Design and evaluation method of a downhole supercritical carbon dioxide flow test tool

Abstract

The invention discloses a design and evaluation method for a downhole supercritical carbon dioxide flow rate testing tool. The design method comprises: calculating a first Reynolds number according to a test value of an inner diameter of the flow rate testing tool, different flow rates, density and dynamic viscosity; judging whether the first Reynolds number is within a standard Reynolds number range, and if so, taking the test value as a first design value; determining an inner diameter range of the flow rate testing tool according to an outer diameter and an inner diameter of the downhole tool; fixing a target flow rate among different flow rates, and calculating a second Reynolds number according to the target flow rate, each inner diameter within the inner diameter range, density and dynamic viscosity; judging whether at least one second Reynolds number is within the standard Reynolds number range, and if so, taking the inner diameter corresponding to the second Reynolds number as a second design value; and determining a standard inner diameter according to the first design value and the second design value. The flow rate testing tool with the standard inner diameter is used to test the flow rate of downhole supercritical carbon dioxide, thereby effectively improving the downhole oil displacement rate and recovery rate.

Description

Technical Field

[0001] The present invention relates to the technical field of low permeability oil reservoir recovery, and in particular to a design and evaluation method of a downhole supercritical carbon dioxide flow testing tool. Background Art

[0002] CO2 flooding technology involves injecting carbon dioxide into oil reservoirs to increase oil recovery. By injecting carbon dioxide in layers, the problem of CO2 gas crossover preventing the effective utilization of oil reservoirs can be avoided.

[0003] However, due to factors such as the small downhole space and the supercritical state of carbon dioxide under high temperature and high pressure conditions downhole, the existing surface flow testing technology cannot be directly applied to downhole stratified flow control, resulting in the key technology of stratified carbon dioxide injection being difficult to implement, and the downhole oil displacement rate and recovery rate being low.

[0004] To address the above issues, no effective solutions have been proposed so far. Summary of the Invention

[0005] The embodiments of this specification provide a design and evaluation method for a downhole supercritical carbon dioxide flow testing tool to solve the problem that existing surface flow testing technology cannot effectively improve downhole oil displacement and recovery rates.

[0006] In a first aspect, an embodiment of this specification provides a method for designing a downhole supercritical carbon dioxide flow rate testing tool, the method comprising:

[0007] Calculate the first Reynolds number corresponding to different flow rates based on the test value of the inner diameter of the flow test tool, different flow rates, and the density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0008] determining whether the first Reynolds number is within a Reynolds number standard range, and if so, using the test value as a first design value of the inner diameter of the flow test tool;

[0009] Determining an inner diameter range of a flow rate testing tool based on an outer diameter and an inner diameter of the downhole tool, wherein the flow rate testing tool is designed into the downhole tool;

[0010] Fixing a target flow rate among different flow rates, and calculating a second Reynolds number corresponding to each inner diameter based on the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0011] Determining whether there is at least one second Reynolds number within the Reynolds number standard range, and if so, using the inner diameter corresponding to the second Reynolds number as a second design value of the inner diameter of the flow test tool;

[0012] The standard inner diameter of the flow testing tool is determined according to the first design value and the second design value. The flow testing tool with the standard inner diameter is used to test the flow of supercritical carbon dioxide downhole.

[0013] In some embodiments, the calculating of the first Reynolds number corresponding to different flow rates based on the test value of the inner diameter of the flow testing tool, different flow rates, and the density and dynamic viscosity of the downhole supercritical carbon dioxide includes:

[0014] Calculating first flow velocities corresponding to different flow rates according to a test value of the inner diameter of the flow testing tool and the different flow rates;

[0015] The first Reynolds numbers corresponding to different flow rates are calculated according to the first flow rate, the density and the dynamic viscosity of the downhole supercritical carbon dioxide.

[0016] In some embodiments, determining the inner diameter range of the flow testing tool based on the outer diameter and inner diameter of the downhole tool includes:

[0017] Determine the outer wall thickness of the downhole tool according to the outer diameter of the downhole tool, and determine the inner wall thickness of the downhole tool according to the inner diameter of the downhole tool;

[0018] Determine the space allowance for the flow test tool in the downhole tool based on the outer diameter, inner diameter, outer wall thickness, and inner wall thickness of the downhole tool;

[0019] The upper limit of the inner diameter of the flow testing tool is determined according to the space margin and the inner wall thickness, and the inner diameter range of the flow testing tool is determined in combination with the preset step length.

[0020] In some embodiments, the target flow rate among the fixed different flow rates is calculated, in sequence, based on the target flow rate, each inner diameter within the inner diameter range of the flow rate testing tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide, to calculate the second Reynolds number corresponding to each inner diameter, including:

[0021] Fixing the target flow rate among different flow rates, and calculating the second flow rate corresponding to each inner diameter according to the target flow rate and each inner diameter within the inner diameter range of the flow test tool;

[0022] The second Reynolds number corresponding to each inner diameter is calculated according to the second flow rate, the density and the dynamic viscosity of the downhole supercritical carbon dioxide.

[0023] In some embodiments, determining the standard inner diameter of the flow testing tool according to the first design value and the second design value includes:

[0024] The Reynolds numbers corresponding to the first design value and the second design value are compared, and a design value having a Reynolds number greater than a preset threshold is selected from the first design value and the second design value as the standard inner diameter of the flow test tool.

[0025] In a second aspect, an embodiment of this specification further provides a method for evaluating a downhole supercritical carbon dioxide flow rate testing tool, wherein the method is applied to a flow rate testing tool evaluation system, wherein the flow rate testing tool evaluation system includes at least an oil-water storage module and a flow rate testing tool testing module;

[0026] The oil-water storage module includes, in sequence: an oil tank and a water tank, a first comparative mass flowmeter and a first injection pump, wherein the first comparative mass flowmeter is used to test the initial flow of oil and water after the valves corresponding to the oil tank and the water tank are opened, and the first injection pump is used to pump oil and water into the flow test tool test module;

[0027] The flow test tool test module sequentially includes: a mixing tank, a mixing pump, the above-mentioned flow test tool of standard inner diameter, and a second comparative mass flow meter, wherein the mixing tank is used to mix the pumped oil and water to obtain a mixed test liquid, the mixing pump is used to pump the mixed test liquid into the flow test tool of standard inner diameter, the flow test tool of standard inner diameter is used to test the flow of the mixed test liquid, and the second comparative mass flow meter is used to test the outlet flow of the mixed test liquid after the flow test tool of standard inner diameter is tested; the method includes:

[0028] Obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate and the outlet flow rate;

[0029] When the comparison is passed, comparing the outlet flow rate with the test result of the flow test tool of the standard inner diameter;

[0030] When the comparison is repeated, it is determined that the flow rate testing tool with the standard inner diameter can be used to test the flow rate of supercritical carbon dioxide downhole.

[0031] In a third aspect, the embodiments of this specification further provide a design device for a downhole supercritical carbon dioxide flow rate testing tool, the device comprising:

[0032] A first calculation module is used to calculate a first Reynolds number corresponding to different flow rates based on a test value of an inner diameter of a flow test tool, different flow rates, and the density and dynamic viscosity of downhole supercritical carbon dioxide;

[0033] a first judging module, configured to judge whether the first Reynolds number is within a Reynolds number standard range, and if so, use the test value as a first design value of the inner diameter of the flow testing tool;

[0034] A first determining module is configured to determine an inner diameter range of a flow rate testing tool according to an outer diameter and an inner diameter of the downhole tool, wherein the flow rate testing tool is designed in the downhole tool;

[0035] A second calculation module is configured to fix a target flow rate among different flow rates and calculate a second Reynolds number corresponding to each inner diameter based on the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0036] a second determining module, configured to determine whether at least one second Reynolds number is within a standard Reynolds number range, and if so, using an inner diameter corresponding to the second Reynolds number as a second design value of the inner diameter of the flow testing tool;

[0037] The second determining module is used to determine the standard inner diameter of the flow testing tool according to the first design value and the second design value. The flow testing tool with the standard inner diameter is used to test the flow of supercritical carbon dioxide downhole.

