Design and evaluation method of downhole supercritical carbon dioxide flow testing tool

Abstract

The invention discloses a design and evaluation method of an underground supercritical carbon dioxide flow test tool, and the design method comprises the steps: calculating a first Reynolds number according to the test value of the inner diameter of the flow test tool, different flows, densities and dynamic viscosities; judging whether the first Reynolds number is in a Reynolds number standard range or not, and if yes, taking the test value as a first design value; according to the outer diameter and the inner drift diameter of the downhole tool, the inner diameter range of the flow testing tool is determined; the target flow in the different flows is fixed, and a second Reynolds number is calculated according to the target flow, the inner diameters in the inner diameter range, the density and the dynamic viscosity; whether at least one second Reynolds number exists in the Reynolds number standard range or not is judged, and if yes, the inner diameter corresponding to the second Reynolds number serves as a second design value; according to the first design value and the second design value, the standard inner diameter is determined, the flow testing tool with the standard inner diameter is used for testing the flow of the underground supercritical carbon dioxide, and therefore the underground oil displacement rate and the recovery rate can be effectively increased.

Description

Technical Field

[0001] The 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] Carbon dioxide flooding technology is a technology that injects carbon dioxide into oil layers to increase oil field recovery. The use of layered carbon dioxide injection can effectively avoid the problem of carbon dioxide gas channeling causing the oil layer to be unable to be effectively utilized.

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

[0004] To address the above problems, no effective solution has been proposed yet. 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 the existing surface flow testing technology cannot effectively improve the downhole oil displacement rate and recovery rate.

[0006] In a first aspect, an embodiment of the present 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 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;

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

[0009] Determining the inner diameter range of the flow test tool according to the outer diameter and inner diameter of the downhole tool, wherein the flow test tool is designed in the downhole tool;

[0010] 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;

[0011] Determine whether there is at least one second Reynolds number within the Reynolds number standard 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;

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

[0013] In some embodiments, the first Reynolds number corresponding to different flow rates is calculated 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, including:

[0014] 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;

[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 according to the outer diameter and the 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 margin of the flow test tool in the downhole tool according to 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 test tool is determined according to the space margin and the inner wall thickness, and the inner diameter range of the flow test 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 turn, 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, and the second Reynolds number corresponding to each inner diameter is calculated, including:

[0021] 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;

[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 whose Reynolds number is 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, the embodiments of this specification also provide a method for evaluating a downhole supercritical carbon dioxide flow test tool, the method being applied to a flow test tool evaluation system, the flow test tool evaluation system comprising at least an oil-water storage module and a flow test tool test module;

[0026] The oil-water storage module includes, in sequence: an oil tank and a water tank, a first comparative mass flow meter and a first injection pump, wherein the first comparative mass flow meter 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 comprises in sequence: a mixing tank, a mixing pump, the above-mentioned flow test tool of standard inner diameter and a second comparative mass flow meter, 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:

[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 test 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 also provide a design device for a downhole supercritical carbon dioxide flow test tool, the device comprising:

[0032] A first calculation module is used to calculate 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 the downhole supercritical carbon dioxide;

[0033] A first judgment module, used for judging whether the first Reynolds number is within a Reynolds number standard range, and if so, taking the test value as a first design value of the inner diameter of the flow test tool;

[0034] A first determination module is used to determine the inner diameter range of a flow test tool according to the outer diameter and inner diameter of the downhole tool, wherein the flow test tool is designed in the downhole tool;

[0035] A second calculation module is used to fix a target flow rate among different flow rates, and calculate 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;

[0036] A second judgment module is used to judge whether there is at least one second Reynolds number within the Reynolds number standard range, and if so, the inner diameter corresponding to the second Reynolds number is used as a second design value of the inner diameter of the flow test tool;

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

[0038] In a fourth aspect, an embodiment of the present specification further provides an evaluation device for a downhole supercritical carbon dioxide flow test tool, the device comprising: an evaluation system for a flow test tool, the flow test tool evaluation system comprising at least an oil-water storage module and a flow test tool test module;

[0039] The oil-water storage module includes, in sequence: an oil tank and a water tank, a first comparative mass flow meter and a first injection pump, wherein the first comparative mass flow meter 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 comprises in sequence: 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 device comprises:

[0041] A first comparison module, used for obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate and the outlet flow rate;

[0042] A second comparison module, used for comparing 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 downhole when the comparison is passed again.

