A cross-linked polymer gel profile control system evaluation method

Abstract

The application discloses a kind of crosslinking polymer gel profile control system preferred evaluation methods, including determining polymer gel profile control system preferred evaluation index;Determine the weight of evaluation index;Determine the calculation method of evaluation index.Based on the comprehensive consideration of technical index and economic index, the adaptability of product to temperature can be quantitatively given, and the adaptability of different manufacturers' products in the block can be conveniently and concisely judged, so as to provide basis for polymer gel profile control system optimization, improve the rationality and efficiency of crosslinking polymer gel system optimization evaluation.

Description

Technical Field

[0001] This invention relates to the field of profile control technology in oil extraction, and particularly to a preferred cross-linked polymer gel profile control system. Background Technology

[0002] Heterogeneous reservoirs are prone to forming dominant water channels during waterflooding development, leading to inefficient or ineffective water circulation. Profile control technology involves injecting profile control agents into water wells to block these dominant channels, adjusting the original seepage field of the waterflooded reservoir, thereby expanding the sweep system of subsequent water injection and achieving the effect of stabilizing oil production and reducing water flow. Therefore, profile control technology has good adaptability in heterogeneous reservoirs. Polymer gel profile control systems are composed of polymers, cross-linking systems, and reinjected water. By adjusting the concentrations of polymers and cross-linking systems, systems of different strengths can be obtained to block different levels of dominant water channels, making them widely applicable. Furthermore, polymer gels have good fluidity before gelation, and after gelation, they can effectively occupy the space of dominant channels, effectively blocking them. Therefore, in recent years, polymer gels have become the most commonly used profile control system in oilfields both domestically and internationally, with approximately 85% of profile control wells using polymer gel profile control systems.

[0003] With the proposal of secondary development of old oilfields, profile control technology has gradually developed from single-well profile control to overall block profile control. Profile control technology is not only used to improve water absorption profile in water-drive oilfield development, but also to adjust the heterogeneity of chemical flooding reservoirs.

[0004] The performance and adaptability of a polymer gel profiling system are commonly evaluated using three metrics: gelation time, gel strength, and 30-day strength retention. When selecting the optimal polymer gel for a specific area, products from different manufacturers, at different temperatures, and at different concentrations are compared to identify the most suitable product.

[0005] Because multiple manufacturers, temperatures, concentrations, and indicators are involved, evaluation results may point to multiple products, making the optimal selection of polymer gel systems difficult. During on-site profiling, it's impractical to use one product at one temperature and another at a different temperature within the same area. Therefore, it's necessary to comprehensively consider multiple evaluation results and rank the different products to facilitate the optimal selection of polymer gel profiling systems on-site. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for the optimal evaluation of cross-linked polymer gel profile control systems. Based on a comprehensive consideration of technical and economic indicators, the adaptability of different profile control systems can be easily and simply evaluated, thereby providing a basis for the optimal selection of polymer gel profile control systems.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for the optimal evaluation of a cross-linked polymer gel profile control system, comprising the following steps:

[0008] A. Determining the optimal evaluation index for polymer gel profile control systems

[0009] A1. Determine technical indicators: including gelation time, gel strength, and 30-day viscosity retention rate, to measure the performance of the polymer gel system from a technical perspective;

[0010] A11. Gel Formation Time: According to the experimental design requirements, polymer gel samples of different concentrations were prepared, and the initial viscosity of the samples was measured. Then, the samples were placed in a constant temperature incubator. The viscosity of the samples was measured at 6 hours, 12 hours, 24 hours, 3 days, 5 days, 7 days, 14 days, 21 days, and 30 days after the samples were placed in the constant temperature incubator. When the sample viscosity first reached or exceeded the specified viscosity, the viscosity was required to exceed 4000 mPa·s for 0.2% concentration samples, 8000 mPa·s for 0.3% concentration samples, 15000 mPa·s for 0.4% concentration samples, and 20000 mPa·s for 0.5% concentration samples. The corresponding observation time was recorded as the gel formation time of the system, denoted as T. The concentrations mentioned are mass percentage concentrations.

[0011] A12. Gel strength: The maximum viscosity measured during the 0-30 day observation period is the gel strength of the system;

[0012] A13. 30-day strength retention rate: The percentage obtained by dividing the viscosity value at constant temperature for 30 days by the gel strength is the 30-day strength retention rate.