[0038] In a fourth aspect, embodiments of this specification further provide an evaluation device for a downhole supercritical carbon dioxide flow rate testing tool, the device comprising: application to a flow rate testing tool evaluation system, the flow rate testing tool evaluation system comprising at least an oil-water storage module and a flow rate testing tool testing module;

[0039] The oil-water storage module includes, in sequence: an oil tank and a water tank, a first comparative mass flowmeter and a first injection pump, wherein the first comparative mass flowmeter is used to test the initial flow of oil and water after the valves corresponding to the oil tank and the water tank are opened, and the first injection pump is used to pump oil and water into the flow test tool test module;

[0040] The flow test tool test module includes: a mixing tank, a mixing pump, the above-mentioned standard inner diameter flow test tool and a second comparative mass flow meter in sequence, wherein the mixing tank is used to mix the pumped oil and water to obtain a mixed test liquid, the mixing pump is used to pump the mixed test liquid into the standard inner diameter flow test tool, the standard inner diameter flow test tool is used to test the flow of the mixed test liquid, and the second comparative mass flow meter is used to test the outlet flow of the mixed test liquid after the standard inner diameter flow test tool is tested; the device includes:

[0041] a first comparison module, configured to obtain the initial flow rate and the outlet flow rate, and compare the initial flow rate with the outlet flow rate;

[0042] A second comparison module is used to compare the outlet flow rate with the test result of the flow test tool of the standard inner diameter when the comparison is passed;

[0043] The verification module is used to determine that the flow test tool with the standard inner diameter can be used to test the flow of supercritical carbon dioxide in the well when the comparison is passed again.

[0044] In a fifth aspect, an embodiment of this specification also provides a computer device, comprising a memory, a processor, and a computer program / instructions stored on the memory, wherein the processor executes the computer program / instructions to implement the steps of the above-mentioned design method of the downhole supercritical carbon dioxide flow testing tool or the above-mentioned evaluation method of the downhole supercritical carbon dioxide flow testing tool.

[0045] In a sixth aspect, an embodiment of this specification further provides a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the steps of the design method of the above-mentioned downhole supercritical carbon dioxide flow testing tool or the evaluation method of the above-mentioned downhole supercritical carbon dioxide flow testing tool.

[0046] The embodiments of this specification provide a method for designing a downhole supercritical carbon dioxide flow rate measurement tool. First, a first Reynolds number corresponding to different flow rates is calculated based on a test value of the flow rate measurement tool's inner diameter, different flow rates, and the density and dynamic viscosity of downhole supercritical carbon dioxide. Next, a determination is made as to whether the first Reynolds number is within a standard Reynolds number range. If so, the test value is used as a first design value for the flow rate measurement tool's inner diameter. Next, an inner diameter range for the flow rate measurement tool is determined based on the outer diameter and inner diameter of the downhole tool. The flow rate measurement tool is designed into the downhole tool. Next, a target flow rate is fixed for each of the different flow rates. Second Reynolds numbers corresponding to each inner diameter are calculated, sequentially based on the target flow rate, each inner diameter within the flow rate measurement tool's inner diameter range, and the density and dynamic viscosity of downhole supercritical carbon dioxide. Next, a determination is made as to whether at least one second Reynolds number is within the standard Reynolds number range. If so, the inner diameter corresponding to the second Reynolds number is used as a second design value for the flow rate measurement tool's inner diameter. Finally, a standard inner diameter for the flow rate measurement tool is determined based on the first and second design values. A flow measurement tool with a standard inner diameter is used to measure the flow rate of downhole supercritical carbon dioxide. Through the above scheme, a flow testing tool (flow testing tool with standard inner diameter) that meets the requirements of miniaturized design and variable density fluid can be designed and developed, which meets the technical requirements of supercritical carbon dioxide downhole small space flow testing and effectively solves the problem that the existing technology cannot perform downhole supercritical carbon dioxide downhole flow testing, resulting in low downhole oil displacement rate and recovery rate.

[0047] An embodiment of the present specification provides an evaluation method for a downhole supercritical carbon dioxide flow test tool. The method is applied to a flow test tool evaluation system, wherein the flow test tool evaluation system includes at least an oil-water storage module and a flow test tool test module. The oil-water storage module sequentially includes: an oil tank and a water tank, a first comparative mass flowmeter, and a first injection pump. The first comparative mass flowmeter is used to test the initial flow rates of oil and water after the valves corresponding to the oil tank and the water tank are opened, and the first injection pump is used to pump oil and water into the flow test tool test module. The flow test tool test module sequentially includes: a mixing tank, a mixing pump, the above-mentioned standard inner diameter flow test tool, and a second comparative mass flowmeter. The mixing tank is used to mix the pumped oil and water to obtain a mixed test fluid. The mixing pump is used to pump the mixed test fluid into the standard inner diameter flow test tool. The standard inner diameter flow test tool is used to test the flow rate of the mixed test fluid. The second comparative mass flowmeter is used to test the outlet flow rate of the mixed test fluid after the standard inner diameter flow test tool is tested. The method includes: first, obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate and the outlet flow rate. Then, if the comparison is successful, the outlet flow rate is compared with the test results of the flow test tool with the standard inner diameter. Finally, if the comparison is successful again, it is determined that the flow test tool with the standard inner diameter can be used to measure the flow rate of supercritical carbon dioxide downhole. This solution effectively verifies that the flow test tool with the standard inner diameter is not affected by the density and viscosity of the medium during measurement, and that the flow test tool with the standard inner diameter is non-contact measurement, thereby improving the feasibility of flow measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0049] Figure 1 This is a flow chart of a design method for a downhole supercritical carbon dioxide flow testing tool provided in an embodiment of this specification;

[0050] Figure 2 is a graph showing the relationship between the Strouhal number of a triangular prism-shaped vortex generator and the Reynolds number of a pipe provided in an embodiment of this specification;

[0051] Figure 3 It is a two-dimensional schematic diagram of the outer diameter and inner diameter provided in the embodiment of this specification;

[0052] Figure 4is a schematic diagram of an evaluation system for a flow rate testing tool provided in an embodiment of this specification;

[0053] Figure 5 This is a flow chart of an evaluation method for a downhole supercritical carbon dioxide flow testing tool provided in an embodiment of this specification;

[0054] Figure 6 This is a schematic diagram of the structure of a design device for a downhole supercritical carbon dioxide flow rate testing tool provided in an embodiment of this specification;

[0055] Figure 7 This is a schematic diagram of the structure of an evaluation device for a downhole supercritical carbon dioxide flow rate testing tool provided in an embodiment of this specification;

[0056] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this specification.

[0057] Description of reference numerals:

[0058] 1. Oil tank; 2. Water tank; 3. First comparative mass flowmeter; 4. First injection pump; 5. Mixing tank; 6. Mixing pump; 7. Pressure gauge; 8. Flow test tool; 9. Second comparative mass flowmeter; 10. Oil-water separator; 11. Oil storage tank; 12. Water storage tank; 13. Second injection pump. DETAILED DESCRIPTION

[0059] To help those skilled in the art better understand the technical solutions in this specification, the following will provide a clear and complete description of the technical solutions in the embodiments of this specification, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. All other embodiments derived by those skilled in the art based on the embodiments in this specification without creative effort shall fall within the scope of protection of this specification.

[0060] Affected by factors such as the small downhole space and the change in the flow state of supercritical carbon dioxide, ground flow testing technology cannot be directly applied to downhole stratified flow control, resulting in the difficulty in realizing the key technology of stratified carbon dioxide injection, which restricts the oil displacement and recovery effects. In response to the above-mentioned problems existing in the existing methods and the specific reasons for the above-mentioned problems, this application considers introducing a design and evaluation method for a downhole supercritical carbon dioxide flow testing tool. In view of the fact that carbon dioxide is in a supercritical state under high temperature and high pressure conditions in the wellbore, its properties are special, and the phase state, viscosity, and density of the fluid change greatly due to changes in temperature and pressure, the ground flow testing technology cannot be directly applied to downhole stratified flow control. A flow testing tool that can meet the metering needs of supercritical carbon dioxide in a small downhole space is designed, and the accuracy of the flow testing tool in testing downhole supercritical carbon dioxide flow is verified.

