Method and device for determining reasonable injection-production ratio, electronic equipment and storage medium

Abstract

The invention discloses a method and device for determining a reasonable injection-production ratio, electronic equipment and a storage medium. The method comprises the steps of obtaining oil reservoir geological parameters of a research area; determining the relationship between the dissolved gas-oil ratio and the saturation pressure along with the recovery degree; according to the oil reservoir geological parameters and the parameters of the floating type production oil storage and drainage platform, a component fractional model of output gas circulation reinjection is constructed; the allocation quantity and the injection allocation quantity of the development well are determined; according to the relation between the allocation quantity, the injection allocation quantity, the dissolved gas-oil ratio and the saturation pressure along with the recovery degree, the water-gas alternate development effect under different accumulative injection-production ratio conditions under the output gas reinjection condition is simulated on the basis of a component fractional-mode model; and according to the water-gas alternate development effect, an optimal injection-production ratio chart under the conditions of different initial ground saturation pressure differences, initial dissolved gas-oil ratios and output gas reinjection ratios is established. According to the technical scheme, the reasonable injection-production ratio of water-gas alternating flooding of the deepwater oil field in the output gas circulation reinjection mode can be determined, and therefore efficient development of water-gas alternating miscible flooding can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development, and in particular to a method, a device, an electronic device and a storage medium for determining a reasonable injection-production ratio. Background Art

[0002] Since deepwater thick carbonate reservoirs have a high dissolved gas-oil ratio and a high content of CO2 (carbon dioxide) in the produced gas, and the deepwater oil fields are far away from the land, the produced gas cannot be exported. 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.

[0003] With the continuous development of the oil field, this kind of produced gas reinjection causes the underground crude oil dissolved gas-oil ratio to gradually increase, the CO2 content in the dissolved gas to gradually increase, and then the reservoir saturation pressure to gradually increase. In order to maintain water-gas alternating miscible drive, the formation pressure needs to be kept above the bubble point pressure of the reservoir, and in order to take into account the injection capacity of water-gas alternating drive, the formation pressure should not be too high. The injection-production ratio is a key parameter affecting the formation pressure. In order to improve the development effect of water-gas alternating drive, it is necessary to determine a reasonable injection-production ratio so that the formation pressure remains within a reasonable range.

[0004] In order to evaluate the development effect of water-gas alternating flooding in this type of oil reservoir and grasp the injection-production balance relationship in real time, it is necessary to establish a method to determine the reasonable injection-production ratio of water-gas alternating flooding in deepwater oilfields under the produced gas circulation reinjection mode. Summary of the invention

[0005] The present invention provides a method, device, electronic equipment and storage medium for determining a reasonable injection-production ratio, which can determine a reasonable injection-production ratio for water-gas alternating drive in a deepwater oilfield under a produced gas circulation reinjection mode, thereby realizing efficient development of water-gas alternating miscible drive.

[0006] According to one aspect of the present invention, a method for determining a reasonable injection-production ratio is provided, the method comprising:

[0007] Obtain reservoir geological parameters in the study area;

[0008] According to the predetermined gas consumption and external gas transmission conditions of the floating production storage and drainage platform, the relationship between the dissolved gas-oil ratio and the saturation pressure and the degree of production is determined;

[0009] According to the reservoir geological parameters and the floating production storage and drainage platform parameters, a component multi-mode model for the circulation and reinjection of produced gas is constructed;

[0010] Determine the production and injection rates of development wells;

[0011] According to the relationship between the allocated production, allocated injection volume, dissolved gas-oil ratio and saturation pressure and the degree of production, the water-gas alternating development effect under different cumulative injection-production ratio conditions under the produced gas reinjection condition is simulated based on the component multi-simulation model;

[0012] According to the water-gas alternating development effect, an optimal injection-production ratio chart is established under different initial geosaturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios, and a reasonable injection-production ratio is determined based on the optimal injection-production ratio chart.

