Method, system, equipment and medium for calculating water invasion amount of fault control fracture-vuggy carbonate reservoir

Abstract

The invention provides a method, system, equipment and medium for calculating the water invasion amount of a fault-control fracture-vuggy carbonate reservoir, and the method comprises the steps: 1, calculating the water invasion amount of the fault-control fracture-vuggy carbonate reservoir according to the obtained oil well output volume of a stable production stage before water invasion, the formation pressure of the stable production stage before water invasion, the formation pressure during water invasion and the output volume after water invasion; calculating to obtain the theoretical liquid production capacity driven by the external water body after water invasion; 2, according to the obtained actual formation pressure after water invasion, the water body volume of formation pressure change caused by water invasion is obtained through calculation; 3, according to the obtained theoretical liquid production capacity driven by the external water body after water invasion and the water body volume of the formation pressure change caused by water invasion, the water invasion amount after water invasion is obtained through calculation; according to the method, the material balance equation is applied, only the fluid property and the pressure change of the fluid in the reservoir container are considered, and the use of parameters which are difficult to accurately obtain is avoided, so that the accuracy and credibility of a calculation result are relatively high.

Description

Technical Field

[0001] This invention belongs to the field of oilfield development, specifically relating to a method, system, equipment, and medium for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs. Background Technology

[0002] Currently, fault-controlled fractured-vuggy carbonate reservoirs commonly face the problem of bottom water coning. After bottom water breakthrough, production decreases by more than 80%, seriously affecting development. Current strategies for managing bottom water coning in fault-controlled fractured-vuggy carbonate reservoirs include:

[0003] First, adjust production parameters.

[0004] Reduce production pressure differential: Reduce water cone formation by lowering wellhead pressure or increasing pressure in oil or gas reservoirs.

[0005] Adjust the oil production rate: slow down the oil production rate to reduce the formation rate of the water cone.

[0006] Second, adjust downhole operations.

[0007] Sealing cracks: Use sealing agents or cement slurry to seal cracks at the bottom of the well to prevent water from seeping in.

[0008] Adjusting the well bottom structure: By adjusting the well bottom structure, such as adding a sand-proof layer or adjusting the well bottom angle, the formation of water cones can be reduced.

[0009] Third, chemical treatment

[0010] Use of chemical agents: Use chemical agents such as polymers and crosslinking agents to improve the permeability of oil or gas layers and reduce the formation of water cones.

[0011] Currently, determining the effectiveness of strategies for preventing bottom water coning in fault-controlled fracture-vuggy carbonate reservoirs requires calculating the water intrusion volume. Accurately calculating the water intrusion volume is a major challenge in bottom water coning control. Therefore, accurately calculating the water intrusion volume to guide the control of bottom water coning in fault-controlled fracture-vuggy carbonate reservoirs is worthy of further research.

[0012] While there are various methods for calculating water intrusion, each method has certain drawbacks and limitations, such as:

[0013] 1. Volumetric method

[0014] This method relies on accurate geological data, such as reservoir geometry, porosity, and permeability, which are often subject to uncertainty in practice, leading to inaccurate calculation results.

[0015] Second, the pressure reduction method

[0016] This method requires continuous downhole pressure monitoring data, but in actual operation, the monitoring data may be discontinuous or contain errors, or be affected by wellbore effects (such as wellbore storage effects), leading to inaccurate calculation results.

[0017] Third, the production method

[0018] Production monitoring data may be affected by a variety of factors, such as downhole equipment failure and operational errors, leading to inaccurate production data. Furthermore, this method does not take into account dynamic changes in the reservoir, such as the gradual decrease in reservoir pressure, which may result in overestimation of the calculated results.

[0019] Fourth, numerical simulation method

[0020] Numerical simulation requires the establishment of complex reservoir models, which not only requires a lot of time and computing resources, but also requires users to have high professional skills, resulting in high computing costs. Summary of the Invention

[0021] The purpose of this invention is to provide a method, system, equipment, and medium for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs, thereby solving the problem of inaccurate calculation results in existing water intrusion calculation methods.