[0061] Based on the above-mentioned ideas, this specification proposes a design method for a downhole supercritical carbon dioxide flow rate measurement tool. First, a first Reynolds number corresponding to different flow rates is calculated based on the test value of the flow rate measurement tool's inner diameter, different flow rates, and the density and dynamic viscosity of downhole supercritical carbon dioxide. Then, a determination is made as to whether the first Reynolds number is within a standard Reynolds number range. If so, the test value is used as a first design value for the flow rate measurement tool's inner diameter. Next, a range of inner diameters for the flow rate measurement tool is determined based on the outer diameter and inner diameter of the downhole tool. The flow rate measurement tool is designed into the downhole tool. Next, a target flow rate is fixed for each of the different flow rates. Second Reynolds numbers corresponding to each inner diameter are calculated, sequentially based on the target flow rate, each inner diameter within the flow rate measurement tool's inner diameter range, and the density and dynamic viscosity of downhole supercritical carbon dioxide. A determination is then made as to whether at least one second Reynolds number is within the standard Reynolds number range. If so, the inner diameter corresponding to the second Reynolds number is used as a second design value for the flow rate measurement tool's inner diameter. Finally, a standard inner diameter for the flow rate measurement tool is determined based on the first and second design values. A flow measurement tool with a standard inner diameter is used to measure the flow rate of downhole supercritical carbon dioxide.

[0062] This specification also provides a method for evaluating a downhole supercritical carbon dioxide flow test tool. The method is applied to a flow test tool evaluation system, wherein the flow test tool evaluation system includes at least an oil-water storage module and a flow test tool test module. The oil-water storage module includes, in sequence, an oil tank and a water tank, a first comparative mass flowmeter, and a first injection pump. The first comparative mass flowmeter is used to test the initial flow rates of oil and water after the valves corresponding to the oil tank and water tank are opened, and the first injection pump is used to pump oil and water into the flow test tool test module. The flow test tool test module includes, in sequence, a mixing tank, a mixing pump, the above-mentioned standard inner diameter flow test tool, and a second comparative mass flowmeter. The mixing tank is used to mix the pumped oil and water to obtain a mixed test fluid. The mixing pump is used to pump the mixed test fluid into the standard inner diameter flow test tool. The standard inner diameter flow test tool is used to test the flow rate of the mixed test fluid. The second comparative mass flowmeter is used to test the outlet flow rate of the mixed test fluid after the standard inner diameter flow test tool is tested. The method includes: first, obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate and the outlet flow rate. Then, when the comparison is passed, the outlet flow rate is compared with the test result of the flow test tool of the standard inner diameter. Finally, when the comparison is passed again, it is determined that the flow test tool of the standard inner diameter can be used to test the flow rate of downhole supercritical carbon dioxide.

[0063] It should be noted that the terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of this application.

[0064] See Figure 1 As shown, the embodiment of this specification provides a design method for a downhole supercritical carbon dioxide flow rate testing tool. In specific implementation, the method may include the following contents.

[0065] S101: Calculating first Reynolds numbers corresponding to different flow rates based on a test value of an inner diameter of a flow rate testing tool, different flow rates, and the density and dynamic viscosity of downhole supercritical carbon dioxide.

[0066] In some embodiments, the flow test tool can be used to test flow, control flow, etc. The test value of the inner diameter of the flow test tool is the test value of the inner diameter of the pipeline, which can be set according to actual needs, such as 15mm. The different flow rates can be set according to the needs of the on-site working conditions, such as 5m 3 / d, 10m 3 / d, 20m 3 / d, 30m 3 / d, 40m3 / d, 50m 3 / d, which is not specifically limited in this specification. The density and dynamic viscosity of the above-mentioned downhole supercritical carbon dioxide can be the density and dynamic viscosity of the supercritical carbon dioxide obtained at the average temperature and average pressure downhole, such as: at a pressure of 45MPa and a temperature of 60°C, the density of the supercritical carbon dioxide obtained is 913.29Kg / m3, and the dynamic viscosity of the supercritical carbon dioxide obtained is 9.48×10 -5 Pa.s. The Reynolds number (Re) is a dimensionless number in fluid mechanics used to describe the state of fluid motion. Pre-test values ​​for the flow test tool's inner diameter, various flow rates, and the density and dynamic viscosity of downhole supercritical carbon dioxide can be obtained. Based on this data, the first Reynolds number corresponding to various flow rates can be calculated, providing a data foundation for subsequently determining the standard inner diameter of the flow test tool.

[0067] In some embodiments, the above S101, based on the test value of the inner diameter of the flow testing tool, different flow rates, density and dynamic viscosity of the downhole supercritical carbon dioxide, calculates the first Reynolds number corresponding to different flow rates. In specific implementation, it may include:

[0068] S11: calculating first flow velocities corresponding to different flow rates according to a test value of the inner diameter of the flow test tool and the different flow rates;

[0069] S12: Calculating first Reynolds numbers corresponding to different flow rates based on the first flow rate, density and dynamic viscosity of the downhole supercritical carbon dioxide.

[0070] In some embodiments, the specific process of calculating the first flow rate corresponding to different flow rates in S11 is as follows:

[0071] It can be assumed that the on-site working conditions require a flow rate of 5m 3 / d, 10m 3 / d, 20m 3 / d, 30m 3 / d, 40m 3 / d, 50m 3 / d, the test value of the inner diameter of the flow test tool (inner diameter of the pipe) is 15mm, then according to the circular area formula: s=πr 2 , the cross-sectional area of ​​the pipe is 0.000176625m 2 Substitute the pipe cross-sectional area and different flow rates into the velocity calculation formula (1):

[0072]

[0073] Where q is the fluid flow rate, m 3 / d; s is the cross-sectional area of ​​the pipe, m2 .

[0074] It can be concluded that:

[0075] 5m 3 The first flow rate corresponding to the flow rate of / d is:

[0076] 10m 3 The first flow rate corresponding to the flow rate of / d is:

[0077] 20m 3 The first flow rate corresponding to the flow rate of / d is:

[0078] 30m 3 The first flow rate corresponding to the flow rate of / d is:

[0079] 40m 3 The first flow rate corresponding to the flow rate of / d is:

[0080] 50m 3 The first flow rate corresponding to the flow rate of / d is:

[0081] The calculation process of the first flow rate above involves unit conversion, converting days into seconds, and accordingly dividing by 24 hours, 60 minutes, and 60 seconds.

[0082] The specific process of calculating the first Reynolds number corresponding to different flow rates in the above S12 is as follows:

[0083] The density and dynamic viscosity of supercritical carbon dioxide at a pressure of 45 MPa and a temperature of 60°C can be obtained as follows: 913.29 kg / m 3 、9.48.10 -5 Pa.s. Substitute the first flow rate, density and dynamic viscosity of supercritical carbon dioxide corresponding to the different flow rates calculated above into the Reynolds number calculation formula (2):

[0084]

[0085] Where Re is the Reynolds number; v is the flow velocity; ρ is the density; μ is the dynamic viscosity; and d is the inner diameter of the pipe.

[0086] It can be concluded that:

[0087] 5m 3 The first Reynolds number corresponding to the flow rate of / d is:

[0088] 10m 3The first Reynolds number corresponding to the flow rate of / d is:

[0089] 20m 3 The first Reynolds number corresponding to the flow rate of / d is:

[0090] 30m 3 The first Reynolds number corresponding to the flow rate of / d is:

[0091] 40m 3 The first Reynolds number corresponding to the flow rate of / d is:

[0092] 50m 3 The first Reynolds number corresponding to the flow rate of / d is:

[0093] Summarizing the above data, we can get Table 1 (Sc-CO2 in Table 1 is supercritical carbon dioxide):

[0094] Table 1 The first Reynolds number corresponding to different flow rates

[0095]

[0096] S102: Determine whether the first Reynolds number is within a Reynolds number standard range; if so, use the test value as a first design value of the inner diameter of the flow testing tool.

[0097] In some embodiments, based on the "Karman vortex" principle, the correlation between the Strouhal number Sr and the Reynolds number Re can be analyzed, and the standard range of the Reynolds number Re corresponding to a fixed value of the Strouhal number Sr can be determined. Then, a flow test tool that can be used to test downhole supercritical carbon dioxide can be designed in combination with the Reynolds number standard range.