[0013] A2. Determine economic indicators: Use the price of the unilateral adjustment system as the economic indicator;

[0014] The price of the single-component profile control system is calculated based on the concentration and unit price of the reagents used in the formulation of the crosslinked polymer gel profile control system, i.e., the price of the single-component profile control system.

[0015] B. Determine the weights of the evaluation indicators.

[0016] The weights for technical indicators range from 0.6 to 0.9, and the weights for economic indicators range from 0.1 to 0.4. The sum of the weights for technical and economic indicators is 1.

[0017] B1. Weighting of Technical Indicators (W) Tec

[0018] Among the technical indicators, three factors are considered comprehensively: gelation time, gel strength, and 30-day viscosity retention rate, ensuring that the sum of these three indicators is 1. Based on the importance of these three indicators, the weight of gelation time ranges from 0.2 to 0.3, using W...T Indicates that the weighting range for gel strength is 0.3-0.4, expressed as W. V This indicates that the 30-day viscosity retention rate is weighted in the range of 0.4-0.5, using W. R express;

[0019] B2. Weighting of Economic Indicators (W) Eoc

[0020] The weights of prices in a unilateral adjustment system are the weights of economic indicators, denoted by W. Eoc express;

[0021] C. Determine the calculation method for evaluation indicators

[0022] C1. Calculation Methods for Technical Indicators

[0023] C11. Calculation method for the gelation time index score C(T)

[0024] The gelation time T should be controlled between 12 and 120 hours. min T represents 12 hours. max The value represents 120 hours. When the gelation time is not within the range of 12 to 120 hours, the gelation time score C(T) is 0; when the gelation time is within the range of 12 to 120 hours, the gelation time score C(T) is 1. The rules for determining the value are as follows:

[0025] Gel formation time values ​​for polymers of different concentrations

[0026]

[0027] C12. Calculation method for the gel strength index score C(V)

[0028] The required gel strength V varies depending on the concentration of the polymer gel sample. For a given concentration, the gel strength of the polymer gel sample should not be lower than the minimum linear value V. min When it is below the lower limit value V min When the gel strength is higher than the high linear value V, C(V) takes the value of 0; max When the gel strength is within [V], C(V) takes the value of 1; when the gel strength is within [V], C(V) takes the value of 1. min V max When the value is between ], it is assigned a value according to the normalization assignment method:

[0029] Gel strength values ​​of polymers at different concentrations

[0030]

[0031] C13 30-day viscosity retention rate score C(R) calculation method

[0032] The required viscosity retention rate R after 30 days is 50%–85%, which is considered acceptable.min This indicates the minimum required viscosity retention rate, which is 50%; R max This indicates the required maximum viscosity retention rate, which is 85%; when the viscosity retention rate after 30 days is less than R... min When the viscosity retention rate is greater than R, C(R) is 0; when the viscosity retention rate is greater than R after 30 days. max When the gel strength is within [R], C(R) takes the value of 1; when the gel strength is within [R], C(R) takes the value of 1. min ,R max When the value is between ], it is assigned a value according to the normalization assignment method:

[0033] Viscosity retention rates of polymer gels at different concentrations after 30 days

[0034]

[0035] C14.p manufacturer's product preparation of c-concentration samples at temperature t: Analysis of technical indicators and calculation methods.

[0036] f(p,c,t)=W T ·C(T)+W V ·C(V)+W R ·C(R)

[0037] In the formula: W T : Indicates the weight of gelation time, dimensionless;

[0038] C(T): represents the gelation time score, dimensionless;

[0039] W V : Indicates the weight of gelation strength, dimensionless;

[0040] C(V): Represents the gel strength score, dimensionless;

[0041] W R : Indicates the 30-day viscosity retention rate weight, dimensionless;

[0042] C(R): represents the viscosity retention score after 30 days, dimensionless;

[0043] C2. Calculation methods for economic indicators

[0044] C21. Price Calculation Method for Unilateral Profile Adjustment System

[0045] Assuming that manufacturer p's polymer gel profile control system is composed of N agents in a certain concentration ratio, where agent i has a concentration of c(i) in g / L and a unit price of agent i of p(i) in yuan / kg, then the unit price P(p,c) of manufacturer p's polymer gel with concentration c can be expressed as:

