Chemical flooding control method for reservoir easy to produce sand and related equipment

Abstract

The invention discloses a chemical flooding control method for a reservoir easy to produce sand and related equipment. The method comprises the following steps: acquiring resistance coefficient data information of a target well group; acquiring water content data information of the target well group; determining resistance and water content relation information according to the resistance coefficient data information and the water content data information; and controlling mining parameters of chemical flooding according to the resistance water-containing relation information. According to the chemical flooding control method for the easy-to-sand-production reservoir, resistance coefficient data information and water content data information of a target well group are obtained, a resistance water-containing relation is established through the resistance coefficient data information and the water content data information, and an ideal resistance coefficient interval is determined according to the resistance water-containing relation; and the current resistance coefficient data is adjusted by adjusting the mining parameters, so that the current resistance coefficient falls into the ideal resistance coefficient interval, the water content is reduced, and the development effect of chemical flooding is improved.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas production, and more specifically, to a chemical flooding control method for a sand-prone reservoir and related equipment. Background Art

[0002] Chemical flooding is a cutting-edge technology for the conversion of thin oil development. It refers to adding chemicals to the injected water to change the physical and chemical properties of the displacement fluid and the interface properties between the displacement fluid and crude oil and rock minerals, thereby facilitating the production of crude oil. It mainly includes polymer flooding, surfactant / polymer binary composite flooding, alkali / surfactant / polymer ternary composite flooding, etc. The agents used include polymers, surfactants, alkalis and other auxiliary chemicals. At present, China is the country with the largest scale of chemical flooding in the world and is at the world's leading level. However, there is no precedent for the implementation of chemical flooding on a large scale in sand-prone reservoirs, and the research on chemical flooding-related control technologies that are suitable for it is still being gradually explored. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In the first aspect, the present application proposes a method for controlling chemical flooding of a sand-prone reservoir, the method comprising:

[0005] Obtain resistance coefficient data information of the target well group;

[0006] Obtaining water content data information of the above target well group;

[0007] Determine the resistance-water relationship information according to the above-mentioned resistance coefficient data information and the above-mentioned water content data information;

[0008] The production parameters of chemical flooding are controlled by the above-mentioned resistance and water-content relationship information.

[0009] Optionally, the above-mentioned acquisition of the resistance coefficient data information of the target well group includes:

[0010] Determine the pressure-flow index of the water flooding stage according to the wellhead pressure and the injection volume of the water flooding stage;

[0011] Determine the pressure flow index of the chemical flooding stage based on the wellhead pressure and injection volume of the chemical flooding stage;

[0012] The resistance coefficient data information is calculated by the pressure flow index of the water flooding stage and the pressure flow index of the chemical flooding stage.

[0013] Optionally, the determination of the resistance-water content relationship information according to the resistance coefficient data information and the water content data information includes:

[0014] Curve fitting is performed based on the above-mentioned resistance coefficient data information and the above-mentioned water content data information to determine the above-mentioned resistance-water content relationship information.

[0015] Optionally, the above-mentioned control of chemical flooding production parameters through the above-mentioned resistance-water relationship information includes:

[0016] Determine the target resistance coefficient range corresponding to the target water content according to the above resistance-water content relationship information;

[0017] The production parameters of chemical flooding are controlled based on the current resistance coefficient and the above target resistance coefficient range, so that the above current resistance coefficient falls within the above target resistance coefficient range.

[0018] Optionally, the above-mentioned control of chemical flooding production parameters based on the current resistance coefficient and the above-mentioned target resistance coefficient range includes:

[0019] The current injection amount and the current viscosity of the chemical are controlled based on the current resistance coefficient and the above-mentioned target resistance coefficient range.

[0020] Optionally, the above method further includes:

[0021] The above target drag coefficient ranges from 1.20 to 1.73.

