Alternate water-gas flooding injection-production ratio calculation method and device, electronic equipment and medium

Abstract

The invention discloses a water-gas alternating flooding injection-production ratio calculation method and device, electronic equipment and a medium. The method comprises the following steps: simulating a crude oil dissolved gas-oil ratio change rule and a carbon dioxide content change rule under different proportions according to an underground crude oil dissolved gas-oil ratio calculation formula and a carbon dioxide content calculation formula; simulating the high-pressure physical property change of the crude oil in the output gas circulation reinjection process to obtain a saturation pressure change rule and a crude oil volume coefficient change rule; according to a crude oil dissolved gas-oil ratio change rule, a carbon dioxide content change rule, a saturation pressure change rule and a crude oil volume coefficient change rule, a crude oil high-pressure physical property chart in the output gas circulation reinjection process is constructed; and on the basis of the crude oil high-pressure physical property chart, an injection-production ratio calculation formula in the carbon dioxide-containing output gas circulation reinjection process is constructed. According to the technical scheme, the injection-production ratio calculation model based on output gas circulation reinjection water-gas alternate flooding is established, and a technical means is provided for development effect evaluation, development adjustment, production regulation and control and the like of an oil field.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development, and in particular to a method, device, electronic equipment and medium for calculating injection-production ratio of water-gas alternating drive. Background Art

[0002] Due to the high dissolved gas-oil ratio and high content of CO2 (carbon dioxide) in deepwater thick carbonate reservoirs, the deepwater oil fields are far from the land and the produced gas cannot be transported out. Due to environmental protection policy requirements, part of the methane in the produced gas needs to be separated and injected into the oil layer alternately with water to achieve water-gas alternating miscible drive development. With the continuous development of the oil field, this produced gas reinjection causes the underground crude oil dissolved gas-oil ratio to gradually increase and the CO2 content in the dissolved gas to gradually increase, which in turn causes the physical properties of the reservoir fluid to change, and the miscible pressure and miscible characteristics of the water-gas alternating drive will also change accordingly. The injection-production ratio is an important development indicator in the water injection and gas injection production of oil fields.

[0003] At present, the calculation of injection-production ratio is mostly for oil fields developed by water injection. For oil fields developed by gas injection, the physical property changes of reservoir fluid caused by gas injection are not taken into account, and it is not suitable for the water-gas alternating flooding development process of this type of oil reservoir.

[0004] In order to evaluate the development effect of water-gas alternating flooding in this type of reservoir and grasp the injection-production balance relationship in real time, it is necessary to establish a calculation method for the injection-production ratio of water-gas alternating miscible flooding suitable for recycling high-CO2 produced gas. Summary of the invention

[0005] The present invention provides a method, device, electronic equipment and medium for calculating the injection-production ratio of water-gas alternating drive, establishes a water-gas alternating drive injection-production ratio calculation model based on the circulation and reinjection of produced gas, and provides technical means for oilfield development effect evaluation, development adjustment, production regulation, etc.

[0006] According to one aspect of the present invention, a method for calculating the injection-production ratio of water-gas alternating flooding is provided, the method comprising:

[0007] Obtaining a calculation formula for the dissolved gas-oil ratio of underground crude oil during the recycling and reinjection process of the target oil reservoir's produced gas, and obtaining a calculation formula for the carbon dioxide content during the recycling and reinjection process of the target oil reservoir's produced gas;

[0008] According to the calculation formula of underground crude oil dissolved gas-oil ratio and carbon dioxide content, simulate the change law of crude oil dissolved gas-oil ratio and carbon dioxide content at different ratios;

[0009] Simulate the changes in high-pressure physical properties of crude oil during the recycling and reinjection of produced gas, and obtain the change laws of saturation pressure and crude oil volume coefficient;

[0010] According to the variation law of the crude oil dissolved gas-oil ratio, the carbon dioxide content, the saturation pressure and the crude oil volume coefficient, a high-pressure physical property map of crude oil during the produced gas circulation and reinjection process is constructed;

[0011] Based on the crude oil high-pressure physical property atlas, a calculation formula for the injection-production ratio during the recycling and reinjection process of the produced gas containing carbon dioxide is constructed.