[0013] According to another aspect of the present invention, there is provided a device for determining a reasonable injection-production ratio, the device comprising:

[0014] Reservoir geological parameter acquisition module, used to obtain reservoir geological parameters in the study area;

[0015] A recovery degree relationship determination module is used to determine the relationship between the dissolved gas-oil ratio and the saturation pressure and the recovery degree according to the predetermined self-use gas and external gas conditions of the floating production storage and drainage platform;

[0016] A component multi-model construction module is used to construct a component multi-model model for produced gas circulation reinjection according to the reservoir geological parameters and floating production storage and drainage platform parameters;

[0017] The module for determining the production allocation and injection allocation is used to determine the production allocation and injection allocation of the development well;

[0018] A water-gas alternating development effect simulation module is used to simulate the water-gas alternating development effects under different cumulative injection-production ratio conditions under the produced gas reinjection conditions based on the component multi-simulation model according to the relationship between the allocated production, the allocated injection volume, the dissolved gas-oil ratio and the saturation pressure with the degree of production;

[0019] The module for establishing the optimal injection-production ratio chart is used to establish the optimal injection-production ratio chart under different initial saturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios according to the water-gas alternating development effect, and determine a reasonable injection-production ratio based on the optimal injection-production ratio chart.

[0020] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0021] at least one processor; and

[0022] a memory communicatively connected to the at least one processor; wherein,

[0023] 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 determining a reasonable injection-production ratio as described in any embodiment of the present invention.

[0024] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement a method for determining a reasonable injection-production ratio as described in any embodiment of the present invention when executed.

[0025] The technical solution of the embodiment of the present invention obtains the geological parameters of the reservoir in the study area, determines the relationship between the dissolved gas-oil ratio and the saturation pressure with the degree of production according to the predetermined self-use gas and external gas conditions of the floating production storage and drainage platform, and then constructs a component multi-model model for the circulation and reinjection of the produced gas according to the geological parameters of the reservoir and the parameters of the floating production storage and drainage platform. Determine the allocated production and injection volume of the development well; simulate the water-gas alternating development effect of different cumulative injection-production ratio conditions under the produced gas reinjection condition based on the component multi-model model according to the allocated production, injection volume, dissolved gas-oil ratio and saturation pressure with the degree of production, and establish the optimal injection-production ratio chart under different initial saturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios according to the water-gas alternating development effect, and determine the reasonable injection-production ratio based on the optimal injection-production ratio chart. This technical solution can determine the reasonable injection-production ratio of water-gas alternating drive in deepwater oilfields under the produced gas circulation and reinjection mode, thereby realizing the efficient development of water-gas alternating miscible drive.

[0026] 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

[0027] 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.

[0028] Figure 1 is a flow chart of a method for determining a reasonable injection-production ratio provided according to Embodiment 1 of the present invention;

[0029] Figure 2 This is the phase diagram of the initial development of Unit 3 of the C oil field provided in Example 1 of the present application;

[0030] Figure 3 This is the phase diagram of the end of development of Unit 3 of the C oil field provided in Example 1 of the present application;

[0031] Figure 4 It is the optimal cumulative injection-production ratio chart for different development stages provided in Example 1 of the present application;

[0032] Figure 5is a structural schematic diagram of a device for determining a reasonable injection-production ratio provided according to Embodiment 2 of the present invention;

[0033] Figure 6 It is a structural schematic diagram of an electronic device for implementing a method for determining a reasonable injection-production ratio according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] 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.

[0035] It should be noted that the terms "optimal" 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.

[0036] Embodiment 1

[0037] Figure 1 This is a flow chart of a method for determining a reasonable injection-production ratio according to the first embodiment of the present invention. This embodiment is applicable to the case of determining a reasonable injection-production ratio for water-gas alternating flooding in deepwater oil fields. The method can be executed by a device for determining a reasonable injection-production ratio. The device for determining a reasonable injection-production ratio can be implemented in the form of hardware and / or software. The device for determining a reasonable injection-production ratio can be configured in an electronic device. Figure 1 As shown, the method includes:

[0038] S110. Obtain reservoir geological parameters in the study area.