[0022] Optionally, the controlling of the current injection amount and the current viscosity of the chemical based on the current resistance coefficient and the target resistance coefficient range includes:

[0023] When the drag coefficient data is less than or equal to a preset threshold, increasing the current viscosity and / or increasing the current injection amount to make the current drag coefficient close to the target drag coefficient range; and / or,

[0024] When the resistance coefficient data is greater than a preset threshold, the current viscosity is reduced and / or the current injection amount is reduced to make the current resistance coefficient close to the target resistance coefficient range.

[0025] In a second aspect, the present application also proposes a chemical flooding control device for a sand-prone reservoir, comprising:

[0026] A first acquisition unit is used to acquire resistance coefficient data information of a target well group;

[0027] A second acquisition unit is used to acquire water content data information of the target well group;

[0028] A determination unit, used to determine the resistance-water content relationship information according to the above-mentioned resistance coefficient data information and the above-mentioned water content data information;

[0029] A control unit is used to control the production parameters of chemical flooding through the above-mentioned resistance and water content relationship information.

[0030] In a third aspect, an electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of the chemical flooding control method for sand-prone reservoirs as described in any one of the first aspects when executing the computer program stored in the memory.

[0031] In a fourth aspect, the present application further proposes a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the chemical flooding control method for a sand-prone reservoir according to any one of the above items in the first aspect is implemented.

[0032] In summary, the chemical flooding control method for sand-prone reservoirs in the embodiment of the present application includes: obtaining resistance coefficient data information of the target well group; obtaining water content data information of the above target well group; determining resistance-water relationship information based on the above resistance coefficient data information and the above water content data information; and controlling the production parameters of the chemical flooding through the above resistance-water relationship information. The present application proposes a chemical flooding control method for sand-prone reservoirs, which obtains resistance coefficient data information and water content data information of the target well group, establishes a resistance-water relationship through the resistance coefficient data information and the water content data information, determines an ideal resistance coefficient range based on the resistance-water relationship, and adjusts the current resistance coefficient data by adjusting the production parameters so that the current resistance coefficient falls into the ideal resistance coefficient range to reduce the water content, thereby improving the development effect of the chemical flooding.

[0033] The chemical flooding control method for sand-prone reservoirs proposed in this application, and other advantages, objectives and features of this application will be partially reflected through the following description, and will also be partially understood by technicians in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0035] Figure 1 A schematic flow chart of a chemical flooding control method for a sand-prone reservoir provided in an embodiment of the present application;

[0036] Figure 2A schematic diagram of daily water injection, apparent water absorption index and resistance coefficient of a single well group provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the correlation between the resistance coefficient and the water content provided in an embodiment of the present application;

[0038] Figure 4 A structural schematic diagram of a chemical flooding control device for a sand-prone reservoir provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of the structure of an electronic device for controlling chemical flooding in a sand-prone reservoir provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The present application proposes a chemical flooding control method for a reservoir prone to sand production, which obtains resistance coefficient data information and water content data information of a target well group, establishes a resistance-water content relationship through the resistance coefficient data information and the water content data information, determines an ideal resistance coefficient range based on the resistance-water content relationship, and adjusts the current resistance coefficient data by adjusting the production parameters so that the current resistance coefficient falls within the ideal resistance coefficient range to reduce the water content, thereby improving the development effect of chemical flooding.

[0041] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0042] The reservoir in Shusan District of Liaohe Oilfield is shallow (950-1700 meters) and poorly compacted. The cementation types are mainly porous and contact, with loose cementation and high mud content (13.9%). Affected by the above reservoir factors, sand is generally produced in oil and water wells, and 93% of oil wells produce sand. Especially after the implementation of chemical flooding in 2017 (6 injections and 17 productions), the sand production in the polymer flooding area was counted and 10 wells had aggravated sand production. The average single well pump inspection cycle decreased from 344 days to 213 days, and the average single well sand production per 10,000 cubic meters of liquid production decreased from 1.9m3 Rise to 3.0m 3 The oil production wells in the well group were affected by this, and it was difficult to increase the production volume and determine the injection intensity. These two difficulties affected the implementation effect of chemical flooding.

