Water plugging method and device for high water content oil well

Abstract

The present application discloses a water plugging method and device for a high-water-content oil well, the method comprising: obtaining reservoir geological information of a target water plugging well, analyzing the cause of water production based on the reservoir geological information; determining a water plugging strategy based on the cause of water production; establishing a three-dimensional geological model for the target water plugging well based on the reservoir geological information; using a physical simulation method to simulate and characterize the dynamic water plugging process of the water plugging strategy in the three-dimensional geological model, and then using a numerical simulation method to simulate the process of oil well water channeling, water plugging construction, and post-plugging production of the target water plugging well; selecting a plugging agent and determining the auxiliary agent of the plugging agent in accordance with the actual reservoir demand and on-site construction conditions of the target water plugging well to prepare the plugging agent; and using the configured plugging agent to perform water plugging construction on the target water plugging well according to the simulation process of water plugging construction. The present application improves the water plugging efficiency and water plugging effect of the target water plugging well.

Description

Technical Field

[0001] The present application relates to a water plugging technology for oil wells, and in particular to a water plugging method and device for oil wells with high water content. Background Art

[0002] With the continuous advancement of oil field development, the original edge and bottom water in the oil well, as well as the artificially injected water during the oil production process, will flow into the oil well along the high permeability strips or other pores, cracks and other channels in the oil well. In this way, when oil is produced from the oil well, the produced oil will contain a large amount of water, which will greatly reduce the quality of the produced oil. Severe degradation of oil quality will lead to poor benefits of oil reservoir development and development results that are less than expected, resulting in the closure of the oil well and suspension of production.

[0003] During oil well production, chemical water plugging has been widely used for a long time as an effective means to control high water content in oil wells. However, the effects of its implementation vary greatly, and there are generally problems such as low water plugging efficiency, short effective period of water plugging, and unsatisfactory oil well oil increase effect after chemical water plugging. Summary of the invention

[0004] The present application provides a water plugging method and device for a high water content oil well to at least solve the above-mentioned technical problems.

[0005] According to a first aspect of an embodiment of the present application, a water plugging method for a high water-cut oil well is provided, comprising:

[0006] Obtaining reservoir geological information of the target water plugging well, and analyzing the cause of water production based on the reservoir geological information;

[0007] Determine a water blocking strategy based on the water discharge cause;

[0008] Based on the reservoir geological information, a three-dimensional geological model is established for the target water plugging well;

[0009] Using physical simulation methods, the dynamic water plugging process of the water plugging strategy is simulated and characterized in a three-dimensional geological model, and then a numerical simulation method is used to simulate the process of oil well water breakthrough, water plugging construction, and post-plugging production of the target water plugging well;

[0010] According to the actual reservoir requirements and on-site construction conditions of the target water plugging well, a plugging agent is selected and auxiliary agents of the plugging agent are determined to prepare the plugging agent;

[0011] According to the simulation process of water plugging construction, water plugging construction is carried out on the target water plugging well using the configured plugging agent.

[0012] In one possible implementation manner, the step of obtaining reservoir geological information of the target water plugging well includes:

[0013] Obtaining geophysical and reservoir geological information at the location of the target water plugging well, as well as static and dynamic data of the target water plugging well, determining the reservoir conditions and fluid properties of the target water plugging well based on the acquired information, and analyzing the reservoir development characteristics of the target water plugging well;

[0014] The static data include at least one of the following: reservoir burial depth, structural characteristics, sedimentary environment, sedimentary rhythm, reservoir physical properties, and fluid properties;

[0015] The dynamic data may be at least one of the following: reservoir transformation curve, oil well production characteristics, oil well monitoring data, and adjacent well production conditions.

[0016] In one possible implementation manner, after analyzing the cause of water production based on the reservoir geological information, the method further includes:

[0017] According to the established three-dimensional geological model, the production logging data is analyzed by means of reservoir engineering analysis, physical simulation and numerical simulation to determine the flooding cause and water characteristics of the target water plugging well and determine the water plugging target object;

[0018] The method of using reservoir engineering analysis to analyze production logging data includes: obtaining the water drive curve of the target water plugging well and its transformation form, using the water drive curve and its transformation form to perform water production analysis on the sandstone reservoir of the target water plugging well to determine the dynamic law of the reservoir; the reservoir engineering analysis includes the seepage mechanics theory method and the material balance theory method;

[0019] The physical simulation method is used to analyze the production logging data, including: based on the geological model, under the constraint of similarity criteria, setting a physical model that can reflect the actual characteristics of the target oil reservoir and the target water plugging well, simulating the edge and bottom water or injection water penetration process of the target water plugging well through the physical model, and determining the flooding characteristics of the target water plugging well;

[0020] The method of using numerical simulation to analyze the production logging data includes: using three-dimensional geological modeling to establish a mathematical model of the oil reservoir and the target water plugging well, and through the numerical simulation method, the bottom water or injected water intrusion process of the target water plugging well to determine the flooding characteristics of the target water plugging well;

[0021] The production logging data includes at least one of the following: production profile logging, injection profile logging, remaining oil monitoring logging, well testing and its interpretation results.

[0022] In one possible implementation manner, before performing water plugging construction on the target water plugging well using the configured plugging agent, the method further comprises:

[0023] According to the water plugging purpose of the target water plugging well and the selection of plugging agents, a corresponding segment plug combination is selected for the target water plugging well from the segment plug combination design, and the amount of the plugging agent is determined according to the requirements of the plugging depth and strength.

[0024] In one embodiment, the slug combination comprises a combination of at least two of the following slugs:

[0025] Measure water absorption segment plug, temporary plugging protection segment plug, low strength deep plugging segment plug, medium strength sealing segment plug, high strength sealing segment plug, post-pollution relief segment plug, and replacement segment plug.

[0026] In one embodiment, determining the amount of the plugging agent includes:

[0027] When the target water plugging well is a vertical well in a porous medium reservoir, the amount of plugging agent V1 is determined by the following formula:

[0028]

[0029] Among them, V1 is the amount of plugging agent, is the plugging depth, is the borehole size, h is the effective thickness of the bottom layer; is the effective porosity of the target water plugging well, is the formation plugging rate, which is a preset empirical value;

[0030] When the target water plugging well is a horizontal well in a porous medium reservoir, the amount of plugging agent V2 is determined by the following formula:

[0031]

[0032] In the formula, V2 is the amount of plugging agent, a is the liquid absorption coefficient, is the ratio of the actual liquid absorption section to the total horizontal section, b is the vertical depth of the ellipsoid radial section, c is the horizontal radius of the ellipsoid radial section, L is the length of the horizontal section, Φ is the effective porosity, and the ratio of c to b is the ratio of horizontal to vertical permeability;

[0033] When the target water plugging well is a vertical well in a porous and fractured oil reservoir, the amount of plugging agent Q1 is determined by the following formula: ,in:

[0034]

[0035] Where D f is the crack width, is the set empirical value, L f is the crack length, h f is the fracture height, V is the amount of plugging agent entering the formation, is the formation plugging rate, R is the thickness of the plugging agent entering the formation, r is the displacement depth, Φ is the effective porosity, and h is the effective thickness of the formation;

[0036] When the target water plugging well is a horizontal well in a porous and fractured oil reservoir, the amount of plugging agent Q2 is determined by the following formula:

[0037]

[0038] Among them, Q2 is the amount of plugging agent, L is the length of the horizontal section, is the degree of fracture development in the horizontal section, representing the number of fractures developed per unit length; D is the fracture width, which is an empirical value; A is the plugging agent spreading width; B is the plugging agent spreading height; and Φ is the effective porosity.