[0039] In this plan, the study area may refer to deep-water and thick carbonate reservoirs, where the deep-water and thick carbonate reservoirs are developed by water-gas alternating flooding.

[0040] In this embodiment, the geological parameters of the oil reservoir in the study area can be obtained through geological exploration technology.

[0041] Optionally, obtain reservoir geological parameters of the study area, including:

[0042] The reservoir geological parameters are determined based on the geological research results, development dynamic parameters and single well information in the study area; wherein the reservoir geological parameters include oil layer thickness, formation dip, porosity, permeability, original formation pressure, high-pressure physical properties of crude oil and injection-production well spacing.

[0043] In this scheme, the thickness of the oil layer generally refers to the thickness of the sandstone in a certain layer section of a certain well or the overall thickness of the oil layer group; the formation dip angle may refer to the angle between the downward direction of the maximum dip line of the rock layer and its projection line on the horizontal plane; the porosity refers to the ratio of the sum of the volumes of all pore spaces in a rock sample to the volume of the rock sample; the permeability may refer to the ability of the rock to allow fluid to pass through; the injection-production well spacing may refer to the distance between adjacent injection wells and production wells.

[0044] Among them, crude oil high pressure properties can refer to crude oil PTV properties, PVT usually stands for pressure, volume and temperature. 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 oil industry.

[0045] Specifically, geological research results, development dynamic parameters and single well information in the study area can be obtained through geological exploration technology, and reservoir geological parameters can be determined based on the geological research results, development dynamic parameters and single well information in the study area.

[0046] By obtaining the reservoir geological parameters in the study area, the reasonable injection-production ratio of water-gas alternating flooding in deepwater oilfields can be determined based on the reservoir geological parameters.

[0047] S120. Determine the relationship between dissolved gas-oil ratio and saturation pressure and the degree of production based on the predetermined conditions of self-consumption gas and external gas transmission of the floating production storage and leakage platform.

[0048] Among them, the Floating Production Storage and Offloading System (FPSO) is a large-scale offshore oil production base that separates oil and gas from the extracted oil, treats oily wastewater, generates power, provides heat, stores and transports crude oil products, and integrates personnel accommodation and production command systems.

[0049] In this embodiment, the dissolved gas-oil ratio and the component changes in the produced gas corresponding to different recovery degrees can be obtained according to the self-use gas and external gas conditions of the floating production storage and drainage platform, and the underground crude oil saturation pressure value can be calculated from the dissolved gas-oil ratio and the component content in the produced gas, and the relationship between the dissolved gas-oil ratio and the saturation pressure and the recovery degree can be established. Specifically, the relationship between the dissolved gas-oil ratio and the saturation pressure and the recovery degree can be determined according to the self-use gas and external gas conditions of the floating production storage and drainage platform of dozens of production units in three deepwater oil fields.

[0050] In this scheme, before determining the relationship between the dissolved gas-oil ratio and the saturation pressure with the degree of production, it is also necessary to determine the calculation formula of the dissolved gasoline ratio. Specifically, it is necessary to simulate the change law of the underground crude oil dissolved gasoline ratio during the produced gas reinjection process, so as to derive the calculation formula of the underground crude oil dissolved gasoline ratio during the produced gas reinjection process.

[0051] Furthermore, when the underground crude oil composition is constant, the dissolved gas-oil ratio of crude oil above the saturation pressure is equal, which 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 dissolved gas-oil ratio of underground crude oil increases. The law of carbon dioxide content change during the produced gas cycle reinjection process is derived and calculated.

[0052] The original total gas volume G in underground crude oil i for:

[0053] G i =OOIP*R si ;

[0054] OOIP is the original oil geological reserves, R si is the original solution gas-oil ratio.

