A water-gas alternating displacement injection-production ratio calculation method and device, electronic equipment and medium

Abstract

The application discloses a kind of water-gas alternating drive injection-production ratio calculation method, device, electronic equipment and medium.The method includes according to underground crude oil dissolved gas oil ratio calculation formula and carbon dioxide content calculation formula, simulates the change rule of crude oil dissolved gas oil ratio and the change rule of carbon dioxide content under different proportions;Simulate the change of crude oil high pressure property in the process of output gas recycling injection, obtain the change rule of saturation pressure and the change rule of crude oil volume coefficient;According to the change rule of crude oil dissolved gas oil ratio, the change rule of carbon dioxide content, the change rule of saturation pressure and the change rule of crude oil volume coefficient, construct crude oil high pressure property chart in the process of output gas recycling injection;Based on crude oil high pressure property chart, construct injection-production ratio calculation formula in the process of output gas recycling injection with carbon dioxide.This technical scheme, establish based on output gas recycling injection water-gas alternating drive injection-production ratio calculation model, provide technical means for the development effect evaluation, development adjustment, production control etc.of oil field.

Description

Technical Field

[0001] The present 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 the injection-production ratio of water-gas alternating flooding. Background Art

[0002] Because deepwater, thick carbonate reservoirs have high dissolved gas-to-oil ratios and high CO2 (carbon dioxide) content in their produced gas, and deepwater oilfields are located far from onshore, their produced gas cannot be transported externally. Environmental protection regulations necessitate separating some of the methane from the produced gas and injecting it alternately with water into the reservoir, achieving water-gas alternating miscible flooding. With continued oilfield development, this reinjection of produced gas gradually increases the dissolved gas-to-oil ratio of the underground crude oil and the CO2 content in the dissolved gas, leading to changes in reservoir fluid properties and consequently, changes in the miscible pressure and miscible characteristics of water-gas alternating flooding. The injection-production ratio is a key development parameter in both water and gas injection production in oilfields.

[0003] Currently, 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 applicable to 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 to grasp the injection-production balance in real time, it is necessary to establish a calculation method for the injection-production ratio of water-gas alternating miscible flooding with recycled 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 flooding, establishes a water-gas alternating flooding injection-production ratio calculation model based on the recycling 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 alternating water-gas 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 of produced gas from the target oil reservoir, and obtaining a calculation formula for the carbon dioxide content during the recycling and reinjection of produced gas from the target oil reservoir;

[0008] According to the calculation formula of underground crude oil dissolved gas-oil ratio and carbon dioxide content, the variation law of crude oil dissolved gas-oil ratio and carbon dioxide content under different ratios is simulated;

[0009] Simulate the changes in crude oil high-pressure physical properties during the production gas recycling process to obtain the change patterns of saturation pressure and crude oil volume coefficient;

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

[0011] 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 produced gas containing carbon dioxide is constructed.

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

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

[0014] a change law simulation module for simulating the change law of the crude oil dissolved gas-oil ratio and the carbon dioxide content under different ratios according to the calculation formula for the underground crude oil dissolved gas-oil ratio and the calculation formula for the carbon dioxide content;

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

[0016] A crude oil high-pressure physical property map construction module is used to construct a crude oil high-pressure physical property map during the production gas recycling and reinjection process based on 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, 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 the method for calculating the water-gas alternating flooding injection-production ratio described in any embodiment of the present invention.

[0022] According to another aspect of the present application, there is provided a computer readable medium storing computer instructions for causing a processor to implement the water-gas alternating displacement injection-production ratio calculation method according to any of the embodiments of the present application when executed.

[0023] The technical scheme of the embodiment of the present application comprises the following steps: obtaining a formula for calculating the dissolved gas-oil ratio of crude oil in the target oil reservoir during the recycling injection of produced gas, and obtaining a formula for calculating the carbon dioxide content in the target oil reservoir during the recycling injection of produced gas; simulating the change law of the dissolved gas-oil ratio of crude oil and the change law of the carbon dioxide content at different ratios according to the formula for calculating the dissolved gas-oil ratio of crude oil and the formula for calculating the carbon dioxide content; simulating the change of the high-pressure physical properties of crude oil during the recycling injection of produced gas to obtain the change law of the saturation pressure and the change law of the volume factor of crude oil; and constructing a high-pressure physical property chart of crude oil during the recycling injection of produced gas according to the change law of the dissolved gas-oil ratio of crude oil, the change law of the carbon dioxide content, the change law of the saturation pressure, and the change law of the volume factor of crude oil, and constructing the injection-production ratio calculation formula during the recycling injection of produced gas containing carbon dioxide based on the high-pressure physical property chart of crude oil. The technical scheme establishes a water-gas alternating displacement injection-production ratio calculation model based on the recycling injection of produced gas, and provides a technical means for the development effect evaluation, development adjustment, and production control of an oilfield.

