Horizontal well group water shutoff and profile control method and related equipment

Abstract

The invention discloses a horizontal well group water shutoff and profile control method and related equipment, and relates to the technical field of oil and gas exploitation, and the method comprises the steps that a horizontal well group with the water content higher than the preset water content in a target oil field area is determined as a first horizontal well group; based on a target water shutoff and profile control process, selecting a horizontal well group with a well completion mode and well conditions meeting preset requirements from the first horizontal well group, and determining the horizontal well group as a second horizontal well group; according to the remaining water drive recoverable reserves of the second horizontal well groups, a third horizontal well group in the second horizontal well groups is screened out; and aiming at a target horizontal well group with the permeability correlation coefficient greater than a preset correlation coefficient in the third horizontal well group, performing water shutoff and profile control treatment according to the target water shutoff and profile control process. According to the method, the target horizontal well group meeting the conditions is screened out step by step through the multi-dimensional screening standards of the water content, the well completion mode, the well condition, the remaining water drive recoverable reserves, the permeability correlation coefficient and the like, it is ensured that the well group finally subjected to water shutoff and profile control treatment has higher potential and pertinence, blind selection is avoided, and unnecessary operation cost is reduced.

Description

Technical Field

[0001] This application relates to the field of oil and gas extraction technology, and more specifically, to a method and related equipment for water shut-off and profile control of horizontal well groups. Background Technology

[0002] With the continuous advancement of oilfield development technology, water shut-off and profile control technology has been widely applied in oil and gas field development as a key means to improve the uneven utilization of oil well profiles and enhance oilfield recovery. However, the complex geological structure and water flooding conditions of horizontal well networks make it particularly difficult to accurately select target well groups when implementing water shut-off and profile control. Therefore, the research and application of water shut-off and profile control well selection technology in horizontal well networks is of paramount importance.

[0003] In existing technologies, target well selection is typically based on injection-production profile testing results. However, due to the difficulty in testing production-suction profiles in horizontal well production and the relative scarcity of testing data, this data-dependent well selection method has limitations. Furthermore, the utilization of horizontal well profiles is significantly affected by variations in biomass along the well path; some well sections are prone to severe water flooding in high-permeability layers while low-permeability layers remain undeveloped, leading to a severe imbalance in profile utilization. Existing technologies often suffer from low accuracy in well selection during water shut-off and profile control, thus affecting the effectiveness of these measures. In other words, existing technologies suffer from insufficient precision in water shut-off and profile control well selection methods and a lack of simplistic well group selection criteria. Summary of the Invention

[0004] The summary section of this application introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The horizontal well group water shut-off and profile control method and related equipment provided in this application can gradually screen out target horizontal well groups that meet the conditions through multiple screening criteria such as water cut, completion method, well condition, remaining water drive recoverable reserves, and permeability correlation coefficient. This ensures that the well groups that are finally subjected to water shut-off and profile control treatment have higher potential and are more targeted, avoiding blind selection and reducing unnecessary operating costs.

[0006] In a first aspect, this application provides a method for water shut-off and profile control of horizontal well groups, comprising: identifying a horizontal well group in a target oilfield area with a water cut higher than a preset water cut as a first horizontal well group; selecting a horizontal well group from the first horizontal well group whose completion method and well condition meet preset requirements based on a target water shut-off and profile control process, and identifying it as a second horizontal well group; screening a third horizontal well group from the second horizontal well group based on the remaining water drive recoverable reserves of the second horizontal well group; and performing water shut-off and profile control treatment on the target horizontal well group in the third horizontal well group whose permeability correlation coefficient is greater than a preset correlation coefficient, according to the target water shut-off and profile control process.

[0007] In one feasible implementation, before selecting a third horizontal well group from the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group, the horizontal well group water shut-off and profile control method further includes: drawing a water-drive characteristic curve based on the cumulative oil production, cumulative water injection, and water cut of the second horizontal well group; determining the current cumulative oil production and economic limit oil production in the second horizontal well group based on the water-drive characteristic curve; and calculating the difference between the economic limit oil production and the current cumulative oil production to obtain the remaining water-drive recoverable reserves of the second horizontal well group.

[0008] In one feasible implementation, the step of selecting a third horizontal well group from the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group includes: identifying the horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than a preset recoverable reserve as the third horizontal well group.

[0009] In one feasible implementation, the step of selecting a third horizontal well group from the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group includes: identifying the horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than a preset recoverable reserve as the fourth horizontal well group; and identifying the horizontal well group in the fourth horizontal well group whose expected production is less than the preset production as the third horizontal well group.