[0039] According to a second aspect of an embodiment of the present application, a water plugging device for a high water-cut oil well is provided, comprising:

[0040] An analysis unit, used to obtain reservoir geological information of the target water plugging well, and analyze the cause of water production based on the reservoir geological information;

[0041] A first determining unit, configured to determine a water blocking strategy based on the water discharge cause;

[0042] An establishing unit, used for establishing a three-dimensional geological model for the target water plugging well based on the reservoir geological information;

[0043] A simulation unit is used to simulate and characterize the dynamic water plugging process of the water plugging strategy in a three-dimensional geological model using a physical simulation method, and then simulate the process of oil well water breakthrough, water plugging construction, and post-plugging production of the target water plugging well using a numerical simulation method;

[0044] A selection unit, used for selecting a plugging agent according to the actual reservoir requirements and on-site construction conditions of the target water plugging well;

[0045] A second determination unit is used to determine an auxiliary agent of the plugging agent to prepare the plugging agent;

[0046] The processing unit is used to perform water plugging construction on the target water plugging well using the configured plugging agent according to the simulation process of water plugging construction.

[0047] In one possible implementation, the analysis unit is further used for:

[0048] Obtaining geophysical and reservoir geological information at the location of the target water plugging well, as well as static and dynamic data of the target water plugging well, determining the reservoir conditions and fluid properties of the target water plugging well based on the acquired information, and analyzing the reservoir development characteristics of the target water plugging well;

[0049] The static data includes at least one of the following: reservoir burial depth, structural characteristics, sedimentary environment, sedimentary rhythm, reservoir physical properties, and fluid properties;

[0050] The dynamic data may be at least one of the following: reservoir transformation curve, oil well production characteristics, oil well monitoring data, and adjacent well production conditions.

[0051] In one possible implementation, the analysis unit is further used for:

[0052] After analyzing the cause of water production based on the reservoir geological information, the production logging data is analyzed according to the established three-dimensional geological model by using reservoir engineering analysis, physical simulation, and numerical simulation to determine the cause of flooding and water production characteristics of the target water plugging well and determine the target object of water plugging;

[0053] The method of using reservoir engineering analysis to analyze production logging data includes: obtaining the water drive curve of the target water plugging well and its transformation form, using the water drive curve and its transformation form to perform water production analysis on the sandstone reservoir of the target water plugging well to determine the dynamic law of the reservoir; the reservoir engineering analysis includes the seepage mechanics theory method and the material balance theory method;

[0054] The physical simulation method is used to analyze the production logging data, including: based on the geological model, under the constraint of similarity criteria, setting a physical model that can reflect the actual characteristics of the target oil reservoir and the target water plugging well, simulating the edge and bottom water or injection water penetration process of the target water plugging well through the physical model, and determining the flooding characteristics of the target water plugging well;

[0055] The method of using numerical simulation to analyze the production logging data includes: using three-dimensional geological modeling to establish a mathematical model of the oil reservoir and the target water plugging well, and through the numerical simulation method, the bottom water or injected water intrusion process of the target water plugging well to determine the flooding characteristics of the target water plugging well;

[0056] The production logging data includes at least one of the following: production profile logging, injection profile logging, remaining oil monitoring logging, well testing and its interpretation results.

[0057] In one possible implementation, the selection unit is further configured to:

[0058] Before using the configured plugging agent to carry out water plugging construction on the target water plugging well, according to the water plugging purpose of the target water plugging well and the selection of the plugging agent, a corresponding segment plug combination is selected for the target water plugging well from the segment plug combination design, and the amount of the plugging agent is determined according to the requirements of the plugging depth and strength.

[0059] In one embodiment, the slug combination comprises a combination of at least two of the following slugs:

[0060] Measure water absorption segment plug, temporary plugging protection segment plug, low strength deep plugging segment plug, medium strength sealing segment plug, high strength sealing segment plug, post-pollution relief segment plug, and replacement segment plug.

[0061] In one possible implementation, the selection unit is further configured to:

[0062] When the target water plugging well is a vertical well in a porous medium reservoir, the amount of plugging agent V1 is determined by the following formula:

[0063]

[0064] Among them, V1 is the amount of plugging agent, is the plugging depth, is the borehole size, h is the effective thickness of the bottom layer; is the effective porosity of the target water plugging well, is the formation plugging rate, which is a preset empirical value;

[0065] When the target water plugging well is a horizontal well in a porous medium reservoir, the amount of plugging agent V2 is determined by the following formula:

[0066]

[0067] In the formula, V2 is the amount of plugging agent, a is the liquid absorption coefficient, is the ratio of the actual liquid absorption section to the total horizontal section, b is the vertical depth of the ellipsoid radial section, c is the horizontal radius of the ellipsoid radial section, L is the length of the horizontal section, Φ is the effective porosity, and the ratio of c to b is the ratio of horizontal to vertical permeability;

[0068] When the target water plugging well is a vertical well in a porous and fractured oil reservoir, the amount of plugging agent Q1 is determined by the following formula: ,in:

[0069]

[0070] Where D f is the crack width, is the set empirical value, L f is the crack length, h f is the fracture height, V is the amount of plugging agent entering the formation, is the formation plugging rate, R is the thickness of the plugging agent entering the formation, r is the displacement depth, Φ is the effective porosity, and h is the effective thickness of the formation;

[0071] When the target water plugging well is a horizontal well in a porous and fractured oil reservoir, the amount of plugging agent Q2 is determined by the following formula:

[0072]

[0073] Among them, Q2 is the amount of plugging agent, L is the length of the horizontal section, is the degree of fracture development in the horizontal section, representing the number of fractures developed per unit length; D is the fracture width, which is an empirical value; A is the plugging agent spreading width; B is the plugging agent spreading height; and Φ is the effective porosity.

[0074] The technical solution provided by the embodiments of the present application has at least the following beneficial effects:

[0075] This application first obtains the reservoir geological information of the target water plugging well, analyzes the cause of water production, and determines the water plugging strategy; by establishing a three-dimensional geological model and using simulation methods, the process of oil well water seepage, water plugging construction, and post-plugging production of the target water plugging well is simulated to determine the plugging agent and the water plugging construction plan. The technical solution of this application can make plans in advance for possible construction situations, making it convenient for construction personnel to carry out construction according to the plan, and can make construction adjustments in time according to the actual situation on site. The construction site of the technical solution of this application realizes the advance selection and preparation requirements of the plugging agent to ensure that the performance of the plugging agent is qualified, and the segment plug combination can be determined according to the construction simulation process, so that the construction plan is more in line with the target water plugging well, thereby improving the water plugging efficiency and water plugging effect of the target water plugging well.