[0055] The gas output G is:

[0056] G=N P *GOR;

[0057] Among them, N P is the cumulative oil production, and GOR is the gas-oil ratio.

[0058] Assume W CO2i is the original carbon dioxide content in the gas, then the original carbon dioxide volume V in the gas CO2i for:

[0059] V CO2i =G i *W CO2i ;

[0060] Assuming that the output gas reinjection ratio is A, the carbon dioxide content of the output gas after methane is separated for external transmission or self-use and then reinjected into the ground is W CO2for:

[0061]

[0062] Furthermore, PVTi (phase analysis software) was used to simulate the changes in the high-pressure physical properties of crude oil during the production gas reinjection process to obtain the saturation pressure and crude oil volume coefficient B o Specifically, a DL (multiple flash) experiment was set up in PVTi to simulate the changes in the high-pressure physical properties of crude oil during the production gas reinjection process. As the proportion of carbon dioxide in the crude oil components increases, the saturation pressure gradually increases, and the corresponding crude oil volume coefficient under the saturation pressure also increases.

[0063] In this embodiment, the variation law of crude oil dissolved gas-oil ratio under different ratios of external gas and self-used gas is simulated and calculated. Assuming that the output gas reinjection ratio is A, the crude oil dissolved gas-oil ratio R s for:

[0064]

[0065] The basic information table of deepwater oil fields is shown in Table 1. A, B, and D represent different deepwater oil fields. C and B represent different units of the same deepwater oil field.

[0066] Table 1

[0067]

[0068]

[0069] S130, constructing a component multi-mode model for produced gas circulation and reinjection according to the reservoir geological parameters and the floating production storage and drainage platform parameters.

[0070] In this scheme, since deepwater oil fields have requirements for reinjection of produced gas and deepwater oil and gas production needs to rely on floating production, storage and drainage platforms, the gas and liquid processing capacity of floating production, storage and drainage platforms is limited. Therefore, the component multi-simulation model of produced gas circulation reinjection needs to consider the reservoir geological parameters and floating production, storage and drainage platform parameters.

[0071] Specifically, reservoir geological parameters and floating production storage and drainage platform parameters may be input into a predetermined numerical model to construct a component multi-simulation model for produced gas recycling and reinjection.

[0072] Optionally, the floating production storage and drainage platform parameters include a floating production storage and drainage platform gas processing capacity limit, a floating production storage and drainage platform liquid processing capacity limit, a floating production storage and drainage platform oil processing capacity limit, and a pipeline external gas transmission volume.

[0073] Specifically, the thickness of the oil layer, the formation dip, the porosity, the permeability, the original formation pressure, the high-pressure physical properties, the injection-production well spacing, the gas processing capacity limitation of the floating production storage and drainage platform, the liquid processing capacity limitation of the floating production storage and drainage platform, the oil processing capacity limitation of the floating production storage and drainage platform, and the amount of gas transmitted outside the pipeline can be input into the numerical model to construct a component multi-simulation model of the produced gas circulation reinjection.

[0074] By constructing a component multi-simulation model for the recycling of produced gas, the water-gas alternating development effect under different cumulative injection-production ratios can be simulated based on the component multi-simulation model.

[0075] S140. Determine the production allocation and injection allocation of the development well.

[0076] In this embodiment, production and injection allocation may refer to the determination and allocation of the oil production of production wells and the water injection volume when developing an oil field by water injection.

[0077] In this scheme, deepwater oil fields are mostly developed with large well spacing and sparse well patterns due to the large variation in oil layer thickness and strong reservoir heterogeneity. The single well production is high and varies greatly. The production and injection volume of the development wells need to be determined based on the oil layer thickness, reservoir properties, and injection-production well spacing. The oil layer thickness is generally 100-400m.

