Oil-water relative permeability test method, device, storage medium and electronic equipment
Patent Information
- Application Number
- CN202510190115.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-08-21
AI Technical Summary
2021-2022年HB油田在深部地层连续取得重大突破，其中，XH区块作为上产的主要区块，具有储层埋藏深度大，原油凝固点高的特点，该类型油藏在国内外尚无成熟的高效开发经验
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Figure CN122612430A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil and gas exploration technology, and in particular to a method, apparatus, storage medium and electronic equipment for testing the relative permeability of oil and water at different temperatures in ultra-deep high-pour-point oil reservoirs. Background Technology
[0002] Accelerating the exploration and development of deep and ultra-deep oil and gas reservoirs has become an inevitable strategic choice for China's onshore oil and gas exploration and development. From 2021 to 2022, the HB oilfield achieved significant breakthroughs in deep formations. Among them, the XH block, as a major producing block, is characterized by its deep reservoir burial and high crude oil pour point. There is currently no mature and efficient development experience for this type of reservoir both domestically and internationally. For ultra-deep high-pour-point reservoirs, the high content of asphaltene, resin, and wax in the formation crude oil leads to a high pour point, making it difficult to flow at room temperature and hindering the testing of seepage patterns. To improve recovery, water injection is necessary for this type of reservoir. However, this replenishment of energy causes changes in formation temperature. Therefore, it is urgent to conduct relative permeability tests of the oil-water two-phase flow at different temperatures to study the impact of temperature on the seepage patterns of high-pour-point reservoirs, providing a foundation for subsequent development planning and dynamic prediction.
[0003] In related technologies, oil-water two-phase relative permeability testing experiments mainly include steady-state and non-steady-state testing methods. The steady-state method involves simultaneously injecting oil and water into the rock sample at a constant rate and ratio under constant total flow conditions. Using the measured inlet and outlet pressures, as well as the oil and water flow rates, Darcy's law is used to directly calculate the effective and relative permeability values of the rock sample. This method is relatively simple to calculate, but the experimental process is complex, and it is more commonly used in cores with generally good permeability. For cores with strong heterogeneity and low permeability, the cumbersome process... Experimental procedures, measurement conditions, and complex pore structures can significantly affect experimental results. Therefore, unsteady-state testing methods are often used. For example, two identical cylindrical quartz glasses can be used to simulate the pore structure of a real core. Microscopic visualization and image processing techniques can be used to quantitatively obtain the oil-water occurrence characteristics and oil-water two-phase flow characteristics within the visualization model. However, cylindrical quartz glasses are difficult to characterize the complex and diverse pore structures of a real core, resulting in differences from the actual reservoir conditions and lower accuracy of the calculated relative permeability values.
[0004] Existing methods are insufficient for testing the oil-water two-phase flow in ultra-deep, high-pour-point reservoirs, either because they fail to consider the impact of temperature changes on the flow or because they do not accurately reflect the actual flow conditions in the reservoir, resulting in weak representativeness of the experimental results. Therefore, it is necessary to develop a method for testing the relative permeability of oil and water at different temperatures. This method would enable the testing of the relative permeability of oil and water in real core samples at different temperatures. During multiple experiments, the core samples could be cleaned and dried without disassembling intermediate containers. Furthermore, the oil and water could be directly separated at the outlet using a superhydrophilic semi-permeable membrane, eliminating the need for centrifugation and re-measurement. This method could provide a reference and data foundation for the development and numerical simulation of ultra-deep, high-pour-point reservoirs. Summary of the Invention
[0005] In view of this, the present invention provides a method, apparatus, storage medium and electronic device for testing the relative permeability of oil and water phases at different temperatures.
[0006] Specifically, the present invention is achieved through the following technical solution:
[0007] According to a first aspect of the present invention, an oil-water phase relative permeability testing device at different temperatures is provided. The oil-water phase relative permeability testing method includes: a first three-way valve, a second three-way valve, a first intermediate container assembly, a second intermediate container assembly, a channel switch assembly, a sixth three-way valve, a seventh three-way valve, a pressure sensing assembly, a constant temperature chamber, a core clamping assembly, a displacement pump assembly, a back pressure valve, a metering assembly, and an information processor, wherein...
[0008] The displacement pump assembly includes: a first displacement pump, a second displacement pump, a third displacement pump, and a fourth displacement pump;
[0009] The first displacement pump is connected to the input end of the first intermediate container assembly via a first three-way valve;
[0010] The second displacement pump is connected to the input end of the second intermediate container assembly via a second three-way valve;
[0011] The output ends of the first intermediate container assembly and the second intermediate container assembly are respectively connected to the sixth three-way valve through the channel switch assembly;
[0012] The sixth three-way valve is also connected to the core clamping assembly;
[0013] The core clamping assembly is also connected to the seventh three-way valve, which is also connected to the back pressure valve, which is also connected to the metering assembly.
[0014] The second intermediate container assembly, core clamping assembly, sixth three-way valve, seventh three-way valve, pressure sensing assembly, and back pressure valve are installed in the constant temperature chamber;
[0015] The pressure sensing assembly includes: an inlet force sensor, an outlet pressure sensor, and a confining pressure sensor;
[0016] The inlet force sensor is installed in the line between the channel switch assembly and the sixth three-way valve;
[0017] The outlet pressure sensor is installed in the line between the core clamping assembly and the seventh three-way valve;
[0018] The confining pressure sensor is installed in the line between the sixth three-way valve and the seventh three-way valve;
[0019] The pressure sensing components and metering components are also connected to the information processor;
[0020] The third displacement pump is connected to the back pressure valve, and the fourth displacement pump is connected to the core clamping assembly.
[0021] Optionally, the first displacement pump is connected to the first end of the first three-way valve; the second and third ends of the first three-way valve are respectively connected to the input end of the first intermediate container and the input end of the second intermediate container, and the second and third ends of the first three-way valve are located on the same side.
[0022] Optionally, the channel switch assembly includes: a third three-way valve, a fourth three-way valve, and a fifth three-way valve, wherein,
[0023] The output end of the first intermediate container is connected to the first end of the third three-way valve, and the output end of the second intermediate container is connected to the second end of the third three-way valve. The second end and the first end of the third three-way valve are located on the same side.
[0024] The third end of the third three-way valve is connected to the first end of the fourth three-way valve;
[0025] The third end of the fourth three-way valve is connected to the inlet end of the core clamping assembly;
[0026] The output end of the third intermediate container is connected to the first end of the fifth three-way valve, and the output end of the fourth intermediate container is connected to the second end of the fifth three-way valve. The first and second ends of the fifth three-way valve are located on the same side.
