A high-temperature and high-pressure visual oil-water metering device and method

Abstract

The present invention discloses a high-temperature and high-pressure visual oil-water metering device and method, including a metering body, wherein the metering body is provided with a metering cavity, and the metering cavity is a mutually connected well-shaped channel inner cavity, that is, the well-shaped channel inner cavity includes an upper horizontal metering channel, a lower horizontal metering channel, a left vertical metering channel, and a right vertical metering channel. The "well"-shaped inner cavity in the structural design of the present invention plays the role of a U-shaped tube during the experiment, making full use of the physical phenomenon of automatic gravity separation of oil and water due to density difference. The upper part of the inner cavity is used to meter high-pressure gas-containing crude oil, and the lower part is used to meter high-temperature and high-pressure water. The pressure of the high-pressure gas-containing crude oil and the high-temperature and high-pressure water outlet pipe is controlled by a back pressure valve to simulate the reservoir pressure, so that the pressure of the entire metering system is always higher than the gas bubble point pressure, and crude oil degassing will not occur, ensuring that the crude oil in the core always remains in a gas-containing state, providing a guarantee for the subsequent core pressure reduction and degassing process.

Description

Technical Field

[0001] The invention relates to the technical field of conducting a core decompression and degassing water saturation correction experiment of an indoor closed coring well to evaluate the residual oil saturation of a water-flooded layer during oilfield development, and specifically to a high-temperature and high-pressure visual oil-water metering device and method. Background Art

[0002] With the continuous deepening of water injection development in oil fields, the water content of reservoirs is getting higher and higher. The accurate evaluation of the remaining oil saturation of water-flooded layers is an important basis for adjusting the development plan in the later stage of oil field development. There is an error between the oil and water saturation of the core of the closed well analyzed indoors and the true values ​​of the oil and water saturation under formation conditions. For this reason, a depressurized degassing water saturation correction is carried out to indirectly evaluate the remaining oil saturation. High-pressure gas-containing crude oil (i.e., live oil) is required in the depressurized degassing water saturation correction experiment. Therefore, the pressure of the entire experimental system must be maintained at the reservoir pressure to prevent crude oil degassing. It is necessary to invent a high-temperature and high-pressure visual oil and water metering device for indoor experiments.

[0003] The existing oil-water metering device utility model patents CN 204461520 U, CN 207920598 U and invention patents CN 101832804 A, CN 101986107 A are all oil-water metering devices that can be used for indoor physical simulation oil displacement experiments, but they all use glass tubes or measuring bottles as oil-water metering containers, which have no pressure bearing capacity and cannot be used for high-temperature and high-pressure oil-water metering. To this end, we invented a high-temperature and high-pressure visual oil-water metering device to solve the above technical problems.

[0004] Publication (announcement) number: CN204461520U, Publication (announcement) date: 2015-07-08. It relates to an oil, gas and water metering device suitable for indoor oil displacement experiments. It mainly solves the problem that the existing conventional metering methods are inaccurate, time-consuming and labor-intensive. It is characterized in that: the oil-water separation device is connected to a base at the bottom, and connected to pipelines A and D at the top; the pipeline A is connected to valve A, and valve A is connected to the oil-gas-water mixture inlet A; the pipeline B is connected to the oil-water mixture inlet B through valve B; the pipeline C is connected to the water outlet pipe A, and the water outlet pipe A is connected to the water container A, and the water container A is placed on an electronic balance A; the pipeline D is connected to the upper part of the gas metering device through valve C, and the pipeline E connected to the lower part of the gas metering device is connected to the water outlet pipe B through valve D, and the water outlet pipe B is connected to the water container B. The oil, gas and water metering device suitable for indoor oil displacement experiments can separate oil, gas and water, and accurately measure the volume of oil, gas and water.

[0005] Publication (announcement) number: CN207920598U, Publication (announcement) date: 2018-09-28 A metering device capable of accurately measuring the volume of oil-water phases is disclosed, belonging to the field of oil-water metering. It includes two weighing devices connected in series, on which a first metering bottle and a second metering bottle are respectively placed, the first metering bottle and the second metering bottle both have sealed bottle caps, and also include a liquid inlet pipe, a liquid guide pipe and an exhaust pipe, one end of the liquid inlet pipe and one end of the liquid guide pipe both extend into the first metering bottle, the end face of one end of the liquid guide pipe extending into the first metering bottle is lower than the end face of one end of the liquid inlet pipe extending into the first metering bottle, the other end of the liquid guide pipe and one end of the exhaust pipe both extend into the second metering bottle, and also include a branch pipe parallel to the first metering bottle, the branch pipe is provided with a scale, and the lower end of the branch pipe is connected to the bottom of the first metering bottle.

[0006] Publication (announcement) number: CN101832804B, Publication (announcement) date: 2012-04-04 An oil-water meter is disclosed, including an oil-water meter and a camera monitor, which are used in combination; the oil-water meter includes a base, a column, a glass tube and a scale plate, the glass tube and the scale plate are connected to the column, the lower end of the glass tube has a liquid inlet pipe and a liquid outlet pipe, and the column is fixedly connected to the base; the camera monitor includes a camera device and a frame, and the frame also has an operating device, a driving device and a lifting mechanism, the driving device is transmission-connected to the lifting mechanism, the camera device is fixedly connected to the lifting mechanism, the operating device controls the driving device and the camera device, and is used to measure the oil and water level on the oil-water meter; the camera device faces the direction of the glass tube and the scale plate. The present invention records accurately and can save side effort.

