Special-shaped cutting tooth optimization method and device and storage medium

Abstract

The invention provides a special-shaped cutting tooth optimal selection method and device and a storage medium, and relates to the technical field of oil and gas drilling engineering.The method comprises the steps that rock breaking optimal and fast judgment and tooth surface structure judgment are conducted on each to-be-selected special-shaped cutting tooth according to the target working condition and the stratum environment, and the to-be-selected special-shaped cutting tooth is obtained; obtaining a first judgment result and a second judgment result of the to-be-selected special-shaped cutting tooth; and according to the first judgment result and the second judgment result, special-shaped cutting teeth suitable for the target working condition and the stratum environment are preferably selected. In this way, the special-shaped cutting teeth suitable for the target working condition and the stratum environment can be preferably selected, the rock breaking efficiency of the PDC drill bit is improved, and the service life of the PDC drill bit is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling engineering, and is applied to multi-dimensional load rock breaking. Specifically, it relates to a method and device for optimizing special-shaped cutting teeth, and a storage medium. Background Art

[0002] With the development of society, people's demand for oil and gas resources is increasing, and oil and gas exploration and development are gradually moving towards deep and ultra-deep layers. During this period, special-shaped cutting tooth technology has been widely used and developed rapidly. However, how to select special-shaped cutting teeth suitable for target working conditions and formation environment is also particularly important.

[0003] At present, simulation and experimental analysis methods are usually used for comparison to obtain the optimal results of special-shaped cutting teeth. In addition, drill bit suppliers and technicians will also obtain the optimal results of special-shaped cutting teeth through empirical analysis based on their understanding of the formation and drill bits.

[0004] In the above schemes, a systematic method for selecting the best-selected special-shaped cutting teeth cannot be formed, and the best-selected special-shaped cutting teeth have poor adaptability to the target working conditions and formation environment, resulting in low rock breaking efficiency and short service life of the special-shaped cutting teeth. Summary of the invention

[0005] In view of the problems of the current prior art, the present invention provides a method, device, and storage medium for selecting a special-shaped cutting tooth, the method comprising:

[0006] According to the target working conditions and formation environment, each candidate special-shaped cutting tooth is respectively evaluated for rock breaking speed and tooth surface structure, and a first evaluation result and a second evaluation result of the candidate special-shaped cutting tooth are obtained;

[0007] According to the first evaluation result and the second evaluation result, the special-shaped cutting teeth suitable for the target working condition and the formation environment are preferably selected.

[0008] Optionally, the rock breaking quality and speed evaluation is performed on each candidate special-shaped cutting tooth according to the target working condition and formation environment to obtain a first evaluation result of the candidate special-shaped cutting tooth, including:

[0009] Acquire a first evaluation factor for optimizing the special-shaped cutting teeth to be selected;

[0010] The candidate special-shaped cutting teeth, the first evaluation factor, and the rock breaking quality and speed evaluation are respectively used as a scheme layer, a criterion layer, and a target layer to establish an evaluation decision model;

[0011] Generating a target evaluation factor scale value of the evaluation decision model;

[0012] According to the target evaluation factor scale value, a first evaluation result of the special-shaped cutting tooth to be selected is determined.

[0013] Optionally, generating the target evaluation factor scale value of the evaluation decision model includes:

[0014] Generate a first judgment matrix of the criterion layer with respect to the target layer and a first evaluation factor scale value of the first judgment matrix, wherein the first evaluation factor scale value is used to characterize the importance of the criterion layer relative to the target layer;

[0015] Generate a second judgment matrix of the solution layer with respect to the criterion layer and a second evaluation factor scale value of the second judgment matrix, wherein the second evaluation factor scale value is used to characterize the importance of the solution layer relative to the criterion layer;

[0016] Determining whether the first judgment matrix and the second judgment matrix meet consistency requirements;

[0017] When it is determined that the first judgment matrix and the second judgment matrix meet the consistency requirement, a target evaluation factor scale value of the evaluation decision model is generated according to the first evaluation factor scale value and the second evaluation factor scale value.

[0018] Optionally, the second evaluation factor scale value includes: a third evaluation factor scale value;

[0019] The generating of the second evaluation factor scale value of the solution layer with respect to the criterion layer comprises:

[0020] Based on the first evaluation factor of the selected special-shaped cutting teeth, an impact rock breaking simulation model is established, wherein the first evaluation factor includes: cutting force, cutting depth, rock breaking volume, and mechanical specific work;

[0021] The scaling value of the third evaluation factor is determined according to the value of the first evaluation factor in the impact rock breaking simulation model.

[0022] Optionally, the second evaluation factor scale value includes: a fourth evaluation factor scale value;

[0023] The generating of the second evaluation factor scale value of the solution layer with respect to the criterion layer comprises:

[0024] The first evaluation factor of the special-shaped cutting tooth to be selected is analyzed to obtain the scale value of the fourth evaluation factor, wherein the first evaluation factor includes: attack structure.

[0025] Optionally, generating a target evaluation factor scale value of the evaluation decision model according to the first evaluation factor scale value and the second evaluation factor scale value includes:

[0026] Based on the first evaluation factor scale value, a third evaluation factor scale value is calculated;

[0027] Based on the second evaluation factor scale value, a fourth evaluation factor scale value is calculated;

[0028] The target evaluation factor scale value is calculated based on the third evaluation factor scale value and the fourth evaluation factor scale value.