[0012] According to another aspect of the present invention, a device for calculating injection-production ratio of water-gas alternating flooding is provided, the device comprising:

[0013] A calculation formula acquisition module is used to obtain a calculation formula for the dissolved gas-oil ratio of underground crude oil during the circulation and reinjection process of the target oil reservoir produced gas, and to obtain a calculation formula for the carbon dioxide content during the circulation and reinjection process of the target oil reservoir produced gas;

[0014] A variation law simulation module is used to simulate the variation law of the crude oil dissolved gas-oil ratio and the carbon dioxide content under different proportions according to the calculation formula of the underground crude oil dissolved gas-oil ratio and the calculation formula of the carbon dioxide content;

[0015] The module for obtaining the change law is used to simulate the change of the high-pressure physical properties of crude oil during the production gas recycling and reinjection process, and obtain the change law of the saturation pressure and the change law of the crude oil volume coefficient;

[0016] A crude oil high-pressure physical property chart construction module is used to construct a crude oil high-pressure physical property chart during the production gas circulation reinjection process according to the variation law of the crude oil dissolved gas-oil ratio, the carbon dioxide content, the saturation pressure and the crude oil volume coefficient;

[0017] The injection-production ratio construction module is used to construct a calculation formula for the injection-production ratio in the process of circulating reinjection of produced gas containing carbon dioxide based on the crude oil high-pressure physical property map.

[0018] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0019] at least one processor; and

[0020] a memory communicatively connected to the at least one processor; wherein,

[0021] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute a method for calculating the injection-production ratio of water-gas alternating drive as described in any embodiment of the present invention.

[0022] According to another aspect of the present invention, a computer-readable medium is provided, wherein the computer-readable medium stores computer instructions for enabling a processor to implement a method for calculating injection-production ratio of water-gas alternating flooding as described in any embodiment of the present invention when the computer instructions are executed.

[0023] The technical solution of the embodiment of the present invention obtains the calculation formula of the underground crude oil dissolved gas-oil ratio during the target oil reservoir produced gas circulation reinjection process, and obtains the calculation formula of the carbon dioxide content during the target oil reservoir produced gas circulation reinjection process, and simulates the change law of the crude oil dissolved gas-oil ratio and the carbon dioxide content at different ratios according to the calculation formula of the underground crude oil dissolved gas-oil ratio and the calculation formula of the carbon dioxide content, and simulates the change of the high-pressure physical property of crude oil during the produced gas circulation reinjection process to obtain the saturation pressure change law and the crude oil volume coefficient change law, and then constructs the crude oil high-pressure physical property plate during the produced gas circulation reinjection process according to the change law of the crude oil dissolved gas-oil ratio, the change law of the carbon dioxide content, the change law of the saturation pressure and the change law of the crude oil volume coefficient, and then constructs the crude oil high-pressure physical property plate during the produced gas circulation reinjection process, and constructs the injection-production ratio calculation formula during the carbon dioxide produced gas circulation reinjection process based on the crude oil high-pressure physical property plate. This technical solution establishes an injection-production ratio calculation model based on the produced gas circulation reinjection water-gas alternating drive, which provides technical means for oilfield development effect evaluation, development adjustment, production regulation, etc.

[0024] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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.

[0026] Figure 1 This is a flow chart of a method for calculating the injection-production ratio of water-gas alternating flooding provided in accordance with the first embodiment of the present invention;

[0027] Figure 2 This is a diagram of the variation law of the solution gas-oil ratio provided in Example 1 of the present application;

[0028] Figure 3 This is a chart showing the variation of the crude oil volume coefficient provided in Example 1 of the present application;

[0029] Figure 4 This is a chart showing the variation of dissolved gas-oil ratio with the degree of production under different produced gas reinjection ratios provided in Example 1 of the present application;

[0030] Figure 5 This is a chart showing the variation of CO2 content ratio with the degree of production under different output gas reinjection ratios provided in Example 1 of the present application;

[0031] Figure 6 This is a chart showing the variation of bubble point pressure with the degree of production under different produced gas reinjection ratios provided in Example 1 of the present application;

[0032] Figure 7 This is a chart showing the variation of crude oil volume coefficient with the degree of recovery under different produced gas reinjection ratios provided in Example 1 of the present application;

[0033] Figure 8 2 is a schematic diagram of the structure of a device for calculating injection-production ratio of water-gas alternating flooding according to the second embodiment of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of an electronic device for implementing a method for calculating injection-production ratio of water-gas alternating drive in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that the term "target" and the like in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Embodiment 1

[0038] Figure 1This is a flow chart of a method for calculating the water-gas alternating drive injection-production ratio according to the first embodiment of the present invention. This embodiment is applicable to the case of constructing a water-gas alternating drive injection-production ratio model for recycling and reinjecting high-carbon dioxide output gas. The method can be executed by a water-gas alternating drive injection-production ratio calculation device, which can be implemented in the form of hardware and / or software, and can be configured in an electronic device. Figure 1 As shown, the method includes:

[0039] S110. Obtain a calculation formula for the dissolved gas-oil ratio of underground crude oil during the circulation reinjection process of the target oil reservoir's produced gas, and obtain a calculation formula for the carbon dioxide content during the circulation reinjection process of the target oil reservoir's produced gas.