[0007] Publication (announcement) number: CN101986107A, Publication (announcement) date: 2011-03-16 An oil-water metering device is disclosed, comprising a base, a bracket, a glass tube, a fixed plate, a liquid inlet pipe and a liquid outlet pipe, the bracket is fixedly connected to the base, the fixed plate is fixedly connected to the bracket, the glass tube is fixedly connected to the bracket, the lower end of the glass tube has a pipe plug, the liquid inlet pipe and the liquid outlet pipe pass through the pipe plug at the lower end of the glass tube and are connected to the inner cavity of the glass tube, the upper end of the liquid inlet pipe is higher than the upper end of the liquid outlet pipe, the upper part of the inner cavity of the glass tube is an air zone, the middle part is an oil zone, and the lower part is a water zone, the air zone of the glass tube is connected to at least one first branch pipe, the oil zone is connected to at least one second branch pipe, the water zone is connected to at least one third branch pipe, and the first branch pipe, the second branch pipe and the third branch pipe are all connected to the graduated tube, and the graduated tube is fixedly connected to the fixed plate. The present invention displays data clearly.

[0008] The technical solutions, technical problems to be solved and beneficial effects produced by the above-disclosed technologies are different from the present invention, or are in different technical fields or application scenarios. Regarding more technical features, technical problems to be solved and beneficial effects of the present invention, the above-disclosed technical documents do not contain any technical inspiration. Summary of the invention

[0009] The purpose of the present invention is to provide a high-temperature and high-pressure visual oil-water metering device and method in view of the above-mentioned defects in the prior art. The "well"-shaped inner cavity in the structural design plays the role of a U-shaped tube during the experiment, making full use of the physical phenomenon of automatic gravity separation of oil and water due to density difference. The upper part of the inner cavity is used to meter the high-pressure gas-containing crude oil, and the lower part is used to meter the high-temperature and high-pressure water. The pressure of the high-pressure gas-containing crude oil and the high-temperature and high-pressure water outlet pipe is controlled by the back pressure valve to simulate the reservoir pressure, so that the pressure of the entire metering system is always higher than the gas bubble point pressure, and the crude oil degassing phenomenon will not occur, which ensures that the crude oil in the core always remains in a gas-containing state, providing a guarantee for the subsequent core pressure reduction and degassing process.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A high-temperature and high-pressure visualized oil-water metering device comprises a metering body, wherein the metering body is provided with a metering cavity, and the metering cavity is a tic-tac-toe-shaped channel inner cavity interconnected with each other, that is, the tic-tac-toe-shaped channel inner cavity comprises an upper horizontal metering channel, a lower horizontal metering channel, a left vertical metering channel, and a right vertical metering channel.

[0012] Furthermore, both left and right ports of the upper horizontal metering channel are equipped with plugging parts, and both left and right ports of the lower horizontal metering channel are also equipped with plugging parts; the upper port of the left longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing crude oil inlet pipe through a joint, the lower port of the left longitudinal metering channel is connected to the high-temperature and high-pressure water inlet pipe through a joint, the upper port of the right longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing oil outlet pipe through a joint, and the lower port of the right longitudinal metering channel is connected to the high-temperature and high-pressure water outlet pipe through a joint.

[0013] Furthermore, the outlet of the high-temperature and high-pressure gas-containing oil outlet pipe and the outlet of the high-temperature and high-pressure water outlet pipe are both connected to the inlet of the back-pressure valve, and the outlet of the back-pressure valve is connected to the liquid collection container.

[0014] Furthermore, the high-temperature and high-pressure gas-containing crude oil inlet pipe, the high-temperature and high-pressure water inlet pipe, the high-temperature and high-pressure gas-containing oil outlet pipe, and the high-temperature and high-pressure water outlet pipe are all installed with valves.

[0015] Furthermore, the measuring body is made of transparent material.

[0016] Furthermore, the metering body is made of metal, and is provided with a window, which is connected to the right longitudinal metering channel, and a visual window is sealed on the window.

[0017] Furthermore, the visualization window is made of sapphire glass and is sealed and embedded in the window.

[0018] Furthermore, a scale for oil and water metering is engraved on the side of the window of the metering body, the pressure resistance of the inner cavity of the tic-tac-toe channel and the pressure resistance of the visualization window are both 50MPa, and the high temperature resistance of the inner cavity of the tic-tac-toe channel and the high temperature resistance of the visualization window are both 100°C.

[0019] In order to achieve the above object, the present invention adopts the following technical solutions:

[0020] A metering method for a high-temperature and high-pressure visual oil-water metering device comprises the following steps:

[0021] The first step is to connect the metering device to the core displacement device;

[0022] The second step is to establish the initial oil-water interface in the inner cavity;

[0023] The third step is to establish high temperature and high pressure conditions in the experimental system by water-flooding the core;

[0024] The fourth step is to measure the water output from the oil-driven core and determine the bound water volume;

[0025] The fifth step is to measure the oil output of the water-driven core and establish the water saturation of the core before depressurization and degassing;

[0026] The sixth step is to clean the inner cavity of the metering device.

