Hot dry rock reservoir temporary plugging material selection method based on high-temperature force chain strength index

Abstract

The invention relates to the technical field of temporary plugging material selection, in particular to a hot dry rock reservoir temporary plugging material selection method based on a high-temperature force chain strength index, which comprises the following steps of: obtaining relative contact force distribution and cumulative distribution among particles by utilizing a photoelastic image of a crack plugging layer in a pressure bearing process, determining relative contact force classification, and selecting a high-temperature force chain strength index; key parameters of the temporary plugging material are obtained through the strong chain proportion; grading according to the grain shape multi-dimensional index value; calculating entropy weights of the key performance parameters of the temporary plugging material; calculating relative weights of the key performance parameters of the temporary plugging material in different leakage environments; obtaining a weight calculation comprehensive weight by using an AHP and an entropy evaluation method; calculating composite weights of different leakage types according to the comprehensive weight; calculating the strength index of the strong chain according to the composite weight and the leakage type proportion, and selecting the temporary plugging material by using the strength index of the strong chain. The invention solves the problem of lack of temporary plugging material selection for well leakage control of fractured reservoirs in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of temporary plugging material selection, and in particular to a method for selecting temporary plugging materials for hot dry rock reservoirs based on a high-temperature force chain strength index. Background Art

[0002] Well leakage is an important engineering and technical problem that restricts deep and ultra-deep drilling. Well leakage in the reservoir section will seriously hinder the timely discovery, accurate evaluation and efficient development of oil and gas layers, and significantly reduce the production of oil and gas wells. Drilling fluid leakage is the most serious reservoir damage mode in the drilling and completion stages of deep fractured reservoirs. Leakage causes a large amount of solid and liquid phases in the working fluid to invade the reservoir, which can easily induce solid phase plugging damage, fluid sensitive damage, stress sensitive damage and liquid phase closure damage. Moreover, with the increase in the amount of working fluid leakage, the range of the damage zone increases sharply, and is aggravated by the subsequent operation damage.

[0003] The control of leakage in deep fractured reservoirs should not only achieve efficient plugging of fractures during leakage, but also take into account pre-production plugging removal and reservoir protection. Physical bridging temporary plugging materials are the most commonly used materials for reservoir section leakage control, with advantages such as wide sources and convenient construction. However, there are many types of bridging temporary plugging materials with different properties. According to geometric shapes, they can be divided into spherical, flaky, fibrous and irregular shaped materials; according to mechanical properties, they can be divided into rigid, elastic and elastoplastic materials; according to chemical releasability, they can be divided into acid-soluble, self-degradable and inert materials; the effect of bridging temporary plugging materials depends on their Domestic and foreign scholars have conducted a lot of research on the evaluation and optimization of temporary plugging materials for the applicability of drilling fluid loss layer conditions and loss types. They have designed and conducted experiments to explore the influence of the geometric, physical and mechanical properties of temporary plugging materials on the plugging efficiency, and formed a temporary plugging material performance evaluation method. However, the existing evaluation methods are mostly aimed at the evaluation of a single performance parameter of temporary plugging materials. The effect of temporary plugging materials is affected by the comprehensive influence of geometric, physical and mechanical properties. At present, the selection of temporary plugging materials is still based on experience, and there is no temporary plugging material selection method for well leakage control in fractured reservoirs. Summary of the invention

[0004] In view of the shortcomings of the existing methods, the present invention solves the problem in the prior art of lack of temporary plugging material selection for controlling well leakage in fractured reservoirs.

[0005] The technical solution adopted by the present invention is: a method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index comprises the following steps:

[0006] Step 1: using the photoelastic image of the crack plugging layer during the pressure-bearing process to obtain the relative contact force distribution and cumulative distribution between the particles, determining the relative contact force classification based on the relative contact force distribution and cumulative distribution, and obtaining the key parameters of the temporary plugging material through the proportion of the strong force chain;

[0007] As a preferred embodiment of the present invention, several key parameters of temporary plugging materials are obtained in descending order according to the proportion of strong chains.

[0008] As a preferred embodiment of the present invention, the key parameters of the temporary plugging material include: multidimensional index of particle shape, particle size D90 distribution, friction coefficient and D90 degradation rate.

[0009] Step 2: Classify the particles according to their multidimensional index values;

[0010] As a preferred embodiment of the present invention, the formula of the particle shape multidimensional index value is:

[0011] O x =(S R +A R +C x ) / 3 (6)

[0012] Among them, S R is the roundness, and the convexity is C x , A R is the particle slenderness ratio.

