Apparatus and method for calibrating and testing saturation of three-phase fluids of oil, gas and water

Abstract

The present invention relates to the technical field of oilfield development, and specifically to a device and method for calibrating and testing the saturation of three-phase fluids of oil, gas and water. The device includes a holder, a test system transmitting module, and a test system receiving module; the test system transmitting module is installed on the upper surface of the holder, and the test system receiving module is installed on the lower surface of the holder; the test system receiving module is connected to a computer for data processing. The device and method of the present invention can be used to conveniently and quickly identify the distribution of three-phase fluids of oil, gas and water in the CO2 flooding process. The established different oil, gas and water saturation and resistivity, and acoustic wave velocity charts are applied to the physical simulation experiment of CO2 flooding, and can analyze the flow field and saturation field change law in the CO2 flooding process, thereby guiding CO2 flooding development.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield development, and in particular to a device and method for calibrating and testing the saturation of three-phase fluids of oil, gas and water. Background Art

[0002] Due to CO 2 The large difference in gas-oil mobility ratio during the displacement makes it easy for viscous fingering to occur during the gas displacement process, and then gas channeling. How to determine the distribution and sweep law of multiphase fluids during the gas displacement process has become the focus of gas displacement research and is also a difficult problem in the current laboratory. The existing reservoir oil-water saturation test methods mainly include: distillation extraction method, coulomb method, immersion method, etc. However, these methods can only measure the static fluid distribution in the porous medium, and cannot obtain the dynamic multiphase fluid distribution during the displacement process. The multiphase fluid saturation test methods in displacement mainly include resistivity method, X-ray method, nuclear magnetic resonance scanning method, etc. However, these methods cannot simultaneously identify the three phases of oil, gas, and water, and have poor accuracy. Therefore, it is impossible to determine the gas displacement front and predict the gas channeling law. The inability to determine the distribution of multiphase fluids during the displacement process has caused the existing gas drive experiments to become black box experiments, lacking direct guiding significance.

[0003] Chinese patent application CN110887955A discloses a shale fluid saturation test device and test method; the test device includes: a reaction container, wherein the reaction container is provided with a bearing part for bearing a sample, and the bearing part is provided with a through hole for flowing out the fluid generated by the sample; a heating component for heating the reaction container, and the heating component is connected to the reaction container; a condensation component for condensing the fluid, and the condensation component is arranged downstream of the reaction container; a collection component for collecting the fluid condensed by the condensation component, and the collection component is located downstream of the condensation component, and the collection component is provided with a metering part for measuring the volume of the fluid. However, this patent can only obtain the static fluid composition inside the shale, and cannot obtain the dynamic multiphase fluid distribution during the displacement process.

[0004] Chinese invention patent CN106770488B discloses a device and method for obtaining the oil-water saturation of anisotropic seepage medium in fractures, the device for obtaining the oil-water saturation of anisotropic seepage medium in fractures includes: a resistivity meter, multiple pairs of single-electrode probes, each single-electrode probe is connected to a lead wire; the resistivity meter includes multiple access terminals, each access terminal is connected to one end of the lead wire; the single-electrode probe is connected to the center of the cross seam where eight cubic rock blocks are connected; the resistivity meter is used to measure the resistance value of the corresponding medium between each pair of single-electrode probes, and convert each resistance value into oil-water saturation. However, this patent can only identify the two-phase distribution of oil and water in porous media, and cannot simultaneously identify the three-phase fluid of oil, gas and water.

[0005] Therefore, a method for calibrating the saturation of three-phase fluids of oil, gas and water is needed, especially for oilfield CO 2 Calibration test method for saturation of three-phase fluid of oil, gas and water. Summary of the invention

[0006] The main purpose of the present invention is to provide a device and method for calibrating the saturation test of three-phase fluids of oil, gas and water. By using the device and method of the present invention, the saturations corresponding to the three-phase fluids of oil, gas and water are obtained by inversion through testing the change law of regional physical properties during gas drive, thereby making up for the shortcomings of the existing technology.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The present invention provides a device for calibrating and testing the saturation of three-phase fluids of oil, gas and water. The device comprises a holder, a test system transmitting module and a test system receiving module. The inner cavity of the holder is in a rectangular parallelepiped shape. The test system transmitting module is installed on the upper surface of the holder, and the test system receiving module is installed on the lower surface of the holder. The test system receiving module is connected to a computer for data processing.

[0009] Furthermore, the transmitting module of the test system is composed of a plurality of resistivity positive electrodes and a plurality of acoustic wave transmitting electrodes, which are equidistantly distributed on the upper surface of the holder.

[0010] Furthermore, the receiving module of the test system is composed of a corresponding number of resistivity negative electrodes and a number of sound wave receiving electrodes, which are equidistantly distributed on the lower surface of the clamp.