[0027] Further, in the first step, the metering device is connected to the core displacement device; first, the water-saturated core is loaded into the displacement device, and the outlet of the displacement device is connected to the high-temperature and high-pressure inlet pipeline of the oil-water metering device;

[0028] The second step is to establish the initial oil-water interface of the inner cavity; open the valve of the high-temperature and high-pressure water inlet pipeline, close the valve of the outlet pipeline, close the valves of the high-temperature and high-pressure gas-containing crude oil inlet and outlet pipelines, drive the simulated formation water to 2 / 3 of the volume of the oil-water metering cavity under normal pressure, and close the valve of the high-temperature and high-pressure water inlet pipeline; then, open the valves of the high-temperature and high-pressure gas-containing crude oil inlet and outlet pipelines, so that the crude oil under normal pressure fills the cavity of the oil-water metering device;

[0029] The third step is to establish high temperature and high pressure conditions for the experimental system of the water-driven core; the temperature of the oven where the oil-water metering device is placed is raised to the experimental temperature, and the pressure of the back pressure valve is raised to the experimental pressure; the core is displaced by high temperature and high pressure simulated formation water, at this time, the valves of the inlet and outlet pipelines of the high temperature and high pressure gas-containing crude oil are kept closed, and the valves of the inlet and outlet pipelines of the high temperature and high pressure water are opened. When liquid flows out of the collection container, an oil-water interface under high temperature and high pressure is established, and the volume V1 corresponding to the oil-water interface in the oil-water metering visualization window is recorded;

[0030] The fourth step is to measure the water output of the oil-driven core and determine the bound water volume; after the initial oil-water interface is established under high temperature and high pressure conditions, the saturated water in the core is displaced by high temperature and high pressure gas-containing crude oil to establish the original oil saturation and determine the bound water saturation; the inlet and outlet valves of the high temperature and high pressure water are closed, and the inlet and outlet valves of the high temperature and high pressure gas-containing crude oil are opened to drive the oil into the water; due to the gravity separation of oil and water, the driven water falls into the inner cavity of the metering device, causing the oil-water interface in the cavity to rise, and the high temperature and high pressure gas-containing crude oil enters the collection container through the outlet pipeline and the back pressure valve. After the oil-water interface is stable, the inlet and outlet pipelines of the high temperature and high pressure gas-containing crude oil are closed, and the volume V2 corresponding to the oil-water interface in the visualization window is recorded at this time, and the volume of the bound water is V0-(V2-V1);

[0031] The fifth step is to measure the oil output of the water-driven core and establish the water saturation of the core before depressurization and degassing; open the valves of the high-temperature and high-pressure water inlet and outlet pipelines to carry out the high-temperature and high-pressure water drive stage of the high-temperature and high-pressure gas-containing crude oil in the core; due to the gravity differentiation of oil and water, the high-temperature and high-pressure gas-containing crude oil displaced from the core floats up and remains in the inner cavity of the oil-water metering device, causing the oil-water interface in the cavity to drop. After the visualization window shows that the oil-water interface reaches a certain volume V3, close the high-temperature and high-pressure water inlet and outlet valves. At this time, the water saturation S before the core depressurization and degassing is established in the core. 脱气前 =[(V2-V3)+(V0-V2+V1)] / V0×100%; the water saturation before depressurization is S 脱气前 The core simulates the depressurization process of the core from the bottom of the well to the ground. The water saturation S of the core after depressurization and degassing is determined by indoor routine core analysis. 脱气后 , then the saturation loss caused by core decompression and degassing is ΔS = S 脱气前 -S 脱气后 ;

[0032] The sixth step is to clean the inner cavity of the metering device; after the experiment is completed, clean the inner cavity of the oil-water metering device; use the left and right ports of the upper horizontal metering channel and the left and right ports of the lower horizontal metering channel in pairs for cleaning, keep two of the interfaces open, and close the remaining two interfaces, and use a cleaning agent to clean them under high temperature conditions.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention is to accurately measure oil and water when using gas-containing crude oil for displacement experiments in core decompression and degassing water saturation correction experiments. The metering device of the present invention is different from previous patents. The "well"-shaped inner cavity in the structural design plays the role of a U-shaped tube during the experiment, making full use of the physical phenomenon of automatic gravity separation of oil and water due to density difference. The upper part of the inner cavity is used to measure high-pressure gas-containing crude oil, and the lower part is used to measure high-temperature and high-pressure water. The pressure of the high-pressure gas-containing crude oil and high-temperature and high-pressure water outlet pipe is controlled by a back pressure valve to simulate the reservoir pressure, so that the pressure of the entire metering system is always higher than the gas bubble point pressure, and crude oil degassing will not occur, ensuring that the crude oil in the core always remains in a gas-containing state, providing a guarantee for the subsequent core decompression and degassing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural schematic diagram of a high-temperature and high-pressure visual oil-water metering device of the present invention;

[0036] Figure 2 This is a cross-sectional view of a "well"-shaped inner cavity inside a high-temperature and high-pressure visual oil-water metering device of the present invention;

[0037] Figure 3 The present invention is a flowchart of a specific embodiment of a high-temperature and high-pressure visual oil-water metering device.