[0013] Step 3: Calculate the entropy weight of the key performance parameters of the temporary plugging material;

[0014] As a preferred embodiment of the present invention, step three specifically includes:

[0015] Step 31, normalizing the key performance parameters of the temporary plugging material;

[0016] Step 32, calculating the information entropy of the key performance parameters of the temporary plugging material;

[0017] Step 33, calculating the redundancy of key performance parameters of the temporary plugging material;

[0018] Step 34: Calculate the weight of the key performance parameters of the temporary plugging material using the formula:

[0019]

[0020] in, represents the entropy weight of the jth performance parameter, and n is the number of performance parameters.

[0021] Step 4: Calculate the relative weights of the key performance parameters of temporary plugging materials in different leakage environments;

[0022] As a preferred embodiment of the present invention, step 4 specifically includes:

[0023] Step 41, constructing a judgment matrix of key performance parameters of temporary plugging materials of different leakage types;

[0024] Step 42, checking the consistency of the judgment matrix;

[0025] Step 43, normalize each column of the judgment matrix;

[0026] Step 44, summing the rows of the judgment matrix to construct a component vector group;

[0027] Step 45: Use the sum method to calculate the relative weights of the performance parameters of the temporary plugging material in different leakage environments.

[0028] Step 5: Use AHP and entropy method to obtain weights to calculate comprehensive weights; calculate composite weights of different leakage types based on the comprehensive weights;

[0029] As a preferred embodiment of the present invention, the formula of comprehensive weight is:

[0030]

[0031] Among them, ψ j is the relative weight of the performance parameter, Indicates the entropy weight of the performance parameter.

[0032] As a preferred embodiment of the present invention, the formula of composite weight is:

[0033]

[0034] Among them, a j are the weight coefficients of crack extension type, induced fracture type, and large and medium crack leakage type; W j is the comprehensive weight.

[0035] Step 6: Calculate the strength index of the strong chain according to the composite weight and the proportion of the leakage type, and use the strength index of the strong chain to select the temporary plugging material;

[0036] As a preferred embodiment of the present invention, the formula of the strength chain strength index is:

[0037]

[0038] Among them, W i ′(x) represents the composite weight of the key performance parameters of temporary plugging materials; λ i (x) represents the force chain strength score measurement coefficient of the key performance parameters of the temporary plugging material.

[0039] As a preferred embodiment of the present invention, a system for selecting temporary plugging materials for hot dry rock reservoirs based on the high-temperature force chain strength index includes: a memory for storing instructions executable by a processor; and a processor for executing the instructions to implement a method for selecting temporary plugging materials for hot dry rock reservoirs based on the high-temperature force chain strength index.

[0040] Beneficial effects of the present invention:

[0041] 1. The present invention aims at the fact that there are many types of temporary plugging materials at present, and the selection depends on experience, and there is a lack of basis for the selection of temporary plugging materials; the present invention selects suitable temporary plugging materials in a targeted manner, thereby possibly improving the strength and stability of the hot dry rock plugging layer;

[0042] 2. Based on the force chain characterization experiment of the plugging layer of the plugging material under high temperature environment, four key parameters that control the pressure bearing capacity of the hot dry rock plugging layer are extracted; based on the strong force chain network strength theory and combined with the entropy weight method, the key performance parameter weights of the hot dry rock formation plugging material are used to construct a high-temperature force chain strength index as the basis for the selection of plugging materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a flow chart of a method for selecting temporary plugging materials for hot dry rock reservoirs based on a high temperature force chain strength index according to the present invention;

[0044] Figure 2 It is the photoelastic experiment image of the present invention;

[0045] Figure 3 It is a schematic diagram of the photoelastic image processing process of the present invention. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and embodiments. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore it only shows the components related to the present invention.

[0047] According to the degree of reservoir fracture development, the reservoir can be divided into underdeveloped fracture reservoir, non-leakage-causing natural fracture reservoir, and developed leakage-causing natural fracture reservoir; the drilling fluid loss types corresponding to the above three reservoirs are induced rupture loss, fracture extension loss, and large and medium fracture loss, respectively. The leakage mechanism, plugging mechanism, and leakage prevention and plugging are the key methods of plugging loss channels for reservoirs with developed and connected natural fractures, and its goal is to form a high-strength fracture plugging layer in the fractures; the formation of dry hot rock loss channels can be summarized into two major factors, one is the loss channel naturally formed during the evolution of dry hot rock formations; the other is the loss channel formed due to human disturbance during the drilling process of dry hot rock exploitation. Regardless of whether the loss channel is formed by natural or human factors, its morphology is generally dominated by pore type and fracture type, but there are also a small number of other loss types.