[0098] Specifically, the instrument factor K of the flow test tool is affected by the mechanical structure size and the Strouhal number Sr. The Strouhal number Sr is a dimensionless parameter that is related to the shape of the vortex generator and the Reynolds number Re. The Reynolds number Re is affected by the density and viscosity of the fluid. Figure 2 As shown, Figure 2 The relationship between the Strouhal number of the triangular prism vortex generator and the Reynolds number of the pipe is shown in Figure 5×10 3 -7×10 6 In order to determine the possible range, the Reynolds number Re≥2×10 4 -7×10 6 Within the range (2×10 4 -7×10 6 The Strouhal number Sr can be regarded as a constant. Under normal or abnormal process conditions, the Reynolds number is higher than 4×104 Better, this is the normal operating range of the instrument. Therefore, the Reynolds number standard range can be set to 4×10 4 -7×10 6 This range represents the normal operating range of the flow test tool. Within this range, the Strouhal number remains essentially unchanged, and the Reynolds number is linearly related to the flow rate, independent of fluid properties such as viscosity. The first Reynolds number corresponding to different flow rates and the second Reynolds number corresponding to various inner diameters of the flow test tool in actual use can be calculated. By comparing and analyzing the first and second Reynolds numbers with the standard Reynolds number range, the optimal inner diameter of the flow test tool, i.e., the standard inner diameter of the flow test tool, can be determined. The specific method for determining the standard inner diameter will be explained later and is not specifically limited in this specification.

[0099] In some embodiments, referring to Table 1 above, it can be seen that the first Reynolds number corresponding to the different flow rates calculated above meets the Reynolds number standard range of 4×10 4 -7×10 6 , that is, within the standard Reynolds number range. Therefore, the Reynolds number can be used as an important condition for the design of flow test tools. The test value of the flow test tool's inner diameter, 15mm, can be used as the first design value of the flow test tool's inner diameter. This first design value can be understood as a theoretical value. Subsequently, the second design value in actual application (or actual working conditions) can be combined to determine the standard inner diameter of the flow test tool. This can improve the accuracy of the determination of the standard inner diameter of the flow test tool, thereby meeting the technical requirements for supercritical carbon dioxide downhole small space flow testing.

[0100] S103: Determine an inner diameter range of a flow rate testing tool according to an outer diameter and an inner diameter of the downhole tool, wherein the flow rate testing tool is designed in the downhole tool.

[0101] In some embodiments, the downhole tool may be a pressure vessel, and the flow rate testing tool may be designed into the downhole tool. The outer diameter and inner diameter of the downhole tool may be: outer diameter ≤ 114 mm, inner diameter ≥ 40 mm, respectively, and these values ​​are determined based on actual working conditions.

[0102] In some embodiments, the above-mentioned step S103 of determining the inner diameter range of the flow rate testing tool according to the outer diameter and inner diameter of the downhole tool may include:

[0103] S21: determining an outer wall thickness of the downhole tool according to an outer diameter of the downhole tool, and determining an inner wall thickness of the downhole tool according to an inner diameter of the downhole tool;

[0104] S22: determining a space margin for the flow testing tool in the downhole tool based on the outer diameter, inner diameter, outer wall thickness, and inner wall thickness of the downhole tool;

[0105] S23: Determine the upper limit of the inner diameter of the flow testing tool according to the space margin and the inner wall thickness, and determine the inner diameter range of the flow testing tool in combination with the preset step length.

[0106] In some embodiments, the calculation process of the outer wall thickness and the inner wall thickness of the downhole tool in S21 is as follows:

[0107] Substitute the outer diameter of the downhole tool = 114 mm (D is 114 mm) and the inner diameter of the downhole tool = 40 mm (D is 40 mm) into the pressure vessel wall thickness formula (3) to calculate the outer wall thickness and inner wall thickness of the downhole tool:

[0108]

[0109] Among them, p is pressure (MPa), p=50; s is wall thickness (mm); r is yield strength (MPa), 552 (the yield strength of material 13Cr is 552); D is diameter (mm).

[0110] The design results:

[0111]

[0112] s 内 =s 内1 +0.7=2.5mm

[0113] It should be noted that s 外 That is the outer wall thickness of the above-mentioned downhole tool, s 内 is the inner wall thickness of the above-mentioned downhole tool, 0.7 is the safety factor, s 内1 is the inner wall thickness without considering the safety factor.

[0114] The calculation process of the space margin of the flow rate test tool in the downhole tool in S22 is as follows:

[0115] Combined with the above s 外 5.2mm, s 内 The inner diameter of the downhole tool is 2.5mm, the outer diameter is 114mm, and the inner diameter is 40mm. It can be obtained that: the inner diameter of the downhole tool = inner diameter + 2s 内 =40mm+2×2.5mm=45mm, outer diameter of downhole tool = outer diameter - 2s 外 =114mm-2×5.2mm=103.6mm, the space margin of the flow test tool in the downhole tool = (outer diameter-inner diameter) / 2=(103.6mm-45mm) / 2=29.3mm. Figure 3 As shown, Figure 3 is a two-dimensional schematic diagram of the outer diameter and inner diameter. Figure 3It shows an outer diameter of 114 mm, an outer diameter of 103.6 mm, an inner diameter of 45 mm, an inner diameter of 40 mm, and a space margin of 29.3 mm. The symbol Φ in the figure can be omitted, and the symbol can represent the diameter of an ordinary circle.

[0116] The specific process of determining the upper limit of the inner diameter of the flow test tool in S23 is as follows:

[0117] First, determine the maximum outer diameter of the flow testing tool based on the space margin. Taking into account the processing design requirements, threaded socketing is required, and a processing size of 1.8mm must be reserved. Therefore, the maximum outer diameter of the flow testing tool can be determined to be: 29.3mm-1.8mm=27.5mm. The maximum outer diameter can be a target outer diameter that is greater than the preset outer diameter threshold. The preset outer diameter threshold can be set according to actual needs, and this manual does not make specific restrictions on this.

[0118] The upper limit of the flow test tool's inner diameter can then be determined based on the tool's maximum outer diameter (target outer diameter) of 27.5 mm and the downhole tool's inner wall thickness of 2.5 mm. That is, the flow test tool's inner diameter upper limit = 27.5 mm - 2 × 2.5 mm = 22.5 mm. Since the inner diameter of a flow test tool is generally an integer, the upper limit is d ≤ 22 mm.

[0119] After that, you can pre-set the preset step length (for example, you can set it to 5 test steps, test from the largest size downwards, stop if the test meets the requirements, and continue testing if it does not meet the requirements). At this time, the inner diameter range of the flow test tool is 17mm-22mm, that is, d=22mm, d=21mm, d=20mm, d=19mm, d=18mm, d=17mm. Subsequently, you can calculate the second Reynolds number corresponding to the inner diameters of 22mm, 21mm, 20mm, 19mm, 18mm, and 17mm, and then determine the inner diameter design value that meets the actual working conditions.

[0120] S104: fixing a target flow rate among different flow rates, and calculating a second Reynolds number corresponding to each inner diameter according to the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of downhole supercritical carbon dioxide.

[0121] In some embodiments, the target flow rate may be the minimum flow rate of different flow rates, such as: 5m 3 / d. Due to the high requirements and difficulty of small flow testing, other flow verifications are required only after the small flow can meet the test requirements.

[0122] In some embodiments, the target flow rate among the fixed different flow rates in S104 is calculated, in sequence, based on the target flow rate, each inner diameter within the inner diameter range of the flow rate testing tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide, and the second Reynolds number corresponding to each inner diameter is calculated. In specific implementation, the following steps may be included:

[0123] S31: fixing a target flow rate among different flow rates, and calculating a second flow rate corresponding to each inner diameter according to the target flow rate and each inner diameter within the inner diameter range of the flow test tool;

[0124] S32: Calculating a second Reynolds number corresponding to each inner diameter according to the second flow rate, the density and dynamic viscosity of the downhole supercritical carbon dioxide.