[0010] In one feasible implementation, the step of selecting a horizontal well group from the first horizontal well group that meets preset requirements in terms of completion method and well condition, and determining it as the second horizontal well group, based on the target water shut-off and profile control process, includes: when the target water shut-off and profile control process is a chemical water shut-off and profile control process, selecting a horizontal well group from the first horizontal well group that has a screen completion method and a bottom hole flowing pressure greater than a first preset pressure value, and determining it as the second horizontal well group; when the target water shut-off and profile control process is a physical water shut-off and profile control process, selecting a horizontal well group from the first horizontal well group that has an open hole completion method and a bottom hole flowing pressure greater than a second preset pressure value, and determining it as the second horizontal well group, wherein the second preset pressure value is greater than the first preset pressure value.

[0011] In one feasible implementation, before performing water shut-off and profile control treatment according to the target water shut-off and profile control process for a target horizontal well group in the third horizontal well group whose permeability correlation coefficient is greater than a preset correlation coefficient, the horizontal well group water shut-off and profile control method further includes: determining the permeability correlation coefficient of the third horizontal well group based on the permeability of the production well section and the injection well section, the well section length, and the distance between the well sections in the third horizontal well group.

[0012] In one feasible implementation, determining the permeability correlation coefficient of the third horizontal well group based on the permeability, well length, and inter-well distance of the production and injection well sections in the third horizontal well group includes: calculating the ratio of the permeability of a well section pair to the harmonic mean permeability to obtain a first ratio, wherein the well section pair includes the production well section and the injection well section; calculating the ratio of the product of the well lengths of the well section pair to the inter-well distance to obtain a second ratio; determining the product of the first ratio and the second ratio as the connectivity parameter of the well section pair; and summing the connectivity parameters of all well section pairs in the third horizontal well group to obtain the permeability correlation coefficient of the third horizontal well group.

[0013] Secondly, this application also provides a horizontal well group water shut-off and profile control device, comprising: a first screening unit, used to identify horizontal well groups in a target oilfield area with a water cut higher than a preset water cut as a first horizontal well group; a second screening unit, used to select horizontal well groups from the first horizontal well group whose completion methods and well conditions meet preset requirements based on a target water shut-off and profile control process, and identify them as a second horizontal well group; a third screening unit, used to screen out a third horizontal well group from the second horizontal well group based on the remaining water drive recoverable reserves of the second horizontal well group; and a water shut-off and profile control unit, used to perform water shut-off and profile control treatment on target horizontal well groups in the third horizontal well group whose permeability correlation coefficient is greater than a preset correlation coefficient, according to the target water shut-off and profile control process.

[0014] Thirdly, this application also provides an electronic device, including: a memory and a processor, wherein the processor is configured to execute a computer program stored in the memory to implement the steps of the horizontal well group water shut-off and profile control method described in the first aspect.

[0015] Fourthly, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the horizontal well group water shut-off and profile control method described in the first aspect.

[0016] Fifthly, this application also provides a computer program product, including a computer program or computer-executable instructions, which, when executed by a processor, implement the horizontal well group water shut-off and profile control method provided in the embodiments of this application.

[0017] In summary, this application, by first screening horizontal well groups with water cut exceeding a preset value, effectively focuses on those well groups facing water flooding issues during development, avoiding indiscriminate treatment of the entire oilfield area, concentrating resources to solve key problem wells, and improving development efficiency. In horizontal well development, due to significant differences in physical properties along the well path, uneven profile utilization often occurs. This application, by screening well groups with permeability correlation coefficients exceeding a preset value, can better address this uneven utilization by selecting suitable wells for water shut-off and profile control, thereby balancing the development of the horizontal well profile and improving the overall utilization of horizontal wells. Through precise target well screening, the problem of severe water flooding in high-permeability sections and unutilized low-permeability sections in horizontal well groups can be effectively solved. Furthermore, the application of water shut-off and profile control technology prevents excessive water flooding of high-permeability layers, promotes the development of low-permeability layers, extends the effective production cycle of horizontal wells, directly improves reservoir recovery, increases oil production, and thus enhances the overall economic benefits of the oilfield. In summary, the horizontal well group water shut-off and profile control method provided in this application uses multi-dimensional screening criteria such as water cut, completion method, well condition, remaining water drive recoverable reserves, and permeability correlation coefficient to gradually screen out target horizontal well groups that meet the conditions. This ensures that the well groups that are finally subjected to water shut-off and profile control treatment have higher potential and are more targeted, avoiding blind selection and reducing unnecessary operating costs. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A schematic flowchart illustrating a method for water shut-off and profile control in a horizontal well group, provided as an embodiment of this application;

[0020] Figure 2 A schematic diagram of the composition structure of a horizontal well group water shut-off and profile control device provided in this application embodiment;

[0021] Figure 3 This is a schematic diagram of the composition structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0022] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and not to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms “is” and “has,” and any variations thereof, used in this application are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] In this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented, wholly or partially, using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of a larger module or unit that includes the functionality of that module or unit.