[0027] The third end of the fifth three-way valve is connected to the second end of the fourth three-way valve, and the first and second ends of the fourth three-way valve are located on the same side.
[0028] Optionally, the third end of the fourth three-way valve is connected to the input end of the inlet pressure sensor; the output end of the inlet pressure sensor is connected to the first end of the sixth three-way valve; the second end of the sixth three-way valve is connected to the input end of the confining pressure sensing device; the third end of the sixth three-way valve is connected to the inlet end of the core clamping assembly; and the first and second ends of the sixth three-way valve are located on the same side.
[0029] The output end of the confining pressure sensor is connected to the first end of the seventh three-way valve.
[0030] The third end of the seventh three-way valve is connected to the input end of the outlet pressure sensor;
[0031] The output end of the pressure sensor at the outlet end is connected to the outlet end of the core clamping assembly.
[0032] Optionally, the core clamping assembly includes: a core clamp, a first end cap, a hydraulic oil cavity, and a second end cap, wherein,
[0033] The core holder is used to hold the core sample and is set in the hydraulic oil cavity. The first end cover is the inlet end of the core holding assembly, and the second end cover is the outlet end of the core holding assembly. The first end cover and the second end cover form the hydraulic oil cavity through the sealing ring and the thread.
[0034] Optionally, the metering assembly includes: a first graduated cylinder, a superhydrophilic semi-permeable membrane, a second graduated cylinder, and a test tube rack, wherein,
[0035] The first graduated cylinder is connected to the fluid outlet end of the back pressure valve, the first graduated cylinder is connected to the second graduated cylinder, the superhydrophilic semipermeable membrane is placed between the first graduated cylinder and the second graduated cylinder, and the test tube rack is connected to the second graduated cylinder.
[0036] Optionally, the second displacement pump is connected to the first end of the second three-way valve; the second and third ends of the second three-way valve are respectively connected to the input end of the third intermediate container and the input end of the fourth intermediate container, and the second and third ends of the second three-way valve are located on the same side.
[0037] According to a second aspect of the present invention, a method for testing the relative permeability of an oil-water phase is provided, the method comprising:
[0038] Obtain core samples from the target area, load them into the core clamping assembly, and saturate the core samples with formation water according to the mineralization of the formation water in the target area.
[0039] An airtightness test sample is placed in the second intermediate container. A channel is set up between the first displacement pump, the first three-way valve, the second intermediate container, the channel switch assembly, the inlet pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve to form an airtightness verification channel, so that the airtightness test sample is driven by the first displacement pump to perform airtightness verification.
[0040] A cleaning sample is placed in the first intermediate container. A cleaning channel is formed between the first displacement pump, the first three-way valve, the first intermediate container, the channel switch assembly, the inlet pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve. The cleaning sample is driven by the first displacement pump to clean the core sample.
[0041] Close the cleaning channel and open the airtightness verification channel to obtain the physical parameter values of the core sample;
[0042] Set up a vacuum environment for the core clamping assembly, use the fourth displacement pump to inject hydraulic oil into the hydraulic oil chamber of the core clamping assembly to a preset pressure threshold, and use the third displacement pump to set the back pressure value of the back pressure valve to a preset back pressure threshold that is lower than the pressure threshold.
[0043] The core sample is filled with saturated formation water in the fourth intermediate container. A channel is set up between the second displacement pump, the second three-way valve, the fourth intermediate container, the channel switch assembly, the inlet pressure sensor, the confining pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve. The second displacement pump drives the saturated formation water in the core sample to be injected into the core clamping assembly to establish an experimental environment that meets the pre-set pressure conditions.
[0044] Crude oil collected from the target area is loaded into the third intermediate container. A second displacement pump, a second three-way valve, a third intermediate container, a channel switch assembly, an inlet pressure sensor, a confining pressure sensor, a core clamping assembly, an outlet pressure sensor, a seventh three-way valve, and a back pressure valve are set up to drive the crude oil into the core clamping assembly to establish an experimental environment that meets the pre-set bound water conditions. The water saturation and effective permeability of the oil phase under the bound water conditions are calculated.
[0045] The pressure inside the fourth intermediate container is set higher than the pre-set pressure threshold at the inlet of the core clamping assembly. The channel of the third intermediate container is closed, and the channel from the fourth intermediate container to the metering assembly is opened. The core sample is then saturated with formation water to conduct a water-drive oil phase permeability test via the second displacement pump. Based on the water-drive oil phase permeability test value, physical parameter value, water saturation under bound water conditions, and effective oil phase permeability, the water-drive oil phase permeability test parameter value is obtained.
[0046] According to a third aspect of the present invention, a storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the oil-water phase relative permeability testing method in any possible implementation of the first aspect.
[0047] According to a fourth aspect of the present invention, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the oil-water phase relative permeability testing method in any possible implementation of the first aspect. Attached Figure Description
[0048] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.
[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.
[0050] Figure 1 This is a schematic diagram of the structure of an oil-water phase relative permeability testing device provided in an embodiment of the present invention;
[0051] Figure 2 The embodiments of the present invention are based on Figure 1 A schematic diagram of the process for testing the relative permeability of oil and water phases;
[0052] Figure 3 The embodiments of the present invention are based on Figure 1 Another flowchart illustrating the oil-water phase relative permeability test method;
[0053] Figure 4 This is a schematic diagram showing the relationship between the relative permeability of the oil phase and the water saturation in an embodiment of the present invention.
[0054] Figure 5 This is a schematic diagram showing the relationship between the relative permeability of the aqueous phase and the water saturation in an embodiment of the present invention.
[0055] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.
[0056] Explanation of the numbers in the diagram: 1—First displacement pump; 2—Second displacement pump; 21—Third displacement pump; 28—Fourth displacement pump; 01—First intermediate container assembly; 02—Second intermediate container assembly; 5—First intermediate container; 6—Second intermediate container; 7—Third intermediate container; 8—Fourth intermediate container; 03—Channel switch assembly; 3—First three-way valve; 4—Second three-way valve; 9—Third three-way valve; 10—Fourth three-way valve; 11—Fifth three-way valve; 04—Core clamping assembly; 14—First end face cover; 17—Second end face cover; 16—Hydraulic oil chamber; 12—Inlet end force sensor; 15—Confining pressure sensor; 18—Outlet end pressure sensor; 20—Back pressure valve; 05—Metering assembly; 22—First measuring cylinder; 23—Hydrophilic semi-permeable membrane; 24—Second measuring cylinder; 25—Test tube rack; 26—Information processor; 27—Constant temperature chamber. Detailed Implementation
[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0058] In related technologies, for cores with relatively good permeability (i.e., high homogeneity and low permeability), a steady-state testing method is generally used. Under the condition of constant total flow rate, oil and water are simultaneously injected into the rock sample at a constant rate according to a certain flow ratio. The effective permeability and relative permeability of the rock sample are directly calculated based on Darcy's law using the measured inlet and outlet pressures, oil flow rate, and water flow rate. For cores with high heterogeneity and low permeability, a non-steady-state testing method is used. A cylindrical quartz glass is used to simulate the pore structure of the real rock sample. Microscopic visualization technology and image processing technology are used to quantitatively obtain the oil-water occurrence characteristics and oil-water two-phase flow characteristics within the visualization model. However, since cylindrical quartz glass is difficult to characterize the complex and diverse pore structure of the real rock sample, there are differences from the actual reservoir conditions, resulting in lower accuracy of the calculated relative permeability values.