[0022] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0023] This invention provides a method for calculating water intrusion in fault-controlled fracture-vuggy carbonate reservoirs, comprising the following steps:

[0024] Step 1: After preventing bottom water coning in fractured-vuggy carbonate reservoirs, the theoretical production volume driven by external water after water intrusion is calculated based on the well production volume during the stable production stage before water intrusion, the formation pressure during the stable production stage before water intrusion, the formation pressure during water intrusion, and the production volume after water intrusion.

[0025] Step 2: Based on the actual formation pressure obtained after water intrusion, calculate the volume of water body that causes the change in formation pressure after water intrusion.

[0026] Step 3: Based on the theoretical production volume driven by the external water body after water intrusion and the volume of water body causing changes in formation pressure after water intrusion, calculate the water intrusion volume of the fault-controlled fracture-vuggy carbonate reservoir after water intrusion.

[0027] Step 4: Compare the water intrusion volume after water intrusion in the fault-controlled fracture-vuggy carbonate reservoir with the water intrusion volume before bottom water coning prevention in the fault-controlled fracture-vuggy carbonate reservoir. If the water intrusion volume after prevention is less than the water intrusion volume before prevention, the original prevention strategy is used to prevent bottom water coning in the fault-controlled fracture-vuggy carbonate reservoir. If the water intrusion volume after prevention is greater than or equal to the water intrusion volume before prevention, the prevention strategy for bottom water coning in the fault-controlled fracture-vuggy carbonate reservoir is adjusted.

[0028] Preferably, in step 1, the theoretical liquid production driven by the external water body after water intrusion is calculated, specifically by:

[0029] S11. Based on the well production volume during the stable production stage before water invasion, the formation pressure during the stable production stage before water invasion, and the formation pressure during water invasion, the production volume per unit pressure drop before water invasion is calculated.

[0030] S12, based on the liquid production per unit pressure drop before water intrusion, calculate the theoretical liquid production driven by the original elastic energy after water intrusion.

[0031] S13. Based on the theoretical liquid production driven by the original elastic energy after water intrusion and the obtained production volume after water intrusion, the theoretical liquid production driven by the external water body after water intrusion is calculated.

[0032] Preferably, in S12, the theoretical liquid production driven by the original elastic energy after water intrusion is calculated, specifically by:

[0033] Obtain the formation pressure calculated based on the original production trend without water intrusion;

[0034] Using the formation pressure calculated based on the original production trend without water intrusion, and combined with the liquid production per unit pressure drop before water intrusion, the theoretical liquid production driven by the original elastic energy after water intrusion is calculated.

[0035] Preferably, the formation pressure is obtained by adjusting for the original production trend under the condition of no water intrusion. The specific method is as follows:

[0036] Plot a coordinate graph relating formation pressure to cumulative produced fluid volume;

[0037] On this coordinate graph, the straight line P1P2 between the formation pressure P1 during the stable production stage before water intrusion and the formation pressure P2 during water intrusion is extended to obtain the trend line of the straight line P1P2.

[0038] By substituting the cumulative produced liquid volume corresponding to the actual formation pressure P4 after water intrusion into the trend line, the formation pressure calculated according to the original production trend under the condition of no water intrusion is obtained.

[0039] Preferably, in S13, the theoretical liquid production driven by the external water body after water intrusion is calculated according to the following formula:

[0040] Q2 = N2 - Q1

[0041] Where N2 is the production volume of the target oil well after water intrusion; Q2 is the theoretical production volume driven by the external water body after water intrusion; and Q1 is the theoretical production volume driven by the original elastic energy after water intrusion.

[0042] Preferably, in step 2, the volume of water body causing the change in formation pressure after water intrusion is calculated according to the following formula:

[0043] W = J * (P4 - P3)

[0044] Where P4 is the actual formation pressure after water intrusion; W is the volume of water that causes the formation pressure change after water intrusion; J is the liquid production per unit pressure drop before water intrusion; and P3 is the formation pressure calculated based on the original production trend under the condition of no water intrusion.