[0011] The present invention also provides a method for calibrating the saturation of three-phase fluids of oil, gas and water using any of the above devices, comprising the following steps:

[0012] Step 1. Establish a calibration experimental model;

[0013] Step 2. Conduct calibration experiments and record injection and production parameters, resistivity, and acoustic wave velocity;

[0014] Step 3. Establish a numerical simulation model and fit the injection and production parameters;

[0015] Step 4. Establish a graph showing the relationship between saturation, resistivity and acoustic wave velocity;

[0016] Step 5. Calculate the saturation of the three-phase fluid of oil, gas and water according to the relationship diagram obtained in step 4.

[0017] Furthermore, in step 1, a homogeneous sand filling model that meets the physical properties of the target reservoir is loaded in the device holder, the target reservoir formation fluid is prepared and saturated, and a calibration experimental model is established.

[0018] Further, in step 2, CO is carried out under the temperature and pressure conditions of the target reservoir. 2 The flooding calibration experiment was carried out, and the injection and production parameters at different injection PV numbers were recorded. The resistivity and acoustic wave velocity of each measuring point along the sand filling model were recorded through the test system.

[0019] Furthermore, in step 3, according to the calibration experiment in step 2, a corresponding numerical simulation model is established to simulate the calibration displacement process and fit the historical injection and production data.

[0020] Furthermore, in step 4, by comparing the resistivity and acoustic wave velocity data in the calibration experiment with the oil, gas and water saturation distributions in the numerical simulation, a water phase saturation and resistivity relationship chart and a gas phase saturation and acoustic wave velocity relationship chart are established.

[0021] Further, in step 5, the water phase saturation and gas phase saturation are calculated according to the plate obtained in step 4, and the oil phase saturation can be calculated by the following formula:

[0022] So=1-Sw-Sg

[0023] Among them, So is the oil phase saturation, Sw is the water phase saturation, and Sg is the gas phase saturation.

[0024] Furthermore, the injection and production parameters include injection pressure, production pressure, oil production, water production, gas production, and production gas-oil ratio.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] The device and method of the present invention can be used to conveniently and quickly identify CO 2 The distribution of oil, gas and water three-phase fluids during flooding, and the established oil, gas and water saturation and resistivity and acoustic wave velocity charts are applied to CO 2 In the flooding physical simulation experiment, it is possible to analyze CO 2 The flow field and saturation field change rules during the flooding process can guide the CO 2 Drive development. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 This is a schematic diagram of the structure of a device for calibrating and testing the saturation of three-phase fluids of oil, gas and water according to a specific embodiment of the present invention;

[0029] Figure 2This is a flow chart of a method for calibrating and testing the saturation of a three-phase fluid of oil, gas and water according to a specific embodiment of the present invention;

[0030] Figure 3 A graph showing the relationship between water phase saturation and resistivity according to a specific embodiment of the present invention;

[0031] Figure 4 This is a graph showing the relationship between gas phase saturation and acoustic wave velocity according to a specific embodiment of the present invention.

[0032] Among them, 1. clamp, 2. test system transmitting module, 3. test system receiving module, 4. resistivity positive electrode 1, 5. acoustic wave transmitting electrode 1, 6. resistivity positive electrode 2, 7. acoustic wave transmitting electrode 2, 8. resistivity positive electrode 3, 9. acoustic wave transmitting electrode 3, 10. resistivity positive electrode 4, 11. acoustic wave transmitting electrode 4, 12. resistivity negative electrode 1, 13. acoustic wave receiving electrode 1, 14. resistivity negative electrode 2, 15. acoustic wave receiving electrode 2, 16. resistivity negative electrode 3, 17. acoustic wave receiving electrode 3, 18. resistivity negative electrode 4, 19. acoustic wave receiving electrode 4. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations and / or combinations thereof.

[0035] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

[0036] Example 1

[0037] like Figure 1 As shown, the oil, gas, and water three-phase fluid saturation calibration test device includes a holder 1, a test system transmitting module 2, and a test system receiving module 3; the test system transmitting module 2 is installed on the upper surface of the holder 1, and the test system receiving module 3 is installed on the lower surface of the holder 1; the test system receiving module 3 is connected to a computer for data processing. The inner cavity of the holder is a rectangular parallelepiped.

[0038] The test system transmitting module 2 is composed of 4 resistivity positive electrodes and 4 acoustic wave transmitting electrodes, which are equidistantly distributed on the upper surface of the holder.

[0039] The test system receiving module 3 is composed of four corresponding resistivity negative electrodes and four sound wave receiving electrodes, which are equidistantly distributed on the lower surface of the holder.

