A method and related apparatus for evaluating interwell connectivity using multiwell production data

Abstract

The application discloses a kind of methods for evaluating interwell connectivity using multi-well production data and related equipment, according to well spacing, combined with maximum effective radius, well group unit is divided;Through oil well correlation, well group unit is divided into associated well group;Then, using injection-production equation of associated well group, combined with cumulative output of corresponding horizon of oil well and cumulative injection of corresponding horizon of injection well, distribution ratio of each injection well to each oil well and absolute distribution amount are obtained, so as to accurately evaluate interwell connectivity of reservoir dynamic;This method applies production dynamic data and carries out reasonable analysis, can obtain reservoir dynamic interwell connectivity that cannot be accurately obtained by static method;This method uses easily obtained production data to obtain reservoir information of interwell connectivity of block in a fast and low-cost manner;At the same time, it is not limited by construction conditions, and does not affect normal production of oilfield;This method divides associated well group, solves multiple-parameter linear equation set, and achieves the purpose of quantitative evaluation of interwell connectivity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of evaluating interwell connectivity, and particularly relates to a method for evaluating interwell connectivity by using multi-well production data and related equipment. BACKGROUND

[0002] At present, the methods for evaluating interwell connectivity mainly include static method and dynamic method. The static method generally uses small layer comparison and seismic technology for description, which is not applicable to heavy oil reservoirs and fault development reservoirs. The dynamic method includes tracer monitoring, interference testing and production dynamic analysis.

[0003] The principle of tracer monitoring technology is to inject tracer into the injection well, monitor the tracer concentration in the production well, draw the tracer production curve, and judge the connectivity between the injection well and the production well. At present, this method has been widely used in oilfields.

[0004] Interference testing technology is a multi-well testing technology. By changing the production system of the excited well, a high-precision pressure gauge is lowered into the observation well to monitor the change of formation pressure caused by the change. According to the change, the connectivity between the observation well and the excited well is judged.

[0005] Production dynamic analysis technology is a comprehensive judgment method of dynamic indicators by analyzing the change of production indicators to analyze interwell connectivity. Commonly used methods include pressure system analysis, interference testing, production characteristic similarity analysis, and water injection response analysis.

[0006] With the in-depth development of ultra-deep heavy oil reservoirs in some areas, it is found that the current interwell connectivity analysis of ultra-deep heavy oil reservoirs has the following problems:

[0007] The heavy oil reservoirs in these areas have stable sedimentary environment, and the reservoirs develop horizontally and vertically, belonging to massive reservoirs. From the geological point of view, the oil wells and water wells generally have connectivity. Therefore, the static method cannot accurately evaluate the dynamic connectivity of the reservoir.

[0008] With the increasing emphasis on environmental protection, tracer carriers with radioactivity and other pollutants are no longer allowed to be used. The tracer carrier suitable for heavy oil is not mature. The monitoring accuracy of tracer monitoring technology in ultra-deep heavy oil is low, and its application is limited. Due to the general lowering of packers and the large viscosity of fluid in oil wells, the conditions required for interference testing are generally not met. The cost of using tubing head to hang pressure gauges is high and the time is long. In addition, both of the above methods have the disadvantages of long test period and high test cost, which affects the normal production of oilfields. These shortcomings restrict the application of these two testing methods.

[0009] The heavy oil reservoirs in the above-mentioned areas are water-flooded by injected water, and the water property difference is small. If the water test data is used to analyze the interwell connectivity, the effect is poor in the late water breakthrough period of the oil well. Since the production data is easy to obtain, which contains production information about seepage and interwell connectivity, the production data is increasingly becoming a method for studying the connectivity of heavy oil reservoirs. However, due to the influence of multiple injection wells, how to accurately evaluate the influence degree of the injection well on the oil well still needs to be further improved. SUMMARY

[0010] In order to overcome the shortcomings of the above-mentioned technologies, the present application provides a method for evaluating interwell connectivity by using multi-well production data and related equipment, which can solve the technical problem that the existing evaluation method cannot accurately evaluate the interwell connectivity of reservoir dynamics.

[0011] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0012] A method for evaluating interwell connectivity by using multi-well production data, comprising:

[0013] obtaining the well spacing between each injection well and each oil well, and dividing the well spacing into multiple groups of well units in combination with a preset maximum effective radius;

[0014] associating the multiple groups of well units based on the oil well correlation degree, and dividing the multiple groups of well units into multiple associated well groups;

[0015] obtaining the distribution ratio and the absolute distribution amount of each injection well to each oil well based on the injection-production equation of the associated well group, in combination with the cumulative production of the oil well corresponding to the layer and the cumulative injection of the injection well corresponding to the layer;

[0016] evaluating the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount.