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. In the following description, "some embodiments" are referred to, which describes a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0025] See Figure 1 , Figure 1 This is a flowchart illustrating a method for water shut-off and profile control in a horizontal well group, as provided in an embodiment of this application. The method may specifically include the following steps 101 to 104:

[0026] Step 101: The horizontal well group with a water cut higher than the preset water cut in the target oilfield area is identified as the first horizontal well group;

[0027] Specifically, the target oilfield area is a specific oilfield block requiring water shut-off and profile control operations. This area is pre-determined based on the oilfield development needs and the objectives of water shut-off and profile control, and may include multiple horizontal well groups. These horizontal well groups may have certain similarities or correlations in terms of geological characteristics, development history, and production status. Water cut is the proportion of water in the fluid produced during oil well production, usually expressed as a percentage. Water cut reflects the composition of the oil-water mixture in the well; the higher the water cut, the greater the proportion of water produced. Water cut is one of the important indicators for judging oilfield production efficiency. A high water cut usually means that the well is facing water flooding and requires adjustments such as water shut-off and profile control. The preset water cut is a set standard value that can be set based on the economic limit water cut value. The economic limit water cut is a critical water cut value defined based on economic benefits. When the water cut of an oil well exceeds this critical value, the economic benefits of the oil well will decrease significantly. The first horizontal well group is a well group selected from the target oilfield area with a water cut higher than the preset water cut.

[0028] For example, if the economic limit water cut of a certain oilfield area is 85%, the preset water cut can be set to 75%, that is, the horizontal well group with a water cut of more than 75% can be used as the first horizontal well group for subsequent water shut-off and profile control.

[0029] By implementing step 101, horizontal well groups with water cut exceeding the preset standard are screened out. This allows for the precise identification of well groups that have experienced water flooding during development. These well groups, due to their high water cut, have reduced production efficiency and possess significant potential for water shut-off and profile control. In other words, this screening step effectively focuses on well groups requiring priority treatment, avoiding resource waste and improving the efficiency and focus of development.

[0030] Step 102: Based on the target water shut-off and profile control technology, select a horizontal well group from the first horizontal well group whose completion method and well condition meet the preset requirements, and determine it as the second horizontal well group;

[0031] Specifically, the target water shut-off and profile control process refers to the specific water shut-off and profile control techniques to be used to address water flooding problems in horizontal wells. First, the completion method for each horizontal well group needs to be evaluated, such as screen completion or open-hole completion, to ensure that the completion method matches the water shut-off and profile control process. Next, the well conditions of each well need to be checked, including bottom hole flowing pressure, well physical condition, and operational status, to ensure that the well conditions meet the preset requirements for water shut-off and profile control operations. These preset requirements are standards established based on the specific water shut-off and profile control process. For example, when using chemical water shut-off, the bottom hole flowing pressure may need to be no less than a certain preset value to ensure that the water shut-off material can be successfully injected into the high-permeability layer for sealing; while if physical water shut-off is used, open-hole completion and a higher bottom hole flowing pressure may be required to facilitate mechanical sealing. Through the dual screening of completion method and well conditions, the horizontal well group that meets the conditions is finally determined, referred to as the second horizontal well group.

[0032] By implementing step 102, those horizontal well groups with suitable conditions are further screened out, ensuring that the subsequent water shut-off and profile control process can be carried out smoothly and achieve the expected results. This reduces the risk of operational failure due to poor well conditions and improves the feasibility and efficiency of water shut-off and profile control technology.

[0033] Step 103: Based on the remaining water-drive recoverable reserves of the second horizontal well group, select the third horizontal well group in the second horizontal well group;

[0034] Specifically, the remaining recoverable reserves for waterflooding refer to the amount of oil that the well group can still extract through waterflooding under existing production conditions.

[0035] For example, firstly, the remaining water-drive recoverable reserves of the second horizontal well group are assessed. The remaining recoverable reserves of each well can be estimated using historical data methods, numerical simulation methods, or characteristic curve methods. Then, based on a pre-set reserve threshold, well groups with remaining water-drive recoverable reserves greater than the threshold are selected and identified as the third horizontal well group.

[0036] By implementing step 103, well groups with high remaining recoverable reserves can be selected, avoiding unnecessary operations on well groups with low production potential. This not only optimizes resource allocation but also ensures that well groups treated with water shut-off and profile control have higher economic benefits, further enhancing the overall development efficiency of the oilfield.

[0037] Step 104: For the target horizontal well group in the third horizontal well group whose permeability correlation coefficient is greater than the preset correlation coefficient, perform water shut-off and profile control treatment according to the target water shut-off and profile control process.