[0125] In some embodiments, the specific process of calculating the second flow rate corresponding to each inner diameter in S31 is as follows:

[0126] Target flow rate is 5m 3 / d, the inner diameters within the inner diameter range are 22mm, 21mm, 20mm, 19mm, 18mm, and 17mm. The corresponding cross-sectional area can be calculated based on the inner diameter using the above circular area formula. Then, the calculated corresponding cross-sectional area and target flow rate are substituted into the above flow rate calculation formula (1) to calculate the second flow rate corresponding to each inner diameter as follows:

[0127] When d = 22 mm, 5 m 3 / d flow rate, the corresponding second flow rate is:

[0128] When d = 21 mm, 5 m 3 / d flow rate, the corresponding second flow rate is:

[0129] When d = 20 mm, 5 m 3 / d flow rate, the corresponding second flow rate is:

[0130] When d = 19 mm, 5 m 3 / d flow rate, the corresponding second flow rate is:

[0131] When d = 18 mm, 5 m 3 / d flow rate, the corresponding second flow rate is:

[0132] When d = 17 mm, 5 m 3 / d flow rate, the corresponding second flow rate is:

[0133] The specific process of calculating the second Reynolds number corresponding to each inner diameter in the above S32 is as follows:

[0134] Substituting the second flow rate, density and dynamic viscosity of supercritical carbon dioxide corresponding to each inner diameter calculated above into the above Reynolds number calculation formula (2), the second Reynolds number corresponding to each inner diameter is calculated as follows:

[0135] When d=22mm, the corresponding second Reynolds number is:

[0136] When d=21mm, the corresponding second Reynolds number is:

[0137] When d = 20 mm, the corresponding second Reynolds number is:

[0138] When d=19mm, the corresponding second Reynolds number is:

[0139] When d=18mm, the corresponding second Reynolds number is:

[0140] When d=17mm, the corresponding second Reynolds number is:

[0141] Summarizing the above data, we can get Table 2:

[0142] Table 2 The second Reynolds number corresponding to each inner diameter

[0143]

[0144] S105: Determine whether there is at least one second Reynolds number within the Reynolds number standard range; if so, use the inner diameter corresponding to the second Reynolds number as a second design value of the inner diameter of the flow testing tool.

[0145] In some embodiments, it can be seen from Table 2 above that when d=17 mm, the corresponding second Reynolds number is 41762, which is 4×10 4 -7×10 6 When d>17mm, the corresponding second Reynolds number is not within the Reynolds number standard range. Therefore, 17mm can be used as the upper limit of the inner diameter of the flow test tool. In other words, when there is at least one second Reynolds number within the Reynolds number standard range, the inner diameter corresponding to the second Reynolds number can be used as the second design value of the inner diameter of the flow test tool. The second design value can be understood as the inner diameter design value combined with actual working conditions, which is more in line with working conditions than the first design value.

[0146] S106: Determine a standard inner diameter of a flow testing tool according to the first design value and the second design value. The flow testing tool with the standard inner diameter is used to test the flow rate of supercritical carbon dioxide downhole.

[0147] In some embodiments, determining the standard inner diameter of the flow testing tool according to the first design value and the second design value in S106 may include:

[0148] The Reynolds numbers corresponding to the first design value and the second design value are compared, and a design value having a Reynolds number greater than a preset threshold is selected from the first design value and the second design value as the standard inner diameter of the flow test tool.

[0149] In some embodiments, the first design value can be 15 mm, and the upper limit of the second design value can be 17 mm. Referring to Table 1 and Table 2, the Sc-CO2 Reynolds number corresponding to the second design value is 41762, and the Sc-CO2 Reynolds number corresponding to the first design value is greater than 41762. A design value with a Reynolds number greater than a preset threshold value can be selected, that is, the design value with a larger Reynolds number between the first design value and the second design value can be selected as the standard inner diameter of the flow test tool. For example, the first design value of 15 mm is selected as the standard inner diameter of the flow test tool. In addition, the upper limit of the inner diameter of the flow test tool is 17 mm. Considering the convenience of processing and the existing industry size, the standard inner diameter can be set to 15 mm. The Reynolds number Re should be between 4×10 4 -7×10 6 Within the standard range, the larger the outer diameter, the higher the reliability in processing and on-site application.

[0150] Based on the above embodiments, a standard inner diameter flow test tool can be designed for measuring the flow rate of supercritical carbon dioxide downhole. This standard inner diameter flow test tool is a tool that meets the requirements of small-scale design and variable density fluid flow testing, meeting the technical requirements of supercritical carbon dioxide downhole flow testing in small spaces.

[0151] The following is a verification or evaluation of the accuracy of the standard inner diameter flow test tool in testing the downhole supercritical carbon dioxide flow rate. The flow test tool evaluation method used in the flow test tool evaluation system can be used for verification or evaluation. Figure 4 As shown, the flow test tool evaluation system may include at least an oil-water storage module and a flow test tool testing module.

[0152] The oil-water storage module may include: an oil tank 1 and a water tank 2, a first comparative mass flow meter 3 and a first injection pump 4. The first comparative mass flow meter 3 may be used to control the valves corresponding to the oil tank 1 and the water tank 2 (the valves are specifically Figure 4After the valves between the oil tank, the water tank and the first comparison mass flowmeter are opened, the initial flow of oil and water is tested. The first injection pump 4 can be used to pump oil and water into the test module of the flow test tool;

[0153] The flow testing tool test module may include, in sequence: a mixing tank 5, a mixing pump 6, the above-mentioned standard inner diameter flow testing tool 8 and a second comparative mass flow meter 9. The mixing tank 5 can be used to mix the pumped oil and water to obtain a mixed test liquid. The mixing pump 6 can be used to pump the mixed test liquid into the standard inner diameter flow testing tool 8. The standard inner diameter flow testing tool 8 can be used to test the flow of the mixed test liquid. The second comparative mass flow meter 9 can be used to test the outlet flow of the mixed test liquid after the standard inner diameter flow testing tool 8 is tested.

[0154] In some embodiments, the above-mentioned flow test tool evaluation system may further include an oil-water separation module, which may include in sequence: an oil-water separator 10, an oil storage tank 11, a water storage tank 12, and a second injection pump 13. The oil-water separator 10 may be used to separate the oil and water in the mixed test liquid of the flow test tool test module. The separated oil may be stored in the oil storage tank 11, and the separated water may be stored in the water storage tank 12. The oil in the oil storage tank 11 and the water in the water storage tank 12 may be pumped into the corresponding oil tank 1 and water tank 2 in the oil-water storage module through the second injection pump 13 to achieve the purpose of recycling.

[0155] See Figure 5 As shown, an evaluation method for a downhole supercritical carbon dioxide flow testing tool provided in an embodiment of this specification may include the following contents.

[0156] S501: Obtain the initial flow rate and the outlet flow rate, and compare the initial flow rate and the outlet flow rate;

[0157] S502: When the comparison passes, compare the outlet flow rate with the test result of the flow rate test tool of the standard inner diameter;

[0158] S503: When the comparison is passed again, it is determined that the flow rate testing tool with the standard inner diameter can be used to test the flow rate of downhole supercritical carbon dioxide;

[0159] In some embodiments, a two-phase fluid indoor evaluation method can be designed based on equivalent density to verify the accuracy of the standard inner diameter flow test tool in testing the downhole supercritical carbon dioxide flow rate. 3 ) and industrial white oil (density 830kg / m 3) is designed to use a variable-density two-phase fluid mixture test fluid to simulate the density changes of supercritical carbon dioxide underground. Since the density and viscosity of supercritical carbon dioxide change with temperature and pressure, by mixing industrial white oil and water in different proportions and varying the density, the density and viscosity changes of supercritical carbon dioxide underground can be simulated. This verifies that the flow test tool is not affected by the density and viscosity of the medium during measurement, and that the flow test tool is a non-contact meter, thus improving the feasibility of flow measurement.

[0160] In some embodiments, the mixing tank is used to mix the pumped oil and water in proportion, and the density of the obtained mixed test liquid can be controlled within the range of 830 kg / m 3 ~1000kg / m 3 , simulating the changes in density and viscosity of supercritical carbon dioxide underground.

[0161] When the density of the mixed test liquid is controlled to be 830 kg / m 3 The steps for verifying or evaluating the flow test tool based on the above flow test tool evaluation system are as follows:

[0162] Step 1: Prepare the corresponding mixed test liquid. Open the corresponding valves of oil tank 1 and water tank 2, start the first comparative mass flow meter 3 and injection pump 4, and input white oil and water into the mixing tank 5 through the injection pump 4 for mixing to obtain the mixed test liquid;

[0163] Step 2: Flow comparison. Open the front valve of the mixed pump 6 and start the mixed pump 6, then start the flow test tool 8 and the second comparison mass flow meter 9, record the data in the pressure gauge 7, the flow test tool 8, and the second comparison mass flow meter 9, and first compare the data tested by the first comparison mass flow meter 3 (such as: inlet flow or initial flow) and the data tested by the second comparison mass flow meter 9 (such as: outlet flow). If the comparison result is consistent, the comparison is passed, indicating that the system is in a stable state. Afterwards, the data tested by the flow test tool 8 and the data tested by the second comparison mass flow meter 9 can be compared. If the comparison result is consistent, the comparison is passed, indicating that the flow test tool 8 has a high accuracy in testing the simulated downhole supercritical carbon dioxide flow rate, and it can be used to test the flow rate of downhole supercritical carbon dioxide.