[0017] Further, the setting process of the maximum effective radius comprises:

[0018] setting the maximum effective radius of the injection well according to the geology and production characteristics with the injection well in the block as the center.

[0019] Further, the well unit with the same effective oil well is divided into the same associated well group.

[0020] Further, the specific steps of dividing the multiple associated well groups comprise:

[0021] (1) initializing the associated well group, and setting the current well unit as the first associated well group;

[0022] (2) query whether there is any oil well containing the current well group unit in other associated well groups; if so, add the injection well corresponding to the current well group unit to the corresponding associated well group, and continue to the next step; otherwise, a new well group is created and contains the injection well corresponding to the current well group unit, and the next step is continued;

[0023] (3) determine whether it is the last well group unit, if so, exit and output the associated well group; otherwise, point to the next well group unit and re-execute step (2).

[0024] Further, based on the associated well group injection-production equation, the absolute distribution amount of each injection well to each oil well is calculated in combination with the cumulative production of the oil well corresponding horizon, and the specific formula is as follows:

[0025]

[0026] wherein, error; () represents the mean function; () represents the absolute value function; number of injection wells; number of oil wells, 1≤ ≤ ; absolute distribution amount; cumulative production of the oil well corresponding horizon.

[0027] Further, according to the absolute distribution amount, the distribution ratio of each injection well to each oil well is calculated in combination with the cumulative injection amount of the injection well corresponding horizon.

[0028] Further, the specific formula of the distribution ratio is as follows:

[0029]

[0030] wherein, cumulative injection amount of the injection well corresponding horizon; distribution ratio of the injection well to each oil well.

[0031] A system for evaluating interwell connectivity by applying multi-well production data is used to implement the steps of the method for evaluating interwell connectivity by applying multi-well production data, comprising:

[0032] An acquisition module is used to acquire the well spacing between each injection well and each oil well, and divide them into multiple well group units in combination with a preset maximum effective radius;

[0033] An association module is used to associate the multiple well group units based on the oil well association degree, and divide them into multiple associated well groups;

[0034] A calculating module is configured to obtain the distribution ratio of each injection well to each oil well and the absolute distribution amount based on the injection-production equation of the associated well group, in combination with the cumulative output of the corresponding layer of the oil well and the cumulative injection of the corresponding layer of the injection well.

[0035] An evaluating module is configured to evaluate the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount.

[0036] An apparatus comprises:

[0037] A memory is configured to store a computer program.

[0038] A processor is configured to implement the steps of the method for evaluating the interwell connectivity by applying the multi-well production data when the computer program is executed.

[0039] A computer readable storage medium stores a computer program, which is configured to implement the steps of the method for evaluating the interwell connectivity by applying the multi-well production data when the computer program is executed by a processor.

[0040] Compared with the prior art, the present application has the following beneficial effects:

[0041] The present application also provides a method for evaluating the interwell connectivity by applying the multi-well production data. The method divides the well group units according to the well spacing in combination with the maximum effective radius. The well group units are divided into associated well groups through the oil well correlation degree. Then, the distribution ratio of each injection well to each oil well and the absolute distribution amount are obtained by using the injection-production equation of the associated well group in combination with the multi-well production data, i.e., the cumulative output of the corresponding layer of the oil well and the cumulative injection of the corresponding layer of the injection well, so as to accurately evaluate the dynamic interwell connectivity of the reservoir. The method can obtain the dynamic interwell connectivity of the reservoir which cannot be accurately obtained by using the static method by applying the production dynamic data and performing reasonable analysis. The method can obtain the reservoir information of the interwell connectivity of the block in a fast and low-cost manner by using the easily obtained production data. Meanwhile, the method is not limited by the construction conditions and does not affect the normal production of the oilfield. The method divides the associated well groups, solves the multi-parameter linear equation set, and achieves the purpose of quantitatively evaluating the interwell connectivity. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 A flowchart of the method for dividing the associated well groups in the method for evaluating the interwell connectivity by applying the multi-well production data is provided for the embodiments of the present application.

[0043] Figure 2 A schematic diagram of the interwell connectivity of the II1 layer of a certain block of Luokeqi is provided for the embodiments of the present application, which is a relative distribution schematic diagram.