[0048] Taking the medium-deep hot dry rock formations in northern Jiangsu as an example, the main cause of reservoir lost circulation in the study area is fracture extension type loss, supplemented by induced rupture type loss and large and medium-sized fracture loss. The stability of the fracture-sealing layer system is the key to determining the control effect of lost circulation in this deep fractured reservoir.

[0049] like Figure 1As shown, the method for selecting temporary plugging materials for hot dry rock reservoirs based on the high temperature force chain strength index includes the following steps:

[0050] Step 1: using the photoelastic image of the crack plugging layer during the pressure-bearing process to obtain the relative contact force distribution and cumulative distribution between the particles, determining the relative contact force classification based on the relative contact force distribution and cumulative distribution, and obtaining the key parameters of the temporary plugging material through the proportion of the strong force chain;

[0051] Determine the leakage type of the leaking layer, and extract the performance parameters of the temporary plugging material that controls the pressure bearing capacity of the temporary plugging material of the dry hot rock leaking layer based on the characterization experiment of the plugging material plugging layer under high temperature environment;

[0052] According to the requirements of pressure-bearing stability of the microscopic mechanical structure of the fracture plugging layer in the high-temperature and dry environment of the hot dry rock reservoir, the formation conditions in the study area were simulated, and the photoelastic experimental characterization system and equipment were used to uniformly pressurize the temporary plugging material to obtain the photoelastic image;

[0053] like Figure 2 and 3 As shown in the figure, the photoelastic image of the crack plugging layer during the pressure bearing process is obtained in the photoelastic experiment. Establishing the relationship between the photoelastic image and the force between particles is the key to processing the photoelastic image. Considering the large number of particles in the crack plugging layer and the large amount of calculation, the mean square gray gradient G is used. 2 The relationship between the mechanical parameters and optical parameters of the particle system was established by this method. The photoelastic image was introduced into the force chain algorithm to calculate the G of the entire photoelastic image in the particle system. 2 value;

[0054] Suppose the gray value of a pixel (i, j) in the image is I ij , the square gray gradient of the pixel is:

[0055]

[0056] Assuming that there are N pixels in each image, the mean square grayscale gradient of the image is:

[0057]

[0058] Based on the mean square gray gradient method, the G of each pixel is obtained. ij 2 and G of the entire image 2, and then determine the relative contact force (F / Fa) distribution and cumulative distribution; use Matlab to process the image to obtain F / Fa data, and determine the strong force chain, medium force chain and weak force chain according to the relative contact force classification; among them, the strong force chain is F>Fa, the medium force chain is Fa>F>0.5Fa, and the weak force chain is F<0.5Fa; compare the proportion of strong force chains of different temporary plugging material performance parameters, analyze the stability of the strong force chain network in the pressure-bearing instability process of the temporary plugging layer formed by the temporary plugging material, and extract the key parameters of the temporary plugging material that control the pressure-bearing capacity of the temporary plugging layer, that is, statistically analyze the top several temporary plugging material performance parameters with the highest proportion of strong force chains as the key parameters of the temporary plugging material, and take the top four in this implementation; obtain the multidimensional index of particle shape before and after pressure of the plugging material under high temperature and dry environment, particle size D90 distribution, friction coefficient and D90 degradation rate (i.e., compressive capacity); as shown in Table 1.

[0059] Table 1 Key parameters of temporary plugging materials

[0060]

[0061]

[0062] Matlab extracts the pseudo code of the strong chain as follows:

[0063] % Read photoelastic image

[0064] filename="photoelastic image.jpg";

[0065] img = imread(filename);

[0066] %Convert to grayscale image

[0067] gray img = rgb2gray(img); % Use adaptive histogram equalization to enhance image contrast

[0068] enhanced img = adaptithteg(gray img); % Use the Canny algorithm to detect edges in the image

[0069] edges=edge(enhanced img,'canny');

[0070] % Use morphological operations to fill the edges to form a continuous chain structure

[0071] se=strel('disk',2); %Define a circular structure element

[0072] dilated edges = imdilate(edges,se);% dilated edges

[0073] % Use corrosion operation to remove small noise

[0074] eroded edges=imerode(dilated edges,se);

[0075] % Use labels to mark different chain structures [BW, Ll = bwlabel (eroded edges); "Centroid'," Eccentricity'," orientation' stats = regionprops (L, 'Area', MajorAxisLength', 'MinorAxisLength'); % Filter out areas with smaller areas