[0078] Optionally, determine the production allocation for development wells, including:

[0079] The allocated production is calculated based on the oil layer thickness, recovery rate, permeability, difference between formation pressure and saturation pressure, volume coefficient, viscosity, injection and production well spacing, and production well diameter.

[0080] In this scheme, the degree of recovery refers to the ratio of the cumulative oil production of an oil field at a certain time to its geological reserves, which is used to reflect the recovery of the oil field reserves.

[0081] Among them, the injection-production well spacing refers to the distance between adjacent injection wells and production wells. The average injection-production well spacing can be obtained by taking the arithmetic average of all injection-production well spacings.

[0082] In this embodiment, the oil layer thickness, recovery degree, permeability, the difference between the formation pressure and the saturation pressure, the volume coefficient, the viscosity, the injection-production well spacing and the production well diameter can be combined and calculated to obtain the allocated production.

[0083] By calculating the allocated production, the water-gas alternating development effect under different cumulative injection-production ratio conditions can be simulated based on the allocated production, thereby solving the problem that the gas-oil ratio of underground crude oil and the CO2 content in the dissolved gas gradually increase due to the reinjection of produced gas from deepwater oil fields, which in turn leads to changes in the physical properties of the reservoir fluid and a gradual increase in the reservoir saturation pressure, which may cause the formation pressure to be lower than the bubble point pressure of the reservoir and affect the miscible effect of water-gas alternating drive.

[0084] Optionally, the allocated production is calculated based on the oil layer thickness, recovery degree, permeability, difference between formation pressure and saturation pressure, volume coefficient, viscosity, injection and production well spacing, and production well diameter, including:

[0085] The following formula is used to calculate the allocated production:

[0086]

[0087] Among them, Q p represents the allocated production, Re represents the degree of recovery, K represents the permeability, h represents the oil layer thickness, ΔP represents the difference between the formation pressure and the saturation pressure, and B o represents the volume coefficient, μ represents the viscosity, represents the average injection-production well spacing, r w Indicates the diameter of the production well.

[0088] By calculating the allocated production, the water-gas alternating development effect under different cumulative injection-production ratio conditions can be simulated based on the allocated production, so as to solve the problem that the gas-oil ratio of underground crude oil gradually increases due to the reinjection of produced gas from deepwater oil fields, and the CO2 content in the dissolved gas gradually increases, which in turn leads to changes in the physical properties of the reservoir fluid, and the reservoir saturation pressure gradually increases, which may cause the formation pressure to be lower than the reservoir bubble point pressure, affecting the miscible effect of water-gas alternating flooding.

[0089] Optionally, determine the injection rate for development wells, including:

[0090] The injection amount is determined according to the allocated production and the predetermined number of production wells and injection wells.

[0091] In this embodiment, the allocated production volume, the number of production wells and the number of injection wells may be combined to calculate the allocated injection volume.

[0092] By calculating the injection volume, the water-gas alternating development effect under different cumulative injection-production ratio conditions can be simulated based on the injection volume, so as to solve the problem that the underground crude oil dissolved gas-oil ratio gradually increases and the CO2 content in the dissolved gas gradually increases due to the reinjection of produced gas from deepwater oil fields, which in turn leads to changes in the physical properties of the reservoir fluid and a gradual increase in the reservoir saturation pressure, which may cause the formation pressure to be lower than the reservoir bubble point pressure and affect the miscible effect of water-gas alternating drive.

[0093] Optionally, determining the injection amount according to the allocated production and a predetermined number of production wells and injection wells includes:

[0094] The injection volume is calculated using the following formula:

[0095]

[0096] Among them, QI Indicates the injection volume, Q P represents the allocated output, N P Represents the number of production wells, N I Indicates the number of injection wells.