[0038] In the figure: 1. High-temperature and high-pressure gas-containing crude oil inlet pipe, 2. Valve, 3. Dead plug, 4. Dead plug, 5. Valve, 6. High-temperature and high-pressure water inlet pipe, 7. High-temperature and high-pressure water outlet pipe, 8. Valve, 9. Dead plug, 10. Water in the lower part of the inner cavity, 11. Visualization window, 12. Oil in the upper part of the inner cavity, 13. Dead plug, 14. Valve, 15. High-temperature and high-pressure gas-containing oil outlet pipe, 16. Back pressure valve, 17. Liquid collection container. DETAILED DESCRIPTION

[0039] 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.

[0040] Embodiment 1:

[0041] See also Figures 1 to 3 , the present invention provides a technical solution:

[0042] A high-temperature and high-pressure visualized oil-water metering device comprises a metering body, wherein the metering body is provided with a metering cavity, and the metering cavity is a tic-tac-toe-shaped channel inner cavity interconnected with each other, that is, the tic-tac-toe-shaped channel inner cavity comprises an upper horizontal metering channel, a lower horizontal metering channel, a left vertical metering channel, and a right vertical metering channel.

[0043] Furthermore, both left and right ports of the upper horizontal metering channel are equipped with plugging parts, namely, dead plugs 3 and 13, and both left and right ports of the lower horizontal metering channel are also equipped with plugging parts, namely, dead plugs 4 and 9; the upper port of the left longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 through a joint, the lower port of the left longitudinal metering channel is connected to the high-temperature and high-pressure water inlet pipe 6 through a joint, the upper port of the right longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing oil outlet pipe 15 through a joint, and the lower port of the right longitudinal metering channel is connected to the high-temperature and high-pressure water outlet pipe 7 through a joint.

[0044] Furthermore, the outlet of the high-temperature and high-pressure gas-containing oil outlet pipe and the outlet of the high-temperature and high-pressure water outlet pipe are both connected to the inlet of the back-pressure valve 16 , and the outlet of the back-pressure valve is connected to the liquid collection container 17 .

[0045] Furthermore, the high-temperature and high-pressure gas-containing crude oil inlet pipe, the high-temperature and high-pressure water inlet pipe, the high-temperature and high-pressure gas-containing oil outlet pipe, and the high-temperature and high-pressure water outlet pipe are all installed with valves.

[0046] Furthermore, the metering body is made of metal, and a window is provided on the metering body, the window is connected to the right longitudinal metering channel, and the window is sealed to install a visual window 11. This scheme is a visual scheme, and of course there can be other deformed visual schemes, all within the protection scope of the present invention.

[0047] Furthermore, the visualization window is made of sapphire glass and is sealed and embedded in the window.

[0048] Furthermore, a scale for oil and water metering is engraved on the side of the window of the metering body, the pressure resistance of the inner cavity of the tic-tac-toe channel and the pressure resistance of the visualization window are both 50MPa, and the high temperature resistance of the inner cavity of the tic-tac-toe channel and the high temperature resistance of the visualization window are both 100°C.

[0049] The high-temperature and high-pressure visual oil-water metering device comprises a high-pressure gas-containing crude oil inlet pipe 1 and an outlet pipeline 15, a high-temperature and high-pressure water inlet pipe 6 and an outlet pipeline 7, a visual metering window 11, a back pressure valve 16 and an outlet liquid collection container 17. The high-temperature and high-pressure visual oil-water metering device is internally designed with a "well"-shaped inner cavity ( Figure 1 The entire metering device is placed in a high-temperature oven.

[0050] The high-pressure gas-containing crude oil inlet pipe 1 and outlet pipeline 15 of the high-temperature and high-pressure visual oil-water metering device are connected to the upper part of the inner cavity and are respectively controlled by valves 2 and 14 to switch; the high-temperature and high-pressure water inlet pipe 6 and outlet pipeline 7 are connected to the lower part of the inner cavity and are also controlled by valves 5 and 8 to switch respectively; the visual metering window 11 is located on the right side of the "well"-shaped inner cavity; the inlet end of the back pressure valve 16 is connected to the high-pressure gas-containing crude oil outlet pipeline 15 and the high-temperature and high-pressure water outlet pipeline 7, and the outlet end is connected to a collecting container 17.

[0051] The "well"-shaped inner cavity designed inside the high-temperature and high-pressure visual gas-containing crude oil / water metering device has two interfaces for cavity cleaning on the left and right sides of the device. The cleaning pipeline needs to be connected to clean the inner cavity before and after the experiment. The high-pressure gas-containing crude oil inlet and outlet pipelines are connected to the upper part of the inner cavity of the oil-water metering device and are controlled by valves respectively. The high-temperature and high-pressure water inlet and outlet pipelines are connected to the lower part of the inner cavity of the oil-water metering device and are also controlled by valves for switching. The visual oil and water metering window is located on the right side of the "well"-shaped inner cavity. It is inlaid with sapphire glass. The side of the window is engraved with scales for oil and water metering, which can withstand a pressure of 50MPa. The back pressure P applied by the back pressure valve simulates the reservoir pressure. The inlet end is connected to the high-pressure gas-containing crude oil outlet pipe and the high-temperature and high-pressure water outlet pipe, and the outlet end is connected to a collection container.