[0040] In this plan, the target oil reservoir may refer to a deep-water thick carbonate oil reservoir, which is developed by alternating water and gas drive.

[0041] The dissolved gas-oil ratio refers to the amount of gas dissolved in a unit volume of ground crude oil at a certain temperature and pressure. The larger the dissolved gas-oil ratio, the larger the crude oil volume coefficient. In addition, the gas-oil ratio is also affected by temperature. As the temperature increases, the saturated vapor pressure of hydrocarbon components increases, the solubility of natural gas decreases, and the gas-oil ratio decreases.

[0042] In this embodiment, a calculation formula for the dissolved gas-oil ratio of underground crude oil during the produced gas circulation reinjection process can be derived based on the reservoir data obtained during the development process, and a calculation formula for the carbon dioxide content during the produced gas circulation reinjection process of the target oil reservoir can be derived.

[0043] Optionally, a calculation formula for the dissolved gas-oil ratio of underground crude oil during the target reservoir produced gas cycle reinjection process is obtained, including:

[0044] Obtain the original solution gas-oil ratio, production gas-oil ratio, original geological petroleum reserves, cumulative oil production, and produced gas reinjection ratio;

[0045] Determine the original total gas volume in the underground crude oil based on the original solution gas-oil ratio and the original petroleum geological reserves, and determine the output gas volume based on the production gas-oil ratio and the cumulative oil production;

[0046] According to the original total gas volume, produced gas volume, produced gas reinjection ratio, original petroleum geological reserves and cumulative oil production in the underground crude oil, a calculation formula for the dissolved gas-oil ratio of the underground crude oil during the circulation reinjection of produced gas in the target oil reservoir is constructed.

[0047] The production gas-oil ratio refers to the amount of natural gas produced per unit mass or volume of crude oil produced during the production process.

[0048] In this solution, the produced gas reinjection ratio can be set according to the continuous development requirements of the reservoir. For example, the produced gas reinjection ratio can be 50%.

[0049] In this embodiment, the original solution gas-oil ratio, the production gas-oil ratio, the original geological reserves of petroleum and the cumulative oil production can be obtained from the reservoir data.

[0050] Furthermore, the original solution gas-oil ratio and the original petroleum geological reserves can be combined to obtain the original total gas volume in the underground crude oil; and the production gas-oil ratio and the cumulative oil production can be combined to obtain the output gas volume.

[0051] In this scheme, after obtaining the original total gas volume and produced gas volume in the crude oil, the original total gas volume in the crude oil, the produced gas volume and the produced gas reinjection ratio, the original petroleum geological reserves and the cumulative oil production can be combined and calculated to construct a calculation formula for the underground crude oil dissolved gas-oil ratio during the produced gas circulation reinjection process of the target oil reservoir.

[0052] By constructing a calculation formula for the underground crude oil dissolved gas-oil ratio during the target reservoir's produced gas circulation reinjection process, the change law of the crude oil dissolved gas-oil ratio under different ratios can be simulated based on the calculation formula.

[0053] Optionally, determining the original total gas volume in the underground crude oil according to the original solution gas-oil ratio and the original petroleum geological reserves, and determining the output gas volume according to the production gas-oil ratio and the cumulative oil production, including:

[0054] The original total gas volume in the underground crude oil was determined using the following formula;

[0055] G i =OOIP*R si ;

[0056] Among them, G i Represents the original total gas volume in underground crude oil, R si represents the original solution gas-oil ratio, OOIP represents the original oil in place;

[0057] The output gas volume is determined using the following formula;

[0058] G=N P *GOR;

[0059] Among them, G represents the gas output, GOR represents the gas-oil ratio, and N P Indicates the cumulative oil production.

[0060] In this scheme, the original solution gas-oil ratio and the original petroleum geological reserves can be multiplied to obtain the original total gas volume in the underground crude oil; and the production gas-oil ratio and the cumulative oil production can be multiplied to obtain the output gas volume.

[0061] By determining the original total gas volume and produced gas volume in underground crude oil, a calculation formula for the dissolved gas-oil ratio of underground crude oil during the target reservoir produced gas circulation reinjection process can be constructed based on the original total gas volume and produced gas volume in underground crude oil, thereby simulating the change law of the dissolved gas-oil ratio of crude oil under different ratios.