[0046]

[0047] C22. Calculation Methods for Economic Indicators

[0048] Suppose we want to examine the products of k manufacturers, distributed as p1, p2, ..., p... k Calculate the unit price P(p,c) of the profile control system from each manufacturer at concentration c, and determine the maximum unit price P(c) of the profile control system from the k manufacturers at concentration c. max And the minimum value P(c) min

[0049] P(c) max =max(P(p1,c),P(p2,c),…,P(p k ,c))

[0050] P(c) min =min(P(p1,c),P(p2,c),…,P(p k ,c))

[0051] The economic index score for manufacturer P's product when preparing a polymer gel profile control system at concentration C can be expressed as:

[0052]

[0053] C3. Comprehensive Indicator Technical Methods

[0054] C31. Method for calculating the overall score of a single sample

[0055] The product of manufacturer p was prepared at concentration c and examined at temperature t. The comprehensive score of a single sample was calculated as follows:

[0056] F(p,c,t)=f(p,c,t)·W tec +T(p,c)·W Eoc

[0057] In the formula: F(p,c,t): represents the comprehensive score of manufacturer p for preparing a sample of concentration c at temperature t, which is dimensionless;

[0058] f(p,c,t): represents the technical index score of manufacturer p when preparing a sample of product with concentration c at temperature t;

[0059] W Tec : Indicates the weight of technical indicators;

[0060] T(p,c): represents the economic index score of manufacturer p when preparing a sample of concentration c.

[0061] W Eoc : Indicates the weight of economic indicators;

[0062] C32.p Manufacturer's Product Preparation Method for Calculating Scores of Concentration Samples at Different Temperatures

[0063] Assume manufacturer p prepares samples of product with concentration c and investigates them in constant temperature chambers at different temperatures, denoted as t1, t2, ..., tt. n , in t i The sample score at temperature is F(p,c,t) i The following is the method for calculating the sample score of manufacturer's product c concentration under different temperatures:

[0064]

[0065] C33.p manufacturer's product score calculation method for different concentrations and temperatures

[0066] Assume manufacturer p prepares m samples of its product with concentrations c1, c2, ..., c... m The scores for each concentration sample examined in constant temperature chambers at different temperatures are denoted as F(p,c). i Considering different concentrations and temperatures, the product score calculation method for manufacturer p is as follows:

[0067]

[0068] C4. Preferred cross-linked polymer gel profile control system

[0069] Suppose we examine crosslinked polymer gel profile control systems from k manufacturers, and denot the product scores of each manufacturer as F(p1), F(p2), ..., F(p... k By sorting, product performance can be quantitatively compared among k manufacturers, where a higher score indicates a higher cost-performance ratio.

[0070] The beneficial effects of this invention are: it can quantitatively provide the product's temperature adaptability and the adaptability of products from different manufacturers in different regions, providing a basis for the optimal evaluation of cross-linked polymer gel profile control systems. This improves the rationality and efficiency of the optimal evaluation of cross-linked polymer gel systems. Attached Figure Description

[0071] Figure 1 This is a flowchart of the preferred evaluation method for the cross-linked polymer gel profile control system of the present invention. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0073] like Figure 1As shown, the preferred evaluation method for the crosslinked polymer gel profile control system of the present invention includes the following steps:

[0074] A. Determining the optimal evaluation index for polymer gel profile control systems

[0075] A1. Determine technical indicators: including gelation time, gel strength, and 30-day viscosity retention rate, to measure the performance of the polymer gel system from a technical perspective;

[0076] A11. Gel Formation Time: According to the experimental design requirements, polymer gel samples of different concentrations were prepared, and the initial viscosity of the samples was measured. Then, the samples were placed in a constant temperature incubator. The viscosity of the samples was measured at 6 hours, 12 hours, 24 hours, 3 days, 5 days, 7 days, 14 days, 21 days, and 30 days after the samples were placed in the constant temperature incubator. When the sample viscosity first reached or exceeded the specified viscosity, the viscosity was required to exceed 4000 mPa·s for 0.2% concentration samples, 8000 mPa·s for 0.3% concentration samples, 15000 mPa·s for 0.4% concentration samples, and 20000 mPa·s for 0.5% concentration samples. The corresponding observation time was recorded as the gel formation time of the system, denoted as T. The concentrations mentioned are mass percentage concentrations.