[0097] By calculating the injection volume, the water-gas alternating development effect under different cumulative injection-production ratio conditions can be simulated based on the injection volume, so as to solve the problem that the underground crude oil dissolved gas-oil ratio gradually increases and the CO2 content in the dissolved gas gradually increases due to the reinjection of produced gas from deepwater oil fields, which in turn leads to changes in the physical properties of the reservoir fluid and a gradual increase in the reservoir saturation pressure, which may cause the formation pressure to be lower than the reservoir bubble point pressure and affect the miscible effect of water-gas alternating drive.

[0098] S150. According to the relationship between the allocated production volume, allocated injection volume, dissolved gas-oil ratio and saturation pressure as a function of the degree of production, the water-gas alternating development effect under different cumulative injection-production ratios under the conditions of produced gas reinjection is simulated based on the component multi-simulation model.

[0099] In this scheme, the production system is set to simulate the conditions of produced gas reinjection, first reduce the pressure for production, and then improve the water-gas alternating development effect under different cumulative injection-production ratios under the formation pressure mode. Among them, the formation pressure is higher than the saturation pressure.

[0100] S160. According to the water-gas alternating development effect, establish an optimal injection-production ratio chart under different initial geosaturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios, and determine a reasonable injection-production ratio based on the optimal injection-production ratio chart.

[0101] In this scheme, the corresponding simulation results are obtained according to the reservoir geological parameters, floating production storage and drainage platform parameters and production system settings, and then the development effects are compared to establish the optimal injection-production ratio chart under different initial saturation pressure differences, initial dissolved gas-oil ratios and produced gas reinjection ratios.

[0102] In this embodiment, Figure 2 This is the phase diagram of the initial development of Unit 3 of the C oil field provided in Example 1 of the present application; Figure 3 This is the phase diagram of the C oil field 3 unit at the end of development provided in Example 1 of the present application, such as Figure 2 and Figure 3 As shown, the produced gas is recycled and the saturation pressure gradually increases, and the formation pressure needs to be increased to maintain the level. Figure 4 This is the optimal cumulative injection-production ratio chart for different development stages provided in Example 1 of this application. The four curves respectively represent the relationship between the cumulative injection-production ratio and the degree of recovery of oil fields A, B, C, and D. Figure 4 As shown, the water-gas alternating development effect under different cumulative injection-production ratios under the condition of produced gas reinjection can be simulated by first reducing the pressure for production and then increasing the formation pressure.

[0103] The technical solution of the embodiment of the present invention obtains the geological parameters of the oil reservoir in the study area, determines the relationship between the dissolved gas-oil ratio and the saturation pressure with the degree of production according to the predetermined self-use gas and external gas conditions of the floating production storage and drainage platform, and then constructs a component multi-model model for the circulation and reinjection of produced gas according to the geological parameters of the oil reservoir and the parameters of the floating production storage and drainage platform. Determine the allocated production and injection volume of the development well; according to the relationship between the allocated production, injection volume, dissolved gas-oil ratio and saturation pressure with the degree of production, simulate the water-gas alternating development effect of different cumulative injection-production ratio conditions under the produced gas reinjection condition based on the component multi-model model, and according to the water-gas alternating development effect, establish the optimal injection-production ratio chart under different initial saturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios, and determine the reasonable injection-production ratio based on the optimal injection-production ratio chart. By implementing this technical solution and establishing the optimal injection-production ratio chart under different initial saturation pressure difference, initial dissolved gas-oil ratio, and produced gas reinjection ratio, the reasonable injection-production ratio of water-gas alternating flooding in deepwater oilfields under the produced gas circulation reinjection mode can be determined, thereby realizing the efficient development of water-gas alternating miscible flooding, providing technical support for the development adjustment, production regulation, etc. of deepwater oilfields.