[0044] Figure 3A Lukq certain block II1 layer position well interconnection schematic diagram provided by the embodiment of the application is specifically an absolute allocation schematic diagram.

[0045] Figure 4 A flow chart of a method for evaluating well interconnection by using multi-well production data provided by the application is shown in the figure.

[0046] Figure 5 A structure schematic diagram of a system for evaluating well interconnection by using multi-well production data provided by the application is shown in the figure. DETAILED DESCRIPTION

[0047] The application provides a method for evaluating well interconnection by using multi-well production data, as shown in the figure, comprising the following steps: Figure 4

[0048] S1: Obtain the well spacing between each injection well and each oil well, and divide into multiple groups of well units in combination with a preset maximum effective radius.

[0049] The setting process of the maximum effective radius comprises:

[0050] The maximum effective radius of the injection well is set according to the geology and production characteristics with the injection well in the block as the center.

[0051] S2: Correlate the multiple groups of well units based on the oil well correlation degree, and divide into multiple correlation well groups; specifically, the well unit with the same effective oil well is divided into the same correlation well group.

[0052] Specifically, the specific steps of dividing into multiple correlation well groups comprise:

[0053] (1) Initialize the correlation well group, and set the current well unit as the first correlation well group;

[0054] (2) Query whether there is any oil well corresponding to the current well unit in other correlation well groups; if yes, add the injection well corresponding to the current well unit to the corresponding correlation well group, and continue to the next step; otherwise, a new well group is built and contains the injection well corresponding to the current well unit, and continue to the next step.

[0055] (3) Judge whether it is the last well unit, if yes, exit and output the correlation well group; otherwise, point to the next well unit and re-execute step (2).

[0056] S3: Obtain the allocation ratio of each injection well to each oil well and the absolute allocation amount based on the injection-production equation of the correlation well group, in combination with the cumulative production of the oil well corresponding layer and the cumulative injection of the injection well corresponding layer.

[0057] ​Based on the injection-production equation of the associated well group, the absolute distribution amount of each injection well to each oil well is calculated by combining the cumulative output of the corresponding layer position of the oil well, and the specific formula is as follows:

[0058]

[0059] Wherein, Error is represented by; () represents Function; () represents absolute value function; The number of injection wells is represented by; The number of oil wells is represented by, 1≤ ≤ ; The absolute distribution amount is represented by; The cumulative output of the corresponding layer position of the oil well is represented by.

[0060] According to the absolute distribution amount, the distribution ratio of each injection well to each oil well is calculated by combining the cumulative injection amount of the corresponding layer position of the injection well.

[0061] Wherein, the specific formula of the distribution ratio is as follows:

[0062]

[0063] Wherein, The cumulative injection amount of the corresponding layer position of the injection well is represented by; The distribution ratio of the injection well to each oil well is represented by.

[0064] S4: According to the distribution ratio and the absolute distribution amount, the interwell connectivity of the reservoir is evaluated.

[0065] As shown in Figure 5 The application also provides a system for evaluating interwell connectivity by using multi-well production data, comprising: an acquisition module for acquiring the well spacing between each injection well and each oil well, and dividing into multiple groups of well group units in combination with a preset maximum effective radius; an association module for associating the multiple groups of well group units based on the oil well association degree, and dividing into multiple associated well groups; a calculation module for obtaining the distribution ratio and the absolute distribution amount of each injection well to each oil well based on the injection-production equation of the associated well group, in combination with the cumulative output of the corresponding layer position of the oil well and the cumulative injection amount of the corresponding layer position of the injection well; and an evaluation module for evaluating the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount.

[0066] The application also provides a device, comprising: a memory for storing a computer program; and a processor for executing the computer program to realize the steps of the method for evaluating interwell connectivity by using multi-well production data.

[0067] The processor implements the steps of the above-mentioned application of multi-well production data to evaluate interwell connectivity when executing the computer program, for example: obtaining the well spacing between each injection well and each oil well, and dividing into multiple groups of well units in combination with a preset maximum effective radius; correlating the multiple groups of well units based on the oil well correlation degree, and dividing into multiple correlated well groups; obtaining the distribution ratio and absolute distribution amount of each injection well to each oil well based on the injection-production equation of the correlated well group, in combination with the cumulative production of the corresponding layer of the oil well and the cumulative injection of the corresponding layer of the injection well; and evaluating the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount.