[0045] A system for calculating water intrusion in fault-controlled fracture-vuggy carbonate reservoirs, comprising:

[0046] The theoretical production volume calculation unit after water invasion is used to calculate the theoretical production volume driven by external water after water invasion based on the well production volume during the stable production stage before water invasion, the formation pressure during the stable production stage before water invasion, the formation pressure during water invasion, and the production volume of the fault-controlled fractured-vuggy carbonate reservoir after water invasion.

[0047] The water volume calculation unit after water intrusion is used to calculate the water volume caused by the change in formation pressure after water intrusion, based on the actual formation pressure obtained after water intrusion.

[0048] The water intrusion calculation unit is used to calculate the water intrusion volume of fault-controlled fracture-vuggy carbonate reservoirs based on the theoretical production volume driven by the external water body after water intrusion and the volume of water body that causes changes in formation pressure after water intrusion.

[0049] A computer device, comprising:

[0050] A processor is used to execute computer programs;

[0051] A computer-readable storage medium storing a computer program that, when executed by the processor, performs the method.

[0052] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the method as described.

[0053] A computer program product comprising a computer program that, when executed by a processor, implements the method as described.

[0054] Compared with the prior art, the beneficial effects of the present invention are:

[0055] This invention provides a method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs. It utilizes the change in reservoir elastic yield caused by the additional energy replenishment brought by water intrusion to calculate the volume of water volume resulting in formation pressure changes after water intrusion. Simultaneously, the reservoir is considered as a whole. Before water intrusion, the reservoir is driven by the elastic energy generated by formation fluid compression. After water intrusion, the reservoir's driving mechanism changes to a mixture of the original elastic energy and the energy from the external water body. Therefore, by calculating the energy change brought by the external system, i.e., water intrusion, the increased water intrusion within the system can be calculated. This application uses a mass balance equation, considering only fluid properties and pressure changes within the reservoir container, avoiding the use of parameters that are difficult to obtain accurately. Therefore, the calculation results have high accuracy and reliability. Attached Figure Description

[0056] Figure 1 This is a schematic diagram illustrating the calculation of water intrusion volume according to an embodiment of the present invention;

[0057] In the figure, the vertical axis represents the formation pressure P of the calculation unit, which is usually obtained from formation pressure testing. The horizontal axis represents the cumulative produced fluid volume N of the calculation unit, which is usually obtained from surface measurement data. The figure shows the relationship curve between formation pressure and cumulative produced fluid volume before and after water intrusion in the oil well. In the figure, P1 represents the formation pressure that has stabilized after the wellbore and near-well pressure are released. P2 represents the formation pressure before the formation pressure change trend changes further, i.e., before water intrusion. P3 represents the theoretical pressure predicted further along the linear trend of P1P2 after water intrusion. P4 represents the actual formation pressure value after water intrusion. N1 represents the cumulative produced fluid volume before water intrusion. N2 represents the cumulative produced fluid volume after water intrusion. Detailed Implementation

[0058] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0059] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0060] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0061] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0062] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0063] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0064] Example 1

[0065] After preventing bottom water coning in fault-controlled fracture-vuggy carbonate reservoirs, the method for calculating water intrusion in fault-controlled fracture-vuggy carbonate reservoirs provided in this embodiment is used to calculate the water intrusion. If the water intrusion after prevention is less than the water intrusion before prevention, the original prevention strategy is used to prevent bottom water coning in fault-controlled fracture-vuggy carbonate reservoirs. If the water intrusion after prevention is greater than or equal to the water intrusion before prevention, the prevention strategy for bottom water coning in fault-controlled fracture-vuggy carbonate reservoirs is adjusted.