[0164] Step 3: Test liquid recovery. The two valves downstream of the oil-water separator 10 are opened, allowing the bottom water to flow into the water storage tank 12 and the upper white oil to be collected in the oil storage tank 11. The separated liquid is then pumped into the oil tank 1 and water tank 2 via the second injection pump 13 for subsequent testing.

[0165] Based on the "Kármán vortex" principle, this study analyzes the correlation between the Strouhal number (Sr) and the Reynolds number (Re). The study then determines the standard range of Reynolds numbers (Re) corresponding to a given Strouhal number (Sr). This allows the design of a flow rate measurement tool. Furthermore, based on equivalent density, an indoor two-phase fluid evaluation method was developed to verify the accuracy of downhole supercritical carbon dioxide flow rate measurements.

[0166] Compared with the prior art, the present invention has the following beneficial effects:

[0167] The design and development of a tool for testing variable-density fluid flow rates, which meets the requirements of downhole CO2 flooding, has been validated through laboratory evaluation. This tool provides an effective means for downhole flow testing of CO2 flooding, enhances the ability to precisely test and control gas flooding fluids in complex environments, and lays the foundation for further enhancing CCUS EOR. This technological breakthrough and application will effectively advance the state-of-the-art in CCUS wellbore processes.

[0168] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. For details, please refer to the description of the aforementioned related processing embodiments, and no further description is given here.

[0169] The above describes the present invention. However, it is worth noting that this specific embodiment is only intended to better illustrate the present application and to describe specific embodiments of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0170] Although this specification provides examples such as the following examples or the accompanying Figure 6The method operation steps or device structure shown, but based on routine or no creative labor, the method or device may include more or fewer operation steps or module units after partial merger. In the steps or structures that do not logically have a necessary causal relationship, the execution order of these steps or the module structure of the device is not limited to the execution order or module structure shown in the embodiments or drawings of this specification. When the method or module structure described is applied to an actual device, server or terminal product, it can be executed sequentially or in parallel according to the method or module structure shown in the embodiments or drawings (for example, a parallel processor or multi-threaded processing environment, or even a distributed processing or server cluster implementation environment). Based on the above-mentioned design method for a downhole supercritical carbon dioxide flow test tool, the embodiments of this specification also propose an embodiment of a design device for a downhole supercritical carbon dioxide flow test tool. As Figure 6 As shown, the device may specifically include the following modules:

[0171] The first calculation module 601 can be used to calculate the first Reynolds number corresponding to different flow rates based on the test value of the inner diameter of the flow test tool, different flow rates, and the density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0172] A first determination module 602 may be configured to determine whether the first Reynolds number is within a standard Reynolds number range, and if so, use the test value as a first design value of the inner diameter of the flow test tool;

[0173] A first determining module 603 may be used to determine an inner diameter range of a flow rate testing tool according to an outer diameter and an inner diameter of the downhole tool, wherein the flow rate testing tool is designed in the downhole tool;

[0174] The second calculation module 604 can be used to fix a target flow rate among different flow rates and calculate a second Reynolds number corresponding to each inner diameter based on the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0175] The second determination module 605 may be configured to determine whether at least one second Reynolds number is within a standard Reynolds number range, and if so, use the inner diameter corresponding to the second Reynolds number as a second design value of the inner diameter of the flow test tool;

[0176] The second determining module 606 may be configured to determine a standard inner diameter of a flow testing tool according to the first design value and the second design value. The flow testing tool with a standard inner diameter is used to test the flow of supercritical carbon dioxide downhole.

[0177] In some embodiments, the above-mentioned first calculation module 601 can be specifically used to calculate the first flow rate corresponding to different flow rates based on the test value of the inner diameter of the flow testing tool and the different flow rates; and calculate the first Reynolds number corresponding to different flow rates based on the first flow rate, the density and dynamic viscosity of the downhole supercritical carbon dioxide.

[0178] In some embodiments, the above-mentioned first determination module 603 can be specifically used to determine the outer wall thickness of the downhole tool based on the outer diameter of the downhole tool, and determine the inner wall thickness of the downhole tool based on the inner diameter of the downhole tool; determine the space margin of the flow testing tool in the downhole tool based on the outer diameter, inner diameter, outer wall thickness and inner wall thickness of the downhole tool; determine the upper limit of the inner diameter of the flow testing tool based on the said space margin and inner wall thickness, and determine the inner diameter range of the flow testing tool in combination with the preset step size.

[0179] In some embodiments, the above-mentioned second calculation module 604 can be specifically used to fix the target flow rate among different flow rates, and calculate the second flow rate corresponding to each inner diameter according to the target flow rate and each inner diameter within the inner diameter range of the flow testing tool; and calculate the second Reynolds number corresponding to each inner diameter according to the second flow rate, the density and dynamic viscosity of the downhole supercritical carbon dioxide.

[0180] In some embodiments, the second determination module 606 can be specifically used to compare the Reynolds numbers corresponding to the first design value and the second design value, and select a design value whose Reynolds number is greater than a preset threshold from the first design value and the second design value as the standard inner diameter of the flow testing tool.

[0181] As can be seen from the above, based on the design device of a downhole supercritical carbon dioxide flow testing tool provided in the embodiment of this specification, a flow testing tool with a standard inner diameter that meets the requirements of miniaturized design and variable density fluid flow testing can be designed and developed, meeting the technical requirements of downhole supercritical carbon dioxide small space flow testing, and effectively solving the problem that the existing technology cannot perform downhole supercritical carbon dioxide downhole flow testing, resulting in low downhole oil displacement rate and recovery rate.

[0182] Based on the above-mentioned evaluation method of a downhole supercritical carbon dioxide flow test tool, the embodiment of this specification also proposes an embodiment of an evaluation device for a downhole supercritical carbon dioxide flow test tool. Figure 7 As shown, the device may specifically include the following modules:

[0183] The first comparison module 701 may be used to obtain the initial flow rate and the outlet flow rate, and compare the initial flow rate and the outlet flow rate;

[0184] The second comparison module 702 may be used to compare the outlet flow rate with the test result of the flow test tool of the standard inner diameter when the comparison is passed;

[0185] The verification module 703 can be used to determine that the flow rate testing tool with the standard inner diameter can be used to test the flow rate of downhole supercritical carbon dioxide when the comparison is passed again.

[0186] The embodiments of this specification also provide an electronic device based on the above-mentioned design method of the downhole supercritical carbon dioxide flow test tool or the evaluation method of the downhole supercritical carbon dioxide flow test tool, including a processor and a memory for storing programs / instructions executable by the processor. When the processor is specifically implemented, the following steps can be performed according to the program / instructions: according to the test value of the inner diameter of the flow test tool, different flow rates, the density and dynamic viscosity of the downhole supercritical carbon dioxide, the first Reynolds number corresponding to the different flow rates is calculated; whether the first Reynolds number is within the Reynolds number standard range is determined, and if so, the test value is used as the first design value of the inner diameter of the flow test tool; according to the outer diameter of the downhole tool and inner diameter, determine the inner diameter range of the flow testing tool, the flow testing tool is designed in the downhole tool; fix the target flow rate among different flow rates, and calculate the second Reynolds number corresponding to each inner diameter according to the target flow rate, each inner diameter within the inner diameter range of the flow testing tool, the density and dynamic viscosity of the downhole supercritical carbon dioxide; determine whether there is at least one second Reynolds number within the standard Reynolds number range, and if so, use the inner diameter corresponding to the second Reynolds number as the second design value of the inner diameter of the flow testing tool; determine the standard inner diameter of the flow testing tool according to the first design value and the second design value, and the flow testing tool with the standard inner diameter is used to test the flow of downhole supercritical carbon dioxide. Or, the evaluation method of the flow testing tool is applied to a flow testing tool evaluation system, and the flow testing tool evaluation system at least includes an oil-water storage module and a flow testing tool test module; wherein the oil-water storage module includes in sequence: an oil tank and a water tank, a first comparison mass flowmeter and a first injection pump, the first comparison mass flowmeter is used to test the initial flow of oil and water after the valves corresponding to the oil tank and the water tank are opened, and the first injection pump is used to pump oil and water into the flow testing tool test module; the flow testing tool test module includes in sequence: a mixing tank, a mixing pump, the above-mentioned standard inner diameter flow testing tool and a second comparison mass flowmeter, the mixing tank is used to compare the pumped oil and The method comprises the following steps: mixing the initial flow rate and the outlet flow rate to obtain a mixed test liquid; the mixing pump is used to pump the mixed test liquid into the flow test tool with a standard inner diameter; the flow test tool with a standard inner diameter is used to test the flow of the mixed test liquid; and the second comparison mass flowmeter is used to test the outlet flow of the mixed test liquid after the flow test tool with a standard inner diameter is tested. The method comprises the following steps: obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate and the outlet flow rate; when the comparison is passed, comparing the outlet flow rate and the test result of the flow test tool with a standard inner diameter; when the comparison is passed again, determining that the flow test tool with a standard inner diameter can be used to test the flow of supercritical carbon dioxide downhole.