[0068] Alternatively, the processor implements the functions of the modules in the above-mentioned system when executing the computer program, for example: an obtaining module for obtaining the well spacing between each injection well and each oil well, and dividing into multiple groups of well units in combination with a preset maximum effective radius; a correlating module for correlating the multiple groups of well units based on the oil well correlation degree, and dividing into multiple correlated well groups; a calculating module for obtaining the distribution ratio and absolute distribution amount of each injection well to each oil well based on the injection-production equation of the correlated well group, in combination with the cumulative production of the corresponding layer of the oil well and the cumulative injection of the corresponding layer of the injection well; and an evaluating module for evaluating the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount.

[0069] Illustratively, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a preset function, which are used to describe the execution process of the computer program in the device for applying multi-well production data to evaluate interwell connectivity. For example, the computer program can be divided into an obtaining module, a correlating module, a calculating module, and an evaluating module; the specific functions of each module are as follows: the obtaining module is used to obtain the well spacing between each injection well and each oil well, and divide into multiple groups of well units in combination with a preset maximum effective radius; the correlating module is used to correlate the multiple groups of well units based on the oil well correlation degree, and divide into multiple correlated well groups; the calculating module is used to obtain the distribution ratio and absolute distribution amount of each injection well to each oil well based on the injection-production equation of the correlated well group, in combination with the cumulative production of the corresponding layer of the oil well and the cumulative injection of the corresponding layer of the injection well; and the evaluating module is used to evaluate the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount.

[0070] The device for evaluating interwell connectivity by using multi-well production data can be a desktop computer, a notebook computer, a palm computer, a cloud server, and the like. The device for evaluating interwell connectivity by using multi-well production data can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the above is an example of the device for evaluating interwell connectivity by using multi-well production data, and does not constitute a limitation on the device for evaluating interwell connectivity by using multi-well production data, which can include more components, or combine some components, or different components, for example, the device for evaluating interwell connectivity by using multi-well production data can also include an input / output device, a network access device, a bus, and the like.

[0071] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor and the like. The processor is a control center of the device for evaluating interwell connectivity by using multi-well production data, and connects various parts of the device for evaluating interwell connectivity by using multi-well production data through various interfaces and lines.

[0072] The memory can be used to store the computer programs and / or modules, and the processor realizes various functions of the device for evaluating interwell connectivity by using multi-well production data by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory.

[0073] The memory can mainly include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, and the like), and the like. The data storage area can store data created according to use of the mobile phone (such as audio data, a phone book, and the like), and the like. In addition, the memory can include a high-speed random access memory, and can also include a nonvolatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state memory devices.

[0074] The application further provides a computer readable storage medium, which stores a computer program, and the computer program realizes the steps of the method for evaluating interwell connectivity by applying multi-well production data when executed by a processor.

[0075] The modules / units of the system for evaluating interwell connectivity by applying multi-well production data are stored in a computer readable storage medium if they are realized in the form of software function units and sold or used as independent products.

[0076] Based on the understanding, all or part of the processes of the method for evaluating interwell connectivity by applying multi-well production data can also be completed by instructing related hardware through a computer program, the computer program can be stored in a computer readable storage medium, and the computer program can realize the steps of the method for evaluating interwell connectivity by applying multi-well production data when executed by a processor. The computer program includes computer program codes, which can be in the form of source codes, object codes, executable files or preset intermediate forms.

[0077] The computer readable storage medium can include any entity or device, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier wave signal, telecommunication signal and software distribution medium, etc. that can carry the computer program codes.

[0078] The application will be further described below in combination with embodiments and drawings:

[0079] Embodiment

[0080] In order to solve the problems mentioned in the background art, such as long test period, high test cost, influence on environmental protection, influence on normal production of oil fields and inability to accurately and dynamically evaluate, etc., the embodiment provides a method for evaluating interwell connectivity by applying multi-well production data, and the method can accurately evaluate the interwell connectivity of reservoir dynamics.

[0081] Specifically, the method includes the following steps:

[0082] First, determine the research block and layer: according to the production needs, determine the research block and layer.

[0083] Second, divide the well group unit according to the geological and production characteristics.

[0084] Centered on the water injection well within the block, and based on geological and production experience, the maximum effective radius R of the water injection well is set. The oil wells and the water well within the radius R form a well group unit.

[0085] The specific process is as follows:

[0086] (1) Number the water wells in the block from 1 to n; number the oil wells in the block from 1 to m.

[0087] (2) Calculate the distance d between the water injection wells and each oil well in the block.

[0088] (1)

[0089] in,

[0090] (2)

[0091] In the formula, d ij : The distance between the i-th water injection well and the j-th oil well, in meters; x i / y i x: x-coordinates of the layer corresponding to the i-th injection well; j / y j : The horizontal and vertical coordinates of the layer corresponding to the j-th oil well.