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

[0045] In a sixth aspect, the embodiments of the present specification also provide 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 test tool or the evaluation method of the above-mentioned downhole supercritical carbon dioxide flow test tool.

[0046] The embodiment of this specification provides a design method for a downhole supercritical carbon dioxide flow test tool. First, 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. Then, it is determined whether the first Reynolds number is within the standard range of the Reynolds number. If so, the test value is used as the first design value of the inner diameter of the flow test tool. Then, according to the outer diameter and inner diameter of the downhole tool, the inner diameter range of the flow test tool is determined, and the flow test tool is designed in the downhole tool. Then, the target flow rate in different flow rates is fixed, and the second Reynolds number corresponding to each inner diameter is calculated in turn 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. Then, it is determined whether there is at least one second Reynolds number within the standard range of the Reynolds number. If so, the inner diameter corresponding to the second Reynolds number is used as the second design value of the inner diameter of the flow test tool. Finally, according to the first design value and the second design value, the standard inner diameter of the flow test tool is determined, and the flow test tool with a standard inner diameter is used to test the flow 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] The embodiment of the present specification provides an evaluation method for a downhole supercritical carbon dioxide flow test tool, which is applied to a flow test tool evaluation system, wherein 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, wherein 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 flow test tool of standard inner diameter and a second comparison mass flowmeter, 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 comparison mass flowmeter 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: first, obtaining the initial flow and the outlet flow, and comparing the initial flow and the outlet flow. 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 supercritical carbon dioxide downhole. Through the above scheme, it can be effectively verified that the flow test tool of the standard inner diameter is not affected by the density and viscosity of the medium during measurement, and the flow test tool of the standard inner diameter belongs to 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 use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0049] Figure 1 It is a flow chart of a design method of 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 testing tool provided in an embodiment of this specification;

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

[0054] Figure 6 It 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 It 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 It is a schematic diagram of the structural composition 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] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0060] Affected by factors such as small downhole space and changes in supercritical carbon dioxide flow state, 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 recovery and recovery effects. In view of 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 downhole supercritical carbon dioxide flow testing tools. In view of the fact that carbon dioxide is in a supercritical state under high temperature and high pressure conditions in the wellbore, has special properties, and is greatly affected by temperature and pressure changes, the fluid phase state, viscosity, and density change greatly. 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 space downhole is designed, and the accuracy of the flow testing tool in testing downhole supercritical carbon dioxide flow is verified.

[0061] Based on the above ideas, this specification proposes a design method for a downhole supercritical carbon dioxide flow test tool. First, 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. Then, it is determined whether the first Reynolds number is within the standard range of the Reynolds number. If so, the test value is used as the first design value of the inner diameter of the flow test tool. Then, according to the outer diameter and inner diameter of the downhole tool, the inner diameter range of the flow test tool is determined, and the flow test tool is designed in the downhole tool. Then, the target flow rate in different flow rates is fixed, and the second Reynolds number corresponding to each inner diameter is calculated in turn 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. Then, it is determined whether there is at least one second Reynolds number within the standard range of the Reynolds number. If so, the inner diameter corresponding to the second Reynolds number is used as the second design value of the inner diameter of the flow test tool. Finally, according to the first design value and the second design value, the standard inner diameter of the flow test tool is determined, and the flow test tool with a standard inner diameter is used to test the flow of downhole supercritical carbon dioxide.

