Offshore oilfield gas injection development gas channeling well shut-in condition method and related equipment

Abstract

The invention discloses an offshore oilfield gas injection development gas channeling well shut-in condition method and related equipment, relates to the field of oilfield development, and mainly aims to solve the problem that determination of gas channeling well shut-in conditions depends too much on manpower. The method comprises the following steps: constructing an oil reservoir numerical simulation model; setting a predicted yield of a producing well based on the reservoir numerical simulation model; and based on the reservoir numerical simulation model and the predicted yield of the oil producing well, gas-channeling well shut-in production gas-oil ratio sensitivity is analyzed to determine the optimal gas-channeling well shut-in production gas-oil ratio, and the optimal gas-channeling well shut-in production gas-oil ratio is used for determining the gas-channeling well shut-in conditions. The method is used for the offshore oilfield gas injection development gas channeling well shut-in condition process.

Description

Technical Field

[0001] The invention relates to the field of oilfield development, and in particular to a method for shutting in gas channeling conditions during gas injection development of offshore oilfields and related equipment. Background Art

[0002] In the process of gas injection development, gas channeling is a common and non-negligible problem. There are many factors that affect gas channeling, such as reservoir heterogeneity, the presence of fractures, displacement velocity and well pattern, which will affect the time and degree of gas channeling. As the displacement velocity increases, the gas drive front reaches the production well earlier. Reservoir heterogeneity and the presence of fractures have the most significant impact on gas channeling. When the reservoir heterogeneity is strong, the injected gas advances along the high permeability zone and reaches the production well too early, while other areas are difficult to be affected; fractures have high conductivity, especially in carbonate reservoirs, where fractures are the main flow channels. The injected gas easily penetrates along the fractures to reach the production well, resulting in large amounts of gas production in the production well.

[0003] At present, there have been many studies on the influencing factors, determination methods and anti-gas channeling technologies of gas channeling. However, the gas channeling shut-in conditions of oil wells in gas injection development oil fields are usually determined based on the on-site production experience of the oil fields, lacking theoretical basis. At the same time, the existing gas channeling shut-in conditions of oil wells obtained based on on-site production experience of onshore oil fields are not necessarily applicable to offshore oil field gas injection development. Summary of the invention

[0004] In view of the above problems, the present invention provides a method and related equipment for shutting-in conditions for gas crossflow in offshore oilfield gas injection development, the main purpose of which is to solve the problem that the determination of shut-in conditions for gas crossflow is too dependent on manual work.

[0005] In order to solve at least one of the above technical problems, in a first aspect, the present invention provides a method for shutting in gas channeling during gas injection development in an offshore oil field, the method comprising:

[0006] Constructing numerical simulation models of oil reservoirs;

[0007] Setting the expected production of the oil well based on the above reservoir numerical simulation model;

[0008] Based on the above-mentioned reservoir numerical simulation model and the expected production of the above-mentioned oil production wells, the sensitivity of the gas-oil ratio of gas breakthrough well shut-in production is analyzed to determine the optimal gas-oil ratio of gas breakthrough well shut-in production, wherein the above-mentioned optimal gas-oil ratio of gas breakthrough well shut-in production is used to determine the above-mentioned gas breakthrough well shut-in conditions.

[0009] Optionally, the above-mentioned reservoir numerical simulation model is constructed based on the gas injection capacity parameters of the gas injection compressor, the processing capacity parameters of the natural gas processing plant, and the natural gas and crude oil pipeline transportation capacity parameters between the artificial islands.

[0010] Optionally, setting the predicted production of the oil production well based on the above reservoir numerical simulation model includes:

[0011] Setting the predicted production of the oil production well based on the target production of the oilfield and the regulation coefficient of the predicted production of the oil production well in the above reservoir numerical simulation model.

[0012] Optionally, setting the predicted production of the oil production well based on the target production of the oilfield and the regulation coefficient of the predicted production of the oil production well in the above reservoir numerical simulation model includes:

[0013] Setting the predicted production of the above oil production well based on the following formula:

[0014]

[0015] In the above formula, Q 0i is the predicted production of the i-th oil production well; Q total is the target production of the above oilfield; n is the number of oil production wells; α i is the regulation coefficient of the predicted production of the i-th oil production well.

[0016] Optionally, the above method further includes:

[0017] Determining the regulation coefficient of the predicted production of the above oil production well based on the following formula:

[0018]

[0019] In the above formula, Q pi is the productivity of the i-th oil production well; GOR i is the production gas-oil ratio of the i-th oil production well; GOR shutoff is the shut-in production gas-oil ratio for gas channeling of the oil production well.