[0038] Specifically, the permeability correlation coefficient is a coefficient used to quantify the permeability correlation between different well sections in a well group. Permeability is a parameter describing the ability of fluid to pass through rock pores, while the permeability correlation coefficient is used to represent the interrelationship and influence of permeability between different well sections. A high permeability correlation coefficient indicates good fluid connectivity between well sections, while a low correlation coefficient indicates poor connectivity. The preset correlation coefficient is a pre-set threshold for the permeability correlation coefficient, used to determine whether the well group needs water shut-off and profile control treatment.

[0039] For example, firstly, the permeability correlation coefficient of the third horizontal well group can be calculated, and a preset correlation coefficient threshold can be set; then, well groups with permeability correlation coefficients greater than the threshold are selected as target well groups, indicating that these well groups have a problem of unbalanced profile utilization; finally, according to the determined target water shut-off and profile adjustment technology, corresponding water shut-off and profile adjustment treatments are carried out to improve the balance of injection and production profiles and enhance the overall development effect and economic benefits of the reservoir.

[0040] By implementing step 104, well groups with significant permeability differences in horizontal well profiles can be accurately identified. Well groups with large permeability differences often suffer from uneven profile utilization, with water channeling easily occurring in high-permeability sections and low-permeability sections remaining underdeveloped. Performing water shut-off and profile control on these well groups can balance profile utilization, reduce water flooding in high-permeability sections, promote effective development of low-permeability sections, thereby improving the overall development effect of the well group, extending well life, and increasing reservoir recovery.

[0041] In summary, this application's embodiments, by first screening horizontal well groups with water cut exceeding a preset value, effectively focus on well groups facing water flooding issues during development, avoiding indiscriminate treatment of the entire oilfield area, concentrating resources to solve key problem wells, and improving development efficiency. In horizontal well development, due to significant differences in physical properties along the well path, uneven profile utilization often occurs. This application, by screening well groups with permeability correlation coefficients exceeding a preset value, can better address this uneven profile utilization by selecting suitable wells for water shut-off and profile control, thereby balancing the development of the horizontal well profile and improving the overall utilization of horizontal wells. Through precise target well screening, the problem of severe water flooding in high-permeability sections and unutilized low-permeability sections in horizontal well groups can be effectively solved. Furthermore, the application of water shut-off and profile control technology prevents excessive water flooding of high-permeability layers, promotes the development of low-permeability layers, extends the effective production cycle of horizontal wells, directly improves reservoir recovery, increases oil production, and thus enhances the overall economic benefits of the oilfield. In summary, the horizontal well group water shut-off and profile control method provided in this application uses multiple screening criteria, such as water cut, completion method, well condition, remaining water drive recoverable reserves, and permeability correlation coefficient, to gradually select target horizontal well groups that meet the conditions. This ensures that the well groups that are finally subjected to water shut-off and profile control treatment have higher potential and are more targeted, avoiding blind selection and reducing unnecessary operating costs.

[0042] In some embodiments, prior to step 103, the aforementioned horizontal well group water shut-off and profile control method may further include: drawing a water drive characteristic curve based on the cumulative oil production, cumulative water injection, and water cut of the second horizontal well group; determining the current cumulative oil production and economic limit oil production of the second horizontal well group based on the water drive characteristic curve; and calculating the difference between the economic limit oil production and the current cumulative oil production to obtain the remaining water drive recoverable reserves of the second horizontal well group.

[0043] Specifically, the production data of the second horizontal well group can be analyzed first to extract relevant parameters such as cumulative oil production, cumulative water injection, and water cut. By organizing and summarizing this data, a water drive characteristic curve can be plotted. This curve reflects the oil production patterns and characteristics of the reservoir during water drive development. The water drive characteristic curve typically uses cumulative oil production as the x-axis and water cut or cumulative water injection as the y-axis. Analysis of the curve can determine the development status of the reservoir. After plotting the water drive characteristic curve, the current cumulative oil production and the economic limit oil production of the well group are determined based on the key inflection points. The economic limit oil production usually represents the maximum oil production that the well can achieve under economically permissible conditions. When the oil production approaches this limit, continued production will no longer be economically viable. Next, by calculating the difference between the economic limit oil production and the current cumulative oil production, the remaining recoverable reserves for water drive of the well group are obtained. This difference reflects the remaining oil that the well can still recover through further water drive operations under current production conditions.

[0044] By implementing the above embodiments, existing production data is effectively utilized, avoiding excessive reliance on test data. At the same time, the remaining recovery potential of the horizontal well group is accurately estimated, ensuring that the target well selected for water shut-off and profile control has considerable development potential.

[0045] In some embodiments, step 103 may include: identifying a horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than a preset recoverable reserves as a third horizontal well group.