[0062] Optionally, according to the original total gas volume, produced gas volume, produced gas reinjection ratio, original petroleum geological reserves and cumulative oil production in the underground crude oil, a calculation formula for the underground crude oil dissolved gas-oil ratio during the produced gas circulation reinjection process of the target oil reservoir is constructed, including:

[0063] The calculation formula of underground crude oil dissolved gas-oil ratio is constructed in the following way;

[0064]

[0065] Among them, R s It represents the gas-oil ratio of underground crude oil solution, and A represents the produced gas reinjection ratio.

[0066] In this embodiment, when the underground crude oil composition is constant and the formation pressure is higher than the saturation pressure, the crude oil dissolved gas-oil ratio is the original dissolved gas-oil ratio. As the high carbon dioxide-containing produced gas is continuously reinjected, the carbon dioxide content in the crude oil composition gradually increases, and the underground crude oil dissolved gas-oil ratio increases.

[0067] Furthermore, the original total gas volume in the underground crude oil, the produced gas volume, the produced gas reinjection ratio, the original petroleum geological reserves and the cumulative oil production can be combined and calculated to derive a calculation formula for the dissolved gas-oil ratio of the underground crude oil during the produced gas circulation reinjection process of the target oil reservoir.

[0068] By constructing a calculation formula for the underground crude oil dissolved gas-oil ratio during the target reservoir's produced gas circulation reinjection process, the change law of the crude oil dissolved gas-oil ratio under different ratios can be simulated based on the calculation formula.

[0069] Optionally, a calculation formula for the carbon dioxide content during the recycling and reinjection process of the produced gas from the target reservoir is obtained, including:

[0070] The carbon dioxide content calculation formula is constructed in the following way;

[0071]

[0072] Among them, W CO2 Indicates the original carbon dioxide content in the gas, V CO2i Represents the original volume of carbon dioxide in the gas.

[0073] In this scheme, it is assumed that W CO2i is the original CO2 content in the gas, then the original CO2 volume V in the gas CO2i for:

[0074] V CO2i =G i *W CO2i ;

[0075] Assuming that the ratio of produced gas reinjection is A, the CO2 content after CH4 (methane) is separated from the produced gas for external transmission or self-use and then reinjected into the ground is W CO2 for:

[0076]

[0077] By constructing a calculation formula for the carbon dioxide content in the target reservoir's produced gas cycle reinjection process, the variation pattern of carbon dioxide content under different proportions can be simulated based on the carbon dioxide content calculation formula.

[0078] S120, simulating the variation law of the dissolved gas-oil ratio of crude oil and the variation law of the carbon dioxide content at different ratios according to the calculation formula of the dissolved gas-oil ratio of underground crude oil and the calculation formula of the carbon dioxide content.

[0079] The ratio may refer to the ratio of gas for external transmission and gas for self-use, and the ratio may be determined based on whether CH4 is separated from the output gas for external transmission or self-use.

[0080] In this scheme, the variation law of crude oil dissolved gas-oil ratio may refer to the variation of crude oil dissolved gas-oil ratio with the degree of recovery; the variation law of carbon dioxide content may refer to the variation of carbon dioxide with the degree of recovery. Among them, the degree of recovery refers to the ratio of the cumulative oil production of an oil field at a certain time to the geological reserves, which is used to reflect the recovery of the reserves of the oil field.

[0081] In this embodiment, after obtaining the calculation formula for the underground crude oil dissolved gas-oil ratio and the calculation formula for the carbon dioxide content, the change law of the crude oil dissolved gas-oil ratio and the change law of the carbon dioxide content under different ratios of external gas and self-used gas can be simulated and calculated based on the calculation formula for the underground crude oil dissolved gas-oil ratio and the calculation formula for the carbon dioxide content.

[0082] S130. Simulate the change of high-pressure physical properties of crude oil during the production gas circulation and reinjection process to obtain the change law of saturation pressure and the change law of crude oil volume coefficient.

[0083] Among them, the high-pressure physical properties of crude oil can refer to the PTV physical properties of crude oil. PVT usually stands for Pressure, Volume and Temperature, and is a commonly used term in the petroleum industry. PVT properties refer to the physical properties of oil and natural gas at different temperatures and pressures, such as density, viscosity, phase change, etc. These properties have an important impact on the development, production and storage of the petroleum industry. PVT experiment refers to the pressure, volume and temperature test of oil or natural gas samples under laboratory conditions, and the PVT properties of the samples are determined by the experimental results. PVT analysis refers to laboratory testing of collected oil or natural gas samples, and further analysis of the physical properties, phase behavior and output of the samples to guide the extraction and production of oil and natural gas. In the petroleum industry, PVT testing and analysis are very important tasks, which can provide necessary data and information for petroleum engineers and geological engineers to help them optimize extraction plans, evaluate oil recovery effects, predict oil reservoir reserves, etc.