[0052] When the valves of the high-pressure gas-containing crude oil inlet and outlet pipelines are opened, and the valves of the high-temperature and high-pressure water inlet and outlet pipelines are closed, a "U"-shaped pipe structure is formed. Conversely, when the valves of the high-temperature and high-pressure water inlet and outlet pipelines are opened, and the high-pressure gas-containing crude oil inlet and outlet pipelines are closed, an inverted "U"-shaped pipe structure is formed. The visual metering window is made of sapphire and is located on the right side of the "well"-shaped inner cavity. The window is engraved with scales for metering. There is a cleaning interface on both sides of the "well"-shaped cavity, which is sealed with a dead plug during use. After the experiment is over, the inner cavity can be cleaned by connecting the pipe. The back pressure valve is connected to the gas-containing crude oil outlet pipe and the high-temperature and high-pressure water outlet pipe to ensure the pressure of the oil-water system during the experiment. Put the entire set of oil-water metering device into an oven, and visual oil-water metering under high temperature and high pressure conditions can be performed.

[0053] During the establishment of the initial oil-water interface in the inner cavity of the metering device, close the valves 2 and 14 corresponding to the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 and outlet pipe 15, open the valve 5 corresponding to the high-temperature and high-pressure water inlet pipe 6 and close the valve 8 corresponding to the high-temperature and high-pressure water outlet pipeline 7. Inject water to 2 / 3 of the scale of the visualization window 11 of the oil-water metering device under normal pressure conditions, and close the valve 5 corresponding to the high-temperature and high-pressure water inlet pipeline 6.

[0054] The valve 2 corresponding to the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 is opened when the volume of normal-pressure water in the oil-water metering device reaches 2 / 3 of the volume of the cavity, and the valve 14 corresponding to the high-temperature and high-pressure gas-containing crude oil outlet pipe 15 is opened at the same time, and the crude oil under normal pressure is injected into the inner cavity of the metering device through the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 until the remaining 1 / 3 of the inner cavity of the metering device is filled, and then the valves 2 and 14 corresponding to the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 and outlet pipe 15 are closed. At this time, the initial oil-water interface in the inner cavity of the oil-water metering device under normal pressure is established.

[0055] The core (pore volume V0) saturated with simulated formation water is loaded into the core displacement device, the outlet pipeline of the displacement device is connected to the high-temperature and high-pressure water inlet pipeline 6, the back pressure of the back pressure valve 16 of the oil-water metering device is increased to the experimental pressure P, and the liquid collection container 17 is placed at the outlet.

[0056] The valves 5 and 8 corresponding to the high-temperature and high-pressure water inlet pipe 6 and outlet pipeline 7 of the oil-water metering device are both opened, and simulated formation water is used to displace the core until simulated formation water is collected in the liquid collection container 17. At this time, the initial oil-water interface in the inner cavity of the oil-water dosing device under high-temperature and high-pressure conditions is established, and the position of the oil-water interface on the visualization window 11 at this time is recorded as V1.

[0057] After the initial oil-water interface is established under high temperature and high pressure conditions, high temperature and high pressure gas-containing crude oil is used to displace the saturated water in the core, establish the original oil saturation, and determine the bound water saturation. Close the valves 5 and 7 corresponding to the inlet pipe 6 and outlet pipe 7 of the high temperature and high pressure water, and open the valves 2 and 14 corresponding to the inlet pipe 1 and outlet pipe 15 of the high temperature and high pressure gas-containing crude oil.

[0058] After the high-temperature and high-pressure gas-containing crude oil displaces the saturated water in the core through the inlet pipe 1 and enters the inner cavity of the oil-water metering device, the high-temperature and high-pressure gas-containing crude oil falls into the cavity of the metering device due to the gravity separation of oil and water. The high-temperature and high-pressure gas-containing crude oil passes through the back pressure valve 16 from the outlet pipe 15 and enters the collection container 17. After the visualization window 11 shows that the oil-water interface is stable, the valves 2 and 14 corresponding to the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 and outlet pipe 15 are closed, and it is recorded that the oil-water interface rises to a volume V2 at this time, then V2-V1 is the measured volume of the driven water, and the volume of the bound water is V0-(V2-V1).

[0059] After the oil drive core is saturated with water and the irreducible water saturation is determined, the high-temperature and high-pressure water drive stage of high-temperature and high-pressure gas-bearing crude oil is entered. The valves 5 and 8 corresponding to the high-temperature and high-pressure water inlet pipe 6 and outlet pipe 7 are opened.

[0060] After the high-temperature and high-pressure water displaces the saturated high-temperature and high-pressure gas-bearing oil in the core through the inlet pipe 6 and enters the inner cavity of the metering device, the oil floats up and gathers and remains in the inner cavity due to the gravity separation of oil and water, and the high-temperature and high-pressure water enters the collection container 17 through the outlet pipeline 7 and the back pressure valve 16. After the visualization window 11 shows that the oil-water interface drops and reaches a certain volume V3, the valves 5 and 8 corresponding to the high-temperature and high-pressure water inlet pipe 6 and outlet pipe 7 are closed. At this time, the water saturation S before the core decompression and degassing is established in the core. 脱气前 =[(V2-V3)+(V0-V2+V1)] / V0×100%.