[0092] Taking a certain block in Lukeqin as an example, the well coordinates related to the II1 layer are shown in Table 1:

[0093] Table 1 shows the coordinates of wells related to the II1 layer.

[0094]

[0095] The well distance d between each water injection well and each oil well is calculated, as shown in Table 2:

[0096] Table 2 shows the well spacing matrix for layer II1.

[0097]

[0098] (3) Divide the well group into units based on the maximum effective radius R.

[0099] Taking the i-th well group as an example, in the well spacing vector d i Select oil wells with values ​​less than R to form the oil well vector og corresponding to the i-th well group. i And so on, establish the block well group oil well matrix og. Vector og i The vector og composed of non-zero values ​​in i ', forming the oil well index corresponding to the i-th well group.

[0100] (3)

[0101] (4)

[0102] Take a certain block of Lukeqin as an example, according to the principle of well spacing less than the maximum effective radius, the well group unit is divided, as shown in table 3:

[0103] Table 3 is the well group unit of II1 layer

[0104]

[0105] The third step is to divide the associated well group, in this method, the complexity and multiple solutions of solving the injection distribution weight of injection well are reduced by dividing the associated well group, and the calculation accuracy is higher, which is one of the invention points of the application.

[0106] The well group with the same effective oil well is divided in the same associated well group, as shown in table 4, the specific process is as follows: Figure 1

[0107] (1) initialize the associated well group to be empty, and set the current well group as the first well group.

[0108] (2) in the oil well sequence corresponding to each associated well group, find which associated well group contains any oil well corresponding to the current well group; if it exists, add the corresponding injection well of the current well group to the corresponding associated well group, if it does not exist, a new associated well group is built and contains the injection well of the current well group.

[0109] (3) the current well group index points to the next well group and returns to process (2) until the last well group, and exits.

[0110] Here, take a certain block of Lukeqin as an example, and divide the associated well group, as shown in table 4:

[0111] Table 4: division of II1 layer associated well group

[0112]

[0113] The fourth step is to establish the injection distribution weight matrix of well group, in this method, the influence of multiple injection wells on oil well output is fully considered, and the injection distribution weight is set to represent the contribution degree of injection well to oil well output, which is one of the invention points of the application.

[0114] Take the ith well group as an example, the well group contains k oil wells; the injection weight of the injection well corresponding to the layer position distributed to the k oil wells is w i , which satisfies Σw i =1, w i ≥0. Select a period of production time, the injection amount of the ith injection well distributed to the corresponding oil well:

[0115] (5)

[0116] In the formula, I​og i : the injection rate of the i th injection well allocated to the corresponding oil well; I i : the cumulative injection rate of the i th injection well corresponding to the layer; w i : the injection weight of the i th injection well corresponding to the layer allocated to the corresponding oil well.

[0117] The oil wells not included in the i th well group are allocated with zero injection rate, and the allocated rates of the oil wells included in the i th well group constitute the complete injection allocation vector I i ’.

[0118] Here, taking a certain block of Lukeqi as an example, a well group injection allocation weight matrix is established, as shown in Table 5:

[0119] Table 5 Injection allocation weight of well group of II1 layer

[0120]

[0121] Fifthly, the associated well group injection-production equation is established and solved.

[0122] Taking the t th associated well group as an example, it is assumed that the associated well group includes injection wells u and corresponding oil wells k, the same production time, and the cumulative production of the k th oil well corresponding to the layer P i , 1≤i≤k.

[0123] (6)

[0124] The optimal method is applied to solve equation (6) to minimize the error e, and the allocation ratio W and the absolute allocation amount of each injection well to the surrounding oil wells in the t th associated well group are obtained.

[0125] wherein,

[0126] wherein, represents the cumulative injection rate of the injection well corresponding to the layer; represents the allocation ratio of the injection well to each oil well.

[0127] Here, taking a certain block of Lukeqi as an example, the following block interwell connectivity statistical table is formed, as shown in Table 6:

[0128] Table 6 Interwell connectivity statistical table of II1 layer

[0129]

[0130] It should be noted that the relative allocation amount in the above Table 6 is the allocation ratio.

[0131] As shown in Figure 2 and Figure 3 , they are interwell connectivity diagrams of II1 layer of a certain block of Lukeqi, wherein,Figure 2 is a relative allocation schematic diagram, Figure 3 It can be seen from the figure that the method for evaluating interwell connectivity by using multi-well production data provided by the embodiment can efficiently and accurately evaluate the interwell connectivity of an oil reservoir in a certain region by using easily obtained production data.