[0077] A12. Gel strength: The maximum viscosity measured during the 0-30 day observation period is the gel strength of the system;

[0078] A13. 30-day strength retention rate: The percentage obtained by dividing the viscosity value at constant temperature for 30 days by the gel strength is the 30-day strength retention rate.

[0079] A2. Determine economic indicators: Use the price of the unilateral adjustment system as the economic indicator;

[0080] The price of the single-component profile control system is calculated based on the concentration and unit price of the reagents used in the formulation of the crosslinked polymer gel profile control system, i.e., the price of the single-component profile control system.

[0081] B. Determine the weights of the evaluation indicators.

[0082] The weights for technical indicators range from 0.6 to 0.9, and the weights for economic indicators range from 0.1 to 0.4. The sum of the weights for technical and economic indicators is 1.

[0083] B1. Weighting of Technical Indicators (W) Tec

[0084] Among the technical indicators, three factors are considered comprehensively: gelation time, gel strength, and 30-day viscosity retention rate, ensuring that the sum of these three indicators is 1. Based on the importance of these three indicators, the weighting range for gelation time is 0.2-0.3, using W... TIndicates that the weighting range for gel strength is 0.3-0.4, expressed as W. V This indicates that the 30-day viscosity retention rate is weighted in the range of 0.4-0.5, using W. R express;

[0085] B2. Weighting of Economic Indicators (W) Eoc

[0086] The weights of prices in a unilateral adjustment system are the weights of economic indicators, denoted by W. Eoc express;

[0087] C. Determine the calculation method for evaluation indicators

[0088] C1. Calculation Methods for Technical Indicators

[0089] C11. Calculation method for the gelation time index score C(T)

[0090] The gelation time T should be controlled between 12 and 120 hours. min T represents 12 hours. max The value represents 120 hours. When the gelation time is not within the range of 12 to 120 hours, the gelation time score C(T) is 0; when the gelation time is within the range of 12 to 120 hours, the gelation time score C(T) is 1. The rules for determining the value are as follows:

[0091] Gel formation time values ​​for polymers of different concentrations

[0092]

[0093] C12. Calculation method for the gel strength index score C(V)

[0094] The required gel strength V varies depending on the concentration of the polymer gel sample. For a given concentration, the gel strength of the polymer gel sample should not be lower than the minimum linear value V. min When it is below the lower limit value V min When the gel strength is higher than the high linear value V, C(V) takes the value of 0; max When the gel strength is within [V], C(V) takes the value of 1; when the gel strength is within [V], C(V) takes the value of 1. min V max When the value is between ], it is assigned a value according to the normalization assignment method:

[0095] Gel strength values ​​of polymers at different concentrations

[0096]

[0097] C13 30-day viscosity retention rate score C(R) calculation method

[0098] The required viscosity retention rate R after 30 days is 50%–85%, which is considered acceptable. minThis indicates the minimum required viscosity retention rate, which is 50%; R max This indicates the required maximum viscosity retention rate, which is 85%; when the viscosity retention rate after 30 days is less than R... min When the viscosity retention rate is greater than R, C(R) is 0; when the viscosity retention rate is greater than R after 30 days. max When the gel strength is within [R], C(R) takes the value of 1; when the gel strength is within [R], C(R) takes the value of 1. min ,R max When the value is between ], it is assigned a value according to the normalization assignment method:

[0099] Viscosity retention rates of polymer gels at different concentrations after 30 days

[0100]

[0101]

[0102] C14.p manufacturer's product preparation of c-concentration samples at temperature t: Analysis of technical indicators and calculation methods.