[0061] The water saturation before depressurization is S 脱气前 The core simulates the depressurization process of the core from the bottom of the well to the ground. The water saturation S of the core after depressurization and degassing is determined by indoor routine core analysis. 脱气后 , then the saturation loss caused by core decompression and degassing is ΔS = S 脱气前 -S 脱气后 .

[0062] After the experiment is completed, clean the inner cavity of the oil-water metering device. The cleaning interfaces 3, 4, 9 and 13 are combined in pairs, two of which are kept open and the remaining two interfaces are closed, and cleaned with a cleaning agent under high temperature conditions.

[0063] like Figure 3 As shown, Figure 3 This is a flow chart of a specific embodiment of the experimental method for determining the compressibility coefficient of reservoir rock during multiple rounds of injection and production of a gas storage facility of the present invention. The process includes:

[0064] 1. Connect the metering device to the core displacement device

[0065] First, the water-saturated core is loaded into the displacement device, and the outlet pipe of the displacement device is connected to the high-temperature and high-pressure inlet pipeline of the oil-water metering device.

[0066] 2. Establish the initial oil-water interface in the inner cavity

[0067] Open the valve of the high-temperature and high-pressure water inlet pipeline, close the valve of the outlet pipeline, close the valves of the high-temperature and high-pressure gas-bearing crude oil inlet and outlet pipelines, drive the simulated formation water to 2 / 3 of the volume of the oil-water metering cavity under normal pressure, and close the valve of the high-temperature and high-pressure water inlet pipeline. Then, open the valves of the high-temperature and high-pressure gas-bearing crude oil inlet and outlet pipelines to allow the crude oil to fill the cavity of the oil-water metering device under normal pressure.

[0068] 3. Raise the oven temperature where the oil-water metering device is placed to the experimental temperature, and raise the pressure of the back pressure valve to the experimental pressure. Use high-temperature and high-pressure simulated formation water to displace the core. At this time, keep the valves of the inlet and outlet pipelines of the high-temperature and high-pressure gas-bearing crude oil closed, open the valves of the inlet and outlet pipelines of the high-temperature and high-pressure water, and when liquid flows out of the collection container, establish the oil-water interface under the high-temperature and high-pressure state, and record the volume V1 corresponding to the oil-water interface in the oil-water metering visualization window.

[0069] 4. Measure the water output from oil-driven cores and determine the bound water volume

[0070] After the initial oil-water interface is established under high temperature and high pressure conditions, high temperature and high pressure gas-containing crude oil is used to displace the saturated water in the core, establish the original oil saturation, and determine the bound water saturation. Close the inlet and outlet valves of the high temperature and high pressure water, open the inlet and outlet valves of the high temperature and high pressure gas-containing crude oil, and perform oil-water displacement. Due to the gravity separation of oil and water, the displaced water falls into the inner cavity of the metering device, causing the oil-water interface in the cavity to rise, and the high temperature and high pressure gas-containing crude oil enters the collection container through the outlet pipeline and the back pressure valve. After the oil-water interface is stable, close the inlet and outlet pipelines of the high temperature and high pressure gas-containing crude oil, and record the volume V2 corresponding to the oil-water interface in the visualization window at this time. The volume of bound water is V0-(V2-V1).

[0071] 5. Measure the oil output of the water-driven core and establish the water saturation of the core before depressurization and degassing

[0072] Open the valves of the high-temperature and high-pressure water inlet and outlet pipelines to carry out the high-temperature and high-pressure water displacement of the high-temperature and high-pressure gas-bearing crude oil in the core. Due to the gravity differentiation of oil and water, the high-temperature and high-pressure gas-bearing crude oil displaced from the core floats up and remains in the inner cavity of the oil-water metering device, causing the oil-water interface in the cavity to drop. After the visualization window shows that the oil-water interface reaches a certain volume V3, close the high-temperature and high-pressure water inlet and outlet valves. At this time, the water saturation S before the core decompression and degassing is established in the core. 脱气前 =[(V2-V3)+(V0-V2+V1)] / V0×100%.

[0073] The water saturation before depressurization is S 脱气前 The core simulates the depressurization process of the core from the bottom of the well to the ground. The water saturation S of the core after depressurization and degassing is determined by indoor routine core analysis. 脱气后 , then the saturation loss caused by core decompression and degassing is ΔS = S 脱气前 -S 脱气后 .

[0074] 6. Clean the inner cavity of the metering device

[0075] After the experiment is completed, clean the inner cavity of the oil-water metering device. Use the left and right ports of the upper horizontal metering channel and the left and right ports of the lower horizontal metering channel in pairs, keep two of the ports open, and close the remaining two ports, and clean them with a cleaning agent under high temperature conditions.

[0076] The high-temperature and high-pressure visual oil-water metering device of the embodiment of the present invention can be used to accurately establish the water saturation in the core before depressurization and degassing by measuring the volume of high-temperature and high-pressure oil and water when conducting a water saturation correction experiment in a core chamber of a closed coring well using live oil. The core can be used for subsequent simulation of the depressurization and degassing process of the core from the bottom of the well to the ground. In this process, water is lost due to the decrease in pressure and temperature and the expansion of the oil, water and core volume. The amount of water lost plus the indoor measurement of the water saturation of the closed coring well can obtain the accurate water saturation at the coring point in the actual reservoir, and can more accurately determine the degree of flooding and the remaining oil saturation of the reservoir, thereby providing a basis for improving the recovery rate and oil field adjustment measures in the later stage of oil field development.