[0020] Optionally, analyzing the sensitivity of the shut-in production gas-oil ratio for gas channeling based on the above reservoir numerical simulation model and the predicted production of the above oil production well to determine the optimal shut-in production gas-oil ratio for gas channeling includes:

[0021] Determining the sensitivity of the shut-in production gas-oil ratio for gas channeling based on the above reservoir numerical simulation model and the regulation coefficient of the predicted production of the above oil production well;

[0022] Determining the optimal shut-in production gas-oil ratio for gas channeling based on the relationship curve between the sensitivity of the shut-in production gas-oil ratio for gas channeling and the objective function.

[0023] Optionally, the above objective function is determined based on the cumulative oil production of the oilfield and / or the oil recovery factor of the oilfield.

[0024] In a second aspect, an embodiment of the present invention further provides a device for the shut-in condition of gas channeling in the gas injection development of an offshore oilfield, including:

[0025] A building unit for building a reservoir numerical simulation model;

[0026] A setting unit for setting the predicted production of a production well based on the above reservoir numerical simulation model;

[0027] An analysis unit for analyzing the sensitivity of the gas-oil ratio during gas breakthrough shut-in production based on the above reservoir numerical simulation model and the predicted production of the above production well to determine the optimal gas-oil ratio during gas breakthrough shut-in production, wherein the above optimal gas-oil ratio during gas breakthrough shut-in production is used to determine the above gas breakthrough shut-in conditions.

[0028] To achieve the above object, according to the third aspect of the present invention, there is provided a computer-readable storage medium, and the above computer-readable storage medium includes a stored program, wherein when the above program is executed by a processor, the steps of the above method for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield are implemented.

[0029] To achieve the above object, according to the fourth aspect of the present invention, there is provided an electronic device, including at least one processor and at least one memory connected to the above processor; wherein the above processor is used to call program instructions in the above memory to execute the steps of the above method for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield.

[0030] By means of the above technical solution, for the problem that the determination of gas breakthrough shut-in conditions in the method for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield provided by the present invention relies too much on manual work, the present invention builds a reservoir numerical simulation model; sets the predicted production of a production well based on the above reservoir numerical simulation model; analyzes the sensitivity of the gas-oil ratio during gas breakthrough shut-in production based on the above reservoir numerical simulation model and the predicted production of the above production well to determine the optimal gas-oil ratio during gas breakthrough shut-in production, wherein the above optimal gas-oil ratio during gas breakthrough shut-in production is used to determine the above gas breakthrough shut-in conditions. In the above solution, an integrated onshore and offshore reservoir numerical simulation model of an offshore oilfield is established, and the operating parameters of surface facilities and the regulation coefficient of the predicted production of production wells are set in the model. Based on this, a sensitivity analysis of the gas-oil ratio during gas breakthrough shut-in production is carried out, and finally the optimal gas-oil ratio during gas breakthrough shut-in production is determined, providing technical support for the efficient gas injection development of offshore oilfields.

[0031] Correspondingly, the device, equipment and computer-readable storage medium for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield provided by the embodiments of the present invention also have the above technical effects.

[0032] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are hereinafter specifically exemplified. Description of the Drawings

[0033] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0034] Figure 1 A schematic flow chart of a method for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield provided by an embodiment of the present invention is shown;

[0035] Figure 2 A schematic layout diagram of surface facilities of a certain offshore oilfield provided by an embodiment of the present invention is shown;

[0036] Figure 3 A schematic diagram of an integrated onshore and offshore reservoir numerical simulation model of a certain offshore oilfield provided by an embodiment of the present invention is shown;

[0037] Figure 4 A curve graph showing the relationship between the oil recovery degree of an oilfield and the gas-oil ratio of production at gas breakthrough shut-in provided by an embodiment of the present invention is shown;

[0038] Figure 5 A schematic block diagram showing the composition of a device for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield provided by an embodiment of the present invention is shown;

[0039] Figure 6 A schematic block diagram showing the composition of an electronic device for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield provided by an embodiment of the present invention is shown. Detailed Embodiments

[0040] The exemplary embodiments of the present invention will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully communicated to those skilled in the art.