[0040] Example 2

[0041] like Figure 2 As shown, the oil, gas and water three-phase fluid saturation calibration test method includes the following steps:

[0042] Step 1: Load a homogeneous sand filling model that meets the physical properties of the target reservoir into a calibration holder, prepare the target reservoir formation fluid and saturate it.

[0043] Step 2: CO is carried out under the temperature and pressure conditions of the target reservoir. 2 The flooding calibration experiment was carried out, and the injection and production parameters such as injection pressure, production pressure, oil production, water production, and production gas-oil ratio at different injection PV numbers were recorded. The resistivity and acoustic wave velocity of each measuring point along the sand filling model were recorded through the test system.

[0044] Step 3, for the one-dimensional CO in step 2 2 The displacement calibration experiment was carried out, and the corresponding numerical simulation model was established. The Eclipse software was used to simulate the calibration displacement process. During the simulation of the calibration experiment, the model physical properties, fluid physical properties, and injection-production system were the same as those of the calibration experiment; and the calibration experiment data were used to fit the injection pressure, production pressure, liquid production, production gas-oil ratio and other injection-production parameters in the simulated displacement process. The numerical simulation displacement process after fitting can be regarded as equivalent to the calibration experiment process in step 2. At the same time, the oil, gas, and water three-phase fluid distribution in the numerical simulation model and the calibration experiment model is the same.

[0045] Step 4: According to the oil, gas, and water three-phase fluid saturations at different times and locations during the numerical simulation displacement process, find the resistivity and acoustic wave velocity at the same time and location during the corresponding calibration experiment. The oil, gas, and water three-phase fluid saturations in the numerical simulation correspond to the resistivity and acoustic wave velocity in the calibration experiment one by one. Based on this correspondence, draw a water phase saturation and resistivity relationship chart under the temperature and pressure conditions, as shown in Figure 4. Figure 3 As shown; the relationship between gas phase saturation and acoustic wave velocity, such as Figure 4 shown.

[0046] Step 5, CO 2 In the flooding physical simulation experiment, as long as the resistivity and acoustic wave velocity distribution inside the experimental model are measured, the saturation distribution of oil, gas and water phases can be obtained according to the relationship chart established in step 4. The oil phase saturation can be calculated by the following formula:

[0047] So=1-Sw-Sg

[0048] Among them, So is the oil phase saturation, Sw is the water phase saturation, and Sg is the gas phase saturation.

[0049] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for calibrating the saturation of three-phase fluids of oil, gas and water, characterized in that: A three-phase fluid saturation calibration test device of oil, gas and water is used, and the device includes a holder, a test system transmitting module, and a test system receiving module; the inner cavity of the holder is a rectangular parallelepiped, the test system transmitting module is installed on the upper surface of the holder, and the test system receiving module is installed on the lower surface of the holder; the test system receiving module is connected to a computer for data processing; the test system transmitting module is composed of a plurality of resistivity positive electrodes and a plurality of acoustic wave transmitting electrodes, which are equidistantly distributed on the upper surface of the holder; the test system receiving module is composed of a plurality of corresponding resistivity negative electrodes and a plurality of acoustic wave receiving electrodes, which are equidistantly distributed on the lower surface of the holder; the method includes the following steps: Step 1. Establish a calibration experimental model; Step 2. Conduct calibration experiments and record injection and production parameters, resistivity, and acoustic wave velocity; Step 3. Establish a numerical simulation model and fit the injection and production parameters; Step 4. Establish a graph showing the relationship between saturation, resistivity and acoustic wave velocity; Step 5. Calculate the saturation of the three-phase fluid of oil, gas and water according to the relationship diagram obtained in step 4; In step 1, a homogeneous sand filling model that meets the physical properties of the target reservoir is loaded in the device holder, the target reservoir formation fluid is prepared and saturated, and a calibration experimental model is established; In step 2, a CO2 flooding calibration experiment is carried out under the temperature and pressure conditions of the target reservoir, and the injection and production parameters at different injection PV numbers are recorded. The resistivity and acoustic wave velocity of each measuring point along the sand filling model are recorded through the test system. In step 3, according to the calibration experiment in step 2, a corresponding numerical simulation model is established to simulate the calibration displacement process and fit the historical injection and production data; In step 4, the resistivity and acoustic wave velocity data in the calibration experiment are compared with the oil, gas and water saturation distribution in the numerical simulation to establish a water phase saturation and resistivity relationship chart and a gas phase saturation and acoustic wave velocity relationship chart; In step 5, the water phase saturation and gas phase saturation are calculated based on the chart obtained in step 4. The oil phase saturation can be calculated by the following formula: So=1-Sw-Sg Among them, So is the oil phase saturation, Sw is the water phase saturation, and Sg is the gas phase saturation; The injection and production parameters include injection pressure, production pressure, oil production, water production, gas production, and production gas-oil ratio.

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