[0077] Embodiment 2:

[0078] See also Figures 1 to 3 , the present invention provides a technical solution:

[0079] A high-temperature and high-pressure visualized oil-water metering device comprises a metering body, wherein the metering body is provided with a metering cavity, and the metering cavity is a tic-tac-toe-shaped channel inner cavity interconnected with each other, that is, the tic-tac-toe-shaped channel inner cavity comprises an upper horizontal metering channel, a lower horizontal metering channel, a left vertical metering channel, and a right vertical metering channel.

[0080] Furthermore, both left and right ports of the upper horizontal metering channel are equipped with plugging parts, namely, dead plugs 3 and 13, and both left and right ports of the lower horizontal metering channel are also equipped with plugging parts, namely, dead plugs 4 and 9; the upper port of the left longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 through a joint, the lower port of the left longitudinal metering channel is connected to the high-temperature and high-pressure water inlet pipe 6 through a joint, the upper port of the right longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing oil outlet pipe 15 through a joint, and the lower port of the right longitudinal metering channel is connected to the high-temperature and high-pressure water outlet pipe 7 through a joint.

[0081] Furthermore, the outlet of the high-temperature and high-pressure gas-containing oil outlet pipe and the outlet of the high-temperature and high-pressure water outlet pipe are both connected to the inlet of the back-pressure valve 16 , and the outlet of the back-pressure valve is connected to the liquid collection container 17 .

[0082] Furthermore, the high-temperature and high-pressure gas-containing crude oil inlet pipe, the high-temperature and high-pressure water inlet pipe, the high-temperature and high-pressure gas-containing oil outlet pipe, and the high-temperature and high-pressure water outlet pipe are all installed with valves.

[0083] Furthermore, the metering body is made of a transparent material. This solution is more visually pleasing, and the transparent material that is resistant to high pressure and high temperature can be directly used. This material in the prior art is a well-known technology.

[0084] Embodiment 3:

[0085] See also Figures 1 to 3 , the present invention provides a technical solution:

[0086] A high-temperature and high-pressure visualized oil-water metering device comprises a metering body, wherein the metering body is provided with a metering cavity, and the metering cavity is a tic-tac-toe-shaped channel inner cavity interconnected with each other, that is, the tic-tac-toe-shaped channel inner cavity comprises an upper horizontal metering channel, a lower horizontal metering channel, a left vertical metering channel, and a right vertical metering channel.

[0087] Furthermore, both left and right ports of the upper horizontal metering channel are equipped with plugging parts, namely, dead plugs 3 and 13, and both left and right ports of the lower horizontal metering channel are also equipped with plugging parts, namely, dead plugs 4 and 9; the upper port of the left longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing crude oil inlet pipe 1 through a joint, the lower port of the left longitudinal metering channel is connected to the high-temperature and high-pressure water inlet pipe 6 through a joint, the upper port of the right longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing oil outlet pipe 15 through a joint, and the lower port of the right longitudinal metering channel is connected to the high-temperature and high-pressure water outlet pipe 7 through a joint.

[0088] Furthermore, the outlet of the high-temperature and high-pressure gas-containing oil outlet pipe and the outlet of the high-temperature and high-pressure water outlet pipe are both connected to the inlet of the back-pressure valve 16 , and the outlet of the back-pressure valve is connected to the liquid collection container 17 .

[0089] Furthermore, the high-temperature and high-pressure gas-containing crude oil inlet pipe, the high-temperature and high-pressure water inlet pipe, the high-temperature and high-pressure gas-containing oil outlet pipe, and the high-temperature and high-pressure water outlet pipe are all installed with valves.

[0090] Although all the above embodiments use Figures 1 to 3 However, as a person skilled in the art can clearly know, there is no need to provide a separate drawing to represent, as long as the missing parts or structural features in the embodiment are removed from the drawing. This is clear to those skilled in the art. Of course, the embodiment with more parts is only the optimal embodiment, and the embodiment with fewer parts is the basic embodiment, but it can also achieve the basic purpose of the invention, so all of them are within the scope of protection of the present invention.

[0091] All parts and components not discussed in detail in this application and the connection methods of the parts and components in this application belong to the well-known technology in this technical field and will not be described in detail, such as welding, threaded connection, etc.