[0076] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0078] Figure 1 A schematic flow chart of a water plugging method for a high water-content oil well shown in one embodiment of the present application;

[0079] Figure 2 This is a schematic diagram of the composition structure of a water plugging device for a high water-cut oil well shown in one embodiment of the present application;

[0080] Figure 3 It is a structural schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0081] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0082] Figure 1 FIG. 1 is a flow chart of a method for plugging water in a high water-content oil well according to an embodiment of the present application. Figure 1 As shown, the water plugging method for a high water-cut oil well in an embodiment of the present application comprises the following steps:

[0083] Step 101, obtaining reservoir geological information of a target water plugging well, and analyzing the cause of water production based on the reservoir geological information.

[0084] In the embodiment of the present application, the reservoir geological information of the target water plugging well is obtained, including: obtaining geophysical and reservoir geological information of the location of the target water plugging well, as well as static and dynamic data of the target water plugging well, determining the reservoir conditions and fluid properties of the target water plugging well based on the acquired information, and analyzing the reservoir development characteristics of the target water plugging well. Specifically, the embodiment of the present application utilizes the basic concept of geological engineering integration, and with the support of basic geophysical and reservoir geological data, uses static and dynamic data of oil wells to clarify the reservoir conditions and fluid properties of the oil wells, analyze the reservoir development characteristics of the oil wells, establish a single well geological model, and finely describe the high permeability strips or dominant channels to determine the water plugging implementation environment.

[0085] Among them, the static data includes at least one of the following: reservoir burial depth, structural characteristics, sedimentary environment, sedimentary rhythm, reservoir physical properties, fluid properties, as well as the location of the oil well, drilling display, logging display, logging interpretation, etc. The dynamic data of the oil well includes at least one of the following: reservoir transformation curve, oil well production characteristics, dynamic monitoring data, adjacent well production conditions, well repair operation display, etc. The reservoir development characteristics mainly refer to the description of the reservoir characteristics of the oil well under the condition of comprehensive consideration of reservoir heterogeneity. Generally speaking, for sandstone reservoirs, it is necessary to describe the characteristics of its porosity, permeability, reservoir pore throat, etc., as well as the longitudinal and lateral heterogeneity under the influence of material source characteristics, sedimentary microfacies, and rhythmic characteristics; for carbonate reservoirs, it is necessary to describe the degree of development, distribution direction, size of its pores and fractures, as well as the longitudinal and lateral extension characteristics under stress changes, karstification, and reservoir transformation. For other types of reservoirs, the reservoir characteristics can be described according to actual conditions and needs. The single well geological model refers to the reservoir geological model established by three-dimensional geological modeling based on detailed reservoir analysis, or the oil geological concept established by other methods, which is used to more clearly describe the reservoir characteristics and heterogeneity of the oil well. The water plugging implementation environment mainly refers to the key parameters of the water plugging process supporting the comprehensive target water plugging well reservoir burial depth, reservoir temperature, formation water salinity, crude oil viscosity, reservoir physical properties, etc. based on the detailed description of the reservoir.

[0086] Step 102: determine a water blocking strategy based on the water leakage cause.

[0087] In the embodiments of the present application, based on the detailed description of the reservoir, relying on the established geological model, a comprehensive application of reservoir engineering analysis, physical simulation, numerical simulation and other methods, combined with production logging data and dynamic analysis methods, the causes of oil well flooding and water production characteristics are clarified, the water plugging target object is determined, and the water plugging strategy is determined based on the water plugging target object.

[0088] Among them, reservoir engineering methods mainly refer to methods for studying the dynamic laws of reservoirs, including seepage mechanics theory methods, material balance theory methods, and other empirical methods. In reservoir engineering methods, various types of water drive curves and their transformation forms have strong adaptability to water production analysis of sandstone reservoirs. For other types of reservoirs, they can be revised and improved according to actual conditions, and can also play a corresponding role. The physical simulation method mainly refers to the creation of a physical model that can reflect the actual characteristics of the target reservoir and oil well based on the geological model, under the constraint of similarity criteria, and experimental simulation is carried out on this basis to simulate the process of edge and bottom water or injected water intrusion, revealing the flooding characteristics of the target well. The subsequent simulation of the effect of water plugging construction also requires the use of the physical model and experimental method. The relevant parameters obtained can also be used as input parameters for numerical simulation, or for comparative analysis. The numerical simulation method mainly refers to the establishment of a mathematical model of reservoirs and oil wells based on the geological model, using the three-dimensional geological modeling method, and then simulating the process of edge and bottom water or injected water intrusion through the numerical simulation method to reveal the flooding characteristics of the target well. The subsequent simulation of the effect of water plugging construction also requires the use of the mathematical model and experimental method. The production logging data includes at least one of the following: production profile logging, injection profile logging, remaining oil monitoring logging, well testing and its interpretation results, etc. Production logging data helps to more intuitively monitor the characteristics of oil well flooding, especially continuous monitoring data can even analyze the continuous process of the entire flooding.

[0089] Step 103: establishing a three-dimensional geological model for the target water plugging well based on the reservoir geological information.

[0090] In the embodiment of the present application, the three-dimensional geological model is a three-dimensional quantitative random model generated by integrating geological, well logging, geophysical data and various interpretation results or conceptual models, which is a three-dimensional grid body. These three-dimensional grid bodies are based on the surface, faults and horizons, and determine the structure and geometry of the reservoir. Each node in the three-dimensional grid body is attached with a series of attributes, such as porosity, permeability, water saturation, etc. The scale of the model node depends on the size of the oil field. Node attributes can be assigned through well logging, core data and interpretation results, including well profiles, lithology, lithofacies, rock properties, permeability, oil-gas-water interface, various distribution diagrams such as histograms, scatter plots; spatial continuity, such as vertical semi-variograms, etc.

[0091] The embodiments of the present application do not limit the specific method of creating the three-dimensional geological model.

[0092] Step 104, using a physical simulation method to simulate and characterize the dynamic water plugging process of the water plugging strategy in a three-dimensional geological model, and then using a numerical simulation method to simulate the process of oil well water breakthrough, water plugging construction, and post-plugging production of the target water plugging well.

[0093] After the three-dimensional geological model is created, the geological three-dimensional spatial distribution and changes of the reservoir of the target water plugging well can be analyzed, and two-dimensional pictures such as structural maps, isopach maps, lithofacies distribution maps, etc. can be produced. In this way, they can be organically integrated based on the three-dimensional geological model. Based on the three-dimensional geological model, the reservoir of the target water plugging well can be analyzed. From the geological model, the average sand-mud ratio, average porosity and other reservoir average values ​​can be obtained through analysis, and the anisotropy of the reservoir can also be obtained. Through quantitative analysis, the relevant data of the reservoir is determined, and the dynamic water plugging process of the water plugging strategy is simulated and characterized according to the properties of the target water plugging well, and then the overall process of oil well water channeling, water plugging construction, and post-plugging production of the target water plugging well is simulated by numerical simulation methods.