[0076] min area=100; %Adjust this value according to the actual situation

[0077] large chains=ismember(L,find([stats.Area]>min area)); % Display intermediate results and final results

[0078] figure;

[0079] subplot(2,3,1);

[0080] imshow(img); title('Original image');

[0081] subplot(2, 3, 2);

[0082] imshow(gray img); title('Grayscale image');

[0083] subplot(2, 3, 3);

[0084] imshow(enhanced img); title('Enhanced image');

[0085] subplot(2, 3, 4);

[0086] imshow(edges); title('canny edge detection');

[0087] subplot(2,3,5);

[0088] imshow(dilated edges);

[0089] title('Expanded edge');

[0090] subplot(2, 3, 6);

[0091] imshow(large chains); title('Extracted strong chains');

[0092] Step 2: Conduct a key performance parameter evaluation experiment on temporary plugging materials and classify them according to the multi-dimensional index value of particle shape;

[0093] Experimental tests were conducted on the key parameters of temporary plugging materials. The particle size degradation rate of temporary plugging materials before and after pressurization reflects the compressive strength of temporary plugging materials. The high temperature resistance of temporary plugging materials is represented by the particle size degradation rate of temporary plugging materials before and after high temperature. The particle shape multidimensional index is a comprehensive index of the three parameters of average roundness, slenderness ratio and convexity of temporary plugging particles.

[0094] The calculation process of particle shape multidimensional index is as follows:

[0095] Obtain the average roundness, slenderness ratio, and convexity distribution curves of the granular plugging material, and extract the cumulative distribution curve D 90 Corresponding to the numerical value, calculate the multi-dimensional index of particle shape of temporary plugging material;

[0096] Roundness indicates the degree to which the particle material is close to a circle. The formula for roundness is:

[0097]

[0098] Among them, A p is the average area of ​​particles, mm2; P r is the average circumference of granular material, mm.

[0099] The slenderness ratio is the ratio of particle length to diameter, which reflects the slenderness of the particle. R The formula is:

[0100]

[0101] Among them, D Fmin is the shortest Feret diameter of the particle, mm; D Fmax is the shortest Feret diameter of the particle, mm.

[0102] Convexity is the ratio of the particle projection area to the bounding rectangle area, which plays an important role in reflecting the interlocking effect and friction characteristics of particle materials. The formula for convexity is:

[0103]

[0104] Considering the roundness, slenderness ratio and convexity of the particle leak-proof material, the overall irregularity degree is introduced to evaluate the irregularity degree of the particle leak-proof material. The calculation formula of the particle shape multidimensional index value is:

[0105] O x =(S R +A R +C x ) / 3 (6)

[0106] Classification is carried out according to the multidimensional index value of particle shape;

[0107] Table 2 Grain shape multidimensional index classification

[0108]

[0109]

[0110] The higher the multidimensional index value of the particle shape, the closer it is to a sphere. Adding some plugging particles of other shapes to the plugging particles will have a better plugging effect.

[0111] Step 3: Calculate the entropy weight of the key performance parameters of the temporary plugging material;

[0112] Step 31, normalize the key performance parameters of the temporary plugging material. The data dimensions of each parameter are different, so they need to be standardized first; use the range standardization method (Min-Max standardization) to normalize all data to the interval [0, 1];

[0113] Positive indicators (the bigger the better):

[0114]

[0115] Reverse indicator (the smaller the better):

[0116]

[0117] Among them, X ij is the performance parameter value of the jth item of the ith temporary plugging material, Z ij represents the standardized value, X j,min and X j,max are the minimum and maximum values ​​of the jth performance parameter respectively; in this test, all indicators are regarded as positive indicators.

[0118] Step 32, calculating the information entropy of the key performance parameters of the temporary plugging material;

[0119] According to the specific gravity value p of each performance parameter ij Calculate information entropy. The information entropy formula is:

[0120]

[0121] Among them, H j is the information entropy of the jth performance parameter, and m is the number of types of temporary plugging materials;

[0122] p ij It represents the proportion of the i-th temporary plugging material in the j-th performance parameter, and the formula is:

[0123]

[0124] When p ij = 0, define p ij ln(p ij )=0.