[0043] This application mainly studies a method for determining a reasonable resistance coefficient of chemical flooding in a reservoir prone to sand production in combination with the sand production condition of the oil reservoir, thereby improving the development effect of chemical flooding.

[0044] See also Figure 1 , which is a schematic flow chart of a chemical flooding control method for a sand-prone reservoir provided in an embodiment of the present application, which may specifically include:

[0045] S110, obtaining resistance coefficient data information of the target well group;

[0046] For example, the resistance coefficient data information is the ratio between the injection data of the water flooding stage and the injection data of the chemical flooding stage, reflecting the ratio between the frictional mechanical properties of the injected fluid in the water flooding stage and the chemical flooding stage.

[0047] S120, obtaining water content data information of the target well group;

[0048] Exemplarily, the water cut data information of the target well group refers to the water cut data of the target layer section of a specific oil well (well group). Water cut refers to the ratio of the mass of water contained in the oil layer to the mass of oil, usually expressed as a percentage. The water cut data information of the target well group is of great significance for the development and management of oil fields. In the early stage of oil field development, water cut data can be used to formulate production plans and determine the location and injection volume of water injection wells. In the middle stage of oil field development, water cut data can be used to evaluate oil production effects, optimize oil production processes, and improve recovery rates. In the oil field management stage, water cut data can be used to formulate oil field management strategies, optimize production processes, and improve the economic benefits of oil fields.

[0049] S130, determining resistance-water content relationship information according to the resistance coefficient data information and the water content data information;

[0050] Exemplarily, the resistance coefficient data information is the relationship between the resistance coefficient and the production time, and the water content data information is the relationship between the water content of the produced oil and the production time. The relationship between the resistance and water content change is constructed through the resistance coefficient data information and the water content data information, that is, the resistance-water relationship information.

[0051] S140. Control the production parameters of chemical flooding through the above-mentioned resistance and water content relationship information.

[0052] For example, the chemical flooding production parameters are controlled according to the resistance-water relationship information, and the chemical flooding production parameters may include the injection amount of the chemical agent and the viscosity of the injected chemical agent. The production parameters are adjusted to adjust the current resistance coefficient data, so that the water content becomes lower, thereby improving the development effect of the chemical flooding.

[0053] In summary, the present application proposes a chemical drive control method for sand-prone reservoirs, by acquiring the resistance coefficient data information and water content data information of the target well group, establishing a resistance-water content relationship through the resistance coefficient data information and the water content data information, and determining an ideal resistance coefficient range based on the resistance-water content relationship, and adjusting the current resistance coefficient data by adjusting the mining parameters so that the current resistance coefficient falls within the ideal resistance coefficient range to reduce the water content, thereby improving the development effect of chemical drive.

[0054] In some examples, the above-mentioned obtaining the resistance coefficient data information of the target well group includes:

[0055] Determine the pressure-flow index of the water flooding stage according to the wellhead pressure and the injection volume of the water flooding stage;

[0056] Determine the pressure flow index of the chemical flooding stage based on the wellhead pressure and injection volume of the chemical flooding stage;

[0057] The resistance coefficient data information is calculated by the pressure flow index of the water flooding stage and the pressure flow index of the chemical flooding stage.

[0058] For example, water flooding is a method of oil field production that increases the recovery rate of crude oil by injecting water. During the oil production process, the injected water forms a water flooding front, which pushes the crude oil to move toward the wellhead, thereby increasing the recovery rate. Chemical flooding is a method of oil field production that changes the physical properties of the oil layer by injecting chemicals, thereby increasing the oil recovery rate. Commonly used chemicals for chemical flooding include surfactants, polymers, alkalis, etc. These chemicals can reduce the interfacial tension between the water phase and the oil phase of the oil layer, improve the fluidity of the oil, and increase the recovery rate.