[0094] Step 105, according to the actual reservoir demand and on-site construction conditions of the target water plugging well, a plugging agent is selected and auxiliary agents of the plugging agent are determined to prepare the plugging agent.

[0095] The types of plugging agents mainly include: precipitation plugging agents, granular plugging agents, foam plugging agents, cement plugging agents, gel plugging agents, jelly plugging agents, resin plugging agents, special plugging agents, and compound forms of the above plugging agents.

[0096] The precipitating plugging agent refers to the plugging agent itself or the reaction between the plugging agent and the formation fluid to produce precipitation, forming accumulation in the pore throat or hole, preventing the edge and bottom water and the injected water from continuing to flow into the output. According to the different principles of its precipitation generation, it can form many types of precipitation, such as calcium carbonate precipitation, calcium silicate precipitation, calcium sulfate precipitation, iron hydroxide precipitation, etc.

[0097] The granular plugging agent refers to particles of different sizes prepared by a specific process. The injected particles form a blockage at the pore throat and narrow pores to prevent the edge and bottom water and the injected water from continuing to flow in and out. Depending on the raw materials used to prepare the particles, there are many types, including rubber particles, resin particles, jelly particles, polymer microspheres, clay dispersion particles, etc.

[0098] The foam plugging agent refers to a foam of a certain strength formed on the ground or underground under the action of a foaming agent and a foam stabilizer. The foam is filled in the pores of the reservoir to prevent the edge and bottom water and the injected water from continuing to flow into the production. According to the different foam formation mechanisms, it can be divided into two-phase foam, three-phase foam, foam gel and other specific forms.

[0099] The cement plugging agent refers to different types of dispersions that, after entering the formation, solidify and form a plug in the target reservoir under certain temperature and pressure conditions to prevent the edge and bottom water and injected water from continuing to flow into the production. Its representative types are cement slurry systems of different densities and different types derived from them.

[0100] The gel plugging agent refers to a polymer solution or sol, which forms an elastic semi-solid filled in the reservoir under the conditions of formation temperature and pressure to prevent the edge and bottom water and injected water from continuing to flow into the production. The gels commonly used for water plugging are mainly silica gel and polymer monomer gel. The viscosity gradually increases and finally loses fluidity. The whole system becomes an elastic semi-solid with a uniform appearance and maintains a certain shape. This elastic semi-solid is called a gel. The sol is transformed into a system that cannot flow as a whole, filling and plugging.

[0101] The gel plugging agent refers to a network system formed in the reservoir under the action of the polymer solution concentration increase or the cross-linking agent to prevent the edge and bottom water and the injected water from continuing to flow into the production. The gels commonly used for water plugging include zirconium gel, chrome gel, aluminum gel, starch gel, resin gel, etc.

[0102] The resin plugging agent is mainly prepared by low molecular weight polycondensation process, and can form a filling plug in the reservoir to prevent the edge and bottom water and the injected water from continuing to flow into the production. Its types include rosin, amber, shellac, phenolic resin, polyester resin, polyamide resin, etc.

[0103] The other types of plugging agents are mainly used in plugging agent systems for specific oil reservoirs, including microorganisms, emulsified heavy oil, and compound plugging agents of the above seven types of plugging agents.

[0104] The auxiliary agents mainly refer to other synergistic agents used to improve the water plugging effect, including but not limited to temporary plugging protection agents for protecting non-target layers, pollution removal agents for removing wellbore and near-well pollution, and synergistic agents for improving oil-increasing effects.

[0105] The basic properties of plugging agents refer to parameters that can reflect the water plugging capabilities of different types of plugging agents. Different types of plugging agents are different. Usually, plugging agent density, initial viscosity, plugging strength, stability, etc. are used as basic characterization parameters, supplemented by characteristic parameters of different types of plugging agents, such as the particle size of granular plugging agents, the thickening time of cement plugging agents, the gelling time of jelly plugging agents, etc.

[0106] The embodiment of the present application selects a suitable slug combination from the general slug combination design according to the purpose of water plugging and the selection of the aforementioned plugging agents and reagents, and determines the dosage of different slugs according to the specific requirements such as plugging depth and strength. The embodiment of the present application can also further predict the slug combination based on the aforementioned three-dimensional geological model through physical simulation, mathematical simulation and other means to optimize its slug combination. The slug combination of the embodiment of the present application includes a combination of at least two of the following slugs: a water absorption slug, a temporary plugging protection slug, a low-strength deep plugging slug, a medium-strength plugging slug, a high-strength sealing slug, a post-pollution relief slug, and a displacement slug.

[0107] In the embodiment of the present application, the water absorption plug refers to a plug set up to measure the water absorption index of the target water plugging well. Its purpose is to evaluate the actual liquid absorption capacity of the target water plugging well by measuring the injection pressure of the plug system at different injection displacements, so as to predict the subsequent injection pressures of different plugs and ensure the smooth progress of subsequent construction.

[0108] Temporary plugging protection segment plugs refer to segment plugs set up to prevent non-target water-plugging layers from being contaminated by plugging agents. The method is to temporarily plug non-target water-plugging layers by injecting temporary plugging agents to ensure that subsequent plugging agents do not enter these well sections. After the water-plugging construction is completed, the temporary plugging agent will automatically decompose within a certain period of time, or be removed by other chemical agents to release the oil production capacity of these layers.

[0109] Low-strength deep plugging segment plugs refer to segment plugs designed for deep plugging in the far well area (greater than 5 meters) of the target water plugging well. The method is to inject plugging agents with good flow performance, weak plugging strength and good cost advantages. Through a certain scale of use, plugging agent strips are formed in the far well to control the intrusion of water bodies at the far end. For porous medium reservoirs, low-strength gel plugging agents can generally be used. For porous and fractured reservoirs, elastic particles of different particle sizes, or precipitation and gel systems can be used.

[0110] Medium-strength plugging slugs are designed for effective plugging near the target water well (less than 5 meters and greater than 0.5 meters). The method is to inject a plugging agent system with moderate plugging strength and long plugging validity period as the core slug to ensure the water plugging effect and validity period. For porous medium reservoirs, medium-strength gel plugging agents can be used, and for porous and fractured reservoirs, gel systems or high-strength gel plugging agents can be used.

[0111] High-strength sealing segment plugs are segment plugs designed for high-strength plugging of reservoirs (less than 0.5 meters) near the wellbore of the target water plugging well. The method is to inject plugging agents with high plugging strength and strong erosion resistance to form high-strength plugging in the reservoir near the wellbore to prevent the plugging agent from returning. For porous medium reservoirs, high-strength gel, resin and other plugging agents can be used, and for porous and fractured reservoirs, gel, cement and other plugging agents can be used.