[0132] In summary, the application provides a method for evaluating interwell connectivity by using multi-well production data and related equipment, which has the following advantages compared with the existing evaluation method:

[0133] First, compared with conventional production performance analysis technology, the application achieves the purpose of quantitative evaluation of interwell connectivity by dividing associated well groups and solving a multi-parameter linear equation set.

[0134] Second, compared with interwell tracer monitoring technology and interference testing technology, the application obtains reservoir information of interwell connectivity in the block in a fast and low-cost manner by using easily obtained production data; at the same time, it is not affected by the influence of construction conditions.

[0135] Third, compared with static evaluation methods, the application can obtain dynamic interwell connectivity of the reservoir that cannot be accurately obtained by using static methods by applying production performance data and performing reasonable analysis.

[0136] The above embodiment is only one of the implementation manners of the technical scheme of the application, and the scope of protection of the application is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily thought of by those skilled in the art within the technical scope disclosed by the application.

Claims

1. A method for evaluating interwell connectivity using multiwell production data, comprising: The method comprises the following steps: obtaining the well spacing between each injection well and each oil well, and dividing the injection wells into multiple well group units in combination with a preset maximum effective radius; based on the oil well correlation degree, correlating the multiple well group units to divide them into multiple associated well groups; based on the injection-production equation of the associated well groups, in combination with the cumulative production of the oil well corresponding to the layer and the cumulative injection of the injection well corresponding to the layer, obtaining the distribution ratio and the absolute distribution amount of each injection well to each oil well; evaluating the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount; wherein the well group units having the same effective oil well are divided into the same associated well group; the specific steps of dividing the multiple associated well groups comprise: (1) initializing the associated well group, and setting the current well group unit as the first associated well group; (2) querying whether there is any oil well corresponding to the current well group unit in other associated well groups; if yes, adding the injection well corresponding to the current well group unit to the corresponding associated well group, and continuing to the next step; otherwise, creating a new well group and containing the injection well corresponding to the current well group unit, and continuing to the next step; (3) judging whether it is the last well group unit; if yes, exiting and outputting the associated well group; otherwise, pointing to the next well group unit and re-executing step (2); based on the injection-production equation of the associated well groups, in combination with the cumulative production of the oil well corresponding to the layer, the absolute distribution amount of each injection well to each oil well is calculated; the specific formula is as follows: wherein, represents error; () represents mean function; () represents absolute value function; represents number of water injection wells; represents number of oil wells, 1≤ ≤ ; represents absolute allocation amount; represents cumulative production amount of oil wells corresponding to horizon. based on the absolute distribution amount, in combination with the cumulative injection of the injection well corresponding to the layer, the distribution ratio of each injection well to each oil well is calculated; the specific formula is as follows: wherein, represents the cumulative injection amount of the water injection well corresponding to the layer position; represents the distribution ratio of the water injection well to each oil well.

2. The method for evaluating interwell connectivity using multiwell production data according to claim 1, wherein, wherein, the setting process of the maximum effective radius comprises: taking the injection well in the block as the center, and setting the maximum effective radius of the injection well according to the geological and production characteristics.

3. A system for evaluating interwell connectivity using multiwell production data, for implementing the steps of the method for evaluating interwell connectivity using multiwell production data according to claim 1 or 2, characterized in that, The method comprises the following steps: an acquisition module, configured to obtain the well spacing between each injection well and each oil well, and divide the injection wells into multiple well group units in combination with a preset maximum effective radius; an association module, configured to correlate the multiple well group units based on the oil well correlation degree to divide them into multiple associated well groups; a calculation module, configured to obtain the distribution ratio and the absolute distribution amount of each injection well to each oil well based on the injection-production equation of the associated well groups, in combination with the cumulative production of the oil well corresponding to the layer and the cumulative injection of the injection well corresponding to the layer; an evaluation module, configured to evaluate the interwell connectivity of the reservoir according to the distribution ratio and the absolute distribution amount.

4. An apparatus, comprising: The method comprises the following steps: a memory, configured to store a computer program; a processor, configured to execute the computer program to implement the steps of the method for evaluating the interwell connectivity by applying the multiple well production data according to claim 1 or 2.

5. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 4. The computer program is executed by the processor to implement the steps of the method for evaluating the interwell connectivity by applying the multiple well production data according to claim 1 or 2.

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