[0062] The present specification also proposes an evaluation method for a downhole supercritical carbon dioxide flow test tool, which is applied to a flow test tool evaluation system, wherein 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, wherein 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 flow test tool of standard inner diameter and a second comparison mass flowmeter, 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 comparison mass flowmeter 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: first, obtaining the initial flow and the outlet flow, and comparing the initial flow and the outlet flow. 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 the underground supercritical carbon dioxide.

[0063] It should be noted that the terms "first", "second", etc. 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 sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0064] See also Figure 1 As shown, the embodiment of this specification provides a design method for a downhole supercritical carbon dioxide flow test tool. When implemented specifically, the method may include the following contents.

[0065] S101: Calculate 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 the 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, that is, the test value of the inner diameter of the pipeline, can be set according to actual needs, such as 15mm. The different flow rates can be set according to 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 underground supercritical carbon dioxide can be the density and dynamic viscosity of the supercritical carbon dioxide obtained at the average temperature and average pressure underground, such as: when the pressure is 45MPa and the temperature is 60°C, the density of the obtained supercritical carbon dioxide is 913.29Kg / m3, and the dynamic viscosity of the obtained supercritical carbon dioxide is 9.48×10 -5 Pa.s. Reynolds number (Re) is a dimensionless number in fluid mechanics, used to describe the state of fluid motion. The test values ​​of the inner diameter of the flow test tool, different flow rates, density and dynamic viscosity of downhole supercritical carbon dioxide can be obtained in advance, and then the first Reynolds number corresponding to different flow rates can be calculated based on these data, thereby providing a data basis for the subsequent determination of the standard inner diameter of the flow test tool.

[0067] In some embodiments, the calculation of 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 in S101 may include:

[0068] S11: calculating first flow velocities corresponding to different flow rates according to the 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 according to the first flow rate, density and dynamic viscosity of downhole supercritical carbon dioxide.

[0070] In some embodiments, the specific process of calculating the first flow rate corresponding to different flow rates in the above 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 (pipeline inner diameter) is 15mm, then according to the circular area formula: s = πr 2 The cross-sectional area of ​​the pipeline 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 S12 is as follows:

[0083] The density and dynamic viscosity of supercritical carbon dioxide can be obtained at a pressure of 45 MPa and a temperature of 60°C, which are: 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 the Reynolds number standard range, and if so, use the test value as the first design value of the inner diameter of the flow test 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 standard range of Reynolds numbers.

[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 To determine the possible range, when 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 can represent the normal working range of the flow test tool. Within this range, the Strouhal number is basically unchanged, and the Reynolds number is linearly related to the flow rate, and has nothing to do with the properties such as fluid viscosity. The first Reynolds number corresponding to different flow rates and the second Reynolds number corresponding to each inner diameter of the flow test tool in actual application can be calculated, and the first Reynolds number, the second Reynolds number and the standard range of the Reynolds number are compared and analyzed to determine the optimal inner diameter of the flow test tool, that is, to determine the standard inner diameter of the flow test tool. How to determine the standard inner diameter will be explained later, and this manual does not specifically limit this.

[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 the flow test tool, and the test value of the inner diameter of the flow test tool, 15mm, can be used as the first design value of the inner diameter of the flow test tool. The first design value can be understood as a theoretical value, and the standard inner diameter of the flow test tool can be determined in combination with the second design value in actual application (or actual working conditions). This can improve the accuracy 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 the inner diameter range of the flow testing tool according to the outer diameter and inner diameter of the downhole tool, wherein the flow testing tool is designed in the downhole tool.

[0101] In some embodiments, the downhole tool may be a pressure vessel, and the flow test tool may be designed in 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 the values ​​are determined according to actual working conditions.

[0102] In some embodiments, the above S103, according to the outer diameter and the inner diameter of the downhole tool, determines the inner diameter range of the flow test tool, when implemented specifically, 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 of the flow test tool in the downhole tool according to 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 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 a preset step length.