[0112] Post-pollution removal slugs are designed to remove temporary plugging agents from non-target layers, residual plugging agents on the well wall or near the well, and to release the oil production potential of some well sections. According to their different functions, they can be selected into various types such as degelling agents, acidizing agents, and unblocking agents.

[0113] The displacement plug is designed to push all the previous plugs into the formation. According to its different functions, it can be selected into various types such as wellbore protective agent, low-density injection inducer, and conventional displacement fluid.

[0114] In the examples of this application, the dosage of the plugging agent needs to be specified. The dosage is calculated based on the purpose of water plugging and the optimization of the plug segment, the length of the plug segment of the target water plugging well, the reservoir development, the performance of the plugging agent, the plugging depth, the production pressure difference, etc. Generally speaking, for porous media, cylindrical and elliptical calculation formulas are selected, and for porous and fractured reservoirs, a matrix + fracture composite calculation model is selected. For specific reservoirs and processes, it can be designed according to actual conditions.

[0115] Specifically, when the target water plugging well is a vertical well in a porous medium reservoir, the amount of plugging agent V1 is determined by the following formula:

[0116]

[0117] Among them, V1 is the amount of plugging agent, is the plugging depth, is the borehole size, h is the effective thickness of the bottom layer; is the effective porosity of the target water plugging well, is the formation plugging rate, which is a preset empirical value;

[0118] When the target water plugging well is a horizontal well in a porous medium reservoir, the amount of plugging agent V2 is determined by the following formula:

[0119]

[0120] In the formula, V2 is the amount of plugging agent, a is the liquid absorption coefficient, is the ratio of the actual liquid absorption section to the total horizontal section, b is the vertical depth of the ellipsoid radial section, c is the horizontal radius of the ellipsoid radial section, L is the length of the horizontal section, Φ is the effective porosity, and the ratio of c to b is the ratio of horizontal to vertical permeability;

[0121] When the target water plugging well is a vertical well in a porous and fractured oil reservoir, the amount of plugging agent Q1 is determined by the following formula: ,in:

[0122]

[0123] Where D f is the crack width, is the set empirical value, L f is the crack length, h f is the fracture height, V is the amount of plugging agent entering the formation, is the formation plugging rate, R is the thickness of the plugging agent entering the formation, r is the displacement depth, Φ is the effective porosity, and h is the effective thickness of the formation;

[0124] When the target water plugging well is a horizontal well in a porous and fractured oil reservoir, the amount of plugging agent Q2 is determined by the following formula:

[0125]

[0126] Among them, Q2 is the amount of plugging agent, L is the length of the horizontal section, is the degree of fracture development in the horizontal section, representing the number of fractures developed per unit length; D is the fracture width, which is an empirical value; A is the plugging agent spreading width; B is the plugging agent spreading height; and Φ is the effective porosity.

[0127] Step 106, according to the simulation process of water plugging construction, water plugging construction is performed on the target water plugging well using the configured plugging agent.

[0128] Water plugging construction can be carried out according to the requirements of construction purpose, basic data, potential assessment, technical ideas, risk analysis, scheme design, construction process, technical requirements, emergency plans, etc. The construction part needs to reflect material preparation, wellbore preparation, equipment connection, emergency drills, pressure testing and injection, as well as the specific process of each section plug injection. The supporting plans mainly refer to two types: safe operation plans and abnormal handling plans. The safe operation plan is mainly formulated according to the requirements of different work areas. The abnormal handling plan is based on the actual situation of water plugging construction and requires supporting technical plans, mainly including equipment and pipeline failure plans, construction pressure overpressure plans, and climbing pressure insufficient plans.

[0129] The essence of the technical solution of the embodiment of the present application is further illustrated by specific examples below.

[0130] Example 1: The target water plugging well is Well A, which is a vertical well development well in a fracture-cavity carbonate reservoir. The water plugging method includes the following processing steps:

[0131] Step S1, determine the reservoir characteristics of Well A, which is a fracture-cavity carbonate reservoir. The acid fracturing curve shows that pores and fractures are developed near the wellbore, and acid-etched fractures are formed to connect the reservoir far from the wellbore. It is necessary to select a gel plugging agent for selective water plugging.

[0132] Step S2, analyzing the production logging data to analyze the water production characteristics of Well A. According to the continuous production profile logging, the water production comes from the bottom water of the reservoir. As the development progresses, the bottom water gradually rises to the bottom of the well, resulting in water flooding of the oil well, and the remaining oil is mainly distributed in the middle and upper reservoirs.

[0133] Step S3, the main plugging agent of Well A is preferred. According to the characteristics of the pore-type reservoir of Well A, as well as the requirements of deep plugging and protection of the top reservoir, a high-strength gel system is preferred as the main plugging agent. The auxiliary plugging agent is a gel that is easy to break and temporarily plugs, and gelling acid is selected as a plugging and potential release agent. All agents are required to have a temperature resistance of 130°C and a salt resistance of 20×10 4 mg / L.

[0134] Step S4, select the A well to construct the slug. In this example, 7 complete slug combinations are selected, and the front slug is designed to be 20m 3 Oilfield water measurement and water absorption, temporary plugging slug design 10m 3The main section plug is designed with 100 cubic meters of heat-resistant and salt-resistant gel, the sealing agent is 20 cubic meters of high-strength starch glue, and 10 cubic meters of 18% gelling acid is selected as the unblocking section plug. Subsequently, 24 cubic meters of oilfield water are designed according to the wellbore volume to displace the acid into the formation.

[0135] Step S5, completing the construction plan for Well A. The construction plan for Well A is completed according to relevant oilfield standards.

[0136] The water plugging scheme was implemented on-site in Well A. After implementation, the daily oil production increased by 9 tons, with a cumulative increase of 1,300 tons, and the water plugging was effective.

[0137] Example 2: The target water plugging well is Well B, which is a side-drilling horizontal well in a fracture-cavity carbonate reservoir. The water plugging method includes the following processing steps:

[0138] Step S1, analyzing the reservoir characteristics of Well B. The reservoir is a fracture-cavity carbonate reservoir. During the drilling process, there are two vents of about 1 m, accompanied by slight mud loss. The water plugging process must consider both strong plugging strength and prevention of loss.

[0139] Step S2, analyzing the water discharge characteristics of Well B. In this step, reservoir engineering analysis, physical simulation, numerical simulation and other methods are applied, and combined with production logging data and dynamic analysis methods, the causes of oil well flooding and water discharge characteristics are clarified, and the water plugging target is determined. After analysis, B is a type A water drive curve of Well B, which has only one slope, and the slope is relatively low, indicating that there is only one water body supply, the water body energy is not strong, the bottom water is mainly produced along the dominant channel of venting and leakage, and the remaining oil is distributed in other reservoirs.