[0187] In order to complete the above instructions more accurately, refer to Figure 8As shown, the embodiment of this specification also provides another specific electronic device, wherein the electronic device includes a network communication port 801, a processor 802 and a memory 803, and the above structures are connected through internal cables so that each structure can perform specific data interaction.

[0188] The network communication port 801 may be used to calculate the first Reynolds number corresponding to different flow rates or obtain the initial flow rate and the outlet flow rate based on the test value of the inner diameter of the flow test tool, different flow rates, and the density and dynamic viscosity of the downhole supercritical carbon dioxide, and compare the initial flow rate with the outlet flow rate.

[0189] The processor 802 may be specifically configured to determine whether the first Reynolds number is within a standard Reynolds number range, and if so, use the test value as a first design value for the inner diameter of the flow test tool; determine an inner diameter range of the flow test tool based on the outer diameter and inner diameter of the downhole tool, wherein the flow test tool is designed in the downhole tool; fix a target flow rate among different flow rates, and calculate a second Reynolds number corresponding to each inner diameter based on the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of downhole supercritical carbon dioxide; determine whether at least one second Reynolds number is within the standard Reynolds number range, and if so, use the inner diameter corresponding to the second Reynolds number as a second design value for the inner diameter of the flow test tool; determine a standard inner diameter of the flow test tool based on the first design value and the second design value, and use the flow test tool with the standard inner diameter for testing the flow of downhole supercritical carbon dioxide; or, if the comparison passes, compare the outlet flow rate with the test result of the flow test tool with the standard inner diameter; and if the comparison passes again, determine that the flow test tool with the standard inner diameter can be used for testing the flow of downhole supercritical carbon dioxide;

[0190] The memory 803 may be specifically used to store corresponding instruction programs.

[0191] In this embodiment, the network communication port 801 can be a virtual port that is bound to different communication protocols, thereby being capable of sending or receiving different data. For example, the network communication port can be a port responsible for web data communication, a port responsible for FTP data communication, or a port responsible for email data communication. Furthermore, the network communication port can also be a physical communication interface or communication chip. For example, it can be a wireless mobile network communication chip, such as GSM or CDMA; it can also be a Wi-Fi chip; or it can be a Bluetooth chip.

[0192] In this embodiment, the processor 802 may be implemented in any suitable manner. For example, the processor may take the form of a microprocessor or a processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, an embedded microcontroller, etc. This specification is not intended to limit this.

[0193] In this embodiment, the memory 803 may include multiple levels. In a digital system, anything that can store binary data can be a memory. In an integrated circuit, a circuit with a storage function that has no physical form is also called a memory, such as RAM, FIFO, etc. In a system, a storage device with a physical form is also called a memory, such as a memory stick, TF card, etc.

[0194] The embodiment of this specification also provides a computer storage medium based on the design method of the downhole supercritical carbon dioxide flow test tool or the evaluation method of the downhole supercritical carbon dioxide flow test tool, wherein the computer storage medium stores a computer program / instruction, which, when executed, realizes: calculating the first Reynolds number corresponding to different flow rates according to the test value of the inner diameter of the flow test tool, different flow rates, density and dynamic viscosity of downhole supercritical carbon dioxide; judging whether the first Reynolds number is within the Reynolds number standard range, and if so, using the test value as the first design value of the inner diameter of the flow test tool; determining the first Reynolds number according to the outer diameter and inner diameter of the downhole tool. The method comprises the following steps: fixing the inner diameter range of a flow testing tool, wherein the flow testing tool is designed in a downhole tool; fixing a target flow rate among different flow rates, and calculating a second Reynolds number corresponding to each inner diameter according to the target flow rate, each inner diameter within the inner diameter range of the flow testing tool, and the density and dynamic viscosity of downhole supercritical carbon dioxide; judging whether there is at least one second Reynolds number within the standard range of Reynolds numbers, and if so, taking the inner diameter corresponding to the second Reynolds number as the second design value of the inner diameter of the flow testing tool; determining the standard inner diameter of the flow testing tool according to the first design value and the second design value, and the flow testing tool with the standard inner diameter is used to test the flow of downhole supercritical carbon dioxide. Or, the flow test tool evaluation method is applied to a flow test tool evaluation system, and the flow test tool evaluation system at least includes an oil-water storage module and a flow test tool test module; wherein the oil-water storage module includes in sequence: an oil tank and a water tank, a first comparison mass flowmeter and a first injection pump, the first comparison mass flowmeter is used to test the initial flow of oil and water after the valves corresponding to the oil tank and the water tank are opened, and the first injection pump is used to pump oil and water into the flow test tool test module; the flow test tool test module includes in sequence: a mixing tank, a mixing pump, the above-mentioned standard inner diameter flow test tool and a second comparison mass flowmeter, the mixing tank is used to compare the pumped oil and The method comprises the following steps: mixing the initial flow rate and the outlet flow rate to obtain a mixed test liquid; the mixing pump is used to pump the mixed test liquid into the flow test tool with a standard inner diameter; the flow test tool with a standard inner diameter is used to test the flow of the mixed test liquid; and the second comparison mass flowmeter is used to test the outlet flow of the mixed test liquid after the flow test tool with a standard inner diameter is tested. The method comprises the following steps: obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate and the outlet flow rate; when the comparison is passed, comparing the outlet flow rate and the test result of the flow test tool with a standard inner diameter; when the comparison is passed again, determining that the flow test tool with a standard inner diameter can be used to test the flow of supercritical carbon dioxide downhole.

[0195] In this embodiment, the storage medium includes, but is not limited to, random access memory (RAM), read-only memory (ROM), cache, hard disk drive (HDD), or memory card. The memory can be used to store computer program instructions. The network communication unit can be an interface configured in accordance with the standards specified by the communication protocol for network connection communication.

[0196] In this embodiment, the functions and effects specifically implemented by the program instructions stored in the computer storage medium can be explained in comparison with other implementations and will not be repeated here.

[0197] Although this specification provides the method operation steps as described in the embodiments or flow charts, more or fewer operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the device or client product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment). The term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, product or device. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or device including the elements. Words such as first and second are used to represent names and do not represent any particular order.

[0198] Those skilled in the art will also appreciate that, in addition to implementing the controller in pure computer-readable program code, it is entirely possible to implement the same functionality by logically programming the method steps in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, embedded microcontrollers, and the like. Therefore, such a controller can be considered a hardware component, and the devices included therein for implementing various functions can also be considered structures within the hardware component. Alternatively, the devices for implementing various functions can be considered both software modules implementing the method and structures within the hardware component.

[0199] This specification may be described in the general context of computer-executable instructions, such as program modules, executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, and the like that perform specific tasks or implement specific abstract data types. This specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media, including storage devices.

[0200] Through the description of the above embodiments, it can be seen that those skilled in the art can clearly understand that this specification can be implemented by means of software plus the necessary general hardware platform. Based on this understanding, the technical solution of this specification can essentially be embodied in the form of a software product. This computer software product can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a mobile terminal, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of this specification.

[0201] The various embodiments in this specification are described in a progressive manner. References to the common or similar parts of the various embodiments are sufficient. Each embodiment focuses on the differences from the other embodiments. This specification can be used in a variety of general-purpose or specialized computer system environments or configurations. For example, personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, and distributed computing environments that include any of the above systems or devices.

[0202] Although the present specification has been described with reference to the embodiments, persons skilled in the art will appreciate that there are many variations to the present specification without departing from the spirit of the present specification, and it is intended that the appended claims encompass such variations without departing from the spirit of the present specification.