[0125] Step 33: Calculate the redundancy d of the key performance parameters of the jth temporary plugging material j The formula is:

[0126] d j =1-H j (11)

[0127] Step 34: According to the redundancy d j The weights of the key performance parameters of each temporary plugging material are calculated using the following formula:

[0128]

[0129] in, represents the entropy weight of the jth performance parameter, and n is the number of performance parameters;

[0130] The entropy weights of the key performance parameters of temporary plugging materials are shown in Table 3;

[0131] Table 3 Entropy weights of key performance parameters of temporary plugging materials

[0132] parameter Friction coefficient Particle size D90 distribution D90 degradation rate Particle shape multidimensional index Weight (%) 0.22 0.29 0.26 0.24

[0133] Step 4: Calculate the relative weights of the key performance parameters of temporary plugging materials in different leakage environments;

[0134] Step 41, constructing a judgment matrix of key performance parameters of temporary plugging materials of different leakage types;

[0135] Based on the field test data, indoor test results and the experience of experts and engineers, a more refined judgment matrix of key performance parameters of temporary plugging materials for different leakage types in hot dry rock formations is constructed by introducing network structure information.

[0136] Table 4 Crack extension type leakage judgment matrix

[0137]

[0138] Table 5 Induced rupture type leakage judgment matrix

[0139]

[0140]

[0141] Table 6 Large and medium-sized natural fracture leakage

[0142] Performance parameters Particle size D90 Friction coefficient Stress resistance Particle shape multidimensional index Particle size D90 1 3 3 4 Friction coefficient 1 / 3 1 3 2 Stress resistance 1 / 3 1 / 3 1 1 / 2 Particle shape multidimensional index 1 / 4 1 / 2 2 1

[0143] Step 42: Check the consistency of the judgment matrix; the calculation formula of CR is:

[0144]

[0145] Among them, λ max The CI value of the maximum eigenvalue measures the consistency of the judgment matrix; n represents the matrix order.

[0146] After calculation, the CRs of the four types of leakage are all less than 0.1, with good consistency;

[0147] Step 43: For the judgment matrix [a ij ] nxn Each column of is normalized to obtain the matrix [b ij ] nxn , the formula is:

[0148]

[0149] Among them, i, j = 1, 2, 3,…, n.

[0150] Step 44, press the matrix [b ij ] nxn The row summation is m j , and m j The vector group M is composed of the following formula:

[0151]

[0152] M=[m1,m2,m3,…,m i …,m n ] (17)

[0153] Step 45: Use the sum method to calculate the relative weights ψ of the performance parameters of the temporary plugging material in different leakage environments i ;

[0154] ψ j =[ψ1,ψ2,ψ3,…,ψ i …,ψ n ] (18)

[0155] Table 7 AHP weights of temporary plugging material performance parameters

[0156]

[0157] Step 5: Use AHP and entropy method to obtain weights to calculate comprehensive weights; calculate composite weights of different leakage types based on the comprehensive weights;

[0158] The formula for the comprehensive weight is:

[0159]

[0160] Table 8 Comprehensive weights of key performance parameters of temporary plugging materials

[0161]

[0162] According to the comprehensive weight, hot dry rock formations with different leakage types have different emphases on the performance requirements of temporary plugging materials; in hot dry rock reservoirs, the primary factor of concern for fracture extension and fracture extension leakage is the particle size D90 distribution, followed by the friction coefficient and the multidimensional index of particle shape; while the induced fracture leakage should first consider the friction coefficient of the temporary plugging material, followed by the particle size D90 distribution and the multidimensional index of particle shape, and the maintenance of compressive resistance cannot be ignored for the three leakage types.

[0163] Due to the complexity of reservoir fracture leakage types, when selecting temporary plugging materials, a certain proportion of different types should be given; the target experimental area is dominated by fracture extension leakage, supplemented by induced rupture leakage and large and medium-sized fracture leakage. The composite weight is calculated using the formula:

[0164]

[0165] Among them, a j They are the weight coefficients of crack extension type, induced fracture type, and large and medium crack leakage type;

[0166] The coefficients assigned to the fracture extension type, induced fracture type, and large and medium fracture leakage type are a1:a2:a3=6:3:1. According to Table 8, the composite weights in Table 9 are obtained.