[0140] Step S3, selecting the main plugging agent for Well B. According to the reservoir characteristics and water production characteristics of Well B, silicate gel is selected as a temporary plugging agent, polymer monomer gel is used as a low-strength deep plugging segment plug, ultra-low density cement plugging agent is used as a medium-strength plugging segment plug, and medium-density acid-degradable cement plugging agent is used as a sealing agent.

[0141] Step S4, preferably constructing a slug in Well B. Considering the complexity of water plugging, five slug combinations are selected, namely, the front slug design is 20m 3 The oilfield water absorbs water, and the temporary plugging section is designed with 218 cubic meters of silica gel plugging agent, the low-strength deep plugging section is designed with 106 cubic meters of polymer monomer gel, the medium-strength plugging section is designed with 60 cubic meters of ultra-low density cement plugging agent, and the sealing section is designed with 6 cubic meters of medium-density acid-degradable cement plugging agent. Considering that the well is a horizontal well, oilfield water is used to replace it to release the potential of the potential layer.

[0142] Step S5, complete the construction plan for Well B. This well may have leakage, requiring that after the main plugging agent enters the formation, it is necessary to ensure a climbing pressure of more than 3MPa and adjust the silicate gel concentration in time.

[0143] The water plugging scheme was implemented on site in Well B, which increased oil production by 13 tons per day and 2,400 tons cumulatively, and the water plugging was effective.

[0144] Example 3: The target water plugging well is Well C, which is a horizontal well in a clastic reservoir. The water plugging method includes the following processing steps:

[0145] Step S1, analyzing the reservoir characteristics of Well C. Well C in this example belongs to a medium-porosity, medium-permeability, large bottom-water clastic reservoir, with a braided river delta sedimentary microfacies, the wellbore end is close to the oil-water interface, and a 20m high-permeability section is developed. Compared with other well sections, the permeability range is more than 10. Therefore, it is considered to use an ultra-fine particle plugging agent that matches the pore throat of the high-permeability section for plugging.

[0146] Step S2: Analyze the production logging data to analyze the water production characteristics of Well C. Well C is a typical case of water production caused by physical property differences in the horizontal section. The bottom water is mainly produced along the high-depth strip of 20m at the heel end, resulting in water flooding in the well. The water drive curve shows stable water drive, and the water invasion degree is weak.

[0147] Step S3, the main plugging agent of Well C is preferred. Considering the need to plug the deep throat of the high permeability section, based on the throat analysis data of the formation core sampling, the application of the one-third bridging theory, and the need for later unblocking, 300 mesh and 1000 mesh ultrafine calcium carbonate particles are used as the main plugging agent, and 100 mesh ultrafine calcium carbonate particles are reserved.

[0148] Step S4, preferably constructing a slug in Well C. In this example, considering that the plugging section is short and the plugging depth is not deep, and the suspension of ultrafine calcium carbonate particles by conventional oilfield water, a combination of slugs from small to large and then to small is adopted, with a concentration of 500-3000 mg / L and a total designed liquid volume of 104 cubic meters.

[0149] Step S5, complete the construction plan of Well C. The plugging effect of this well mainly depends on the size of the climbing pressure, so it is required that after the main plugging agent enters the formation, a climbing pressure of more than 5MPa must be guaranteed. If there is no pressure, consider adding 100-mesh ultrafine calcium carbonate.

[0150] Well C adopted this water plugging solution for on-site implementation. After plugging, the water level dropped by 11.19 percentage points, the water plugging took effect 864 days, and the oil production increased by 11,316 tons. The water plugging was effective.

[0151] By adopting the construction scheme design method provided by the present invention, the water plugging efficiency in field practice has been greatly increased, and good economic benefits have been obtained. Specifically, the water plugging efficiency of fracture-cavity carbonate reservoirs in a certain oil field has been increased from about 51% in the early stage of application to more than 75%, making water plugging a conventional production increase measure, with annual application exceeding 200 wells, and increasing oil production by 150,000 tons. The water plugging efficiency of horizontal wells in clastic reservoirs in a certain oil field has been increased from about 45% in the early stage of application to more than 68%. The water plugging process has become one of the main management methods of the reservoir, which has effectively improved the comprehensive management effect of the reservoir.

[0152] The water plugging method provided in the embodiment of the present application formulates a water plugging construction plan design for a specific high-water-content well and implements it effectively, which can increase the water plugging efficiency by at least 15 percentage points.

[0153] Figure 2 This is a schematic diagram of the composition structure of a water plugging device for a high water-content oil well according to an embodiment of the present application. Figure 2 As shown, the water plugging device for a high water-cut oil well according to an embodiment of the present disclosure includes:

[0154] An analysis unit 20 is used to obtain reservoir geological information of a target water plugging well and analyze the cause of water production based on the reservoir geological information;

[0155] A first determining unit 21, configured to determine a water blocking strategy based on the water discharge cause;

[0156] An establishing unit 22, configured to establish a three-dimensional geological model for the target water plugging well based on the reservoir geological information;

[0157] The simulation unit 23 is used to simulate and characterize the dynamic water plugging process of the water plugging strategy in the three-dimensional geological model by using a physical simulation method, and then simulate the process of oil well water breakthrough, water plugging construction, and post-plugging production of the target water plugging well by using a numerical simulation method;

[0158] A selection unit 24 is used to select a plugging agent according to the actual reservoir requirements and on-site construction conditions of the target water plugging well;

[0159] The second determining unit 25 is used to determine the auxiliary agent of the blocking agent to prepare the blocking agent;

[0160] The processing unit 26 is used to perform water plugging construction on the target water plugging well using the configured plugging agent according to the simulation process of water plugging construction.

[0161] In one embodiment, the analysis unit 20 is further configured to:

[0162] Obtaining geophysical and reservoir geological information at the location of the target water plugging well, as well as static and dynamic data of the target water plugging well, determining the reservoir conditions and fluid properties of the target water plugging well based on the acquired information, and analyzing the reservoir development characteristics of the target water plugging well;

[0163] The static data includes at least one of the following: reservoir burial depth, structural characteristics, sedimentary environment, sedimentary rhythm, reservoir physical properties, and fluid properties;

[0164] The dynamic data may be at least one of the following: reservoir transformation curve, oil well production characteristics, oil well monitoring data, and adjacent well production conditions.