[0059] This embodiment provides a high-temperature, high-pressure, high-pour-point oil unsteady-state oil-water phase permeability testing device and method. By considering the influence of temperature changes on the flow of high-pour-point oil and water two phases, it realizes the testing of the relative permeability of oil and water two phases in real core samples at different temperatures. During multiple sets of experiments, the core samples can be cleaned and dried without disassembling intermediate containers. Furthermore, the oil and water are directly separated at the outlet through a superhydrophilic semi-permeable membrane, eliminating the need for centrifugation and re-measurement. This improves the accuracy of the relative permeability values obtained from the test. The testing principle is reliable, the operation is simple, and the applicability is strong. It can provide more accurate basic data for water-drive development of ultra-deep high-pour-point oil reservoirs and reservoir numerical simulation.
[0060] See Figure 1 This invention provides an oil-water phase relative permeability testing device, such as... Figure 1 As shown, the oil-water phase relative permeability testing device is a high-temperature, high-pressure, high-pour-point oil unsteady-state oil-water phase permeability testing device, including: a first three-way valve 3, a second three-way valve 4, a first intermediate container assembly 01, a second intermediate container assembly 02, a channel switch assembly 03, a sixth three-way valve 13, a seventh three-way valve 19, a pressure sensing assembly, a constant temperature chamber 27, a core clamping assembly 04, a displacement pump assembly, a back pressure valve 20, a metering assembly 05, and an information processor 26.
[0061] The displacement pump assembly includes: a first displacement pump 1, a second displacement pump 2, a third displacement pump 21, and a fourth displacement pump 28;
[0062] The first displacement pump 1 is connected to the input end of the first intermediate container assembly 01 via the first three-way valve 3;
[0063] The second displacement pump 2 is connected to the input end of the second intermediate container assembly 02 via the second three-way valve 4;
[0064] The output ends of the first intermediate container assembly 01 and the second intermediate container assembly 02 are respectively connected to the sixth three-way valve 13 through the channel switch assembly 03.
[0065] The sixth three-way valve 13 is also connected to the core clamping assembly 04;
[0066] The core clamping assembly 04 is also connected to the seventh three-way valve 19, which is also connected to the back pressure valve 20. The back pressure valve 20 is also connected to the metering assembly 05.
[0067] The second intermediate container assembly 02, the core clamping assembly 04, the sixth three-way valve 13, the seventh three-way valve 19, the pressure sensing assembly, and the back pressure valve 20 are installed in the constant temperature chamber 27;
[0068] The pressure sensing assembly includes: an inlet force sensor 12, an outlet pressure sensor 18, and a confining pressure sensor 15;
[0069] The inlet force sensor 12 is installed on the line between the channel switch assembly 03 and the sixth three-way valve 13;
[0070] The outlet pressure sensor 18 is installed on the line between the core clamping assembly 04 and the seventh three-way valve 19;
[0071] The confining pressure sensor 15 is installed on the line between the sixth three-way valve 13 and the seventh three-way valve 19;
[0072] The pressure sensing component and metering component 05 are also connected to the information processor 26;
[0073] The third displacement pump 21 is connected to the back pressure valve 20, and the fourth displacement pump 28 is connected to the core clamping assembly 04.
[0074] Figure 2 The embodiments of the present invention are based on Figure 1 A schematic diagram of the process for testing the relative permeability of oil and water phases. (See attached diagram.) Figure 2 As shown, in this embodiment, as an optional implementation, the method includes:
[0075] S101. Obtain a core sample from the target area, load it into the core clamping assembly, and prepare the core sample to be saturated with formation water according to the mineralization of the formation water in the target area.
[0076] In this embodiment, the core sample from the target area is a highly heterogeneous core with low permeability.
[0077] S102. An airtightness test sample is placed in the second intermediate container. A channel is set between the first displacement pump, the first three-way valve, the second intermediate container, the channel switch assembly, the inlet pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve to form an airtightness verification channel, so as to drive the airtightness test sample through the first displacement pump for airtightness verification.
[0078] In this embodiment, the airtightness is tested by sequentially connecting the above-mentioned components, adjusting the first displacement pump 1 to a constant speed mode of 0.125 ml / min, using an airtightness test sample, such as nitrogen, for displacement, and placing the outlet pipeline of the core clamping assembly 04 in water. When continuous bubbles appear, foaming agent or soapy water is applied to each connection point to check whether bubbles are generated at the connection points of each pipeline, the connection point of the three-way valve, the end face of the core clamp, and the connection point of the back pressure valve. If no bubbles are generated at each connection point and end face, and the pressure data remain stable, it proves that the airtightness is good.
[0079] S103. A cleaning sample is loaded into the first intermediate container. A cleaning channel is formed between the first displacement pump, the first three-way valve, the first intermediate container, the channel switch assembly, the inlet pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve, so as to drive the cleaning sample to clean the core sample through the first displacement pump.
[0080] In this embodiment, the core sample is cleaned, the channel used for airtightness verification is closed, the above-mentioned components are connected in sequence, and the core sample is cleaned by using a cleaning sample, such as petroleum ether, for displacement. The petroleum ether flowing out of the outlet pipeline is continuous and free of other impurities, confirming that the core sample is clean.
[0081] S104. Close the cleaning channel and open the airtightness verification channel to obtain the physical parameter values of the core sample;
[0082] In this embodiment, the cleaning channel is closed, the airtightness verification channel is opened, and nitrogen is used to displace the petroleum ether in the core sample. The physical parameters of the core sample are then measured using nitrogen. As an optional embodiment, the physical parameters include, but are not limited to, porosity, permeability, and pore volume. In this embodiment, the measured porosity φ = 16.81% and permeability k = 80.1 mD are used, and the pore volume V is calculated based on the porosity and permeability.