[0103] f(p,c,t)=W T ·C(T)+W V ·C(V)+W R ·C(R)

[0104] In the formula: W T : Indicates the weight of gelation time, dimensionless;

[0105] C(T): represents the gelation time score, dimensionless;

[0106] W V : Indicates the weight of gelation strength, dimensionless;

[0107] C(V): Represents the gel strength score, dimensionless;

[0108] W R : Indicates the 30-day viscosity retention rate weight, dimensionless;

[0109] C(R): represents the viscosity retention score after 30 days, dimensionless;

[0110] C2. Calculation methods for economic indicators

[0111] C21. Price Calculation Method for Unilateral Profile Adjustment System

[0112] Assuming that manufacturer p's polymer gel profile control system is composed of N agents in a certain concentration ratio, where agent i has a concentration of c(i) in g / L and a unit price of agent i of p(i) in yuan / kg, then the unit price P(p,c) of manufacturer p's polymer gel with concentration c can be expressed as:

[0113]

[0114] C22. Calculation Methods for Economic Indicators

[0115] Suppose we want to examine the products of k manufacturers, distributed as p1, p2, ..., p... k Calculate the unit price P(p,c) of the profile control system from each manufacturer at concentration c, and determine the maximum unit price P(c) of the profile control system from the k manufacturers at concentration c. max And the minimum value P(c) min

[0116] P(c) max =max(P(p1,c),P(p2,c),…,P(p k ,c))

[0117] P(c) min =min(P(p1,c),P(p2,c),…,P(p k ,c))

[0118] The economic index score for manufacturer P's product when preparing a polymer gel profile control system at concentration C can be expressed as:

[0119]

[0120] C3. Comprehensive Indicator Technical Methods

[0121] C31. Method for calculating the overall score of a single sample

[0122] The product of manufacturer p was prepared at concentration c and examined at temperature t. The comprehensive score of a single sample was calculated as follows:

[0123] F(p,c,t)=f(p,c,t)·W Tec +T(p,c)·W Eoc

[0124] In the formula: F(p,c,t): represents the comprehensive score of manufacturer p for preparing a sample of concentration c at temperature t, which is dimensionless;

[0125] f(p,c,t): represents the technical index score of manufacturer p when preparing a sample of product with concentration c at temperature t;

[0126] W Tec : Indicates the weight of technical indicators;

[0127] T(p,c): represents the economic index score of manufacturer p when preparing a sample of concentration c.

[0128] W Eoc : Indicates the weight of economic indicators;

[0129] C32.p Manufacturer's Product Preparation Method for Calculating Scores of Concentration Samples at Different Temperatures

[0130] Assume manufacturer p prepares samples of product with concentration c and investigates them in constant temperature chambers at different temperatures, denoted as t1, t2, ..., tt. n , in t i The sample score at temperature is F(p,c,t) i The following is the method for calculating the sample score of manufacturer's product c concentration under different temperatures:

[0131]

[0132] C33.p manufacturer's product score calculation method for different concentrations and temperatures

[0133] Assume manufacturer p prepares m samples of its product with concentrations c1, c2, ..., c... m The scores for each concentration sample examined in constant temperature chambers at different temperatures are denoted as F(p,c). i Considering different concentrations and temperatures, the product score calculation method for manufacturer p is as follows:

[0134]

[0135] C4. Preferred cross-linked polymer gel profile control system

[0136] Suppose we examine crosslinked polymer gel profile control systems from k manufacturers, and denot the product scores of each manufacturer as F(p1), F(p2), ..., F(p... k By sorting, product performance can be quantitatively compared among k manufacturers, where a higher score indicates a higher cost-performance ratio.

[0137] Example

[0138] The first step is to collect cross-linked polymer gel products, for example, products from manufacturers A, B, and C.

[0139] The second step is to determine the system manufacturers, the concentrations to be tested, and the testing temperatures. For example, determine to test samples from three manufacturers: A, B, and C. Set four testing concentrations of 0.2%, 0.3%, 0.4%, and 0.5%, and three testing temperatures of 40℃, 50℃, and 60℃.

[0140] The third step is to determine the system formulation, as shown in the table below:

[0141] Table 4 System Formulation

[0142]

[0143]

[0144] The fourth step is to prepare cross-linked polymer gel profile control system samples according to the system formulation and conduct an investigation.

[0145] Table 5. Results of System Investigation

[0146]

[0147]

[0148] The fifth step is to calculate the score for the sample at a constant temperature and concentration based on the calculation methods for gelation time, gelation strength, and 30-day viscosity retention.