[0084] In this embodiment, the saturation pressure variation law may refer to the variation of the saturation pressure during the process of the crude oil PTV physical property changing, and the crude oil volume coefficient variation law may refer to the variation of the crude oil volume coefficient during the process of the crude oil PTV physical property changing.

[0085] In this scheme, simulation tools can be used to simulate the changes in crude oil PTV properties during the production gas recycling and reinjection process to obtain the saturation pressure change law and crude oil volume coefficient change law.

[0086] Optionally, simulate the change of crude oil high pressure physical properties during the produced gas cycle reinjection process to obtain the change law of saturation pressure and crude oil volume coefficient, including:

[0087] The pre-set phase analysis software is used to simulate the changes in the high-pressure physical properties of crude oil during the production gas recycling and reinjection process, and the change laws of the saturation pressure and the volume coefficient of crude oil are obtained.

[0088] The phase analysis software may refer to PVTi.

[0089] Specifically, a DL (multiple flash) experiment is set up in PVTi to simulate the changes in the physical properties of crude oil PTV during the production gas recycling and reinjection process, so that the saturation pressure change law and the crude oil volume coefficient change law can be obtained. Among them, as the proportion of carbon dioxide content in the crude oil components increases, the saturation pressure gradually increases, and the corresponding crude oil volume coefficient under the saturation pressure also increases accordingly.

[0090] By simulating the variation law of saturation pressure and crude oil volume coefficient, it is possible to construct a high-pressure physical property map of crude oil during the production gas recycling and reinjection process based on the variation law of saturation pressure and crude oil volume coefficient.

[0091] S140. Construct a high-pressure physical property map of crude oil during the production gas recycling process according to the variation law of the crude oil dissolved gas-oil ratio, the carbon dioxide content, the saturation pressure and the crude oil volume coefficient.

[0092] In this embodiment, reservoir exploration technology can be used to construct a high-pressure physical property map of crude oil during the production gas recycling process based on the change law of crude oil dissolved gas-oil ratio, carbon dioxide content, saturation pressure and crude oil volume coefficient.

[0093] S150. Based on the crude oil high-pressure physical property map, a calculation formula for the injection-production ratio during the recycling and reinjection process of the produced gas containing carbon dioxide is constructed.

[0094] In this scheme, the high-pressure physical property plate of crude oil can be referred to to derive the calculation formula of the injection-production ratio of the reservoir during the circulation and reinjection of produced gas, that is, the calculation formula of the injection-production ratio during the circulation and reinjection of produced gas containing carbon dioxide can be derived.

[0095] Optionally, based on the crude oil high-pressure physical property plate, a calculation formula for the injection-production ratio in the recycling and reinjection process of the produced gas containing carbon dioxide is constructed, including:

[0096] The injection-production ratio calculation formula in the recycling and reinjection process of produced gas containing carbon dioxide is constructed in the following way;

[0097]

[0098] Where J represents the injection-production ratio, B o represents the crude oil volume coefficient, B oi represents the original volume coefficient of crude oil, Represents the average volume coefficient of crude oil, W i Indicates the amount of water injected, W p Indicates the amount of water produced.

[0099] In this scheme, the original geological petroleum reserves, cumulative oil production, crude oil volume coefficient, crude oil original volume coefficient, crude oil average volume coefficient, injected water volume and produced water volume can be combined to construct a calculation formula for the injection-production ratio in the process of circulating reinjection of carbon dioxide-containing produced gas.

[0100] By establishing a calculation model for injection-production ratio based on the circulation and reinjection of produced gas and alternating water and gas drive, technical means can be provided for oilfield development effect evaluation, development adjustment, production regulation, etc.