[0041] To solve the problem that the determination of gas breakthrough shut-in conditions relies too much on manual work, an embodiment of the present invention provides a method for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield, as Figure 1 shown, the method includes:

[0042] S101. Construct a reservoir numerical simulation model;

[0043] The above-mentioned step S101 also includes: the above-mentioned reservoir numerical simulation model, taking into account the capacity parameters of offshore and onshore facilities, is constructed based on the gas injection capacity parameters of the gas injection compressor, the processing capacity parameters of the natural gas processing plant, and the natural gas and crude oil pipeline transportation capacity parameters between the artificial islands.

[0044] For example, offshore oil fields are usually developed using artificial islands, which are connected by pipelines. The produced oil and gas are collected in the central artificial island and then transported to the onshore processing plant through pipelines for processing. Some artificial islands are equipped with gas injection compressors for gas injection. Since ground facilities will affect the development of offshore oil fields, it is first necessary to establish an integrated above-ground and underground reservoir numerical simulation model of the target oil reservoir, and set the gas injection capacity of the gas injection compressor, the processing capacity of the natural gas processing plant, and the natural gas and crude oil pipeline transportation capacity between the artificial islands in the model.

[0045] S102, setting the estimated production of the oil well based on the above reservoir numerical simulation model;

[0046] The above step S102 further includes S1021:

[0047] S1021. In the above reservoir numerical simulation model, the estimated production of the oil production well is set based on the target production of the oil field and the control coefficient of the estimated production of the oil production well.

[0048] The above step S1021 also includes S10211 and S10212:

[0049] S10211. Set the estimated production of the above oil production well based on the following formula:

[0050]

[0051] The above formula, Q 0i is the expected production of the i-th oil well; Q total is the target production of the above oil field; n is the number of oil wells; α i is the control coefficient of the expected production of the i-th oil well.

[0052] For example, when the gas-to-oil ratio of an oil well increases, it is necessary to limit its production to prevent gas channeling. To this end, the expected production of the offshore oil field oil wells can be regulated according to the target production of the oil field and the production capacity and gas-to-oil ratio of each oil well. The expected production of each oil well can be regulated as follows:

[0053]

[0054] Where: Q 0i is the actual production of the i-th oil well, m 3 / d;Q total is the target production of the oil field, m3 / d; n is the number of oil wells, unit: well; α i is the predicted production regulation coefficient of the i-th oil well, dimensionless.

[0055] S10212. Determine the regulation coefficient of the predicted production of the above oil production well based on the following formula:

[0056]

[0057] In the above formula, Q pi is the productivity of the i-th oil production well; GOR i is the produced gas-oil ratio of the i-th oil production well; GOR shutoff is the produced gas-oil ratio at which gas channeling shuts in the oil production well.

[0058] Exemplarily, the oil well production regulation coefficient (α i ) is affected by the productivity and the produced gas-oil ratio of the oil well. When the produced gas-oil ratio of the oil well exceeds the produced gas-oil ratio at which gas channeling shuts in (GOR shutoff ), due to xx, the oil well shuts in, and α i is 0; when the produced gas-oil ratio of the oil well is less than the produced gas-oil ratio at which gas channeling shuts in (GOR shutoff ), α i decreases as the produced gas-oil ratio increases. Therefore, α i can be expressed as:

[0059]

[0060] In the formula: Q pi is the productivity of the i-th oil well, m 3 / d; GOR i is the produced gas-oil ratio of the i-th oil well, m 3 / m 3 ; GOR shutoff is the produced gas-oil ratio at which gas channeling shuts in the oil well, m 3 / m 3 .

[0061] S103. Analyze the sensitivity of the produced gas-oil ratio at which gas channeling shuts in based on the above reservoir numerical simulation model and the predicted production of the above oil production well to determine the optimal produced gas-oil ratio at which gas channeling shuts in, where the above optimal produced gas-oil ratio at which gas channeling shuts in is used to determine the above gas channeling shut-in condition.

[0062] The steps of the above S103 further include S1031:

[0063] S1031. Determine the sensitivity of the gas-oil ratio during gas channeling shut-in production based on the above reservoir numerical simulation model and the regulation coefficient of the expected production of the above oil production well; determine the optimal gas-oil ratio during gas channeling shut-in production based on the relationship curve between the sensitivity of the gas-oil ratio during gas channeling shut-in production and the objective function. The above objective function is determined based on the cumulative oil production of the oilfield and / or the recovery factor of the oilfield.

