil-gas separation device (10).

9. An oil and gas phase behavior experimental system characterized by, The oil-gas phase experiment assembly (40) and the oil-gas separation device (10) as claimed in any one of claims 1-7 are included. The outlet of the oil-gas phase state experimental assembly (40) is communicated with the fluid introduction pipe (310) of the oil-gas separation device (10) at the end outside the bottle body (200) of the oil-gas separation device (10).

Images