[0106] In some embodiments, the calculation process of the outer wall thickness of the downhole tool 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), take p=50; s is wall thickness (mm); r is yield strength (MPa), take 552 (the yield strength of material 13Cr is 552); D is diameter (mm).

[0110] The design results in:

[0111]

[0112] s 内 =s 内1 +0.7=2.5mm

[0113] It should be noted that s 外 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 test tool in the downhole tool in S22 is as follows:

[0115] Combined with the above 外 5.2mm, s 内 The inner diameter of the downhole tool is 2.5 mm, the outer diameter is 114 mm, and the inner diameter is 40 mm. 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 114mm, an outer diameter of 103.6mm, an inner diameter of 45mm, an inner diameter of 40mm, and a space margin of 29.3mm. 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 the above 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 sockets are required and a processing size of 1.8mm must be reserved. Therefore, the maximum outer diameter of the flow testing tool can be: 29.3mm-1.8mm=27.5mm. The maximum outer diameter can be a target outer diameter 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 limitations on this.

[0118] After that, the upper limit of the inner diameter of the flow test tool can be determined according to the maximum outer diameter (target outer diameter) of the flow test tool of 27.5 mm and the inner wall thickness of the downhole tool of 2.5 mm. That is, the upper limit of the inner diameter of the flow test tool = 27.5 mm - 2 × 2.5 mm = 22.5 mm. Since the inner diameter size of the flow test tool is generally an integer, the upper limit of the inner diameter of the flow test tool is d ≤ 22 mm.

[0119] After that, the preset step length can be set in advance (for example, it can be set to 5 test steps, test from the large size downwards, stop if the requirements are met after the test, and continue testing if they are not met). 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. The second Reynolds number corresponding to the inner diameters of 22mm, 21mm, 20mm, 19mm, 18mm, and 17mm can be calculated later, and the inner diameter design value that meets the actual working conditions can be determined.

[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. Since the small flow test has high requirements and is difficult, 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 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, and the second Reynolds number corresponding to each inner diameter is calculated. In specific implementation, it may include:

[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: 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.

[0125] In some embodiments, the specific process of calculating the second flow rate corresponding to each inner diameter in the above 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 diameters using the circular area formula. Then, the calculated corresponding cross-sectional area and target flow rate are substituted into the flow rate calculation formula (1) to calculate the second flow rate corresponding to each inner diameter as follows:

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

[0128] When d = 21mm, 5m 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 corresponding to each inner diameter, the density and dynamic viscosity of supercritical carbon dioxide 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 = 22 mm, the corresponding second Reynolds number is:

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

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

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

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

[0140] When d = 17 mm, 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, 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 test 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. That is, 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 the actual working conditions, which is more in line with the working condition requirements 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 of supercritical carbon dioxide underground.

[0147] In some embodiments, determining the standard inner diameter of the flow test 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 whose Reynolds number is 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. The design value with a Reynolds number greater than the preset threshold can be selected, that is, the design value with a larger Reynolds number corresponding to the first design value and the second design value can be selected as the standard inner diameter of the flow test tool, such as selecting the first design value 15 mm 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, and 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 flow test tool with a standard inner diameter can be designed, which can be used to test the flow of supercritical carbon dioxide underground. The flow test tool with a standard inner diameter is a tool that meets the requirements of miniaturized design and variable density fluid flow test, and meets the technical requirements of supercritical carbon dioxide underground small space flow test.

[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 at least include 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, and 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, wherein the mixing tank 5 may be used to mix the pumped oil and water to obtain a mixed test liquid, the mixing pump 6 may 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 may be used to test the flow of the mixed test liquid, and the second comparative mass flow meter 9 may 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 also include an oil-water separation module, which may include: an oil-water separator 10, an oil storage tank 11, a water storage tank 12, and a second injection pump 13 in sequence. The oil-water separator 10 can be used to separate the oil and water in the mixed test liquid of the flow test tool test module. The separated oil can be stored in the oil storage tank 11, and the separated water can 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 can 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 also 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 with the outlet flow rate;