Claims

1. A design method for a downhole supercritical carbon dioxide flow testing tool, characterized in that: include: Calculate the first Reynolds number corresponding to different flow rates based on the test value of the inner diameter of the flow test tool, different flow rates, and the density and dynamic viscosity of the downhole supercritical carbon dioxide; determining whether the first Reynolds number is within a Reynolds number standard range, and if so, using the test value as a first design value of the inner diameter of the flow test tool; Determining an inner diameter range of a flow rate testing tool based on an outer diameter and an inner diameter of the downhole tool, wherein the flow rate testing tool is designed into the downhole tool; Fixing a target flow rate among different flow rates, and calculating a second Reynolds number corresponding to each inner diameter based on the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide; Determining whether there is at least one second Reynolds number within the Reynolds number standard range, and if so, using the inner diameter corresponding to the second Reynolds number as a second design value of the inner diameter of the flow test tool; Determining a standard inner diameter of a flow testing tool according to the first design value and the second design value, wherein the flow testing tool with the standard inner diameter is used to test the flow rate of supercritical carbon dioxide downhole; Wherein, determining the inner diameter range of the flow testing tool according to the outer diameter and inner diameter of the downhole tool includes: Determine the outer wall thickness of the downhole tool according to the outer diameter of the downhole tool, and determine the inner wall thickness of the downhole tool according to the inner diameter of the downhole tool; Determine the space allowance for the flow test tool in the downhole tool based on the outer diameter, inner diameter, outer wall thickness, and inner wall thickness of the downhole tool; Determine the upper limit of the inner diameter of the flow test tool according to the space margin and the inner wall thickness, and determine the inner diameter range of the flow test tool in combination with the preset step length; Determining the standard inner diameter of the flow testing tool according to the first design value and the second design value includes: The Reynolds numbers corresponding to the first design value and the second design value are compared, and a design value having a Reynolds number greater than a preset threshold is selected from the first design value and the second design value as the standard inner diameter of the flow test tool.

2. The method according to claim 1, characterized in that Calculating the first Reynolds number corresponding to different flow rates based on the test value of the inner diameter of the flow test tool, different flow rates, and the density and dynamic viscosity of the downhole supercritical carbon dioxide includes: Calculating first flow velocities corresponding to different flow rates according to a test value of the inner diameter of the flow testing tool and the different flow rates; The first Reynolds numbers corresponding to different flow rates are calculated according to the first flow rate, the density and the dynamic viscosity of the downhole supercritical carbon dioxide.

3. The method according to claim 1, characterized in that The method of fixing a target flow rate among different flow rates and calculating a second Reynolds number corresponding to each inner diameter according to the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide comprises: Fixing the target flow rate among different flow rates, and calculating the second flow rate corresponding to each inner diameter according to the target flow rate and each inner diameter within the inner diameter range of the flow test tool; The second Reynolds number corresponding to each inner diameter is calculated according to the second flow rate, the density and the dynamic viscosity of the downhole supercritical carbon dioxide.

4. A method for evaluating a downhole supercritical carbon dioxide flow testing tool, characterized in that: Applied in a flow test tool evaluation system, the flow test tool evaluation system comprises at least an oil-water storage module and a flow test tool testing module; The oil-water storage module includes, in sequence: an oil tank and a water tank, a first comparative mass flowmeter and a first injection pump, wherein the first comparative mass flowmeter is used to test the initial flow of oil and water after the valves corresponding to the oil tank and the water tank are opened, and the first injection pump is used to pump oil and water into the flow test tool test module; The flow test tool test module sequentially comprises: a mixing tank, a mixing pump, a flow test tool of standard inner diameter designed according to the design method of the downhole supercritical carbon dioxide flow test tool according to any one of claims 1 to 3, and a second comparative mass flow meter, wherein the mixing tank is used to mix the pumped oil and water to obtain a mixed test liquid, the mixing pump is used to pump the mixed test liquid into the flow test tool of standard inner diameter, the flow test tool of standard inner diameter is used to test the flow of the mixed test liquid, and the second comparative mass flow meter is used to test the outlet flow of the mixed test liquid after the flow test tool of standard inner diameter is tested; the method comprises: Obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate and the outlet flow rate; When the comparison is passed, comparing the outlet flow rate with the test result of the flow test tool of the standard inner diameter; When the comparison is repeated, it is determined that the flow rate testing tool with the standard inner diameter can be used to test the flow rate of supercritical carbon dioxide downhole.

5. A design device for a downhole supercritical carbon dioxide flow testing tool, characterized in that: include: A first calculation module is used to calculate a first Reynolds number corresponding to different flow rates based on a test value of an inner diameter of a flow test tool, different flow rates, and the density and dynamic viscosity of downhole supercritical carbon dioxide; a first judging module, configured to judge whether the first Reynolds number is within a Reynolds number standard range, and if so, use the test value as a first design value of the inner diameter of the flow testing tool; A first determining module is configured to determine an inner diameter range of a flow rate testing tool according to an outer diameter and an inner diameter of the downhole tool, wherein the flow rate testing tool is designed in the downhole tool; A second calculation module is configured to fix a target flow rate among different flow rates and calculate a second Reynolds number corresponding to each inner diameter based on the target flow rate, each inner diameter within the inner diameter range of the flow test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide; a second determining module, configured to determine whether at least one second Reynolds number is within a standard Reynolds number range, and if so, using an inner diameter corresponding to the second Reynolds number as a second design value of the inner diameter of the flow testing tool; A second determining module is configured to determine a standard inner diameter of a flow testing tool according to the first design value and the second design value, wherein the flow testing tool with the standard inner diameter is used to test the flow rate of supercritical carbon dioxide downhole; Wherein, determining the inner diameter range of the flow testing tool according to the outer diameter and inner diameter of the downhole tool includes: Determine the outer wall thickness of the downhole tool according to the outer diameter of the downhole tool, and determine the inner wall thickness of the downhole tool according to the inner diameter of the downhole tool; Determine the space allowance for the flow test tool in the downhole tool based on the outer diameter, inner diameter, outer wall thickness, and inner wall thickness of the downhole tool; Determine the upper limit of the inner diameter of the flow test tool according to the space margin and the inner wall thickness, and determine the inner diameter range of the flow test tool in combination with the preset step length; Determining the standard inner diameter of the flow testing tool according to the first design value and the second design value includes: The Reynolds numbers corresponding to the first design value and the second design value are compared, and a design value having a Reynolds number greater than a preset threshold is selected from the first design value and the second design value as the standard inner diameter of the flow test tool.

6. An evaluation device for a downhole supercritical carbon dioxide flow testing tool, characterized in that: include: Applied in a flow test tool evaluation system, the flow test tool evaluation system comprises at least an oil-water storage module and a flow test tool testing module; The oil-water storage module includes, in sequence: an oil tank and a water tank, a first comparative mass flowmeter and a first injection pump, wherein the first comparative mass flowmeter is used to test the initial flow of oil and water after the valves corresponding to the oil tank and the water tank are opened, and the first injection pump is used to pump oil and water into the flow test tool test module; The flow test tool test module sequentially comprises: a mixing tank, a mixing pump, a flow test tool of standard inner diameter designed according to the design method of the downhole supercritical carbon dioxide flow test tool according to any one of claims 1 to 3, and a second comparative mass flow meter, wherein the mixing tank is used to mix the pumped oil and water to obtain a mixed test liquid, the mixing pump is used to pump the mixed test liquid into the flow test tool of standard inner diameter, the flow test tool of standard inner diameter is used to test the flow of the mixed test liquid, and the second comparative mass flow meter is used to test the outlet flow of the mixed test liquid after the flow test tool of standard inner diameter is tested; the device comprises: a first comparison module, configured to obtain the initial flow rate and the outlet flow rate, and compare the initial flow rate with the outlet flow rate; A second comparison module is used to compare the outlet flow rate with the test result of the flow test tool of the standard inner diameter when the comparison is passed; The verification module is used to determine that the flow test tool with the standard inner diameter can be used to test the flow of supercritical carbon dioxide in the well when the comparison is passed again.

7. A computer device comprising a memory, a processor, and a computer program / instruction stored in the memory, characterized in that: The processor executes the computer program / instructions to implement the steps of the design method of the downhole supercritical carbon dioxide flow test tool according to any one of claims 1 to 3 and the evaluation method of the downhole supercritical carbon dioxide flow test tool according to claim 4.

8. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the design method of the downhole supercritical carbon dioxide flow test tool according to any one of claims 1 to 3 and the evaluation method of the downhole supercritical carbon dioxide flow test tool according to claim 4 are implemented.

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