[0046] Specifically, the remaining water-drive recoverable reserves of the second horizontal well group can be compared with the preset recoverable reserves. The preset recoverable reserves are critical values ​​set based on factors such as oilfield development strategy, economic analysis, and optimal resource allocation. Well groups with remaining water-drive recoverable reserves greater than the preset recoverable reserves threshold are selected as third horizontal well groups.

[0047] The implementation of the above embodiments ensures that the selected well groups have significant remaining development potential, enhances the value and effectiveness of water shut-off and profile control, and ensures that resources are concentrated on high-efficiency well groups.

[0048] In some embodiments, step 103 may include: identifying a horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than a preset recoverable reserves as a fourth horizontal well group; and identifying a horizontal well group in the fourth horizontal well group whose expected production is less than a preset production as a third horizontal well group.

[0049] Specifically, the expected production volume is the production volume that a horizontal well group may achieve within a certain period, based on factors such as the current production status of the well group, reservoir characteristics, historical production data, and future production plans. The preset production volume is a pre-set production standard or threshold used to judge whether the production performance of the horizontal well group has achieved the expected economic goals. The preset production volume is determined based on the economic feasibility of oilfield development, market conditions, and production targets.

[0050] For example, firstly, the remaining water-drive recoverable reserves of each well group in the second horizontal well group can be calculated, and well groups with remaining water-drive recoverable reserves greater than the preset recoverable reserves can be screened out and determined as the fourth horizontal well group; after the fourth horizontal well group is screened out, its expected production is evaluated; the expected production is an indicator that predicts future oil production capacity by analyzing the current production status, historical production and future recoverable reserves of the well group; then, well groups with expected production less than the preset production are further screened out and finally determined as the third horizontal well group.

[0051] By implementing the above embodiments, based on screening the remaining recoverable reserves for waterflooding, further screening of horizontal well groups with expected production volumes lower than preset production volumes ensures that the finally selected well groups not only have large remaining recoverable reserves but also avoid resource waste in high-yield well groups. This multi-level screening is more precise, helps optimize the benefits of water shut-off and profile control, and makes operations more targeted.

[0052] In some embodiments, step 102 may include: when the target water shut-off and profile control process is a chemical water shut-off and profile control process, selecting a horizontal well group from the first horizontal well group whose completion method is screen pipe completion and whose bottom hole flowing pressure is greater than a first preset pressure value, and determining it as the second horizontal well group; when the target water shut-off and profile control process is a physical water shut-off and profile control process, selecting a horizontal well group from the first horizontal well group whose completion method is open hole completion and whose bottom hole flowing pressure is greater than a second preset pressure value, and determining it as the second horizontal well group, wherein the second preset pressure value is greater than the first preset pressure value.

[0053] Specifically, chemical water shut-off and profile control is an oilfield production enhancement measure that involves injecting chemical agents (such as polymers and crosslinking agents) into the reservoir to alter its fluid properties, thereby reducing water production and increasing oil recovery. Screen completion is a well completion method where part or all of the wellbore consists of perforated screens, allowing oil and gas to flow into the wellbore while preventing formation sand particles from entering. Bottomhole flowing pressure refers to the flowing pressure at the bottom of the well during production; it is a crucial parameter affecting well production and reservoir dynamics. The first preset pressure value is a pre-defined pressure standard used to select suitable horizontal well groups in chemical water shut-off and profile control. Only when the bottomhole flowing pressure exceeds this preset value will the corresponding horizontal well group be selected as the second horizontal well group for further water shut-off and profile control considerations. Physical water shut-off profile control differs from chemical water shut-off profile control. Physical water shut-off profile control typically involves using physical methods to alter reservoir permeability, such as using water shut-off balls, plugging agents, and gravel packing, to reduce water production and increase oil recovery. Open-hole completion is a completion method where the well directly produces in the unreinforced open-hole section (i.e., the section without casing). The second preset pressure value is another pre-set pressure standard used in physical water shut-off profile control. Compared to the first preset pressure value, the second preset pressure value is higher and is used to select suitable horizontal well groups for physical water shut-off profile control. Only when the bottomhole flowing pressure exceeds this higher preset value will the corresponding horizontal well group be selected as the second horizontal well group.