[0066] The principle behind calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs in this embodiment is:

[0067] The volume of water intrusion is calculated by utilizing the change in reservoir elastic yield caused by the additional energy replenishment brought about by water intrusion. The reservoir is considered as a whole. Before water intrusion, the reservoir is driven by the elastic energy generated by formation fluid compression. After water intrusion, the reservoir's driving mechanism changes to a mixture of the original elastic energy and the energy from the external water body. Therefore, by calculating the energy change brought about by the external system, i.e., water intrusion, the increased volume of water intrusion within the system can be calculated.

[0068] Fault-controlled carbonate reservoirs differ from clastic reservoirs in that their reservoirs are dominated by fractures and caverns. Logging instruments cannot obtain data from these fractures and caverns, making it impossible to acquire parameters such as porosity and permeability. Furthermore, these reservoirs are highly heterogeneous, making it difficult to accurately identify their contours using seismic data, thus hindering the development of accurate geological models. This application uses mass balance equations, considering only fluid properties and pressure changes within the reservoir container, avoiding the use of parameters that are difficult to obtain accurately. Therefore, the calculation results have high accuracy and reliability.

[0069] Specifically, the following steps are included:

[0070] Step 1, calculate the liquid production per unit pressure drop before water intrusion:

[0071] J = N1 / (P1-P2)

[0072] Where N1 is the well production volume during the stable production stage before water intrusion; P1 is the formation pressure during the stable production stage before water intrusion; and P2 is the formation pressure during water intrusion.

[0073] Step 2, calculate the theoretical liquid production driven by the original elastic energy after water intrusion:

[0074] Q1 = J*(P2 - P3)

[0075] P3 is the formation pressure calculated based on the original production trend without water intrusion.

[0076] The specific calculation method for the formation pressure P3 obtained by adjusting for the original production trend under the condition of no water intrusion is as follows:

[0077] Plot a coordinate graph relating formation pressure to cumulative produced fluid volume;

[0078] On this coordinate graph, the straight line P1P2 between the formation pressure P1 during the stable production stage before water intrusion and the formation pressure P2 during water intrusion is extended to obtain the trend line of the straight line P1P2.

[0079] By substituting the cumulative produced liquid volume corresponding to the actual formation pressure P4 after water intrusion into the trend line, we obtain the formation pressure P3 calculated according to the original production trend without water intrusion.

[0080] Step 3, calculate the theoretical liquid production driven by the external water body after water intrusion:

[0081] Q2 = N2 - Q1

[0082] Where N2 is the output volume after water intrusion.

[0083] Step 4: Calculate the volume of water body affected by the change in formation pressure after water intrusion.

[0084] W = J * (P4 - P3)

[0085] P4 represents the actual formation pressure after water intrusion.

[0086] Step 5, calculate the amount of water intrusion after flooding:

[0087] W e =Q2 / Bo + W / Bw

[0088] Where Bo is the crude oil volume factor; Bw is the formation water volume factor.

[0089] Example 2

[0090] Water intrusion was calculated for the Yueman 5 well in the Fuman oilfield, and a corresponding drainage and production test was conducted based on the calculation results. After nozzle enlargement, it was found that the formation pressure in the well changed from an upward trend to a stable trend, indicating that the current actual drainage rate of the well is comparable to the water intrusion rate. Calculations of the actual drainage rate showed that it was basically consistent with the results calculated using this technique, with a consistency rate exceeding 97%.

[0091] Example 3

[0092] This embodiment provides a system for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs, comprising:

[0093] The theoretical liquid production calculation unit after water intrusion is used to calculate the theoretical liquid production driven by the external water body after water intrusion. The specific method for calculating the theoretical liquid production driven by the external water body after water intrusion is as follows:

[0094] S11, calculate the liquid production per unit pressure drop before water intrusion;

[0095] S12, calculate the theoretical liquid production driven by the original elastic energy after water intrusion;

[0096] S13, calculate the theoretical liquid production driven by the external water body after water intrusion.