[0083] S105. Set the vacuum environment of the core clamping assembly, use the fourth displacement pump to inject hydraulic oil into the hydraulic oil chamber of the core clamping assembly to the preset pressure threshold, and use the third displacement pump to set the back pressure value of the back pressure valve to a preset back pressure threshold that is lower than the pressure threshold.
[0084] S106. Fill the fourth intermediate container with saturated formation water from the core sample, and set up a channel between the second displacement pump, the second three-way valve, the fourth intermediate container, the channel switch assembly, the inlet pressure sensor, the confining pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve, so as to drive the saturated formation water from the core sample into the core clamping assembly through the second displacement pump to establish an experimental environment that meets the pre-set pressure conditions.
[0085] In this embodiment, as an optional embodiment, the pressure conditions are preset to maintain the confining pressure 3-5 MPa higher than the back pressure, the back pressure 3-5 MPa higher than the outlet pressure, the inlet and outlet pressure reaching the formation pressure of 52 MPa, the temperature of the constant temperature chamber adjusted to the experimental temperature of 125°C, and the chamber left to stand for more than 8 hours.
[0086] S107. Crude oil collected from the target area is loaded into the third intermediate container. A channel is set up between the second displacement pump, the second three-way valve, the third intermediate container, the channel switch assembly, the inlet pressure sensor, the confining pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve. The crude oil is driven by the second displacement pump to inject into the core clamping assembly to establish an experimental environment that meets the pre-set bound water conditions. The water saturation and effective permeability of the oil phase under the bound water conditions are calculated.
[0087] In this embodiment, crude oil is injected into the core sample inside the core clamping assembly 04 until no more water flows out of the outlet, thus completing the establishment of bound water. As an optional embodiment, the calculated water saturation Swc = 25.3% and the effective oil phase permeability Ko(Swc) = 2.22mD are obtained.
[0088] S108. Set the pressure inside the fourth intermediate container to be higher than the pre-set pressure threshold at the inlet of the core clamping assembly, close the channel of the third intermediate container, and open the channel from the fourth intermediate container to the metering assembly. Drive the core sample to saturate formation water for water-driven oil phase permeability testing via the second displacement pump. Based on the water-driven oil phase permeability test value, physical parameter value, water saturation under bound water conditions, and effective oil phase permeability, obtain the water-driven oil phase permeability test parameter value.
[0089] In this embodiment, an information processor, such as a computer, is used to calculate the values of each parameter. As an optional embodiment, the pressure threshold is set to 0.5–1 MPa to prevent backflow of crude oil into the core holder when the sixth three-way valve 13 is opened. The water-drive oil phase permeability test parameters include, but are not limited to: the flow rate of formation water Qw at the inlet of the metering component, the flow rate of crude oil Qo, the rock sample inlet pressure P1, the rock sample outlet pressure P2, the volume of crude oil Vo, the volume of formation water Vw, the water saturation Sw, the effective permeability of the oil phase Ko, the effective permeability of the water phase Kw, the relative permeability of the oil phase Kro, and the relative permeability of the water phase Krw.
[0090] In this embodiment, as an optional embodiment, it further includes:
[0091] Based on the obtained water-drive oil phase permeability test parameters, curves showing the relationship between the relative permeability of the oil and water phases and the water saturation were plotted.
[0092] In this embodiment, as an optional embodiment, the first displacement pump 1 is connected to the first end of the first three-way valve 3; the second end and the third end of the first three-way valve 3 are respectively connected to the input end of the first intermediate container 5 and the input end of the second intermediate container 6, and the second end and the third end of the first three-way valve 3 are located on the same side.
[0093] In this embodiment, as an optional embodiment, the channel switch assembly 03 includes, but is not limited to: a third three-way valve 9, a fourth three-way valve 10, and a fifth three-way valve 11, wherein,
[0094] The output end of the first intermediate container 5 is connected to the first end of the third three-way valve 9, and the output end of the second intermediate container 6 is connected to the second end of the third three-way valve 9. The second end and the first end of the third three-way valve 9 are located on the same side.
[0095] The third end of the third three-way valve 9 is connected to the first end of the fourth three-way valve 10;
[0096] The third end of the fourth three-way valve 10 is connected to the inlet end of the core clamping assembly 04;
[0097] The output end of the third intermediate container 7 is connected to the first end of the fifth three-way valve 11, and the output end of the fourth intermediate container 8 is connected to the second end of the fifth three-way valve 11. The first and second ends of the fifth three-way valve 11 are located on the same side.
[0098] The third end of the fifth three-way valve 11 is connected to the second end of the fourth three-way valve 10, and the first and second ends of the fourth three-way valve 10 are located on the same side.
[0099] In this embodiment, as an optional embodiment, the second displacement pump 2 is connected to the first end of the second three-way valve 4; the second end and the third end of the second three-way valve 4 are respectively connected to the input end of the third intermediate container 7 and the input end of the fourth intermediate container 8, and the second end and the third end of the second three-way valve 4 are located on the same side.
[0100] In this embodiment, as an optional embodiment, the third end of the fourth three-way valve 10 is connected to the input end of the inlet pressure sensor 12; the output end of the inlet pressure sensor 12 is connected to the first end of the sixth three-way valve 13; the second end of the sixth three-way valve 13 is connected to the input end of the confining pressure sensing device 15; the third end of the sixth three-way valve 13 is connected to the inlet end of the core clamping assembly 04; and the first and second ends of the sixth three-way valve 13 are located on the same side.
[0101] The output end of the confining pressure sensor 15 is connected to the first end of the seventh three-way valve 19;
[0102] The third end of the seventh three-way valve 19 is connected to the input end of the outlet pressure sensor 18;
[0103] The output end of the outlet pressure sensor 18 is connected to the outlet end of the core clamping assembly 04.
[0104] In this embodiment, as an optional embodiment, the core clamping assembly 04 includes, but is not limited to: a core clamp (not shown in the figure), a first end face cover 14, a hydraulic oil cavity 16, and a second end face cover 17, wherein,
[0105] The core holder is used to hold the core sample and is set in the hydraulic oil cavity 16. The first end cover 14 is the inlet end of the core holding assembly 04, and the second end cover 17 is the outlet end of the core holding assembly 04. The first end cover 14 and the second end cover 17 form the hydraulic oil cavity 16 through the sealing ring and the thread.
[0106] In this embodiment, the hydraulic oil cavity 16 is formed by a first end cap 14 and a second end cap 17, and a sealing cavity is formed by a sealing ring and threads to achieve a sealing effect. As an optional embodiment, the end cap is made of Hastelloy, and the sealing ring is preferably made of a high-temperature resistant polymer material. The hydraulic oil cavity 16 is used to provide confining pressure for the core sample. It is connected to the end cap through three layers of sealing rings to ensure that the hydraulic oil cannot flow out under high temperature and high pressure conditions.