[0149] Table 6 Calculation Results of Sample Technical Indicator Scores

[0150]

[0151]

[0152] The sixth step is to calculate the price of the single-component cross-linked polymer gel profile control system with different concentrations based on the prices of the reagents from various manufacturers. Then, according to the calculation method above, assign a value between 0 and 1 to the price of the single-component profile control system and determine the economic index score.

[0153] Table 7 Drug Prices

[0154]

[0155]

[0156] Table 8. Price of a single-unit profile control system (Unit: Yuan / cubic meter)

[0157] 0.2 57.6 81 67.75 81 57.6 0.3 86.4 93 97.25 97.25 86.4 0.4 115.2 124 118 124 115.2 0.5 144 155 130 155 130

[0158] Table 9. Calculation results of economic index scores for samples of different concentrations.

[0159] 0.2 1 0 0.57 0.3 1 0.39 0 0.4 1 0 0.68 0.5 0.44 0 1

[0160] The seventh step is to determine the overall score of the sample, the score of the sample at a given temperature, and the score of the sample from a given manufacturer based on the calculation results of the technical index scores of the samples and the economic index scores of samples at different concentrations.

[0161] Table 10 Optimization Evaluation Results

[0162]

[0163]

[0164] The overall score for manufacturer A's system was 0.63, for manufacturer B's system 0.45, and for manufacturer C's system 0.38, indicating that manufacturer A's crosslinked polymer gel product showed better suitability in this market segment. This method can clearly evaluate the suitability of crosslinked polymer gel systems.

[0165] In summary, the content of this invention is not limited to the above-described embodiments. Those skilled in the art can easily propose other embodiments within the technical guiding principles of this invention, but such embodiments are all included within the scope of this invention.

Claims

1. A method for preferential evaluation of cross-linked polymer gel profile control systems, characterized in that, Includes the following steps: A. Determining the optimal evaluation index for polymer gel profile control systems A1. Determine technical indicators: including gelation time, gel strength, and 30-day viscosity retention rate, to measure the performance of the polymer gel system from a technical perspective; A11. Gel Formation Time: According to the experimental design requirements, prepare polymer gel samples of different concentrations, measure the initial viscosity of the samples, and then place them in a constant temperature incubator. Measure the sample viscosity at 6, 12, 24, 3, 5, 7, 14, 21, and 30 days after the samples are placed in the incubator. When the sample viscosity first reaches or exceeds the specified viscosity, the viscosity requirements are: 0.2% concentration sample: over 4000 mPa·s; 0.3% concentration sample: over 8000 mPa·s; 0.4% concentration sample: 15000 mPa·s; 0.5% concentration sample: 20000 mPa·s. Record the corresponding observation time as the gel formation time of the system, denoted as T. The concentrations mentioned are mass percentage concentrations. A12. Gel strength: The maximum viscosity measured during the 0-30 day observation period is the gel strength of the system; A13. 30-day strength retention rate: The percentage obtained by dividing the viscosity value at constant temperature for 30 days by the gel strength is the 30-day strength retention rate. A2. Determine economic indicators: Use the price of the unilateral adjustment system as the economic indicator; The price of the single-component profile control system is calculated based on the concentration and unit price of the reagents used in the formulation of the crosslinked polymer gel profile control system, i.e., the price of the single-component profile control system. B. Determine the weights of the evaluation indicators. The weights for technical indicators range from 0.6 to 0.9, and the weights for economic indicators range from 0.1 to 0.

4. The sum of the weights for technical and economic indicators is 1. B1. Weighting of Technical Indicators W Tec Among the technical indicators, three factors are considered comprehensively: gelation time, gel strength, and 30-day viscosity retention rate, ensuring that the sum of these three indicators is 1. Based on the importance of these three indicators, the weighting range for gelation time is 0.2-0.