[0104] Embodiment 2

[0105] Figure 5 Schematic diagram of a device for determining a reasonable injection-production ratio according to Embodiment 2 of the present invention. Figure 5 As shown, the device comprises:

[0106] The reservoir geological parameter acquisition module 510 is used to acquire the reservoir geological parameters of the study area;

[0107] The recovery degree relationship determination module 520 is used to determine the relationship between the dissolved gas-oil ratio and the saturation pressure and the recovery degree according to the predetermined self-use gas and external gas conditions of the floating production storage and drainage platform;

[0108] A component multi-model construction module 530 is used to construct a component multi-model for produced gas circulation reinjection according to the reservoir geological parameters and floating production storage and drainage platform parameters;

[0109] The production allocation and injection allocation determination module 540 is used to determine the production allocation and injection allocation of the development well;

[0110] The water-gas alternating development effect simulation module 550 is used to simulate the water-gas alternating development effect under different cumulative injection-production ratio conditions under the produced gas reinjection condition based on the component multi-simulation model according to the relationship between the allocated production, the allocated injection volume, the dissolved gas-oil ratio and the saturation pressure with the degree of production;

[0111] The module 560 for establishing the optimal injection-production ratio chart is used to establish the optimal injection-production ratio chart under different initial geosaturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios according to the water-gas alternating development effect, and to determine a reasonable injection-production ratio based on the optimal injection-production ratio chart.

[0112] Optionally, the reservoir geological parameter acquisition module 510 is specifically used for:

[0113] The reservoir geological parameters are determined based on the geological research results, development dynamic parameters and single well information in the study area; wherein the reservoir geological parameters include oil layer thickness, formation dip, porosity, permeability, original formation pressure, high-pressure physical properties of crude oil and injection-production well spacing.

[0114] Optionally, the floating production storage and drainage platform parameters include a floating production storage and drainage platform gas processing capacity limit, a floating production storage and drainage platform liquid processing capacity limit, a floating production storage and drainage platform oil processing capacity limit, and a pipeline external gas transmission volume.

[0115] Optionally, the module 540 for determining the amount of production and injection includes:

[0116] The production allocation calculation submodule is used to calculate the production allocation based on the oil layer thickness, production degree, permeability, the difference between the formation pressure and the saturation pressure, volume coefficient, viscosity, injection and production well spacing, and production well diameter.

[0117] Optional, the yield calculation submodule is specifically used for:

[0118] The following formula is used to calculate the allocated production:

[0119]

[0120] Among them, Q p represents the allocated production, Re represents the degree of recovery, K represents the permeability, h represents the oil layer thickness, ΔP represents the difference between the formation pressure and the saturation pressure, and B o represents the volume coefficient, μ represents the viscosity, represents the average injection-production well spacing, r w Indicates the diameter of the production well.

[0121] Optionally, the module 540 for determining the amount of production and injection includes:

[0122] The injection volume calculation submodule is used to determine the injection volume according to the allocated production volume and the predetermined number of production wells and injection wells.

[0123] Optional, injection volume calculation submodule, specifically used for:

[0124] The injection volume is calculated using the following formula:

[0125]

[0126] Among them, Q I Indicates the injection volume, Q P represents the allocated output, N P Represents the number of production wells, N I Indicates the number of injection wells.

[0127] A device for determining a reasonable injection-production ratio provided by an embodiment of the present invention can execute a method for determining a reasonable injection-production ratio provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0128] Embodiment 3

[0129] Figure 6 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.

[0130] like Figure 6 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.

[0131] 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.

[0132] 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 determining a reasonable injection-production ratio.

[0133] In some embodiments, a method for determining a reasonable injection-production ratio may 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 may 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 determining a reasonable injection-production ratio described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute a method for determining a reasonable injection-production ratio in any other appropriate manner (e.g., by means of firmware).

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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).