[0064] Exemplarily, during the gas injection development process of an oilfield, as the injected gas is continuously injected, the injected gas will advance towards the oil production well, resulting in a gradual increase in the gas-oil ratio of the oil production well. When the gas-oil ratio of the oil production well increases to a certain extent, the oil production well needs to be shut down. If the gas-oil ratio (GOR shutoff ) during gas channeling shut-in production is set too small, the oil production well will be shut down soon after the breakthrough of the injected gas, affecting the production time and cumulative oil production of the oil production well; if the gas-oil ratio (GOR shutoff ) during gas channeling shut-in production is set too large, the oil production well will still be in production for a long time after the breakthrough of the injected gas, resulting in ineffective cyclic gas injection. Therefore, there is an optimal gas-oil ratio during gas channeling shut-in production. In the embodiments of the present invention, the gas-oil ratio (GOR shutoff ) during gas channeling shut-in production is respectively set to 2 times, 3 times, 5 times, 8 times, 10 times, 15 times, and 20 times of the original gas-oil ratio. The cumulative oil production or recovery factor of the oilfield is selected as the objective function. Based on the established reservoir numerical simulation model, a sensitivity analysis of the gas-oil ratio during gas channeling shut-in production is carried out to obtain the relationship curve between the gas-oil ratio (GOR shutoff ) during gas channeling shut-in production and the cumulative oil production or recovery factor. Finally, the gas-oil ratio during gas channeling shut-in production when the cumulative oil production is the largest is determined as the optimal gas-oil ratio during gas channeling shut-in production.

[0065] By means of the above technical solution, for the problem that the method for determining the gas channeling shut-in conditions provided by the present invention for gas injection development in offshore oilfields relies too much on manual work, the present invention constructs a reservoir numerical simulation model; sets the expected production of the oil production well based on the above reservoir numerical simulation model; analyzes the sensitivity of the gas-oil ratio during gas channeling shut-in production based on the above reservoir numerical simulation model and the expected production of the above oil production well to determine the optimal gas-oil ratio during gas channeling shut-in production, wherein the above optimal gas-oil ratio during gas channeling shut-in production is used to determine the above gas channeling shut-in conditions. In the above solution, an integrated onshore and offshore reservoir numerical simulation model of an offshore oilfield is established, and the operating parameters of surface facilities and the regulation coefficient of the expected production of the oil production well are set in the model. Based on this, a sensitivity analysis of the gas-oil ratio during gas channeling shut-in production is carried out, and finally the optimal gas-oil ratio during gas channeling shut-in production is determined, providing technical support for the efficient gas injection development of offshore oilfields.

[0066] Furthermore, the following shows a specific embodiment of a method for determining gas channeling shut-in conditions for gas injection development in offshore oilfields:

[0067] An offshore oilfield implements gas injection development. There are a total of 5 artificial islands (Island D1, Island D2, Island D3, Island D4, and Island D5) in this offshore oilfield. Island D1 is the central artificial island, on which there are 2 gas injection compressors, 6 gas injection wells, and 4 oil production wells. Island D2, Island D3, Island D4, and Island D5 each have 8 oil production wells. The oil and gas produced by the oil production wells on Island D2, Island D3, Island D4, and Island D5 are transported through pipelines to converge on Island D1, and then, together with the oil and gas produced by the oil production wells on Island D1, they are transported through pipelines to an onshore processing plant for treatment. On Island D1, associated gas reinjection is implemented on 6 gas injection wells through 2 gas injection compressors. The layout of the surface facilities of this offshore oilfield is as Figure 1 shown. The pipeline transportation capacities between Island D2, Island D3, Island D4, and Island D5 and the central artificial island (Island D1), the pipeline transportation capacity from the central artificial island (Island D1) to the onshore processing plant, and the gas injection capacities of the 2 gas injection compressors on the central artificial island (Island D1) are shown in Table 1.

[0068] First, establish an integrated reservoir numerical simulation model for the above-ground and underground of this offshore oilfield (as Figure 3 shown). Set the gas injection capacity of the gas injection compressors, the treatment capacity of the natural gas treatment plant, and the gas and crude oil pipeline transportation capacities between each artificial island in the established numerical simulation model according to the operating parameters of the surface facilities shown in Table 1.