[0107] In this embodiment, the third displacement pump 21 and the back pressure valve 20 constitute a back pressure system that provides back pressure. As an optional embodiment, the back pressure system is connected to the outlet end of the core holder through the seventh three-way valve 19 and to the metering component through a pipeline.
[0108] In this embodiment, as an optional embodiment, the metering component includes: a first measuring cylinder 22, a superhydrophilic semi-permeable membrane 23, a second measuring cylinder 24, and a test tube rack 25, wherein,
[0109] The first measuring cylinder 22 is connected to the fluid outlet end of the back pressure valve 20. The first measuring cylinder 22 is connected to the second measuring cylinder 24. The superhydrophilic semipermeable membrane 23 is disposed between the first measuring cylinder 22 and the second measuring cylinder 24. The test tube rack 25 is connected to the second measuring cylinder 24.
[0110] In this embodiment, during the experiment, the outlet fluid of the back pressure valve 20 first enters the first measuring cylinder 22. Due to the presence of the superhydrophilic semi-permeable membrane 23, the water in the outlet fluid will pass through the superhydrophilic semi-permeable membrane 23 and enter the second measuring cylinder 24, so that the first measuring cylinder 22 collects oil and the second measuring cylinder 24 collects water. In this way, the volume of the outflowing oil and water can be directly obtained by reading the two measuring cylinders.
[0111] In this embodiment, crude oil and core samples were both from the target high-pour-point oil reservoir block. Formation water was prepared in the laboratory based on actual field data of the target high-pour-point oil reservoir block. Water flooding experiments were conducted under the original formation pressure (52 MPa) and the original temperature (125℃) and the high-pour-point oil anomalous point temperature (45℃) to test the effect of temperature on the relative permeability of high-pour-point oil and water.
[0112] In this embodiment, the third displacement pump provides back pressure, and the fourth displacement pump provides confining pressure. The temperature control unit of the thermostat is 0.1℃, ensuring high accuracy. It is equipped with an overload protection device that automatically cuts off power when the temperature exceeds 180℃. Pressure sensors are used to monitor the inlet and outlet pressures and confining pressure in real time during the experiment. The injection pressure and back pressure can be displayed through the displacement pumps. The back pressure valve is used to maintain and regulate the back pressure, thereby controlling the outlet pressure.
[0113] In this embodiment, the core holder, part of the intermediate container, pressure sensor, and back pressure valve are all placed in a constant temperature chamber, which can effectively eliminate the influence of temperature changes on the experimental results.
[0114] Figure 3 The embodiments of the present invention are based on Figure 1 Another flowchart illustrating the oil-water phase relative permeability testing method. (See diagram below.) Figure 3 As shown, in this embodiment, the method includes:
[0115] S201. Core sample preparation;
[0116] In this embodiment, the target area is the target high-pour-point oil reservoir block. The obtained core samples from the target high-pour-point oil reservoir block are pre-treated, including but not limited to: cutting to the length allowed by the equipment and grinding the end face. In this embodiment, the pre-treated core has a length L = 5.01 cm, a diameter d = 2.51 cm, and a cross-sectional area A = 4.95 cm². 2 .
[0117] S202. Prepare core samples for saturation with formation water and conduct tests.
[0118] In this embodiment, the field production data showed that the salinity of the formation water was 35723.20 mg / L, and the compound was prepared in the laboratory based on this salinity. The actual reservoir temperature was 125℃, and the rheological test showed that the viscosity of the formation water at this temperature was 0.55 mPa·s, and the viscosity of the crude oil was 3.17 mPa·s. Nitrogen and petroleum ether for cleaning the experimental equipment and core samples were placed in different intermediate containers for later use.
[0119] S203. Perform an airtightness test;
[0120] In this embodiment, after connecting the pipeline and testing the airtightness: the first displacement pump 1 is adjusted to a constant speed mode of 0.125 ml / min. The right valves of the first three-way valve 3 and the third three-way valve 9 are opened in sequence. That is, the first displacement pump 1 is connected to the second intermediate container 6 through the first three-way valve 3, and the second intermediate container 6 is connected to the fourth three-way valve 10 through the third three-way valve 9. The left valve of the fourth three-way valve 10 is opened (the output end of the third three-way valve 9 is connected to the first end of the fourth three-way valve 10). The valves on both sides of the sixth three-way valve 13 and the seventh three-way valve 19 are opened. That is, the first end of the sixth three-way valve 13 is connected to the first three-way valve 10. With the three-terminal connection established and the third and second terminals of the seventh three-way valve 19 connected, the valves of the inlet pressure sensor 12 and the outlet pressure sensor 18 opened. Nitrogen gas was used for displacement, and the outlet pipeline was placed in water. When continuous bubbles appeared at the outlet, foaming agent or soapy water was applied to each connection point to check for bubbles at the connection points of each pipeline, the connection point of the three-way valve, the end face of the core holder, and the connection point of the back pressure valve. The inlet and outlet pressures and the confining pressure were continuously observed. If no bubbles were generated at each connection point and end face, and all pressure data remained stable, it proved that the airtightness was good.
[0121] S204, Clean the core sample;
[0122] In this embodiment, the valve opened during the airtightness test is closed, and the first displacement pump 1 is kept at a constant speed of 0.125 ml / min. The left valves of the first three-way valve 3, the third three-way valve 9, and the fourth three-way valve 10 are opened sequentially (the first displacement pump 1 is connected to the first intermediate container 5 through the first three-way valve 3, and the first intermediate container 5 is connected to the fourth three-way valve 10 through the third three-way valve 9). The valves on both sides of the sixth three-way valve 13 and the seventh three-way valve 19 are opened, and the remaining valves are closed. Petroleum ether is used for displacement to clean the experimental core sample. The outlet pipeline is connected to the test tube. When the petroleum ether flowing out of the outlet is continuous and free of other impurities, it is confirmed that the core sample is clean. Then, the above valves are closed, the valve for airtightness testing is opened, and nitrogen is used to displace the petroleum ether in the core. The porosity φ = 16.81% and the permeability k = 80.1 mD of the core are measured using nitrogen, and the pore volume V is calculated.