[0097] The water volume calculation unit after water intrusion is used to calculate the water volume caused by changes in formation pressure after water intrusion. The specific method for calculating the water volume caused by changes in formation pressure after water intrusion is as follows:

[0098] Obtain the actual formation pressure after water intrusion;

[0099] The volume of water body causing the change in formation pressure after water intrusion is calculated based on the actual formation pressure after water intrusion and the liquid production per unit pressure drop before water intrusion.

[0100] The post-water intrusion calculation unit is used to calculate the post-water intrusion volume of fault-controlled fracture-vuggy carbonate reservoirs.

[0101] Example 4

[0102] This embodiment 4 provides a computer device, including: a memory for storing a computer program; and a processor for executing the computer program to implement the steps of a computer method.

[0103] When the processor executes the computer program, it implements the steps of the above-described computer method. For example:

[0104] A method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs includes the following steps:

[0105] Step 1: Calculate the theoretical liquid production driven by the external water body after water intrusion;

[0106] Step 2: Calculate the volume of water body affected by the change in formation pressure after water intrusion;

[0107] Step 3: Calculate the water intrusion volume after water intrusion in fault-controlled fractured-vuggy carbonate reservoirs.

[0108] Alternatively, when the processor executes the computer program, it implements the functions of each module in the above system, such as including:

[0109] The theoretical liquid production calculation unit after water intrusion is used to calculate the theoretical liquid production driven by the external water body after water intrusion.

[0110] The water volume calculation unit after water intrusion is used to calculate the water volume caused by changes in formation pressure after water intrusion.

[0111] The post-water intrusion calculation unit is used to calculate the post-water intrusion volume of fault-controlled fracture-vuggy carbonate reservoirs.

[0112] The computer device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The computer device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the above are examples of computer devices and do not constitute a limitation on the computer device; it may include more components than described above, or combine certain components, or different components. For example, the computer device may also include input / output devices, network access devices, buses, etc.

[0113] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor, or any conventional processor. The processor is the control center of the computer device, connecting various parts of the computer device via various interfaces and lines.

[0114] The memory can be used to store the computer program and / or module, and the processor implements various functions of the computer device by running or executing the computer program and / or module stored in the memory, and by calling the data stored in the memory.

[0115] The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function (such as sound playback or image playback). The data storage area may store data created based on the use of the phone (such as audio data or a phonebook). Furthermore, the memory may include high-speed random access memory (RAM) and non-volatile memory, such as hard disks, RAM, plug-in hard disks, SmartMediaCards (SMC), Secure Digital (SD) cards, flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0116] Example 5

[0117] This embodiment 5 also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described.

[0118] For example, a method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs includes the following steps:

[0119] Step 1: Calculate the theoretical liquid production driven by the external water body after water intrusion;

[0120] Step 2: Calculate the volume of water body affected by the change in formation pressure after water intrusion;

[0121] Step 3: Calculate the water intrusion volume after water intrusion in fault-controlled fractured-vuggy carbonate reservoirs.

[0122] If the modules / units integrated in the computer system are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0123] Based on this understanding, all or part of the processes in the above-described method can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above-described computer method. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or a preset intermediate form, etc.

[0124] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0125] It should be noted that the content contained in the computer-readable storage medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0126] Example 6

[0127] This embodiment 6 provides a computer product, which includes a computer program stored in a computer-readable storage medium. The processor of the computer device reads the computer program from the computer-readable storage medium and executes the computer program, enabling the computer device to perform the method described in embodiment 1, such as:

[0128] A method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs includes the following steps:

[0129] Step 1: Calculate the theoretical liquid production driven by the external water body after water intrusion;

[0130] Step 2: Calculate the volume of water body affected by the change in formation pressure after water intrusion;

[0131] Step 3: Calculate the water intrusion volume after water intrusion in fault-controlled fractured-vuggy carbonate reservoirs.

[0132] It should be noted that those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods.