[0165] In one embodiment, the analysis unit 20 is further configured to:

[0166] After analyzing the cause of water production based on the reservoir geological information, the production logging data is analyzed according to the established three-dimensional geological model by using reservoir engineering analysis, physical simulation, and numerical simulation to determine the cause of flooding and water production characteristics of the target water plugging well and determine the target object of water plugging;

[0167] The method of using reservoir engineering analysis to analyze production logging data includes: obtaining the water drive curve of the target water plugging well and its transformation form, using the water drive curve and its transformation form to perform water production analysis on the sandstone reservoir of the target water plugging well to determine the dynamic law of the reservoir; the reservoir engineering analysis includes the seepage mechanics theory method and the material balance theory method;

[0168] The physical simulation method is used to analyze the production logging data, including: based on the geological model, under the constraint of similarity criteria, setting a physical model that can reflect the actual characteristics of the target oil reservoir and the target water plugging well, simulating the edge and bottom water or injection water penetration process of the target water plugging well through the physical model, and determining the flooding characteristics of the target water plugging well;

[0169] The method of using numerical simulation to analyze the production logging data includes: using three-dimensional geological modeling to establish a mathematical model of the oil reservoir and the target water plugging well, and through the numerical simulation method, the bottom water or injected water intrusion process of the target water plugging well to determine the flooding characteristics of the target water plugging well;

[0170] The production logging data includes at least one of the following: production profile logging, injection profile logging, remaining oil monitoring logging, well testing and its interpretation results.

[0171] In one embodiment, the selection unit 24 is further configured to:

[0172] Before using the configured plugging agent to carry out water plugging construction on the target water plugging well, according to the water plugging purpose of the target water plugging well and the selection of the plugging agent, a corresponding segment plug combination is selected for the target water plugging well from the segment plug combination design, and the amount of the plugging agent is determined according to the requirements of the plugging depth and strength.

[0173] In one embodiment, the slug combination comprises a combination of at least two of the following slugs:

[0174] Measure water absorption segment plug, temporary plugging protection segment plug, low strength deep plugging segment plug, medium strength sealing segment plug, high strength sealing segment plug, post-pollution relief segment plug, and replacement segment plug.

[0175] In one embodiment, the selection unit 24 is further configured to:

[0176] When the target water plugging well is a vertical well in a porous medium reservoir, the amount of plugging agent V1 is determined by the following formula:

[0177]

[0178] Among them, V1 is the amount of plugging agent, is the plugging depth, is the borehole size, h is the effective thickness of the bottom layer; is the effective porosity of the target water plugging well, is the formation plugging rate, which is a preset empirical value;

[0179] When the target water plugging well is a horizontal well in a porous medium reservoir, the amount of plugging agent V2 is determined by the following formula:

[0180]

[0181] In the formula, V2 is the amount of plugging agent, a is the liquid absorption coefficient, is the ratio of the actual liquid absorption section to the total horizontal section, b is the vertical depth of the ellipsoid radial section, c is the horizontal radius of the ellipsoid radial section, L is the length of the horizontal section, Φ is the effective porosity, and the ratio of c to b is the ratio of horizontal to vertical permeability;

[0182] When the target water plugging well is a vertical well in a porous and fractured oil reservoir, the amount of plugging agent Q1 is determined by the following formula: ,in:

[0183]

[0184] Where D f is the crack width, is the set empirical value, L f is the crack length, h f is the fracture height, V is the amount of plugging agent entering the formation, is the formation plugging rate, R is the thickness of the plugging agent entering the formation, r is the displacement depth, Φ is the effective porosity, and h is the effective thickness of the formation;

[0185] When the target water plugging well is a horizontal well in a porous and fractured oil reservoir, the amount of plugging agent Q2 is determined by the following formula:

[0186]

[0187] Among them, Q2 is the amount of plugging agent, L is the length of the horizontal section, is the degree of fracture development in the horizontal section, representing the number of fractures developed per unit length; D is the fracture width, which is an empirical value; A is the plugging agent spreading width; B is the plugging agent spreading height; and Φ is the effective porosity.

[0188] In an exemplary embodiment, the aforementioned units and the like may be implemented by one or more central processing units (CPU), graphics processing units (GPU), application specific integrated circuits (ASIC), DSPs, programmable logic devices (PLD), complex programmable logic devices (CPLD), field programmable gate arrays (FPGA), general-purpose processors, controllers, microcontrollers (MCU), microprocessors, or other electronic components.

[0189] Regarding the device in the above embodiment, the specific manner in which each module and unit performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0190] Figure 3 8 is a schematic block diagram of an example electronic device 800 that can be used to implement an embodiment of the present disclosure. Figure 3As shown, the electronic device 800 includes a computing unit 801, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 802 or a computer program loaded from a storage unit 808 to a random access memory (RAM) 803. In the RAM 803, various programs and data required for the operation of the electronic device 800 can also be stored. The computing unit 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0191] A number of components in the electronic device 800 are connected to the I / O interface 805, including: an input unit 806, such as a keyboard, a mouse, etc.; an output unit 807, such as various types of displays, speakers, etc.; a storage unit 808, such as a disk, an optical disk, etc.; and a communication unit 809, such as a network card, a modem, a data processing transceiver, etc. The communication unit 809 allows the electronic device 800 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0192] The computing unit 801 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 801 performs the various methods and processes described above, such as the water plugging method for high water-cut oil wells. For example, in some embodiments, the water plugging method for high water-cut oil wells may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 808. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 800 via the ROM 802 and / or the communication unit 809. When the computer program is loaded into the RAM 803 and executed by the computing unit 801, one or more steps of the water plugging method for high water-cut oil wells described above may be performed. Alternatively, in other embodiments, the computing unit 801 may be configured to execute the water plugging method for the high water-cut oil well by any other appropriate means (for example, by means of firmware).

[0193] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0194] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0195] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0196] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0197] The systems and techniques described herein may be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0198] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship of client and server is generated by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, a server of a distributed system, or a server combined with a blockchain.

[0199] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0200] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0201] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A water plugging method for a high water content oil well, characterized in that: The method comprises: Obtaining reservoir geological information of the target water plugging well, and analyzing the cause of water production based on the reservoir geological information; Determine a water blocking strategy based on the water discharge cause; Based on the reservoir geological information, a three-dimensional geological model is established for the target water plugging well; Using physical simulation methods, the dynamic water plugging process of the water plugging strategy is simulated and characterized in a three-dimensional geological model, and then a numerical simulation method is used to simulate the process of oil well water breakthrough, water plugging construction, and post-plugging production of the target water plugging well; According to the actual reservoir requirements and on-site construction conditions of the target water plugging well, a plugging agent is selected and auxiliary agents of the plugging agent are determined to prepare the plugging agent; According to the simulation process of water plugging construction, water plugging construction is performed on the target water plugging well using the configured plugging agent; After analyzing the cause of water production based on the reservoir geological information, the method further includes: According to the established three-dimensional geological model, the production logging data is analyzed by means of reservoir engineering analysis, physical simulation and numerical simulation to determine the flooding cause and water characteristics of the target water plugging well and determine the water plugging target object; The method of using reservoir engineering analysis to analyze production logging data includes: obtaining the water drive curve of the target water plugging well and its transformation form, using the water drive curve and its transformation form to perform water production analysis on the sandstone reservoir of the target water plugging well to determine the dynamic law of the reservoir; the reservoir engineering analysis includes the seepage mechanics theory method and the material balance theory method; The physical simulation method is used to analyze the production logging data, including: based on the geological model, under the constraint of similarity criteria, setting a physical model that can reflect the actual characteristics of the target oil reservoir and the target water plugging well, simulating the edge and bottom water or injection water penetration process of the target water plugging well through the physical model, and determining the flooding characteristics of the target water plugging well; The method of using numerical simulation to analyze the production logging data includes: using three-dimensional geological modeling to establish a mathematical model of the oil reservoir and the target water plugging well, and through the numerical simulation method, the bottom water or injected water intrusion process of the target water plugging well to determine the flooding characteristics of the target water plugging well; The production logging data includes at least one of the following: production profile logging, injection profile logging, remaining oil monitoring logging, well testing and its interpretation results.