[0054] For example, when using chemical water shut-off and profile control, a first preset pressure value can be set to 10 MPa. This means that well groups with screen completion and bottomhole flowing pressure greater than 2.5 MPa need to be selected from the first horizontal well group as the second horizontal well group. Furthermore, the well diameter needs to be greater than 150 mm to ensure the chemical water shut-off agent can be smoothly injected into the well section and penetrate into each permeable layer. The horizontal section length should be no less than 1000 meters to ensure that the water shut-off and profile control covers a sufficiently long horizontal section, improving the effectiveness of the profile control. There should be no fallen tools or other objects obstructing construction inside the well, and the well has good re-entry capability with no well re-entry obstruction recorded in the wellbore history. For another example, when using... When using physical water shut-off and profile control techniques (such as hydraulic fracturing), a second preset pressure value of 3.0 MPa can be set (this value is higher than the first preset pressure value in chemical water shut-off and profile control techniques). This means that it is necessary to select from the first horizontal well group those well groups that have open-hole completion and bottom hole flowing pressure greater than 3.0 MPa as the second horizontal well group. It is also necessary to select casing with an inner diameter greater than 160 mm to ensure that the fracturing equipment can smoothly enter the wellbore and operate. The length of the horizontal section is not less than 1200 meters to ensure that multiple permeable sections can be effectively sealed during hydraulic fracturing. Furthermore, there should be no fallen tools, no obvious wellbore diameter reduction or other obstacles in the wellbore to ensure that the fracturing equipment can operate smoothly.

[0055] By implementing the above embodiments and combining them with process requirements, we can ensure that the selected well groups are adaptable, thereby improving the success rate of water shut-off and profile control operations and reducing operational failures caused by process mismatch.

[0056] In some embodiments, prior to step 104, the aforementioned horizontal well group water shut-off and profile control method may further include: determining the permeability correlation coefficient of the third horizontal well group based on the permeability of the production well section and the injection well section, the well section length, and the distance between well sections in the third horizontal well group.

[0057] Specifically, firstly, permeability data for each well section can be collected, typically through downhole testing, numerical simulation, physical models, and other methods. Next, the permeability difference between the production well section and the injection well section is calculated, reflecting the fluid connectivity between different well sections. Then, based on the length of the well section and the distance between well sections, these factors are comprehensively considered, and relevant mathematical models are used to calculate the permeability correlation coefficient between each well section. This correlation coefficient is used to quantify the fluid connectivity between different well sections and reflect the permeability change trend within the well group.

[0058] By implementing the above embodiments, the fluid connectivity of the well group can be reflected more comprehensively, providing more reliable basic data for water shut-off and profile control, which helps to improve the accuracy and effectiveness of water shut-off and profile control operations.

[0059] In some embodiments, determining the permeability correlation coefficient of the third horizontal well group based on the permeability, well length, and inter-well distance of the production and injection well sections in the third horizontal well group may include: calculating the ratio of the permeability of a pair of well sections to the harmonic mean permeability to obtain a first ratio, wherein the aforementioned pair of well sections includes a production well section and an injection well section; calculating the ratio of the product of the well lengths of the pair of well sections to the inter-well distance to obtain a second ratio; determining the product of the first ratio and the second ratio as the connectivity parameter of the pair of well sections; and summing the connectivity parameters of all pairs of well sections in the third horizontal well group to obtain the permeability correlation coefficient of the third horizontal well group.

[0060] Specifically, the production section refers to the portion of a horizontal well group used to produce oil, gas, or water. Production sections are typically located within oil or gas reservoirs and are designed to maximize oil and gas extraction from the underground reservoir. The water injection section refers to the portion of a horizontal well group specifically designed for injecting water. In many oilfield development projects, water is injected into the oil reservoir through the water injection section to maintain reservoir pressure and improve oil and gas recovery. Water injection can drive oil and gas flow towards the production section, thereby increasing production. The permeability correlation coefficient can be calculated using the following formula:

[0061]

[0062] In the formula, τ K This represents the penetration rate correlation coefficient; It is a double summation symbol, representing the summation of connectivity parameters for each production well segment i (there are n in total) and each injection well segment j (there are m in total); K oi K represents the permeability of the i-th production well section; oHarmean This represents the harmonic mean permeability of the producing well section. The harmonic mean is used to synthesize the permeability of multiple well sections to reflect the overall permeability of the reservoir; K wj K represents the permeability of the j-th injection well section; wHarmean L represents the harmonized average permeability of the injection well section. oi L represents the length of the i-th production well section. The length of a production well section is usually proportional to the reservoir area it can access, affecting the recovery capacity of the well section; wj This represents the length of the j-th water injection well section. The length of the water injection well section affects the coverage of the oil layer by water injection and the oil displacement efficiency. This represents the square of the distance between production well section i and injection well section j. The shorter the distance, the stronger the connectivity between the injection and production well sections, which affects the magnitude of the connectivity parameter.

[0063] By implementing the above embodiments, the connectivity of each well section is taken into account, which helps to more accurately assess the overall permeability and fluid connectivity of the well group, and ensures that the water shut-off and profile control operations can specifically solve the problem of uneven profile utilization and improve the operation effect.