[0069] Table 1 Operating Parameter Table of Surface Facilities

[0070] Parameter Value Pipeline transportation capacity from Island D2 to Island D1 140mmscf / d Pipeline transportation capacity from Island D3 to Island D1 150mmscf / d Pipeline transportation capacity from Island D4 to Island D1 150mmscf / d Pipeline transportation capacity from Island D5 to Island D1 130mmscf / d Pipeline transportation capacity from Island D1 to onshore processing facility 500mmscf / d Gas injection capacity of 2 gas injection compressors 450mmscf / d

[0071] Second, set the regulation coefficient of the oil production wells in the established reservoir numerical simulation model according to Formula (1) and Formula (2). Finally, since the original gas-oil ratio of this oilfield is 600 m³ / m³, set the gas breakthrough shut-in production gas-oil ratio (GOR shutoff ) in the established reservoir numerical simulation model to 1200 m³ / m³, 1800 m³ / m³, 3000 m³ / m³, 4800 m³ / m³, 6000 m³ / m³, 9000 m³ / m³, 12000 m³ / m³ respectively, and conduct a sensitivity analysis of the gas breakthrough shut-in production gas-oil ratio (GOR

[0072] ) with the oil recovery of the oilfield as the objective function, and obtain the relationship curve between the gas breakthrough shut-in production gas-oil ratio (GOR shutoff ) and the oil recovery of the oilfield, as Figure 3 shown. It can be seen from Figure 3 that the oil recovery first increases and then decreases with the increase of the shut-in production gas-oil ratio (GOR shutoff ). This is because when the gas breakthrough shut-in production gas-oil ratio (GOR shutoff ) is less than 3000 m³ / m³ 3 / m³ 3 , with the increase of the gas breakthrough shut-in production gas-oil ratio (GOR shutoff) As the increase of shutoff ), the backpressure of D1 island is smaller, and the gas injection volume is larger, resulting in an increase in the recovery factor; when the gas channeling shut-in production gas-oil ratio (GOR 3 / m 3 ) is greater than 3000m shutoff ), with the increase of the gas channeling shut-in production gas-oil ratio (GOR 3 / m 3 ), the more ineffective cyclic gas injection, resulting in a decrease in the recovery factor instead. Therefore, the optimal gas channeling shut-in production gas-oil ratio for the oil production wells in this offshore oilfield is 3000m

[0073] . Further, as an implementation of the method shown above Figure 1 , the embodiment of the present invention also provides a device for gas channeling shut-in conditions in gas injection development of an offshore oilfield, which is used to implement the method shown above Figure 1 . The device embodiment corresponds to the foregoing method embodiment. For the convenience of reading, the details in the foregoing method embodiment will not be described one by one in this device embodiment. However, it should be clear that the device in this embodiment can correspondingly implement all the contents in the foregoing method embodiment. As Figure 5 shown, the device includes: a construction unit 21, a setting unit 22, and an analysis unit 23, where

[0074] The construction unit 21 is used to construct a reservoir numerical simulation model;

[0075] The setting unit 22 is used to set the expected production of the oil production well based on the above reservoir numerical simulation model;

[0076] The analysis unit 23 is used to analyze the sensitivity of the gas channeling shut-in production gas-oil ratio based on the above reservoir numerical simulation model and the expected production of the above oil production well to determine the optimal gas channeling shut-in production gas-oil ratio, where the above optimal gas channeling shut-in production gas-oil ratio is used to determine the above gas channeling shut-in conditions.

[0077] The processor contains a kernel, and the kernel retrieves the corresponding program unit from the memory. One or more kernels can be set, and by adjusting the kernel parameters, a method for gas channeling shut-in conditions in gas injection development of an offshore oilfield can be realized, which can solve the problem that the determination of gas channeling shut-in conditions depends too much on manual work.

[0078] The embodiment of the present invention provides a computer-readable storage medium, and the above computer-readable storage medium includes a stored program, and when the program is executed by a processor, the above method for gas channeling shut-in conditions in gas injection development of an offshore oilfield is realized.

[0079] The embodiment of the present invention provides a processor, and the above processor is used to run a program, where when the above program runs, the above method for gas channeling shut-in conditions in gas injection development of an offshore oilfield is executed.

[0080] An embodiment of the present invention provides an electronic device, which includes at least one processor and at least one memory connected to the processor; wherein, the processor is configured to call program instructions in the memory to execute the method for gas channeling shut-in conditions in offshore oilfield gas injection development as described above.

[0081] An embodiment of the present invention provides an electronic device 30, as Figure 6 shown, the electronic device includes at least one processor 301, at least one memory 302 connected to the processor, and a bus 303; wherein, the processor 301 and the memory 302 complete mutual communication through the bus 303; the processor 301 is configured to call program instructions in the memory to execute the method for gas channeling shut-in conditions in offshore oilfield gas injection development as described above.

[0082] The intelligent electronic device herein may be a PC, PAD, mobile phone, etc.