[0123] S205. Establish the experimental environment;
[0124] In this embodiment, as an optional implementation, a vacuum pump is connected to the lower side of the sixth three-way valve 13. The lower valve of the sixth three-way valve 13 is opened, connecting the sixth three-way valve 13 and the vacuum pump. The core holder is evacuated (for more than 4 hours). Then, the pipeline is connected, and the fast mode of the fourth displacement pump 28 is turned on to inject hydraulic oil into the hydraulic oil chamber 16. After the hydraulic oil fills the hydraulic oil chamber 16, it is pressurized to 5MPa. The fast mode of the third displacement pump 21 is turned on to add 3MPa back pressure to the back pressure valve 20. The second displacement pump 2 is adjusted to a constant speed mode of 0.125ml / min. The second three-way valve is opened in sequence. The valves on the right side of valve 4, the fifth three-way valve 11, and the fourth three-way valve 10 (the fourth intermediate container 8 is open), the valves on both sides of the sixth three-way valve 13 and the seventh three-way valve 19, the valves of the inlet pressure sensor 12 and the outlet pressure sensor 18, the core sample saturated with formation water is injected through the intermediate container 8 using a displacement pump, and the core sample is continuously displaced by the saturated formation water to establish the experimental pressure. During the process, the confining pressure is always kept 3-5 MPa higher than the back pressure, and the back pressure is kept 3-5 MPa higher than the outlet pressure, until the inlet and outlet pressures reach the formation pressure of 52 MPa. The temperature of the constant temperature chamber is adjusted to the experimental temperature of 125℃ and left to stand for more than 8 hours.
[0125] S206. Establish conditions for bound water;
[0126] In this embodiment, the second displacement pump 2 is kept at a constant speed of 0.125 ml / min. The right valves of the second three-way valve 4, the fifth three-way valve 11, and the fourth three-way valve 10, and the lower valve of the sixth three-way valve 13 are closed. The left valves of the second three-way valve 4 and the fifth three-way valve 11, the right valve of the fourth three-way valve 10, and both valves of the sixth three-way valve 13 are opened. Crude oil is injected into the core sample until no more water flows out of the outlet. The establishment of bound water is completed. The water saturation Swc = 25.3% and the effective permeability Ko(Swc) = 2.22 mD under the bound water condition are calculated.
[0127] S207. Conduct water-drive oil phase permeation test;
[0128] In this embodiment, the second displacement pump 2 is kept at a constant speed of 0.125 ml / min. The left valves of the second three-way valve 4 and the fifth three-way valve 11, the right valve of the fourth three-way valve 10, and both valves of the sixth three-way valve 13 are closed. The right valves of the second three-way valve 4, the fifth three-way valve 11, and the fourth three-way valve 10 are opened. The pressure in the intermediate container containing the core sample saturated with formation water is increased to 0.5–1 MPa higher than the inlet pressure of the core holder, to prevent crude oil from entering the core holder when the sixth three-way valve 13 is opened. The backflow phenomenon was investigated, and then water-driven oil phase permeability tests were conducted using core samples saturated with formation water. The flow rate Qw of formation water in the second measuring cylinder 24 at the inlet, the flow rate Qo of crude oil in the first measuring cylinder 22, the inlet pressure P1 of the rock sample, and the outlet pressure P2 of the rock sample were recorded. The fluid collected in the test tube was separated into oil and water using a centrifuge 24. The volume Vo of crude oil and the volume Vw of formation water were read, and the water saturation Sw, effective permeability Ko of oil phase, effective permeability Kw of water phase, relative permeability Kro of oil phase, and relative permeability Krw of water phase were calculated.
[0129] In this embodiment, the following formula is used for calculation:
[0130]
[0131] Sw—Water saturation, decimal;
[0132] Vo—volume of crude oil, ml;
[0133] P1—Inlet pressure of rock sample, MPa;
[0134] P2—Exit pressure of rock sample, MPa;
[0135] Ko—Effective permeability of the oil phase, %;
[0136] Kw—Aqueous phase effective permeability, %;
[0137] Kro—Relative permeability of the oil phase, decimal;
[0138] Krw—Relative permeability of the aqueous phase, decimal;
[0139] Qw—Flow rate of formation water at the inlet, ml / min;
[0140] Qo—Crude oil flow rate at the outlet, ml / min;
[0141] Vo—Volume of oil at the outlet (after centrifugation), ml;
[0142] Vw—Volume of water at the outlet (after centrifugation), ml.
[0143] S208. Plot the curves showing the relationship between the relative permeability of the oil phase and the relative permeability of the water phase and the water saturation.
[0144] Figure 4 This is a schematic diagram showing the relationship between the relative permeability of the oil phase and the water saturation in an embodiment of the present invention.
[0145] Figure 5 This is a schematic diagram showing the relationship between the relative permeability of the aqueous phase and the water saturation in an embodiment of the present invention.
[0146] S209. The components are cleaned after the experiment to proceed to the next set of experiments.
[0147] In this embodiment, after a set of experiments is completed, the left valve of the first three-way valve 3 is opened, and the pressure of the intermediate container 6 is raised to 0.5-1 MPa higher than the inlet pressure using the first displacement pump 1. The pressure is then adjusted to a constant speed. Subsequently, the left valves of the third three-way valve 9 and the fourth three-way valve 10 are opened in sequence to clean the core. After cleaning, the valves opened in step S209 are closed. Similarly, the right valves of the first three-way valve 3 and the third three-way valve 9, and the left valve of the fourth three-way valve 10 are opened in sequence to accelerate the drying of the core using nitrogen gas. The temperature of the constant temperature chamber is adjusted to 45°C (the anomalous point temperature of high-pour-point oil in the study area). Steps S205, S206, S207, and S208 are repeated to conduct the next set of experiments. In this way, it is not necessary to disassemble and install the intermediate container again, which improves the experimental efficiency.
[0148] In this embodiment, the method described herein enables the testing of the relative permeability of oil and water phases in actual core samples under real reservoir conditions (125℃, 52MPa). Furthermore, during multiple experiments at different temperatures, core cleaning can be completed simply by switching valves, eliminating the potential errors caused by disassembling intermediate containers, resulting in a simple and efficient process. Moreover, the influence of temperature on the seepage patterns of high-pour-point oil and water is fully considered. By simulating an oil-water phase permeation process closer to actual formation conditions, the measurement results are more consistent with reservoir conditions, leading to higher experimental accuracy. Additionally, this embodiment allows for timely cleaning and drying of the core samples at the beginning and end of the experiment, eliminating the time and potential risks of pipeline leakage associated with disassembling intermediate containers, cleaning, checking piston airtightness, and reassembly. Furthermore, the metering component in this embodiment utilizes a superhydrophilic semi-permeable membrane to directly separate and measure oil and water at the outlet, eliminating the need for centrifugal separation and subsequent reading, saving time and improving metering accuracy. It features simple and easy operation, time-saving, and high accuracy, providing a more efficient and precise method for reservoir condition relative permeability testing in the development of ultra-deep high-pour-point oil reservoirs.