[0024] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a flow chart of a water-gas alternating displacement injection-production ratio calculation method provided by the first embodiment of the present application;

[0027] Figure 2 is a dissolved gas-oil ratio change law chart provided by the first embodiment of the present application;

[0028] Figure 3 is a volume factor change law chart of crude oil provided by the first embodiment of the present application;

[0029] Figure 4 is a dissolved gas-oil ratio change chart with production degree of change under different recycling injection ratios of produced gas provided by the first embodiment of the present application;

[0030] Figure 5 is a CO2 content ratio change graph with production degree provided by the embodiment one of the present application under different produced gas reinjection ratios;

[0031] Figure 6 is a bubble point pressure change graph with production degree provided by the embodiment one of the present application under different produced gas reinjection ratios;

[0032] Figure 7 is a crude oil volume coefficient change graph with production degree provided by the embodiment one of the present application under different produced gas reinjection ratios;

[0033] Figure 8 is a structure schematic diagram of a water-gas alternating drive injection-production ratio calculation device according to the embodiment two of the present application;

[0034] Figure 9 is a structure schematic diagram of an electronic device for realizing a water-gas alternating drive injection-production ratio calculation method. DETAILED DESCRIPTION

[0035] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiment of the present application will be described clearly and completely below in combination with the drawings in the embodiment of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0036] It should be noted that the terms "target" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] Embodiment one

[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 construction of a water-gas alternating drive injection-production ratio model for recycling high-carbon dioxide output gas. The method can be executed by a water-gas alternating drive injection-production ratio calculation device. The water-gas alternating drive injection-production ratio calculation device can be implemented in the form of hardware and / or software. The water-gas alternating drive injection-production ratio calculation device 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 recycling and reinjection process of the produced gas from the target oil reservoir, and obtain a calculation formula for the carbon dioxide content during the recycling and reinjection process of the produced gas from the target oil reservoir.

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

[0041] The dissolved gas-oil ratio refers to the amount of gas dissolved in a unit volume of surface crude oil at a certain temperature and pressure. A higher dissolved gas-oil ratio indicates a greater crude oil volume coefficient. Furthermore, the gas-oil ratio is affected by temperature. As temperature rises, 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 recycling and 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 recycling and reinjection process of the target reservoir can be derived.

[0043] Optionally, a calculation formula for the dissolved gas-oil ratio of underground crude oil during the recycling and reinjection of produced gas from the target reservoir 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] determining 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 determining the produced gas volume based on the produced gas-oil ratio and the cumulative oil production;

[0046] 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, a calculation formula for the underground crude oil dissolved gas-oil ratio during the target oil reservoir produced gas cyclic reinjection process 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 needs of continued reservoir development. For example, the produced gas reinjection ratio can be 50%.

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

[0050] Furthermore, the original dissolved 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 produced 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 recycling 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 recycling and reinjection process, the changing 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 based on the original solution gas-oil ratio and the original petroleum geological reserves, and determining the produced gas volume based on the production gas-oil ratio and the cumulative oil production, includes:

[0054] The following formula is used to determine the original total gas volume in the underground crude oil;

[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 gas output 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 total gas volume in the underground crude oil can be obtained by multiplying the original solution gas-oil ratio and the original oil geological reserves; and the produced gas-oil ratio and the cumulative oil production can be multiplied to obtain the produced gas volume.

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

[0062] Optionally, 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, a calculation formula for the underground crude oil dissolved gas-oil ratio during the produced gas recycling reinjection process of the target oil reservoir is constructed, including:

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

[0064]

[0065] Among them, R s 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-CO2 produced gas is continuously reinjected, the CO2 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 underground crude oil, produced gas volume, produced gas reinjection ratio, original petroleum geological reserves and cumulative oil production can be combined and calculated to derive a calculation formula for the dissolved gas-oil ratio of underground crude oil during the production gas recycling 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 recycling and reinjection process, the changing law of the crude oil dissolved gas-oil ratio under different ratios can be simulated based on the calculation formula.