[0133] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0134] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs, characterized in that, Includes the following steps: Step 1: Based on the obtained well production volume during the stable production stage before water invasion, formation pressure during the stable production stage before water invasion, formation pressure during water invasion, and production volume after water invasion, calculate the theoretical fluid production driven by external water after water invasion. Step 2: Based on the actual formation pressure obtained after water intrusion, calculate the volume of water body that causes the change in formation pressure after water intrusion. Step 3: Based on the theoretical production volume driven by the external water body after water intrusion and the volume of water body causing changes in formation pressure after water intrusion, calculate the water intrusion volume of the fault-controlled fracture-vuggy carbonate reservoir after water intrusion.

2. The method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs according to claim 1, characterized in that, In step 1, the theoretical liquid production driven by the external water body after water intrusion is calculated. The specific method is as follows: S11. Based on the well production volume during the stable production stage before water invasion, the formation pressure during the stable production stage before water invasion, and the formation pressure during water invasion, the production volume per unit pressure drop before water invasion is calculated. S12, based on the liquid production per unit pressure drop before water intrusion, calculate the theoretical liquid production driven by the original elastic energy after water intrusion. S13. Based on the theoretical liquid production driven by the original elastic energy after water intrusion and the obtained production volume after water intrusion, the theoretical liquid production driven by the external water body after water intrusion is calculated.

3. The method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs according to claim 2, characterized in that, In S12, the theoretical liquid production driven by the original elastic energy after water intrusion is calculated. The specific method is as follows: Obtain the formation pressure calculated based on the original production trend without water intrusion; Using the formation pressure calculated based on the original production trend without water intrusion, and combined with the liquid production per unit pressure drop before water intrusion, the theoretical liquid production driven by the original elastic energy after water intrusion is calculated.

4. The method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs according to claim 3, characterized in that, The method for obtaining formation pressure calculated based on the original production trend under the condition of no water intrusion is as follows: Plot a coordinate graph relating formation pressure to cumulative produced fluid volume; On this coordinate graph, the straight line P1P2 between the formation pressure P1 during the stable production stage before water intrusion and the formation pressure P2 during water intrusion is extended to obtain the trend line of the straight line P1P2. By substituting the cumulative produced liquid volume corresponding to the actual formation pressure P4 after water intrusion into the trend line, the formation pressure calculated according to the original production trend under the condition of no water intrusion is obtained.

5. The method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs according to claim 2, characterized in that, In S13, the theoretical liquid production driven by the external water body after water intrusion is calculated according to the following formula: Q2 = N2 - Q1 Where N2 is the production volume of the target oil well after water intrusion; Q2 is the theoretical production volume driven by the external water body after water intrusion; and Q1 is the theoretical production volume driven by the original elastic energy after water intrusion.

6. The method for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs according to claim 1, characterized in that, In step 2, the volume of water body causing the change in formation pressure after water intrusion is calculated according to the following formula: W = J * (P4 - P3) Where P4 is the actual formation pressure after water intrusion; W is the volume of water that causes the formation pressure change after water intrusion; J is the liquid production per unit pressure drop before water intrusion; and P3 is the formation pressure calculated based on the original production trend under the condition of no water intrusion.

7. A system for calculating water intrusion in fault-controlled fractured-vuggy carbonate reservoirs, characterized in that, include: The theoretical production volume calculation unit after water invasion is used to calculate the theoretical production volume driven by external water after water invasion based on the well production volume during the stable production stage before water invasion, the formation pressure during the stable production stage before water invasion, the formation pressure during water invasion, and the production volume of the fault-controlled fractured-vuggy carbonate reservoir after water invasion. The water volume calculation unit after water intrusion is used to calculate the water volume caused by the change in formation pressure after water intrusion, based on the actual formation pressure obtained after water intrusion. The water intrusion calculation unit is used to calculate the water intrusion volume of fault-controlled fracture-vuggy carbonate reservoirs based on the theoretical production volume driven by the external water body after water intrusion and the volume of water body that causes changes in formation pressure after water intrusion.

8. A computer device, characterized in that, include: A processor is used to execute computer programs; A computer-readable storage medium storing a computer program that, when executed by the processor, performs the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 6.

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