3. W T This indicates that the weighting range for gel strength is 0.3-0.4, using... W V This indicates that the 30-day viscosity retention rate weighting range is 0.4-0.5, using... W R express; B2. Weighting of Economic Indicators W Eoc The weights of prices in a unilateral adjustment system are the same as the weights of economic indicators. W Eoc express; C. Determine the calculation method for evaluation indicators C1. Calculation Methods for Technical Indicators C11. Gel formation time score C(T) Calculation method gelation time T It should be controlled between 12 and 120 hours. T min Indicates 12 hours. T max This represents 120 hours. When the gelling time is not within the range of 12 to 120 hours, the gelling time score is given. C(T) The score is 0; when the gelling time is in the range of 12 to 120 hours, the gelling time score is 0. C(T) =1; C12. Rubber strength index score C(V) Calculation method The required gel strength (V) varies depending on the concentration of the polymer gel sample. For a given concentration, the gel strength of the polymer gel sample should not be lower than the minimum linear value. V min When below the lower limit value V min hour, C(V) The value is 0; when the adhesive strength is higher than the high line value. V max hour, C （V） The value is 1; when the adhesive strength is [ V min , V max When the value is between ], it is assigned a value according to the normalization assignment method: Gel strength values ​​of polymers at different concentrations C13 30-day viscosity retention rate score C(R) Calculation method Requirement for 30-day viscosity retention R If 50%~85% is qualified, use R min This indicates the minimum required viscosity retention rate, which is 50%. R max This indicates the required maximum viscosity retention rate, which is 85%; when the viscosity retention rate after 30 days is less than... R min hour, C(R) The value is 0; when the viscosity retention rate after 30 days is greater than R max hour, C(R) The value is 1; when the adhesive strength is [ R min , R max When the value is between ], it is assigned a value according to the normalization assignment method; C14.p manufacturer's product preparation of c-concentration samples at temperature t: Analysis of technical indicators and calculation methods. f(p,c,t)=W T ·C(T)+ W V ·C(V)+ W R ·C(R) In the formula: W T : Indicates the weight of gelation time, dimensionless; C(T) : Indicates the score for gelation time, dimensionless; W V : Indicates the weight of gelation strength, dimensionless; C(V) : Represents the gel strength score, dimensionless; W R : Indicates the 30-day viscosity retention rate weight, dimensionless; C(R) : Represents the viscosity retention rate score over 30 days, dimensionless; C2. Calculation methods for economic indicators C21. Price Calculation Method for Unilateral Profile Adjustment System Assume that manufacturer p's polymer gel profile control system is composed of N agents in a certain concentration ratio, where agent i has a concentration of c(i) in g / L; and the unit price of agent i is p(i) in yuan / kg; then the unit price of manufacturer p's polymer gel at concentration c is... P(p,c) It can be represented as: C22. Calculation Methods for Economic Indicators Suppose we want to examine the products of k manufacturers, with the following distribution: , ... Calculate the price of each manufacturer's single-unit profile control system at concentration c. P(p,c) Determine the maximum price of a single-unit profile control system from k manufacturers when the c concentration is determined. and minimum value The economic index score for manufacturer P's product when preparing a polymer gel profile control system at concentration C can be expressed as: C3. Comprehensive Indicator Technical Methods C31. Method for calculating the overall score of a single sample The product of manufacturer p was prepared at concentration c and examined at temperature t. The comprehensive score of a single sample was calculated as follows: In the formula: : Represents the overall score of a sample of manufacturer p prepared at concentration c at temperature t, dimensionless; : Indicates the score of technical indicators for the preparation of a sample of product with concentration c by manufacturer p at temperature t; : Indicates the weight of technical indicators; : Indicates the score of the economic index for preparing c-concentration samples of manufacturer p's product; : Indicates the weight of economic indicators; C32.p Manufacturer's Product Preparation Method for Calculating Scores of Concentration Samples at Different Temperatures Assume manufacturer p prepares samples of product with concentration c and examines them in constant temperature ovens at different temperatures, denoted as . , ... ,exist The sample score at temperature is The following is the method for calculating the sample score of manufacturer's product c concentration under different temperatures: C33.p manufacturer's product score calculation method for different concentrations and temperatures Assume manufacturer p prepares m samples of its product with concentrations of [missing information]. , ... The scores for each concentration sample tested in constant temperature chambers at different temperatures are recorded as follows: Considering different concentrations and temperatures, the product score calculation method for manufacturer p is as follows: C4. Preferred cross-linked polymer gel profile control system Suppose we examine cross-linked polymer gel profile control systems from k manufacturers, and the product scores for each manufacturer are denoted as follows: By ranking, product performance can be quantitatively compared among k manufacturers, with higher scores indicating higher cost-effectiveness.

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