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

[0070] The carbon dioxide content calculation formula is constructed as follows;

[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] Similarly, assuming that the output gas reinjection ratio is A, the CO2 content ratio after the output gas is separated from CH4 (methane) and then injected back into the ground is W CO2 is:

[0076]

[0077] By constructing the carbon dioxide content calculation formula in the process of recycling the output gas of the target oil reservoir, the carbon dioxide content change rule under different ratios can be simulated based on the carbon dioxide content calculation formula.

[0078] S120, according to the underground crude oil dissolved gas oil ratio calculation formula and the carbon dioxide content calculation formula, simulate the change rule of the crude oil dissolved gas oil ratio and the change rule of the carbon dioxide content under different ratios.

[0079] Wherein, the ratio can refer to the ratio of the output gas and the self-use gas, which can be determined according to the separation of the output gas from CH4.

[0080] In this scheme, the change rule of the crude oil dissolved gas oil ratio can refer to the change of the crude oil dissolved gas oil ratio with the recovery degree; the change rule of the carbon dioxide content can refer to the change of the carbon dioxide with the recovery degree. Wherein, the recovery degree refers to the ratio of the cumulative oil production of the oilfield at a certain time to the geological reserves, which is used to reflect the recovery of the oilfield reserves.

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

[0082] S130, simulate the change of the high pressure property of the crude oil in the process of recycling the output gas, and obtain the change rule of the saturation pressure and the change rule of the crude oil volume factor.

[0083] Among them, the high-pressure physical properties of crude oil may refer to the PTV 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 sample are determined by the experimental results. PVT analysis refers to laboratory testing of collected oil or natural gas samples to further analyze the physical properties, phase behavior and output of the samples to guide oil and natural gas extraction and production. In the petroleum industry, PVT testing and analysis are very important tasks, which can provide petroleum engineers and geological engineers with necessary data and information 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 process, and the change patterns of saturation pressure and crude oil volume coefficient can be obtained.

[0086] Optionally, simulate the changes in crude oil high-pressure physical properties during the produced gas recycling process to obtain the saturation pressure change pattern and crude oil volume coefficient change pattern, including:

[0087] Using pre-set phase analysis software, the changes in high-pressure physical properties of crude oil during the production gas recycling process were simulated to obtain the change patterns of saturation pressure and crude oil volume coefficient.

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

[0089] Specifically, a DL (multiple flash) experiment was set up in PVTi to simulate the changes in crude oil PTV properties during the production gas recycling process. This allowed us to determine the variations in saturation pressure and crude oil volume coefficient. As the carbon dioxide content in the crude oil increases, the saturation pressure gradually increases, and the crude oil volume coefficient at the corresponding saturation pressure also increases.

[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, constructing a crude oil high-pressure physical property chart in the process of recycling produced gas according to the variation law of the crude oil dissolved gas-oil ratio, the variation law of the carbon dioxide content, the variation law of the saturation pressure, and the variation law of the crude oil volume factor.

[0092] In the embodiment, the reservoir exploration technology can be used to construct a crude oil high-pressure physical property chart in the process of recycling produced gas according to the variation law of the crude oil dissolved gas-oil ratio, the variation law of the carbon dioxide content, the variation law of the saturation pressure, and the variation law of the crude oil volume factor.

[0093] S150, constructing an injection-production ratio calculation formula in the process of recycling produced gas containing carbon dioxide based on the crude oil high-pressure physical property chart.

[0094] In the scheme, the injection-production ratio calculation formula in the process of recycling produced gas can be derived by referring to the crude oil high-pressure physical property chart, that is, the injection-production ratio calculation formula in the process of recycling produced gas containing carbon dioxide can be derived.

[0095] Optionally, the injection-production ratio calculation formula in the process of recycling produced gas containing carbon dioxide is constructed based on the crude oil high-pressure physical property chart, and the method comprises the following steps.

[0096] The injection-production ratio calculation formula in the process of recycling produced gas containing carbon dioxide is constructed in the following manner.