[0157] S502: When the comparison is passed, 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 test 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 as a variable density two-phase fluid mixed test fluid to simulate the density change 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 changing different densities, the density and viscosity changes of supercritical carbon dioxide underground can be simulated. Based on this, it is verified that the flow test tool is not affected by the density and viscosity of the medium during measurement, and the flow test tool is a non-contact measurement, thereby 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 830kg / m 3 When performing flow test tool verification or evaluation based on the flow test tool evaluation system, the steps are as follows:

[0162] Step 1: Prepare the corresponding mixed test liquid. Open the valves corresponding to the oil tank 1 and the water tank 2, start the first comparative mass flow meter 3 and the injection pump 4, and input the white oil and water into the mixing tank 5 through the injection pump 4 to mix and 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 to allow the bottom water to flow into the water storage tank 12, the upper white oil is collected into the oil storage tank 11, and the separated liquid is pumped into the oil tank 1 and the water tank 2 through the second injection pump 13 for subsequent testing.

[0165] Based on the "Karman vortex" principle, the present invention analyzes the correlation between the Strouhal number Sr and the Reynolds number Re, determines the standard range of the Reynolds number Re corresponding to the Strouhal number Sr constant, and then designs a flow test tool. At the same time, based on the equivalent density, a two-phase fluid indoor evaluation method is designed to verify the accuracy of the downhole supercritical carbon dioxide flow test.

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

[0167] The design and development has formed a flow test tool that meets the requirements of miniaturization and variable density fluids, and has passed indoor evaluation and verification to meet the test requirements, providing an effective means for downhole flow testing of carbon dioxide drive, improving the refined testing and control capabilities of gas drive fluids in complex environments, and laying the foundation for further improving the recovery effect of CCUS. The breakthrough and application of this technology will effectively improve the technical level of CCUS wellbore technology.

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

[0169] The above is an explanation of the present invention, however, it is worth noting that the specific embodiment is only for the purpose of better illustrating the present application and describing a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that 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 or continuous order shown 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 embodiments or the attached Figure 6The method operation steps or device structure shown in the figure, but based on routine or no creative labor, the method or device may include more or fewer operation steps or module units after partial combination. 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 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 distributed processing, 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 according to the test value of the inner diameter of the flow test tool, different flow rates, density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0172] The first judgment module 602 may be used to judge whether the first Reynolds number is within the Reynolds number standard range, and if so, use the test value as the first design value of the inner diameter of the flow test tool;

[0173] The first determination module 603 may be used to determine the inner diameter range of the flow test tool according to the outer diameter and the inner diameter of the downhole tool, wherein the flow test tool is designed in the downhole tool;

[0174] The second calculation module 604 can be used to 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 test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0175] The second judgment module 605 can be used to judge whether there is at least one second Reynolds number within the Reynolds number standard range, and if so, the inner diameter corresponding to the second Reynolds number is used as the second design value of the inner diameter of the flow test tool;

[0176] The second determination module 606 can be used to determine the standard inner diameter of the flow test tool according to the first design value and the second design value. The flow test tool with the 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 supercritical carbon dioxide downhole.

[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 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 margin of the flow testing tool in the downhole tool according to 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 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 size.

[0179] In some embodiments, the 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; 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 test tool.

[0181] It can be seen from the above that 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 for a downhole supercritical carbon dioxide flow test tool, the present specification also provides 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 with 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 test tool with the standard inner diameter can be used to test the flow of supercritical carbon dioxide downhole when the comparison is passed again.