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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 determining a reasonable injection-production ratio, characterized in that: include: Obtain reservoir geological parameters in the study area; According to the predetermined gas consumption and external gas transmission conditions of the floating production storage and drainage platform, the relationship between the dissolved gas-oil ratio and the saturation pressure and the degree of production is determined; According to the reservoir geological parameters and the floating production storage and drainage platform parameters, a component multi-mode model for the production gas circulation and injection is constructed; Determine the production and injection rates of development wells; According to the relationship between the allocated production, allocated injection volume, dissolved gas-oil ratio and saturation pressure and the degree of production, the water-gas alternating development effect under different cumulative injection-production ratio conditions under the produced gas reinjection condition is simulated based on the component multi-simulation model; According to the water-gas alternating development effect, an optimal injection-production ratio chart is established under different initial geosaturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios, and a reasonable injection-production ratio is determined based on the optimal injection-production ratio chart.

2. The method according to claim 1, characterized in that Obtain reservoir geological parameters in the study area, including: The reservoir geological parameters are determined based on the geological research results, development dynamic parameters and single well information in the study area; wherein the reservoir geological parameters include oil layer thickness, formation dip, porosity, permeability, original formation pressure, high-pressure physical properties of crude oil and injection-production well spacing.

3. The method according to claim 1, characterized in that The floating production storage and drainage platform parameters include the floating production storage and drainage platform gas processing capacity limit, the floating production storage and drainage platform liquid processing capacity limit, the floating production storage and drainage platform oil processing capacity limit and the pipeline external gas transmission volume.

4. The method according to claim 1, characterized in that Determine the production allocation for development wells, including: The allocated production is calculated based on the oil layer thickness, recovery rate, permeability, difference between formation pressure and saturation pressure, volume coefficient, viscosity, injection and production well spacing, and production well diameter.

5. The method according to claim 4, characterized in that The production allocation is calculated based on the oil layer thickness, recovery degree, permeability, difference between formation pressure and saturation pressure, volume coefficient, viscosity, injection and production well spacing, and production well diameter, including: The following formula is used to calculate the allocated yield; Among them, Q p represents the allocated production, Re represents the degree of recovery, K represents the permeability, h represents the oil layer thickness, ΔP represents the difference between the formation pressure and the saturation pressure, and B o represents the volume coefficient, μ represents the viscosity, d represents the average injection-production well spacing, r w Indicates the diameter of the production well.

6. The method according to claim 1, characterized in that Determine the injection rate for development wells, including: The injection amount is determined according to the allocated production and the predetermined number of production wells and injection wells.

7. The method according to claim 6, characterized in that Determining the injection amount according to the allocated production and the predetermined number of production wells and injection wells includes: The injection volume is calculated using the following formula: Among them, Q I Indicates the injection volume, Q P represents the allocated output, N P Represents the number of production wells, N I Indicates the number of injection wells.

8. A device for determining a reasonable injection-production ratio, characterized in that: include: Reservoir geological parameter acquisition module, used to obtain reservoir geological parameters in the study area; A recovery degree relationship determination module is used to determine the relationship between the dissolved gas-oil ratio and the saturation pressure and the recovery degree according to the predetermined self-use gas and external gas conditions of the floating production storage and drainage platform; A component multi-model construction module is used to construct a component multi-model model for produced gas circulation reinjection according to the reservoir geological parameters and floating production storage and drainage platform parameters; The module for determining the production allocation and injection allocation is used to determine the production allocation and injection allocation of the development well; A water-gas alternating development effect simulation module is used to simulate the water-gas alternating development effects under different cumulative injection-production ratio conditions under the produced gas reinjection conditions based on the component multi-simulation model according to the relationship between the allocated production, the allocated injection volume, the dissolved gas-oil ratio and the saturation pressure with the degree of production; The module for establishing the optimal injection-production ratio chart is used to establish the optimal injection-production ratio chart under different initial saturation pressure differences, initial dissolved gas-oil ratios, and produced gas reinjection ratios according to the water-gas alternating development effect, and determine a reasonable injection-production ratio based on the optimal injection-production ratio chart.

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 determining a reasonable injection-production ratio according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement a method for determining a reasonable injection-production ratio according to any one of claims 1 to 7 when executed.

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