[0167] Table 9 Composite weights of key performance parameters of temporary plugging materials

[0168] Particle size D90 Friction coefficient Stress resistance Particle shape multidimensional index 36.30 31.76 10.03 21.92

[0169] Step 6: After comparing and scoring the parameters of different materials through experiments, the strength index of the strong chain is calculated according to the composite weight and the proportion of the leakage type;

[0170] The formula for the strength index S of the force chain is:

[0171]

[0172] Among them, W i ′(x) represents the composite weight of the key performance parameters of temporary plugging materials; λ i(x) represents the force chain strength score measurement coefficient of the key performance parameters of the temporary plugging material;

[0173] Table 10 Force chain strength scoring coefficients of key performance parameters of temporary plugging materials

[0174] Standard value 10 8 6 4 2 Particle size D90 high Medium to high medium Medium to low Low Friction coefficient high Medium to high medium Medium to low Low Stress resistance high Medium to high medium Medium to low Low Particle shape multidimensional index Medium to high medium high Medium to low Low

[0175] Table 11 Strength index of strong chain

[0176]

[0177]

[0178] The key parameter data of the sample materials extracted from the force chain network were referred to the scoring table and calculated with composite weights to obtain the final high-temperature force chain strength index. Two materials, S=8.22 and S=8.07, were selected to be suitable for the leaking strata in the study area, while the temporary plugging materials previously matched according to expert experience scored only 6.71. Subsequently, the two selected temporary plugging materials and the original temporary plugging materials were tested for their plugging effects on the spot. The results showed that the plugging effects of the selected temporary plugging materials were nearly 30% higher than those of the commonly used temporary plugging materials.

[0179] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index, characterized in that: The following steps are involved: Step 1: using the photoelastic image of the crack plugging layer during the pressure-bearing process to obtain the relative contact force distribution and cumulative distribution between the particles, determining the relative contact force classification based on the relative contact force distribution and cumulative distribution, and obtaining the key parameters of the temporary plugging material through the proportion of the strong force chain; Step 2: Classify the particles according to their multidimensional index values; Step 3: Calculate the entropy weight of the key performance parameters of the temporary plugging material; Step 4: Calculate the relative weights of the key performance parameters of temporary plugging materials in different leakage environments; Step 5: Use AHP and entropy method to obtain weights and calculate comprehensive weights; Calculate the composite weights of different types of loss based on the comprehensive weights; Step 6. Calculate the strength index of the strong chain according to the composite weight and the proportion of leakage types, and use the strength index of the strong chain to select temporary plugging materials.

2. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 1, characterized in that: Several key parameters of temporary plugging materials are obtained in descending order according to the proportion of strong chains.

3. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 2, characterized in that: The key parameters of temporary plugging materials include: multi-dimensional index of particle shape, particle size D90 distribution, friction coefficient and D90 degradation rate.

4. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 1, characterized in that: The formula for the particle shape multidimensional index value is: O x =(S R +A R +C x ) / 3 (6) Among them, S R is the roundness, and the convexity is C x , A R is the particle slenderness ratio.

5. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 1, characterized in that: Step three specifically includes: Step 31, normalizing the key performance parameters of the temporary plugging material; Step 32, calculating the information entropy of the key performance parameters of the temporary plugging material; Step 33, calculating the redundancy of key performance parameters of the temporary plugging material; Step 34: Calculate the weight of the key performance parameters of the temporary plugging material using the formula: in, represents the entropy weight of the jth performance parameter, and n is the number of performance parameters.

6. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 1, characterized in that: Step 4 specifically includes: Step 41, constructing a judgment matrix of key performance parameters of temporary plugging materials of different leakage types; Step 42, checking the consistency of the judgment matrix; Step 43, normalize each column of the judgment matrix; Step 44, summing the rows of the judgment matrix to construct a component vector group; Step 45: Use the sum method to calculate the relative weights of the performance parameters of the temporary plugging material in different leakage environments.

7. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 1, characterized in that: The formula for the comprehensive weight is: Among them, ψ j is the relative weight of the performance parameter, Indicates the entropy weight of the performance parameter.

8. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 7, characterized in that: The formula for compound weight is: Among them, a j are the weight coefficients of crack extension type, induced fracture type, and large and medium crack leakage type; W j is the comprehensive weight.

9. The method for selecting temporary plugging materials for hot dry rock reservoirs based on high temperature force chain strength index according to claim 8, characterized in that: The formula for the strength index of the strong chain is: Among them, W i ′(x) represents the composite weight of the key performance parameters of temporary plugging materials; λ i (x) represents the force chain strength score measurement coefficient of the key performance parameters of the temporary plugging material.

10. A temporary plugging material selection system for hot dry rock reservoirs based on high temperature force chain strength index, characterized in that: include: a memory for storing instructions executable by a processor; A processor, used to execute instructions to implement the method for selecting temporary plugging materials for hot dry rock reservoirs based on the high-temperature force chain strength index as described in any one of claims 1 to 9.

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