[0186] The embodiments of the present specification also provide an electronic device 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, including a processor and a memory for storing executable programs / instructions of the processor. The processor can perform the following steps according to the program / instructions when implemented: calculate 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 the downhole supercritical carbon dioxide; determine whether the first Reynolds number is within the Reynolds number standard range, and if so, use the test value as the first design value of the inner diameter of the flow test tool; and determine the first Reynolds number 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 range of Reynolds number, 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 test tool 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, wherein 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, wherein the mixing tank is used to pump the oil and water into the flow test tool test module. The mixed test liquid is mixed with water to obtain a mixed test liquid, the mixed delivery 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 the standard inner diameter is tested; the method comprises: obtaining the initial flow and the outlet flow, and comparing the initial flow and the outlet flow; when the comparison is passed, comparing the outlet flow and the test result of the flow test tool with the standard inner diameter; when the comparison is passed again, determining that the flow test tool with the 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 can be used to calculate the first Reynolds number corresponding to different flow rates or obtain the initial flow rate and the outlet flow rate, and compare the initial flow rate and the outlet flow rate according to the test value of the inner diameter of the flow test tool, different flow rates, density and dynamic viscosity of the downhole supercritical carbon dioxide;

[0189] The processor 802 can be specifically used to determine whether the first Reynolds number is within the standard range of Reynolds numbers, and if so, use the test value as the first design value of the inner diameter of the flow test tool; determine the inner diameter range of the flow test tool according to the outer diameter and inner diameter of the downhole tool, and the flow test tool is designed in the downhole tool; fix the target flow rate in 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 test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide; determine whether there is at least one second Reynolds number within the standard range of Reynolds numbers, 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 test tool; determine the standard inner diameter of the flow test tool according to the first design value and the second design value, and the flow test tool with the standard inner diameter is used to test the flow of downhole supercritical carbon dioxide; or, when the comparison is passed, compare the outlet flow and the test results of the flow test tool with the standard inner diameter; when the comparison is passed again, determine that the flow test tool with the standard inner diameter can be used to test 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 so that different data can be sent or received. 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. In addition, 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, CDMA, etc.; it can also be a Wifi chip; it can also be a Bluetooth chip.

[0192] In this embodiment, the processor 802 may be implemented in any appropriate manner. For example, the processor may take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (such as software or firmware) executable by the (micro)processor, a logic gate, a switch, an application specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller, etc. This specification does not 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 but 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 embodiments of the present specification also provide 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, and when the computer program / instruction is executed, the following are achieved: 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 the 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 inner diameter of the downhole tool 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 test tool, wherein the flow test 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 test 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 test tool; determining a standard inner diameter of the flow test tool according to the first design value and the second design value, and the flow test tool with the standard inner diameter is used to test the flow rate 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, wherein 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, wherein the mixing tank is used to pump the oil and water into the flow test tool test module. The mixed test liquid is mixed with water to obtain a mixed test liquid, the mixed delivery 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 the standard inner diameter is tested; the method comprises: obtaining the initial flow and the outlet flow, and comparing the initial flow and the outlet flow; when the comparison is passed, comparing the outlet flow and the test result of the flow test tool with the standard inner diameter; when the comparison is passed again, determining that the flow test tool with the 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, a random access memory (RAM), a read-only memory (ROM), a cache, a hard disk (HDD), or a memory card. The memory may be used to store computer program instructions. The network communication unit may be an interface for network connection communication set in accordance with the standard specified by the communication protocol.

[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 described in detail here.

[0197] Although the present specification provides method operation steps as described in the embodiments or flow charts, more or less 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 a unique 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 "include", "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 a 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. The first, second, etc. words are used to represent the name, and do not represent any particular order.

[0198] Those skilled in the art also know that, in addition to implementing the controller in a purely computer-readable program code, the controller can be made to implement the same function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the devices for implementing various functions included therein can also be considered as structures within the hardware component. Or even, the devices for implementing various functions can be considered as both software modules for implementing the method and structures within the hardware component.

[0199] This specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. 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 communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media including storage devices.

[0200] Through the description of the above embodiments, it can be known that those skilled in the art can clearly understand that the present specification can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present specification can essentially be embodied in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a 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 each embodiment of the present specification or some parts of the embodiments.

[0201] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. This specification can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld devices or portable devices, tablet devices, multi-processor systems, microprocessor-based systems, set-top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc.