[0149] Based on the same inventive concept, embodiments of the present invention also provide a storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the oil-water phase relative permeability testing method in any of the above possible implementations.
[0150] Alternatively, the storage medium may be a non-transitory computer-readable storage medium, such as a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device.
[0151] Based on the same inventive concept, see [link to inventive concept] Figure 6 This invention also provides an electronic device, including a memory 101 (e.g., non-volatile memory), a processor 102, and a computer program stored on the memory 101 and executable on the processor 102. When the processor 102 executes the program, it implements the steps of the oil-water phase relative permeability testing method described in any of the above possible implementations, which is equivalent to the aforementioned oil-water phase relative permeability testing device. Of course, the processor can also be used to process other data or perform calculations. This electronic device can be a PC, server, terminal, or other similar device.
[0152] like Figure 6 As shown, the electronic device may also include: memory 103, network interface 104, and internal bus 105. In addition to these components, other hardware may also be included, which will not be described in detail here.
[0153] It should be noted that the above-mentioned oil-water phase relative permeability testing device can be implemented by software. As a device in a logical sense, it is formed by the processor 102 of the electronic device in which it is located reading the computer program instructions stored in the non-volatile memory into the memory 103 for execution.
[0154] The embodiments of the subject matter and functional operation described in this specification can be implemented in the following ways: digital electronic circuits, tangibly embodied computer software or firmware, computer hardware including the structures disclosed in this specification and their structural equivalents, or combinations thereof. Embodiments of the subject matter described in this specification can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on a tangible, non-transitory program carrier for execution by a data processing apparatus or for controlling the operation of a data processing apparatus. Alternatively or additionally, the program instructions may be encoded on artificially generated propagation signals, such as machine-generated electrical, optical, or electromagnetic signals, which are generated to encode information and transmit it to a suitable receiving device for execution by the data processing apparatus. The computer storage medium may be a machine-readable storage device, a machine-readable storage substrate, a random or serial access memory device, or combinations thereof.
[0155] The processing and logic flow described in this specification can be executed by one or more programmable computers that execute one or more computer programs to perform corresponding functions by operating on input data and generating output. The processing and logic flow can also be executed by special-purpose logic circuitry—such as FPGAs (Field-Programmable Gate Arrays) or ASICs (Application-Specific Integrated Circuits), and the device can also be implemented as special-purpose logic circuitry.
[0156] Computers suitable for executing computer programs include, for example, general-purpose and / or special-purpose microprocessors, or any other type of central processing unit. Typically, the central processing unit receives instructions and data from read-only memory and / or random access memory. The basic components of a computer include a central processing unit for implementing or executing instructions and one or more memory devices for storing instructions and data. Typically, a computer will also include one or more mass storage devices for storing data, such as disks, magneto-optical disks, or optical disks, or the computer will be operatively coupled to such mass storage devices to receive data from or transfer data to them, or both. However, a computer is not required to have such devices. Furthermore, a computer can be embedded in another device, such as a mobile phone, a personal digital assistant (PDA), a mobile audio or video player, a game console, a global positioning system (GPS) receiver, or a portable storage device such as a universal serial bus (USB) flash drive, to name a few.
[0157] Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and memory devices, such as semiconductor memory devices (e.g., EPROM, EEPROM, and flash memory devices), magnetic disks (e.g., internal hard disks or removable disks), magneto-optical disks, and CD-ROM and DVD-ROM disks. Processors and memory may be supplemented by or incorporated into dedicated logic circuitry.
[0158] While this specification contains numerous specific implementation details, these should not be construed as limiting the scope of any invention or the scope of the claims, but rather are primarily used to describe features of specific embodiments of a particular invention. Certain features described in the various embodiments herein may also be implemented in combination in a single embodiment. Conversely, various features described in a single embodiment may also be implemented separately in various embodiments or in any suitable sub-combination. Furthermore, while features may function in certain combinations as described above and even initially claimed in this way, one or more features from a claimed combination may be removed from that combination in some cases, and a claimed combination may refer to a sub-combination or a variation thereof.
[0159] Similarly, although the operations are depicted in a specific order in the accompanying drawings, this should not be construed as requiring these operations to be performed in the specific order shown or sequentially, or requiring all illustrated operations to be performed to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of various system modules and components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.
[0160] Thus, specific embodiments of the subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims may be performed in a different order and still achieve the desired result. Furthermore, the processes depicted in the drawings are not necessarily shown in a specific order or sequence to achieve the desired result. In some implementations, multitasking and parallel processing may be advantageous.
[0161] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.
[0162] The above are merely specific embodiments of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A device for testing the relative permeability of an oil-water phase, characterized in that, include: The system comprises a first three-way valve (3), a second three-way valve (4), a first intermediate container assembly (01), a second intermediate container assembly (02), a channel switch assembly (03), a sixth three-way valve (13), a seventh three-way valve (19), a pressure sensing assembly, a constant temperature chamber (27), a core clamping assembly (04), a displacement pump assembly, a back pressure valve (20), a metering assembly (05), and an information processor (26), among which, The displacement pump assembly includes: a first displacement pump (1), a second displacement pump (2), a third displacement pump (21), and a fourth displacement pump (28); The first displacement pump (1) is connected to the input end of the first intermediate container assembly (01) via the first three-way valve (3); The second displacement pump (2) is connected to the input end of the second intermediate container assembly (02) via the second three-way valve (4); The output ends of the first intermediate container assembly (01) and the second intermediate container assembly (02) are respectively connected to the sixth three-way valve (13) through the channel switch assembly (03); The sixth three-way valve (13) is also connected to the core clamping assembly (04); The core clamping assembly (04) is also connected to the seventh three-way valve (19), the seventh three-way valve (19) is also connected to the back pressure valve (20), and the back pressure valve (20) is also connected to the metering assembly (05); The second intermediate container assembly (02), the core clamping assembly (04), the sixth three-way valve (13), the seventh three-way valve (19), the pressure sensing assembly, and the back pressure valve (20) are installed in the constant temperature chamber (27); The pressure sensing assembly includes: an inlet force sensor (12), an outlet pressure sensor (18), and a confining pressure sensor (15); The inlet force sensor (12) is installed on the line between the channel switch assembly (03) and the sixth three-way valve (13); The outlet pressure sensor (18) is installed on the line between the core clamping assembly (04) and the seventh three-way valve (19); The confining pressure sensor (15) is installed on the line between the sixth three-way valve (13) and the seventh three-way valve (19); The pressure sensing component and the metering component (05) are also connected to the information processor (26); The third displacement pump (21) is connected to the back pressure valve (20), and the fourth displacement pump (28) is connected to the core clamping assembly (04).