[0059] The resistance coefficient data information of the target well group can be calculated by the following formula:

[0060]

[0061] In the formula, R′ f Drag coefficient data information, PII w is the pressure flow index in the water flooding stage, PII p is the pressure flow index in the chemical flooding stage, P kw is the wellhead pressure during water flooding, P hp is the wellhead pressure during chemical flooding, q w is the injection volume in the water flooding stage, q pIt is the injection volume in the chemical flooding stage.

[0062] In some examples, determining the resistance-water content relationship information according to the resistance coefficient data information and the water content data information includes:

[0063] Curve fitting is performed based on the above-mentioned resistance coefficient data information and the above-mentioned water content data information to determine the above-mentioned resistance-water content relationship information.

[0064] For example, Figure 2 The following is a curve of daily water injection, apparent water absorption index and resistance coefficient of a single well group proposed in this application. According to the data of the above curve, the data is sorted to form the following Figure 3 The point diagram shown in FIG. 1 and the resistance coefficient data information and the water content data information are curve-fitted to obtain the resistance-water content relationship information. It should be noted that the apparent water absorption index is the ratio of the daily injection volume of the injection well to the wellhead pressure.

[0065] The curve fitting methods may include, least squares method: a method of obtaining the optimal fitting parameters by minimizing the sum of squared errors between data points and the fitting curve; least squares polynomial fitting: fitting the data points to a polynomial equation, and obtaining the optimal polynomial coefficients by minimizing the sum of squared errors between the data points and the fitting curve; spline interpolation: a method of obtaining a smooth fitting curve by inserting multiple spline curves between the data points; singular value decomposition: a method of obtaining the optimal fitting parameters by performing singular value decomposition on the matrix composed of data points; nonparametric regression: a method of obtaining a fitting curve by smoothing the data points through a method based on a kernel function; nonlinear least squares method: a method of obtaining the optimal fitting parameters by minimizing the sum of squared errors of a nonlinear equation group; genetic algorithm: a method of optimizing the fitting parameters through a method based on the principle of biological evolution to obtain the optimal fitting parameters, etc.

[0066] In some examples, the production parameters of chemical flooding are controlled by the above-mentioned resistance-water relationship information, including:

[0067] Determine the target resistance coefficient range corresponding to the target water content according to the above resistance-water content relationship information;

[0068] The production parameters of chemical flooding are controlled based on the current resistance coefficient and the above target resistance coefficient range, so that the above current resistance coefficient falls within the above target resistance coefficient range.

[0069] For example, the target resistance coefficient range is the range of resistance coefficient values ​​corresponding to a negative change in water content. A decrease in water content indicates that the effect of chemical flooding has been improved.

[0070] In some examples, the above-mentioned control of the production parameters of chemical flooding based on the current resistance coefficient and the above-mentioned target resistance coefficient range includes:

[0071] The current injection amount and the current viscosity of the chemical are controlled based on the current resistance coefficient and the above-mentioned target resistance coefficient range.

[0072] In some examples, the method further includes:

[0073] The above target drag coefficient ranges from 1.20 to 1.73.

[0074] For example, Figure 3 As shown in the figure, the resistance coefficient and water content change correlation curve established based on a large amount of oil and gas production data shows that the intersection points where the water content changes to 0 are 1.20 and 1.73, that is, the water content change is negative between 1.20 and 1.73, which can improve the chemical drive production effect.

[0075] In some examples, controlling the current injection amount and the current viscosity of the chemical based on the current resistance coefficient and the target resistance coefficient range includes:

[0076] When the drag coefficient data is less than or equal to a preset threshold, increasing the current viscosity and / or increasing the current injection amount to make the current drag coefficient close to the target drag coefficient range; and / or,

[0077] When the resistance coefficient data is greater than a preset threshold, the current viscosity is reduced and / or the current injection amount is reduced to make the current resistance coefficient close to the target resistance coefficient range.