[0064] Furthermore, as an implementation of the aforementioned method embodiments, this application also provides a horizontal well group water shut-off and profile control device for implementing the aforementioned method embodiments. This device embodiment corresponds to the aforementioned method embodiments. For ease of reading, this horizontal well group water shut-off and profile control device embodiment will not repeat the details of the aforementioned method embodiments one by one, but it should be clear that the device in this application embodiment can correspondingly implement all the contents of the aforementioned method embodiments. For example... Figure 2As shown, the horizontal well group water shut-off and profile control device 20 includes: a first screening unit 201, a second screening unit 202, a third screening unit 203, and a water shut-off and profile control unit 204. The first screening unit 201 is used to identify horizontal well groups in the target oilfield area with a water cut higher than a preset water cut as the first horizontal well group. The second screening unit 202 is used to select horizontal well groups from the first horizontal well group whose completion methods and well conditions meet preset requirements, based on the target water shut-off and profile control process, and identify them as the second horizontal well group. The third screening unit 203 is used to screen out the third horizontal well group from the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group. The water shut-off and profile control unit 204 is used to perform water shut-off and profile control treatment on the target horizontal well groups in the third horizontal well group whose permeability correlation coefficient is greater than a preset correlation coefficient, according to the target water shut-off and profile control process.

[0065] In some embodiments, the third screening unit 203 is further configured to plot a water drive characteristic curve based on the cumulative oil production, cumulative water injection and water cut of the second horizontal well group; determine the current cumulative oil production and economic limit oil production of the second horizontal well group based on the water drive characteristic curve; calculate the difference between the economic limit oil production and the current cumulative oil production to obtain the remaining water drive recoverable reserves of the second horizontal well group.

[0066] In some embodiments, the third screening unit 203 is further configured to identify the horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than the preset recoverable reserves as the third horizontal well group.

[0067] In some embodiments, the third screening unit 203 is further configured to identify the horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than the preset recoverable reserves as the fourth horizontal well group; and to identify the horizontal well group in the fourth horizontal well group whose expected production is less than the preset production as the third horizontal well group.

[0068] In some embodiments, the second screening unit 202 is further configured to, when the target water shut-off and profile control process is a chemical water shut-off and profile control process, select a horizontal well group in the first horizontal well group whose completion method is screen pipe completion and whose bottom hole flowing pressure is greater than a first preset pressure value, and determine it as the second horizontal well group; when the target water shut-off and profile control process is a physical water shut-off and profile control process, select a horizontal well group in the first horizontal well group whose completion method is open hole completion and whose bottom hole flowing pressure is greater than a second preset pressure value, and determine it as the second horizontal well group, wherein the second preset pressure value is greater than the first preset pressure value.

[0069] In some embodiments, the water shut-off and profile control unit 204 is further configured to determine the permeability correlation coefficient of the third horizontal well group based on the permeability of the production well section and the injection well section, the well section length, and the distance between well sections in the third horizontal well group.

[0070] In some embodiments, the water shut-off and profile control unit 204 is further configured to calculate the ratio of the permeability of a well section pair to the harmonic average permeability to obtain a first ratio, wherein the well section pair includes a production well section and a water injection well section; calculate the ratio of the product of the well section lengths of the well section pair to the distance between the well sections to obtain a second ratio; determine the product of the first ratio and the second ratio as the connectivity parameter of the well section pair; and accumulate the connectivity parameters of all well section pairs in the third horizontal well group to obtain the permeability correlation coefficient of the third horizontal well group.

[0071] This application also provides a computer-readable storage medium storing computer-executable instructions or computer programs, which, when executed by a processor, will cause the processor to perform any step of the horizontal well group water shut-off and profile control method provided in this application.

[0072] In some embodiments, the computer-readable storage medium may be a memory such as RAM, read-only memory (ROM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); or it may be a variety of devices including one or any combination of the above-mentioned memories.

[0073] In some embodiments, computer-executable instructions may take the form of programs, software, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment.

[0074] In some embodiments, computer-executable instructions may, but do not necessarily, correspond to files in a file system, and may be stored as part of a file that holds other programs or data, for example, in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple co-located files (e.g., files that store one or more modules, subroutines, or code sections).

[0075] In some embodiments, computer-executable instructions may be deployed to execute on an electronic device, or on multiple electronic devices located at one location, or on multiple electronic devices distributed across multiple locations and interconnected via a communication network.

[0076] like Figure 3As shown, this application also provides an electronic device 30, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, it implements any step of the above-mentioned horizontal well group water shut-off and profile control method.

[0077] This application also provides a computer program product comprising a computer program or computer-executable instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer program or computer-executable instructions from the computer-readable storage medium and executes the computer program or computer-executable instructions, causing the electronic device to perform any step of the horizontal well group water shut-off and profile control method described above.

[0078] The above 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.