[0097]

[0098] wherein, J represents the injection-production ratio, B o represents the crude oil volume factor, B oi represents the crude oil original volume factor, represents the crude oil average volume factor, W i represents the injected water volume, W p represents the produced water volume.

[0099] In the scheme, the injection-production ratio calculation formula in the process of recycling produced gas containing carbon dioxide can be constructed by combining and operating the original petroleum geological reserves, the cumulative oil production, the crude oil volume factor, the crude oil original volume factor, the crude oil average volume factor, the injected water volume, and the produced water volume.

[0100] By establishing the injection-production ratio calculation model based on the water-gas alternating drive in the process of recycling produced gas, technical means can be provided for the development effect evaluation, development adjustment, and production control of an oilfield.

[0101] The technical solution of the embodiment of the present invention obtains a calculation formula for the underground crude oil dissolved gas-oil ratio during the target oil reservoir's produced gas recycling and reinjection process, and obtains a calculation formula for the carbon dioxide content during the target oil reservoir's produced gas recycling and reinjection process. Based on the calculation formula for the underground crude oil dissolved gas-oil ratio and the calculation formula for the carbon dioxide content, the variation patterns of the crude oil dissolved gas-oil ratio and the carbon dioxide content at different ratios are simulated, and the variation patterns of the high-pressure physical properties of the crude oil during the produced gas recycling and reinjection process are simulated to obtain the variation patterns of the saturation pressure and the crude oil volume coefficient. Then, based on the variation patterns 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 the crude oil during the produced gas recycling and reinjection process is constructed. Based on the high-pressure physical property map of the crude oil, a calculation formula for the injection-production ratio during the produced gas recycling and reinjection process containing carbon dioxide is constructed. By implementing this technical solution, a calculation model for the injection-production ratio based on water-gas alternating flooding during the produced gas recycling and reinjection process is established, providing technical means for oilfield development effect evaluation, development adjustment, production regulation, etc.

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

[0103] Further, Figure 4 This is a chart showing the variation of dissolved gas-oil ratio with the degree of recovery under different produced gas reinjection ratios provided in Example 1 of the present application; Figure 5 This is a chart showing the change in CO2 content with the degree of recovery under different produced gas reinjection ratios provided in Example 1 of the present application; Figure 6 This is a chart showing the change of bubble point pressure with the degree of recovery under different produced gas reinjection ratios provided in Example 1 of the present application; Figure 7 This is a chart showing how the crude oil volume coefficient changes 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. Based on the above steps, charts showing how the crude oil dissolved gas-oil ratio, CO2 content percentage, bubble point pressure and crude oil volume coefficient change with the degree of recovery can be obtained respectively, thereby enabling a calculation model for the injection-production ratio based on produced gas circulation reinjection of water and gas alternating drive to be constructed based on the chart showing how the crude oil dissolved gas-oil ratio, CO2 content percentage, bubble point pressure and crude oil volume coefficient change with the degree of recovery.

[0104] Example 2

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

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

[0107] A variation pattern simulation module 820 is used to simulate the variation pattern of the crude oil dissolved gas-oil ratio and the carbon dioxide content at different ratios according to the calculation formula for the underground crude oil dissolved gas-oil ratio and the calculation formula for 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 recycling 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 produced gas recycling and reinjection process based on the variation patterns of the crude oil dissolved gas-oil ratio, carbon dioxide content, saturation pressure, and 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 recycling and reinjection process 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 geological petroleum 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 based on the original dissolved gas-oil ratio and the original petroleum geological reserves, and determining the produced gas volume based on the produced 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 recycling 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 following formula is used to determine the original total gas volume in the underground crude oil;

[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 gas output 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 submodule for constructing a formula for calculating the dissolved gas-oil ratio of underground crude oil is used to:

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

[0124]

[0125] Among them, R s 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 configured to:

[0127] The carbon dioxide content calculation formula is constructed as follows;

[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 calculation formula for the injection-production ratio during the recycling and reinjection of produced gas containing carbon dioxide is constructed in the following way;

[0132]

[0133] Among them, J represents the injection-production ratio, B o Indicates the crude oil volume coefficient, B oi represents the original volume coefficient of crude oil, Indicates 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 configured to:

[0135] Using pre-set phase analysis software, the changes in high-pressure physical properties of crude oil during the production gas recycling process were simulated to obtain the change patterns of saturation pressure and crude oil volume coefficient.