[0078] For example, when the resistance coefficient data is less than or equal to the preset threshold, the resistance coefficient is small. In order to make the current resistance coefficient close to the target resistance coefficient range and reduce the water content of the production, the injection concentration of the chemical reagent can be increased and / or the injection amount can be increased. When the resistance coefficient is greater than the preset threshold, the resistance coefficient is large. In order to make the current resistance coefficient close to the target resistance coefficient range and reduce the water content of the production, the injection concentration of the chemical reagent can be reduced and / or the current injection amount can be reduced to reduce the chemical flooding injection pressure.

[0079] See also Figure 4 An embodiment of the chemical flooding control device for sand-prone reservoirs in the embodiments of the present application may include:

[0080] A first acquisition unit 21 is used to acquire resistance coefficient data information of a target well group;

[0081] The second acquisition unit 22 is used to acquire the water content data information of the target well group;

[0082] A determination unit 23, configured to determine resistance-water content relationship information according to the above-mentioned resistance coefficient data information and the above-mentioned water content data information;

[0083] The control unit 24 is used to control the production parameters of chemical flooding through the above-mentioned resistance and water content relationship information. The chemical flooding control device for sand-prone reservoirs can also run the following method:

[0084] Obtain resistance coefficient data information of the target well group;

[0085] Obtaining water content data information of the above target well group;

[0086] Determine the resistance-water relationship information according to the above-mentioned resistance coefficient data information and the above-mentioned water content data information;

[0087] The production parameters of chemical flooding are controlled by the above-mentioned resistance and water-content relationship information.

[0088] In a feasible implementation manner, the above-mentioned acquisition of the resistance coefficient data information of the target well group includes:

[0089] Determine the pressure-flow index of the water flooding stage according to the wellhead pressure and the injection volume of the water flooding stage;

[0090] Determine the pressure flow index of the chemical flooding stage based on the wellhead pressure and injection volume of the chemical flooding stage;

[0091] The resistance coefficient data information is calculated by the pressure flow index of the water flooding stage and the pressure flow index of the chemical flooding stage.

[0092] In a feasible implementation manner, the determination of the resistance-water relationship information based on the resistance coefficient data information and the water content data information includes:

[0093] Curve fitting is performed based on the above-mentioned resistance coefficient data information and the above-mentioned water content data information to determine the above-mentioned resistance-water content relationship information.

[0094] In a feasible implementation, the above-mentioned control of chemical flooding production parameters through the above-mentioned resistance-water relationship information includes:

[0095] Determine the target resistance coefficient range corresponding to the target water content according to the above resistance-water content relationship information;

[0096] The production parameters of chemical flooding are controlled based on the current resistance coefficient and the above target resistance coefficient range, so that the above current resistance coefficient falls within the above target resistance coefficient range.

[0097] In a feasible implementation manner, the above-mentioned control of the production parameters of chemical flooding based on the current resistance coefficient and the above-mentioned target resistance coefficient range includes:

[0098] The current injection amount and the current viscosity of the chemical are controlled based on the current resistance coefficient and the above-mentioned target resistance coefficient range.

[0099] In a feasible implementation manner, the above method further includes:

[0100] The above target drag coefficient ranges from 1.20 to 1.73.

[0101] In a feasible implementation manner, the above-mentioned control of the current injection amount and the current viscosity of the chemical agent based on the current resistance coefficient and the above-mentioned target resistance coefficient range includes:

[0102] When the drag coefficient data is less than or equal to a preset threshold, increasing the current viscosity and / or increasing the current injection amount to make the current drag coefficient close to the target drag coefficient range; and / or,

[0103] When the resistance coefficient data is greater than a preset threshold, the current viscosity is reduced and / or the current injection amount is reduced to make the current resistance coefficient close to the target resistance coefficient range.

[0104] like Figure 5 As shown, an embodiment of the present application also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor, and when the processor 320 executes the computer program 311, the steps of any of the above-mentioned methods for chemical flooding control of sand-prone reservoirs are implemented.