2. The method according to claim 1, characterized in that The step of obtaining reservoir geological information of the target water plugging well includes: Obtaining geophysical and reservoir geological information at the location of the target water plugging well, as well as static and dynamic data of the target water plugging well, determining the reservoir conditions and fluid properties of the target water plugging well based on the acquired information, and analyzing the reservoir development characteristics of the target water plugging well; The static data includes at least one of the following: reservoir burial depth, structural characteristics, sedimentary environment, sedimentary rhythm, reservoir physical properties, and fluid properties; The dynamic data may be at least one of the following: reservoir transformation curve, oil well production characteristics, oil well monitoring data, and adjacent well production conditions.

3. The method according to claim 1, characterized in that Before performing water plugging construction on the target water plugging well using the configured plugging agent, the method further comprises: According to the water plugging purpose of the target water plugging well and the selection of plugging agents, a corresponding segment plug combination is selected for the target water plugging well from the segment plug combination design, and the amount of the plugging agent is determined according to the requirements of the plugging depth and strength.

4. The method according to claim 3, characterized in that The slug combination comprises a combination of at least two of the following slugs: Measure water absorption segment plug, temporary plugging protection segment plug, low strength deep plugging segment plug, medium strength sealing segment plug, high strength sealing segment plug, post-pollution relief segment plug, and replacement segment plug.

5. The method according to claim 3, characterized in that: Determining the amount of the plugging agent includes: When the target water plugging well is a vertical well in a porous medium reservoir, the amount of plugging agent V1 is determined by the following formula: Among them, V1 is the amount of plugging agent, is the plugging depth, is the borehole size, h is the effective thickness of the bottom layer; is the effective porosity of the target water plugging well, is the formation plugging rate, which is a preset empirical value; When the target water plugging well is a horizontal well in a porous medium reservoir, the amount of plugging agent V2 is determined by the following formula: In the formula, V2 is the amount of plugging agent, a is the liquid absorption coefficient, is the ratio of the actual liquid absorption section to the total horizontal section, b is the vertical depth of the ellipsoid radial section, c is the horizontal radius of the ellipsoid radial section, L is the length of the horizontal section, Φ is the effective porosity, and the ratio of c to b is the ratio of horizontal to vertical permeability; When the target water plugging well is a vertical well in a porous and fractured oil reservoir, the amount of plugging agent Q1 is determined by the following formula: ,in: Where D f is the crack width, is the set empirical value, L f is the crack length, h f is the fracture height, V is the amount of plugging agent entering the formation, is the formation plugging rate, R is the thickness of the plugging agent entering the formation, r is the displacement depth, Φ is the effective porosity, and h is the effective thickness of the formation; When the target water plugging well is a horizontal well in a porous and fractured oil reservoir, the amount of plugging agent Q2 is determined by the following formula: Among them, Q2 is the amount of plugging agent, L is the length of the horizontal section, is the degree of fracture development in the horizontal section, representing the number of fractures developed per unit length; D is the fracture width, which is an empirical value; A is the plugging agent spreading width; B is the plugging agent spreading height; and Φ is the effective porosity.

6. A water plugging device for a high water content oil well, characterized in that: The device comprises: An analysis unit, used to obtain reservoir geological information of the target water plugging well, and analyze the cause of water production based on the reservoir geological information; A first determining unit, configured to determine a water blocking strategy based on the water discharge cause; An establishing unit, used for establishing a three-dimensional geological model for the target water plugging well based on the reservoir geological information; A simulation unit is used to simulate and characterize the dynamic water plugging process of the water plugging strategy in a three-dimensional geological model using a physical simulation method, and then simulate the process of oil well water breakthrough, water plugging construction, and post-plugging production of the target water plugging well using a numerical simulation method; A selection unit, used for selecting a plugging agent according to the actual reservoir requirements and on-site construction conditions of the target water plugging well; A second determination unit is used to determine an auxiliary agent of the plugging agent to prepare the plugging agent; A processing unit, used to perform water plugging construction on the target water plugging well using the configured plugging agent according to the simulation process of water plugging construction; The analysis unit is further used for: After analyzing the cause of water production based on the reservoir geological information, the production logging data is analyzed according to the established three-dimensional geological model by using reservoir engineering analysis, physical simulation, and numerical simulation to determine the cause of flooding and water production characteristics of the target water plugging well and determine the target object of water plugging; The method of using reservoir engineering analysis to analyze production logging data includes: obtaining the water drive curve of the target water plugging well and its transformation form, using the water drive curve and its transformation form to perform water production analysis on the sandstone reservoir of the target water plugging well to determine the dynamic law of the reservoir; the reservoir engineering analysis includes the seepage mechanics theory method and the material balance theory method; The physical simulation method is used to analyze the production logging data, including: based on the geological model, under the constraint of similarity criteria, setting a physical model that can reflect the actual characteristics of the target oil reservoir and the target water plugging well, simulating the edge and bottom water or injection water penetration process of the target water plugging well through the physical model, and determining the flooding characteristics of the target water plugging well; The method of using numerical simulation to analyze the production logging data includes: using three-dimensional geological modeling to establish a mathematical model of the oil reservoir and the target water plugging well, and through the numerical simulation method, the bottom water or injected water intrusion process of the target water plugging well to determine the flooding characteristics of the target water plugging well; The production logging data includes at least one of the following: production profile logging, injection profile logging, remaining oil monitoring logging, well testing and its interpretation results.

7. The device according to claim 6, characterized in that The analysis unit is further used for: Obtaining geophysical and reservoir geological information at the location of the target water plugging well, as well as static and dynamic data of the target water plugging well, determining the reservoir conditions and fluid properties of the target water plugging well based on the acquired information, and analyzing the reservoir development characteristics of the target water plugging well; The static data includes at least one of the following: reservoir burial depth, structural characteristics, sedimentary environment, sedimentary rhythm, reservoir physical properties, and fluid properties; The dynamic data may be at least one of the following: reservoir transformation curve, oil well production characteristics, oil well monitoring data, and adjacent well production conditions.

8. The device according to claim 6, characterized in that The selection unit is further used for: Before using the configured plugging agent to carry out water plugging construction on the target water plugging well, according to the water plugging purpose of the target water plugging well and the selection of the plugging agent, a corresponding segment plug combination is selected for the target water plugging well from the segment plug combination design, and the amount of the plugging agent is determined according to the requirements of the plugging depth and strength.

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