[0101] The technical solution of the embodiment of the present invention obtains the calculation formula of the underground crude oil dissolved gas-oil ratio during the target oil reservoir produced gas circulation reinjection process, and obtains the calculation formula of the carbon dioxide content during the target oil reservoir produced gas circulation reinjection process, and simulates the change law of the crude oil dissolved gas-oil ratio and the carbon dioxide content at different proportions according to the calculation formula of the underground crude oil dissolved gas-oil ratio and the calculation formula of the carbon dioxide content, and simulates the change of the high-pressure physical property of crude oil during the produced gas circulation reinjection process to obtain the saturation pressure change law and the crude oil volume coefficient change law, and then constructs the crude oil high-pressure physical property plate during the produced gas circulation reinjection process according to the change law of the crude oil dissolved gas-oil ratio, the change law of the carbon dioxide content, the change law of the saturation pressure and the change law of the crude oil volume coefficient, and then constructs the crude oil high-pressure physical property plate during the produced gas circulation reinjection process, and constructs the injection-production ratio calculation formula during the carbon dioxide produced gas circulation reinjection process based on the crude oil high-pressure physical property plate. By executing this technical solution, a calculation model of the injection-production ratio based on the water-gas alternating drive of the produced gas circulation reinjection is established, which provides technical means for the development effect evaluation, development adjustment, production regulation, etc. of the oil field.

[0102] In this scheme, a carbonate reservoir in a certain area is used for recycling and reinjection of high-CO2 produced gas and water-gas alternating flooding. The produced gas is exported and reinjected after self-use in a certain proportion. A DL (multiple flash) experiment is set up in PVTi to simulate the changes in crude oil PVT physical properties during the produced gas reinjection process. Figure 2 This is a diagram of the variation of the dissolved gas-oil ratio provided in Example 1 of the present application. Figure 3 This is a chart showing the variation of the crude oil volume coefficient provided in Example 1 of the present application, such as Figure 2 and Figure 3 As shown, the change patterns of dissolved gas-oil ratio and crude oil volume coefficient are obtained respectively.

[0103] Furthermore, Figure 4 This is a chart showing the variation of dissolved gas-oil ratio with the degree of production under different produced gas reinjection ratios provided in Example 1 of the present application; Figure 5 This is a chart showing the variation of CO2 content ratio with the degree of production under different output gas reinjection ratios provided in Example 1 of the present application; Figure 6 This is a chart showing the variation of bubble point pressure with the degree of production under different produced gas reinjection ratios provided in Example 1 of the present application; Figure 7 It is a chart showing the variation of crude oil volume coefficient with the degree of recovery under different produced gas reinjection ratios provided in Example 1 of the present application; according to the actual geological reserves and production dynamic parameters of the target oil reservoir, scenarios with produced gas reinjection ratios of 87%, 50% and 30% are considered respectively, and based on the above steps, the chart showing the variation of crude oil dissolved gas-oil ratio, CO2 content proportion, bubble point pressure and crude oil volume coefficient with the degree of recovery can be obtained respectively, so that a calculation model for the injection-production ratio based on produced gas circulation reinjection and water-gas alternating drive can be constructed based on the chart showing the variation of crude oil dissolved gas-oil ratio, CO2 content proportion, bubble point pressure and crude oil volume coefficient with the degree of recovery.

[0104] Embodiment 2

[0105] Figure 8 Schematic diagram of the structure of a water-gas alternating flooding injection-production ratio calculation device provided according to the second embodiment of the present invention. Figure 8 As shown, the device comprises:

[0106] The calculation formula acquisition module 810 is used to obtain the calculation formula of the underground crude oil dissolved gas-oil ratio during the target oil reservoir produced gas circulation reinjection process, and to obtain the calculation formula of the carbon dioxide content during the target oil reservoir produced gas circulation reinjection process;

[0107] The variation law simulation module 820 is used to simulate the variation law of the crude oil dissolved gas-oil ratio and the carbon dioxide content under different ratios according to the calculation formula of the underground crude oil dissolved gas-oil ratio and the calculation formula of the carbon dioxide content;

[0108] The variation law obtaining module 830 is used to simulate the variation of the high-pressure physical properties of crude oil during the production gas circulation and reinjection process, and obtain the variation law of the saturation pressure and the variation law of the crude oil volume coefficient;

[0109] A crude oil high-pressure physical property map construction module 840 is used to construct a crude oil high-pressure physical property map during the production gas recycling and reinjection process according to the variation law of the crude oil dissolved gas-oil ratio, the carbon dioxide content, the saturation pressure and the crude oil volume coefficient;

[0110] The injection-production ratio construction module 850 is used to construct a calculation formula for the injection-production ratio in the process of circulating reinjection of the produced gas containing carbon dioxide based on the crude oil high-pressure physical property map.