[0105] Since the electronic device introduced in this embodiment is a device used to implement a chemical drive control device for a sand-prone reservoir in the embodiment of the present application, based on the method introduced in the embodiment of the present application, technical personnel in this field can understand the specific implementation mode of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of the present application is not introduced in detail here. As long as the equipment used by technical personnel in this field to implement the method in the embodiment of the present application is within the scope of protection of this application.

[0106] In the specific implementation process, when the computer program 311 is executed by the processor, it can achieve Figure 1 Any implementation manner in the corresponding embodiments.

[0107] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0108] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0109] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0110] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0111] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0112] The present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of chemical flooding control of a sand-prone reservoir in the corresponding embodiment.

[0113] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integration. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)), etc.

[0114] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0115] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0116] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0117] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0118] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0119] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A chemical flooding control method for sand-prone reservoirs. It is characterized in that include: Obtain resistance coefficient data information of the target well group; Acquiring water content data information of the target well group; Determine resistance-water relationship information according to the resistance coefficient data information and the water content data information; The production parameters of chemical flooding are controlled by the resistance-water relationship information.

2. The method according to claim 1, It is characterized in that The step of obtaining the resistance coefficient data information of the target well group includes: Determine the pressure-flow index of the water flooding stage according to the wellhead pressure and the injection volume of the water flooding stage; Determine the pressure flow index of the chemical flooding stage based on the wellhead pressure and injection volume of the chemical flooding stage; The resistance coefficient data information is calculated by the pressure flow index of the water flooding stage and the pressure flow index of the chemical flooding stage.

3. The method according to claim 1, It is characterized in that The determining of the resistance-water relationship information according to the resistance coefficient data information and the water content data information comprises: Curve fitting is performed based on the resistance coefficient data information and the water content data information to determine the resistance-water relationship information.

4. The method according to claim 1, It is characterized in that The method of controlling the production parameters of chemical flooding by using the resistance-water relationship information includes: Determine a target resistance coefficient range corresponding to a target water content according to the resistance-water content relationship information; The production parameters of chemical flooding are controlled based on the current resistance coefficient and the target resistance coefficient range so that the current resistance coefficient falls within the target resistance coefficient range.

5. The method according to claim 1, It is characterized in that The method of controlling the production parameters of chemical flooding based on the current resistance coefficient and the target resistance coefficient range includes: A current injection amount and a current viscosity of the chemical are controlled based on the current drag coefficient and the target drag coefficient range.

6. The method according to claim 4 or 5, It is characterized in that Also includes: The target drag coefficient ranges from 1.20 to 1.

73.

7. The method according to claim 5, It is characterized in that The controlling the current injection amount and the current viscosity of the chemical based on the current resistance coefficient and the target resistance coefficient range includes: When the drag coefficient data is less than or equal to a preset threshold, increasing the current viscosity and / or increasing the current injection amount to make the current drag coefficient close to the target drag coefficient range; and / or, When the drag coefficient data is greater than a preset threshold, the current viscosity is reduced and / or the current injection amount is reduced to make the current drag coefficient close to the target drag coefficient range.

8. A chemical flooding control device for sand-prone reservoirs. It is characterized in that include: A first acquisition unit is used to acquire resistance coefficient data information of a target well group; A second acquisition unit is used to acquire water content data information of the target well group; A determination unit, configured to determine resistance-water content relationship information according to the resistance coefficient data information and the water content data information; A control unit is used to control the production parameters of chemical flooding through the resistance-water relationship information.

9. An electronic device, include: A memory and a processor, wherein the processor is used to implement the steps of the chemical flooding control method for sand-prone reservoirs as described in any one of claims 1 to 7 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, Features: When the computer program is executed by a processor, the method for controlling chemical flooding of a sand-prone reservoir according to any one of claims 1 to 7 is implemented.

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