2. The oil-water phase relative permeability testing device according to claim 1, characterized in that, The first displacement pump (1) is connected to the first end of the first three-way valve (3); the second and third ends of the first three-way valve (3) are respectively connected to the input end of the first intermediate container (5) and the input end of the second intermediate container (6), and the second and third ends of the first three-way valve (3) are located on the same side.
3. The oil-water phase relative permeability testing device according to claim 1, characterized in that, The channel switch assembly (03) includes: a third three-way valve (9), a fourth three-way valve (10), and a fifth three-way valve (11), wherein, The output end of the first intermediate container (5) is connected to the first end of the third three-way valve (9), and the output end of the second intermediate container (6) is connected to the second end of the third three-way valve (9). The second end and the first end of the third three-way valve (9) are located on the same side. The third end of the third three-way valve (9) is connected to the first end of the fourth three-way valve (10); The third end of the fourth three-way valve (10) is connected to the inlet end of the core clamping assembly (04); The output end of the third intermediate container (7) is connected to the first end of the fifth three-way valve (11), and the output end of the fourth intermediate container (8) is connected to the second end of the fifth three-way valve (11). The first and second ends of the fifth three-way valve (11) are located on the same side. The third end of the fifth three-way valve (11) is connected to the second end of the fourth three-way valve (10), and the first and second ends of the fourth three-way valve (10) are located on the same side.
4. The oil-water phase relative permeability testing device according to claim 3, characterized in that, The third end of the fourth three-way valve (10) is connected to the input end of the inlet pressure sensor (12); the output end of the inlet pressure sensor (12) is connected to the first end of the sixth three-way valve (13); the second end of the sixth three-way valve (13) is connected to the input end of the confining pressure sensor (15); the third end of the sixth three-way valve (13) is connected to the inlet end of the core clamping assembly (04); the first end and the second end of the sixth three-way valve (13) are located on the same side. The output end of the confining pressure sensor (15) is connected to the first end of the seventh three-way valve (19); The third end of the seventh three-way valve (19) is connected to the input end of the outlet pressure sensor (18); The output end of the outlet pressure sensor (18) is connected to the outlet end of the core clamping assembly (04).
5. The oil-water phase relative permeability testing apparatus according to any one of claims 1 to 4, characterized in that, The core clamping assembly (04) includes: a core clamp, a first end cap (14), a hydraulic oil cavity (16), and a second end cap (17), wherein, The core holder is used to hold the core sample and is set in the hydraulic oil cavity (16). The first end cover (14) is the inlet end of the core holding assembly (04), and the second end cover (17) is the outlet end of the core holding assembly (04). The first end cover (14) and the second end cover (17) form the hydraulic oil cavity (16) through the sealing ring and the thread.
6. The oil-water phase relative permeability testing apparatus according to any one of claims 1 to 4, characterized in that, The metering assembly includes: a first graduated cylinder (22), a superhydrophilic semi-permeable membrane (23), a second graduated cylinder (24), and a test tube rack (25), wherein, The first measuring cylinder (22) is connected to the fluid outlet end of the back pressure valve (20), the first measuring cylinder (22) is connected to the second measuring cylinder (24), the superhydrophilic semipermeable membrane (23) is placed between the first measuring cylinder (22) and the second measuring cylinder (24), and the test tube rack (25) is connected to the second measuring cylinder (24).
7. The oil-water phase relative permeability testing apparatus according to any one of claims 1 to 4, characterized in that, The second displacement pump (2) is connected to the first end of the second three-way valve (4); the second and third ends of the second three-way valve (4) are respectively connected to the input end of the third intermediate container (7) and the input end of the fourth intermediate container (8), and the second and third ends of the second three-way valve (4) are located on the same side.
8. A method for testing the relative permeability of an oil-water phase, characterized in that, The oil-water phase relative permeability testing apparatus as described in any one of claims 1 to 7, wherein the oil-water phase relative permeability testing method comprises: Obtain core samples from the target area, load them into the core clamping assembly, and saturate the core samples with formation water according to the mineralization of the formation water in the target area. An airtightness test sample is placed in the second intermediate container. A channel is set up between the first displacement pump, the first three-way valve, the second intermediate container, the channel switch assembly, the inlet pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve to form an airtightness verification channel, so that the airtightness test sample is driven by the first displacement pump to perform airtightness verification. A cleaning sample is placed in the first intermediate container. A cleaning channel is formed between the first displacement pump, the first three-way valve, the first intermediate container, the channel switch assembly, the inlet pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve. The cleaning sample is driven by the first displacement pump to clean the core sample. Close the cleaning channel and open the airtightness verification channel to obtain the physical parameter values of the core sample; Set up a vacuum environment for the core clamping assembly, use the fourth displacement pump to inject hydraulic oil into the hydraulic oil chamber of the core clamping assembly to a preset pressure threshold, and use the third displacement pump to set the back pressure value of the back pressure valve to a preset back pressure threshold that is lower than the pressure threshold. The core sample is filled with saturated formation water in the fourth intermediate container. A channel is set up between the second displacement pump, the second three-way valve, the fourth intermediate container, the channel switch assembly, the inlet pressure sensor, the confining pressure sensor, the core clamping assembly, the outlet pressure sensor, the seventh three-way valve, and the back pressure valve. The second displacement pump drives the saturated formation water in the core sample to be injected into the core clamping assembly to establish an experimental environment that meets the pre-set pressure conditions. Crude oil collected from the target area is loaded into the third intermediate container. A second displacement pump, a second three-way valve, a third intermediate container, a channel switch assembly, an inlet pressure sensor, a confining pressure sensor, a core clamping assembly, an outlet pressure sensor, a seventh three-way valve, and a back pressure valve are set up to drive the crude oil into the core clamping assembly to establish an experimental environment that meets the pre-set bound water conditions. The water saturation and effective permeability of the oil phase under the bound water conditions are calculated. The pressure inside the fourth intermediate container is set higher than the pre-set pressure threshold at the inlet of the core clamping assembly. The channel of the third intermediate container is closed, and the channel from the fourth intermediate container to the metering assembly is opened. The core sample is then saturated with formation water to conduct a water-drive oil phase permeability test via the second displacement pump. Based on the water-drive oil phase permeability test value, physical parameter value, water saturation under bound water conditions, and effective oil phase permeability, the water-drive oil phase permeability test parameter value is obtained.
9. A storage medium, characterized in that, A program or instruction is stored on the storage medium, and the program or instruction is executed by the processor to implement the steps of the oil-water phase relative permeability test method as described in claim 8.
10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the oil-water phase relative permeability testing method according to claim 8.