[0111] Optionally, the calculation formula acquisition module 810 includes:

[0112] The parameter acquisition submodule is used to obtain the original dissolved gas-oil ratio, produced gas-oil ratio, original petroleum geological reserves, cumulative oil production, and produced gas reinjection ratio;

[0113] A parameter calculation submodule, for determining the original total gas volume in the underground crude oil according to the original solution gas-oil ratio and the original petroleum geological reserves, and for determining the output gas volume according to the production gas-oil ratio and the cumulative oil production;

[0114] The submodule for constructing a calculation formula for the underground crude oil dissolved gas-oil ratio is used to construct a calculation formula for the underground crude oil dissolved gas-oil ratio during the target oil reservoir produced gas circulation reinjection process based on the original total gas volume, produced gas volume, produced gas reinjection ratio, original petroleum geological reserves and cumulative oil production in the underground crude oil.

[0115] Optional parameter calculation submodule, specifically used for:

[0116] The original total gas volume in the underground crude oil was determined using the following formula;

[0117] G i =OOIP*R si ;

[0118] Among them, G i Represents the original total gas volume in underground crude oil, R si represents the original solution gas-oil ratio, OOIP represents the original oil in place;

[0119] The output gas volume is determined using the following formula;

[0120] G=N P *GOR;

[0121] Among them, G represents the gas output, GOR represents the gas-oil ratio, and N P Indicates the cumulative oil production.

[0122] Optionally, a calculation formula for underground crude oil dissolved gas-oil ratio is constructed as a submodule, specifically used for:

[0123] The calculation formula of underground crude oil dissolved gas-oil ratio is constructed in the following way;

[0124]

[0125] Among them, R s It represents the gas-oil ratio of underground crude oil solution, and A represents the produced gas reinjection ratio.

[0126] Optionally, the calculation formula acquisition module 810 is further used to:

[0127] The carbon dioxide content calculation formula is constructed in the following way;

[0128]

[0129] Among them, W CO2 Indicates the original carbon dioxide content in the gas, V CO2i Represents the original volume of carbon dioxide in the gas.

[0130] Optionally, the injection-production ratio building module 850 is specifically used to:

[0131] The injection-production ratio calculation formula in the recycling and reinjection process of produced gas containing carbon dioxide is constructed in the following way;

[0132]

[0133] Where J represents the injection-production ratio, B o represents the crude oil volume coefficient, B oi represents the original volume coefficient of crude oil, represents the average volume coefficient of crude oil, W i Indicates the amount of water injected, W p Indicates the amount of water produced.

[0134] Optionally, the change rule obtaining module 830 is specifically used for:

[0135] The pre-set phase analysis software is used to simulate the changes in the high-pressure physical properties of crude oil during the production gas recycling and reinjection process, and the change laws of the saturation pressure and the volume coefficient of crude oil are obtained.

[0136] A water-gas alternating flooding injection-production ratio calculation device provided in an embodiment of the present invention can execute a water-gas alternating flooding injection-production ratio calculation method provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0137] Embodiment 3

[0138] Fig. 9 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0139] like Fig. 9 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0140] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0141] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for calculating the injection-production ratio of water-gas alternating flooding.

[0142] In some embodiments, a method for calculating the injection-production ratio of water-gas alternating drive can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for calculating the injection-production ratio of water-gas alternating drive described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute a method for calculating the injection-production ratio of water-gas alternating drive in any other appropriate manner (for example, by means of firmware).

[0143] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0144] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0145] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0146] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0147] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0148] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0149] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0150] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating the injection-production ratio of water-gas alternating flooding, characterized in that: include: Obtaining a calculation formula for the dissolved gas-oil ratio of underground crude oil during the recycling and reinjection process of the target oil reservoir's produced gas, and obtaining a calculation formula for the carbon dioxide content during the recycling and reinjection process of the target oil reservoir's produced gas; According to the calculation formula of underground crude oil dissolved gas-oil ratio and carbon dioxide content, simulate the change law of crude oil dissolved gas-oil ratio and carbon dioxide content at different ratios; Simulate the changes in high-pressure physical properties of crude oil during the production gas recycling process to obtain the change laws of saturation pressure and crude oil volume coefficient; According to the variation law of the crude oil dissolved gas-oil ratio, the carbon dioxide content, the saturation pressure and the crude oil volume coefficient, a high-pressure physical property map of crude oil during the produced gas circulation and reinjection process is constructed; Based on the crude oil high-pressure physical property atlas, a calculation formula for the injection-production ratio during the recycling and reinjection process of the produced gas containing carbon dioxide is constructed.