[0083] The present application also provides a computer program product, which is suitable for executing a program initialized with the steps of the method for gas channeling shut-in conditions in offshore oilfield gas injection development when executed on a process management electronic device.

[0084] It should be noted that in the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0085] Those skilled in the art should understand that the embodiments of the present application may be provided as a method, a system, or a computer program product. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0086] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0087] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction device that implements the functions specified in one or more of the acts Figure 1 acts or multiple acts and / or blocks Figure 1 blocks or multiple blocks.

[0088] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operational steps are performed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more of the acts Figure 1 acts or multiple acts and / or blocks Figure 1 blocks or multiple blocks.

[0089] Embodiments of the present application also provide a computer program product that includes computer software instructions that, when run on a processing device, cause the processing device to execute a process such as Figure 1 the process of controlling the memory in the corresponding embodiment.

[0090] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, they produce, in whole or in part, a process or function in accordance with an embodiment of the present application. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (such as coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, or magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

[0091] Those skilled in the art can clearly understand that, for the sake of convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0092] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms.

[0093] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0094] In addition, each functional unit in various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0095] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0096] The above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A method for determining the gas breakthrough shut-in conditions in gas injection development of offshore oilfields, characterized in that Including: Constructing a reservoir numerical simulation model; Setting the expected production of production wells based on the reservoir numerical simulation model; Analyzing the sensitivity of the gas-oil ratio during gas breakthrough shut-in production based on the reservoir numerical simulation model and the expected production of production wells to determine the optimal gas-oil ratio during gas breakthrough shut-in production, where the optimal gas-oil ratio during gas breakthrough shut-in production is used to determine the gas breakthrough shut-in conditions.

2. The method according to claim 1, wherein The reservoir numerical simulation model is constructed based on the gas injection capacity parameters of the gas injection compressor, the processing capacity parameters of the natural gas treatment plant, and the gas and crude oil pipeline transportation capacity parameters between artificial islands.

3. The method according to claim 2, wherein The setting of the expected production of production wells based on the reservoir numerical simulation model includes: Setting the expected production of production wells in the reservoir numerical simulation model based on the target production of the oilfield and the adjustment coefficient of the expected production of production wells.

4. The method according to claim 3, wherein The setting of the expected production of production wells in the reservoir numerical simulation model based on the target production of the oilfield and the adjustment coefficient of the expected production of production wells includes: Setting the expected production of the production well based on the following formula: In the above formula, Q 0i is the predicted production of the i-th oil production well; Q total is the target production of the oilfield; n is the number of oil production wells; α i is the regulation coefficient of the predicted production of the i-th oil production well.

5. The method according to claim 4, characterized in that Also including: Determining the adjustment coefficient of the expected production of the production well based on the following formula: In the above formula, Q pi is the productivity of the i-th oil production well; GOR i is the produced gas-oil ratio of the i-th oil production well; GOR shutoff is the gas breakthrough shut-in produced gas-oil ratio of the oil production well.

6. The method according to claim 1, wherein The analysis of the sensitivity of the gas-oil ratio during gas breakthrough shut-in production based on the reservoir numerical simulation model and the expected production of production wells to determine the optimal gas-oil ratio during gas breakthrough shut-in production includes: Determining the sensitivity of the gas-oil ratio during gas breakthrough shut-in production based on the reservoir numerical simulation model and the adjustment coefficient of the expected production of production wells; Determining the optimal gas-oil ratio during gas breakthrough shut-in production based on the relationship curve between the sensitivity of the gas-oil ratio during gas breakthrough shut-in production and the objective function.

7. The method according to claim 6, characterized in that The objective function is determined based on the cumulative oil production of the oilfield and / or the recovery factor of the oilfield.

8. An apparatus for determining the gas breakthrough shut-in condition in the gas injection development of an offshore oilfield, characterized in that, Including: A construction unit for constructing a reservoir numerical simulation model; A setting unit for setting the expected production of production wells based on the reservoir numerical simulation model; An analysis unit for analyzing the sensitivity of the gas-oil ratio during gas breakthrough shut-in production based on the reservoir numerical simulation model and the expected production of production wells to determine the optimal gas-oil ratio during gas breakthrough shut-in production, where the optimal gas-oil ratio during gas breakthrough shut-in production is used to determine the gas breakthrough shut-in conditions.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, where when the program is executed by a processor, it implements the method for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory connected to the processor; where the processor is used to call the program instructions in the memory and execute the method for determining gas breakthrough shut-in conditions in gas injection development of an offshore oilfield as described in any one of claims 1 to 8.

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