[0202] Although the present specification is described through embodiments, persons skilled in the art will appreciate that there are many variations of the present specification without departing from the spirit of the present specification, and it is intended that the appended claims include these variations without departing from the spirit of the present specification.

Claims

1. A design method for a downhole supercritical carbon dioxide flow test tool, characterized in that: include: Calculate 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; Determine whether the first Reynolds number is within the Reynolds number standard range, and if so, use the test value as a first design value of the inner diameter of the flow test tool; Determining the inner diameter range of the flow test tool according to the outer diameter and inner diameter of the downhole tool, wherein the flow test tool is designed in the 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 test tool, and the density and dynamic viscosity of the downhole supercritical carbon dioxide; Determine whether there is at least one second Reynolds number within the Reynolds number standard 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; The standard inner diameter of the flow test tool is determined according to the first design value and the second design value. The flow test tool with the standard inner diameter is used to test the flow of supercritical carbon dioxide underground.

2. The method according to claim 1, characterized in that: The method of 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 includes: Calculating first flow velocities corresponding to different flow rates according to the test value of the inner diameter of the flow test 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 Determining the inner diameter range of the flow test 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 margin of the flow test tool in the downhole tool according to the outer diameter, inner diameter, outer wall thickness and inner wall thickness of the downhole tool; The upper limit of the inner diameter of the flow test tool is determined according to the space margin and the inner wall thickness, and the inner diameter range of the flow test tool is determined in combination with the preset step length.

4. The method according to claim 1, characterized in that: The target flow rate among the fixed different flow rates is calculated, in turn, 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, and the second Reynolds number corresponding to each inner diameter is calculated, including: 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; 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.

5. The method according to claim 1, characterized in that Determining the standard inner diameter of the flow test 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 whose Reynolds number is 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. A method for evaluating a downhole supercritical carbon dioxide flow test tool, characterized in that: Applied in a flow test tool evaluation system, the flow test tool evaluation system at least comprises 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 flow meter and a first injection pump, wherein the first comparative mass flow meter 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 comprises in sequence: a mixing tank, a mixing pump, a flow test tool of standard inner diameter as described in any one of claims 1 to 5, 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 test tool with the standard inner diameter can be used to test the flow rate of supercritical carbon dioxide downhole.

7. A design device for a downhole supercritical carbon dioxide flow test tool, characterized in that: include: A first calculation module is used to calculate 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 the downhole supercritical carbon dioxide; A first judgment module, used for judging whether the first Reynolds number is within a Reynolds number standard range, and if so, taking the test value as a first design value of the inner diameter of the flow test tool; A first determination module is used to determine the inner diameter range of a flow test tool according to the outer diameter and inner diameter of the downhole tool, wherein the flow test tool is designed in the downhole tool; A second calculation module is used to fix a target flow rate among different flow rates, and calculate 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; A second judgment module is used to judge whether there is at least one second Reynolds number within the Reynolds number standard range, and if so, the inner diameter corresponding to the second Reynolds number is used as a second design value of the inner diameter of the flow test tool; The second determination module is used to determine the standard inner diameter of the flow test tool according to the first design value and the second design value. The flow test tool with the standard inner diameter is used to test the flow of supercritical carbon dioxide underground.

8. An evaluation device for a downhole supercritical carbon dioxide flow test tool, characterized in that: include: Applied in a flow test tool evaluation system, the flow test tool evaluation system at least comprises 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 flow meter and a first injection pump, wherein the first comparative mass flow meter 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 comprises in sequence: a mixing tank, a mixing pump, a flow test tool of standard inner diameter as described in any one of claims 1 to 5, 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, used for obtaining the initial flow rate and the outlet flow rate, and comparing the initial flow rate with the outlet flow rate; A second comparison module, used for comparing 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 downhole when the comparison is passed again.

9. 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 method according to any one of claims 1 to 6.

10. 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 method according to any one of claims 1 to 6 are implemented.

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