[0092] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0093] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0094] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-temperature and high-pressure visual oil-water metering device, comprising a metering body, wherein the metering body is provided with a metering cavity, characterized in that: The metering cavity is a mutually connected tic-tac-toe channel inner cavity, that is, the tic-tac-toe channel inner cavity includes an upper horizontal metering channel, a lower horizontal metering channel, a left vertical metering channel, and a right vertical metering channel; The metering body is made of metal, and is provided with a window, which is connected to the right longitudinal metering channel, and a visual window is installed in a sealed manner on the window; The window of the metering body is engraved with scales for oil and water metering. The pressure resistance of the inner cavity of the tic-tac-toe channel and the pressure resistance of the visualization window are both 50MPa, and the high temperature resistance of the inner cavity of the tic-tac-toe channel and the high temperature resistance of the visualization window are both 100°C. The left and right ports of the upper horizontal metering channel are both equipped with plugging pieces, and the left and right ports of the lower horizontal metering channel are also equipped with plugging pieces; the upper port of the left longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing crude oil inlet pipe through a joint, the lower port of the left longitudinal metering channel is connected to the high-temperature and high-pressure water inlet pipe through a joint, the upper port of the right longitudinal metering channel is connected to the high-temperature and high-pressure gas-containing oil outlet pipe through a joint, and the lower port of the right longitudinal metering channel is connected to the high-temperature and high-pressure water outlet pipe through a joint; The outlet of the high-temperature and high-pressure gas-containing oil outlet pipe and the outlet of the high-temperature and high-pressure water outlet pipe are both connected to the inlet of the back-pressure valve, and the outlet of the back-pressure valve is connected to the liquid collection container; The high-temperature and high-pressure gas-containing crude oil inlet pipe, the high-temperature and high-pressure water inlet pipe, the high-temperature and high-pressure gas-containing oil outlet pipe, and the high-temperature and high-pressure water outlet pipe are all equipped with valves; The measuring body is made of transparent material.

2. A high temperature and high pressure visual oil-water metering device according to claim 1, characterized in that: The visualization window is made of sapphire glass and is sealed and embedded on the window.

3. A metering method using the high temperature and high pressure visual oil-water metering device according to claim 1, characterized in that: In step 1, firstly, the water-saturated core is loaded into the displacement device, and the outlet of the displacement device is connected to the high-temperature and high-pressure inlet pipeline of the oil-water metering device; In step 2, an initial oil-water interface in the inner cavity is established; the valve of the high-temperature and high-pressure water inlet pipeline is opened, the valve of the outlet pipeline is closed, the valves of the high-temperature and high-pressure gas-containing crude oil inlet and outlet pipelines are closed, and the simulated formation water is driven out to 2 / 3 of the volume of the oil-water metering cavity under normal pressure, and the valve of the high-temperature and high-pressure water inlet pipeline is closed; then, the valves of the high-temperature and high-pressure gas-containing crude oil inlet and outlet pipelines are opened to allow the crude oil to fill the cavity of the oil-water metering device under normal pressure; In step 3, water-driven cores are used to establish high temperature and high pressure conditions of the experimental system; the temperature of the oven where the oil-water metering device is placed is raised to the experimental temperature, and the pressure of the back pressure valve is raised to the experimental pressure; high temperature and high pressure simulated formation water is used to displace the cores, at this time, the valves of the inlet and outlet pipelines of the high temperature and high pressure gas-containing crude oil are kept closed, and the valves of the inlet and outlet pipelines of the high temperature and high pressure water are opened. When liquid flows out of the collection container, an oil-water interface under high temperature and high pressure is established, and the volume V1 corresponding to the oil-water interface in the oil-water metering visualization window is recorded; In step 4, the water output of the oil-driven core is measured to determine the bound water volume; after the initial oil-water interface is established under high temperature and high pressure conditions, the saturated water in the core is displaced by high temperature and high pressure gas-containing crude oil to establish the original oil saturation and determine the bound water saturation; the inlet and outlet valves of the high temperature and high pressure water are closed, and the inlet and outlet valves of the high temperature and high pressure gas-containing crude oil are opened to drive the oil into the water; due to the gravity separation of oil and water, the driven water falls into the inner cavity of the metering device, causing the oil-water interface in the cavity to rise, and the high temperature and high pressure gas-containing crude oil enters the collection container through the outlet pipeline and the back pressure valve, and after the oil-water interface is stable, the inlet and outlet pipelines of the high temperature and high pressure gas-containing crude oil are closed, and the volume V2 corresponding to the oil-water interface in the visualization window is recorded at this time, and the volume of the bound water is V0-(V2-V1); In step 5, the water-driven core is measured for oil output to establish the water saturation of the core before depressurization and degassing; the valves of the high-temperature and high-pressure water inlet and outlet pipelines are opened to carry out the high-temperature and high-pressure water drive stage for high-temperature and high-pressure gas-bearing crude oil in the core; due to the gravity differentiation of oil and water, the high-temperature and high-pressure gas-bearing crude oil displaced from the core floats up and remains in the inner cavity of the oil-water metering device, causing the oil-water interface in the cavity to drop. After the visualization window shows that the oil-water interface reaches a certain volume V3, the high-temperature and high-pressure water inlet and outlet valves are closed. At this time, the water saturation before depressurization and degassing of the core is established in the core. 脱气前 =[(V2-V3)+(V0-V2+V1)] / V0×100%; the water saturation before depressurization is s 脱气前 The core simulates the depressurization process of the core from the bottom of the well to the ground. The water saturation s of the core after depressurization and degassing is determined by indoor routine core analysis. 脱气后 , then the saturation loss caused by core decompression and degassing is ΔS = S 脱气前 -S 脱气后 ; In step 6, clean the inner cavity of the metering device; after the experiment is completed, clean the inner cavity of the oil-water metering device; use the left and right ports of the upper horizontal metering channel and the left and right ports of the lower horizontal metering channel in pairs for cleaning, keep two of the interfaces open, and close the remaining two interfaces, and clean them with a cleaning agent under high temperature conditions.

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