2. The method according to claim 1, characterized in that The calculation formula for the dissolved gas-oil ratio of underground crude oil during the target reservoir production gas cycle reinjection process is obtained, including: Obtain the original solution gas-oil ratio, production gas-oil ratio, original geological petroleum reserves, cumulative oil production, and produced gas reinjection ratio; Determine the original total gas volume in the underground crude oil based on the original solution gas-oil ratio and the original petroleum geological reserves, and determine the output gas volume based on the production gas-oil ratio and the cumulative oil production; According to the original total gas volume, produced gas volume, produced gas reinjection ratio, original petroleum geological reserves and cumulative oil production in the underground crude oil, a calculation formula for the dissolved gas-oil ratio of the underground crude oil during the circulation reinjection of produced gas in the target oil reservoir is constructed.

3. The method according to claim 2, characterized in that Determining the original total gas volume in the underground crude oil according to the original solution gas-oil ratio and the original petroleum geological reserves, and determining the output gas volume according to the production gas-oil ratio and the cumulative oil production, including: The following formula is used to determine the original total gas volume in the underground crude oil; G i =OOIP*R si Among them, G i Represents the original total gas volume in underground crude oil, R si represents the original solution gas-oil ratio, OOIP represents the original oil in place; The output gas volume is determined using the following formula; G=N p *GO; Among them, G represents the gas output, GOR represents the gas-oil ratio, and N P Indicates the cumulative oil production.

4. The method according to claim 3, characterized in that According to the original total gas volume, produced gas volume, produced gas reinjection ratio, original petroleum geological reserves and cumulative oil production in the underground crude oil, a calculation formula for the dissolved gas-oil ratio of the underground crude oil during the produced gas circulation reinjection process of the target oil reservoir is constructed, including: The calculation formula of underground crude oil dissolved gas-oil ratio is constructed in the following way; Among them, R s It represents the gas-oil ratio of underground crude oil solution, and A represents the produced gas reinjection ratio.

5. The method according to claim 4, characterized in that Obtain the calculation formula for the carbon dioxide content during the target reservoir produced gas cycle reinjection process, including: The carbon dioxide content calculation formula is constructed in the following way; Among them, W CO2 Indicates the original carbon dioxide content in the gas, V CO2i Represents the original volume of carbon dioxide in the gas.

6. The method according to claim 3, characterized in that Based on the crude oil high-pressure physical property plate, a calculation formula for the injection-production ratio in the recycling and reinjection process of the produced gas containing carbon dioxide is constructed, including: The injection-production ratio calculation formula in the recycling and reinjection process of produced gas containing carbon dioxide is constructed in the following way; Where J represents the injection-production ratio, B o represents the crude oil volume coefficient, B oi represents the original volume coefficient of crude oil, Represents the average volume coefficient of crude oil, W i Indicates the amount of water injected, W p Indicates the amount of water produced.

7. The method according to claim 1, characterized in that By simulating the changes in the high-pressure physical properties of crude oil during the production gas cycle reinjection process, the saturation pressure change law and the crude oil volume coefficient change law are obtained, including: The pre-set phase analysis software is used to simulate the changes in the high-pressure physical properties of crude oil during the production gas recycling and reinjection process, and the change laws of the saturation pressure and the volume coefficient of crude oil are obtained.

8. A device for calculating injection-production ratio of water-gas alternating flooding, characterized in that: include: A calculation formula acquisition module is used to obtain a calculation formula for the dissolved gas-oil ratio of underground crude oil during the circulation and reinjection process of the target oil reservoir produced gas, and to obtain a calculation formula for the carbon dioxide content during the circulation and reinjection process of the target oil reservoir produced gas; A variation law simulation module is used to simulate the variation law of the crude oil dissolved gas-oil ratio and the carbon dioxide content under different proportions according to the calculation formula of the underground crude oil dissolved gas-oil ratio and the calculation formula of the carbon dioxide content; The module for obtaining the change law is used to simulate the change of the high-pressure physical properties of crude oil during the production gas recycling and reinjection process, and obtain the change law of the saturation pressure and the change law of the crude oil volume coefficient; A crude oil high-pressure physical property chart construction module is used to construct a crude oil high-pressure physical property chart during the production gas circulation and reinjection process according to the variation law of the crude oil dissolved gas-oil ratio, the carbon dioxide content, the saturation pressure and the crude oil volume coefficient; The injection-production ratio construction module is used to construct a calculation formula for the injection-production ratio in the process of circulating reinjection of produced gas containing carbon dioxide based on the crude oil high-pressure physical property map.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute a method for calculating the injection-production ratio of water-gas alternating drive according to any one of claims 1-7.

10. A computer-readable medium, characterized in that The computer-readable medium stores computer instructions, and the computer instructions are used to enable a processor to implement a method for calculating the injection-production ratio of water-gas alternating flooding according to any one of claims 1-7 when executing the computer instructions.

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