Claims

1. A method for water shut-off and profile control in a horizontal well group, characterized in that, include: The horizontal well group with a water cut higher than the preset water cut in the target oilfield area is identified as the first horizontal well group; Based on the target water shut-off and profile control technology, a horizontal well group whose completion method and well condition meet the preset requirements is selected from the first horizontal well group and determined as the second horizontal well group; Based on the remaining water-drive recoverable reserves of the second horizontal well group, a third horizontal well group is selected from the second horizontal well group; For the target horizontal well group in the third horizontal well group whose permeability correlation coefficient is greater than the preset correlation coefficient, water shut-off and profile control are carried out in accordance with the target water shut-off and profile control process.

2. The method for water shut-off and profile control in a horizontal well group according to claim 1, characterized in that, Before selecting the third horizontal well group from the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group, the horizontal well group water shut-off and profile control method further includes: Based on the cumulative oil production, cumulative water injection, and water cut of the second horizontal well group, the water drive characteristic curve was plotted. Based on the water drive characteristic curve, determine the current cumulative oil production and the economic limit oil production in the second horizontal well group; The difference between the economically maximum oil production and the current cumulative oil production is calculated to obtain the remaining water-drive recoverable reserves of the second horizontal well group.

3. The method for water shut-off and profile control in a horizontal well group according to claim 1, characterized in that, The step of selecting a third horizontal well group from the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group includes: The horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than the preset recoverable reserves is identified as the third horizontal well group.

4. The method for water shut-off and profile control in a horizontal well group according to claim 1, characterized in that, The step of selecting a third horizontal well group from the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group includes: The horizontal well group in the second horizontal well group whose remaining water-drive recoverable reserves are greater than the preset recoverable reserves is identified as the fourth horizontal well group; The horizontal well group in the fourth horizontal well group whose expected production is less than the preset production is identified as the third horizontal well group.

5. The method for water shut-off and profile control in a horizontal well group according to claim 1, characterized in that, The second horizontal well group is determined by selecting a horizontal well group from the first horizontal well group whose completion method and well condition meet preset requirements based on the target water shut-off and profile control technology. This includes: When the target water shut-off and profile control process is a chemical water shut-off and profile control process, the horizontal well group selected from the first horizontal well group with screen pipe completion and bottom hole flowing pressure greater than the first preset pressure value is determined as the second horizontal well group. When the target water shut-off and profile control process is a physical water shut-off and profile control process, the horizontal well group selected from the first horizontal well group with open hole completion and bottom hole flowing pressure greater than the second preset pressure value is determined as the second horizontal well group, wherein the second preset pressure value is greater than the first preset pressure value.

6. The method for water shut-off and profile control of a horizontal well group according to any one of claims 1 to 5, characterized in that, Before performing water shut-off and profile control treatment according to the target water shut-off and profile control process for the target horizontal well group in the third horizontal well group whose permeability correlation coefficient is greater than the preset correlation coefficient, the horizontal well group water shut-off and profile control method further includes: The permeability correlation coefficient of the third horizontal well group is determined based on the permeability of the production well section and the water injection well section, the well section length, and the distance between the well sections.

7. The method for water shut-off and profile control in a horizontal well group according to claim 1, characterized in that, The determination of the permeability correlation coefficient of the third horizontal well group based on the permeability, well length, and inter-well distance of the production and injection well sections includes: The ratio of the permeability of the well section pair to the harmonic mean permeability is calculated to obtain a first ratio, wherein the well section pair includes the production well section and the injection well section; Calculate the ratio of the product of the lengths of the well segments in the pair of well segments to the distance between the well segments to obtain a second ratio; The product of the first ratio and the second ratio is determined as the connectivity parameter of the well section pair; The connectivity parameters of all well pairs in the third horizontal well group are summed to obtain the permeability correlation coefficient of the third horizontal well group.

8. A horizontal well group water shut-off and profile control device, characterized in that, include: The first screening unit is used to identify horizontal well groups in the target oilfield area with a water cut higher than the preset water cut as the first horizontal well group; The second screening unit is used to select, based on the target water shut-off and profile control process, a horizontal well group whose completion method and well condition meet the preset requirements from the first horizontal well group and determine it as the second horizontal well group; The third screening unit is used to screen out the third horizontal well group in the second horizontal well group based on the remaining water-drive recoverable reserves of the second horizontal well group. The water shut-off and profile control unit is used to perform water shut-off and profile control treatment according to the target water shut-off and profile control process for the target horizontal well group in the third horizontal well group whose permeability correlation coefficient is greater than the preset correlation coefficient.

9. An electronic device, comprising: The memory and processor are characterized in that the processor is used to execute the computer program stored in the memory to implement the steps of the horizontal well group water shut-off and profile control method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the horizontal well group water shut-off and profile control method as described in any one of claims 1-7.

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