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

[0137] Example 3

[0138] Figure 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 claimed herein.

[0139] like Figure 9 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. 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 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0140] Multiple 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 magnetic 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 via a computer network such as the Internet and / or various telecommunication networks.

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

[0142] In some embodiments, a method for calculating the injection-production ratio of alternating water and gas flooding 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 alternating water and gas flooding described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute a method for calculating the injection-production ratio of alternating water and gas flooding by any other appropriate means (for example, by means of firmware).

[0143] Various embodiments of the systems and techniques described 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), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes 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, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

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

[0146] To provide interaction with a user, the systems and techniques described herein can 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 pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0147] The systems and techniques described herein can be implemented in a computing system that includes back-end 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 front-end components (e.g., a user computer with a graphical user interface or 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 back-end components, middleware components, or front-end components. The components of the system can 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 clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0149] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0150] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection 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 of produced gas from the target oil reservoir, and obtaining a calculation formula for the carbon dioxide content during the recycling and reinjection of produced gas from the target oil reservoir; According to the calculation formula of underground crude oil dissolved gas-oil ratio and carbon dioxide content, the variation law of crude oil dissolved gas-oil ratio and carbon dioxide content under different ratios is simulated; Simulate the changes in crude oil high-pressure physical properties during the production gas recycling process to obtain the change patterns of saturation pressure and crude oil volume coefficient; According to the variation law of the crude oil dissolved gas-oil ratio, carbon dioxide content, saturation pressure and crude oil volume coefficient, a high-pressure physical property map of crude oil during the produced gas recycling process is constructed; 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 produced gas containing carbon dioxide is constructed.

2. The method according to claim 1, characterized in that Obtain the calculation formula for the underground crude oil dissolved gas-oil ratio during the target reservoir's produced gas recycling process, including: Obtain the original solution gas-oil ratio, production gas-oil ratio, original geological petroleum reserves, cumulative oil production, and produced gas reinjection ratio; determining 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 determining the produced gas volume based on the produced gas-oil ratio and the cumulative oil production; 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, a calculation formula for the underground crude oil dissolved gas-oil ratio during the target oil reservoir produced gas cyclic reinjection process is constructed.

3. The method according to claim 2, characterized in that Determining 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 determining the produced gas volume based on the produced 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 gas output 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 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, a calculation formula for the underground crude oil dissolved gas-oil ratio during the produced gas recycling reinjection process of the target oil reservoir is constructed, including: The calculation formula for the dissolved gas-oil ratio of underground crude oil is constructed in the following way; Among them, R s 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 recycling and reinjection process of the produced gas from the target reservoir, including: The carbon dioxide content calculation formula is constructed as follows; 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 chart, a calculation formula for the injection-production ratio during the recycling and reinjection of produced gas containing carbon dioxide is constructed, including: The calculation formula for the injection-production ratio during the recycling and reinjection of produced gas containing carbon dioxide is constructed in the following way; Among them, J represents the injection-production ratio, B o Indicates the crude oil volume coefficient, B oi represents the original volume coefficient of crude oil, Indicates 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 crude oil high-pressure physical properties during the production gas recycling process, the variation patterns of saturation pressure and crude oil volume coefficient were obtained, including: Using pre-set phase analysis software, the changes in high-pressure physical properties of crude oil during the production gas recycling process were simulated to obtain the change patterns of saturation pressure and crude oil volume coefficient.

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 underground crude oil dissolved gas-oil ratio during the target oil reservoir's produced gas recycling and reinjection process, and to obtain a calculation formula for the carbon dioxide content during the target oil reservoir's produced gas recycling and reinjection process; a change law simulation module for simulating the change law of the crude oil dissolved gas-oil ratio and the carbon dioxide content under different ratios according to the calculation formula for the underground crude oil dissolved gas-oil ratio and the calculation formula for the carbon dioxide content; The variation law obtaining module is used to simulate the changes in the high-pressure physical properties of crude oil during the production gas recycling process, and obtain the variation laws of saturation pressure and crude oil volume coefficient; A crude oil high-pressure physical property map construction module is used to construct a crude oil high-pressure physical property map during the production gas recycling and reinjection process based on 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 the method for calculating the water-gas alternating flooding injection-production ratio 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 to 7 when executed.

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