[0029] Optionally, the tooth surface structure of each candidate special-shaped cutting tooth is evaluated according to the target working condition and formation environment to obtain a second evaluation result of the candidate special-shaped cutting tooth, including:

[0030] Analyzing the target working condition and the formation environment to obtain a second evaluation factor for evaluating the candidate special-shaped cutting teeth, wherein the second evaluation factor includes: tooth surface structure analysis and tooth surface stress analysis;

[0031] Analyze the tooth surface structure of each of the selected special-shaped cutting teeth to obtain the tooth surface structure function of each of the selected special-shaped cutting teeth, wherein the tooth surface structure includes: an attack structure, a dispersion structure, a heat dissipation structure, and a stabilization structure;

[0032] The tooth surface stress value of each of the selected special-shaped cutting teeth is obtained by simulating the impact rock breaking simulation model;

[0033] Determining the adaptability score of the to-be-selected special-shaped cutting tooth according to the tooth surface structure function and the tooth surface stress value;

[0034] The adaptability score of each of the special-shaped cutting teeth to be selected is determined as the second evaluation result of each of the special-shaped cutting teeth to be selected.

[0035] Optionally, the tooth surface structure of each of the to-be-selected special-shaped cutting teeth is analyzed to obtain the tooth surface structure function of each of the to-be-selected special-shaped cutting teeth, including:

[0036] According to the attack structure, the sharp part of the tooth surface of each of the candidate special-shaped cutting teeth directly facing the rock is analyzed to obtain the attack structure function of each of the candidate special-shaped cutting teeth;

[0037] For the dispersed structure, analyzing the peripheral sector of the attack structure of each of the candidate special-shaped cutting teeth to obtain the dispersed structure function of each of the candidate special-shaped cutting teeth;

[0038] With respect to the heat dissipation structure, the concave or convex part of the tooth surface of each of the special-shaped cutting teeth to be selected is analyzed to obtain the heat dissipation structure function of each of the special-shaped cutting teeth to be selected;

[0039] With respect to the stable structure, the peripheral symmetrical large inclined surface of each of the selected special-shaped cutting teeth is analyzed to obtain the stable structural function of each of the selected special-shaped cutting teeth;

[0040] Based on the attack structural function, the dispersion structural function, the heat dissipation structural function, and the stability structural function, the tooth surface structural function of each of the selected special-shaped cutting teeth is constructed.

[0041] Optionally, the special-shaped cutting teeth that are preferably suitable for the target working condition and the formation environment according to the first evaluation result and the second evaluation result include:

[0042] According to the first evaluation result and the first preset weight value and the second evaluation result and the second preset weight value, the evaluation result corresponding to each of the special-shaped cutting teeth to be selected is calculated;

[0043] According to the order of the evaluation results, the special-shaped cutting teeth suitable for the target working condition and the formation environment are preferably selected.

[0044] Optionally, the special-shaped cutting teeth that are preferably suitable for the target working condition and the formation environment according to the order of the evaluation results include:

[0045] The highest ranked evaluation result is preferably the special-shaped cutting tooth suitable for the target working condition and the formation environment.

[0046] According to another aspect of the present invention, there is also provided a device for optimizing special-shaped cutting teeth, comprising:

[0047] An evaluation module is used to evaluate the rock breaking speed and tooth surface structure of each candidate special-shaped cutting tooth according to the target working conditions and formation environment, and obtain a first evaluation result and a second evaluation result of the candidate special-shaped cutting tooth;

[0048] A determination module is used to preferentially select a special-shaped cutting tooth suitable for the target working condition and the formation environment based on the first evaluation result and the second evaluation result.

[0049] According to another aspect of the present invention, a storage medium is provided, which includes a series of instructions for executing the method steps described in any one of the above.

[0050] The present invention provides a method, device, and storage medium for selecting a special-shaped cutting tooth, which have the following advantages over the prior art:

[0051] According to the target working conditions and formation environment, the rock breaking speed and tooth surface structure of each candidate special-shaped cutting tooth are judged, and the first and second judgment results are obtained respectively. Then, based on the first and second judgment results, the special-shaped cutting teeth suitable for the target working conditions and formation environment are selected. In this way, the special-shaped cutting teeth suitable for the target working conditions and formation environment can be selected, which improves the rock breaking efficiency and service life of the PDC drill bit.

[0052] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0054] Figure 1 A flowchart showing a method for optimizing a special-shaped cutting tooth according to an embodiment of the present invention is shown;

[0055] Figure 2 A flowchart showing a method for optimizing a special-shaped cutting tooth according to another embodiment of the present invention is shown;

[0056] FIG3( a ) shows a schematic diagram of an axe-shaped tooth according to an embodiment of the present invention;

[0057] FIG3( b ) shows a schematic diagram of a triangular tooth according to an embodiment of the present invention;

[0058] FIG3( c ) shows a schematic diagram of an A3 tooth according to an embodiment of the present invention;

[0059] FIG3( d ) shows a schematic diagram of a chisel-shaped tooth according to an embodiment of the present invention;

[0060] FIG3( e ) shows a schematic diagram of a right-angle tooth according to an embodiment of the present invention;

[0061] Figure 4 A schematic diagram of a judgment and decision model provided according to an embodiment of the present invention is shown;

[0062] FIG5( a ) shows the value of cutting force in the impact rock breaking simulation model provided according to one embodiment of the present invention;

[0063] FIG5( b ) shows the value of cutting depth in the impact rock breaking simulation model provided according to an embodiment of the present invention;

[0064] FIG5( c ) shows the value of the rock breaking volume in the impact rock breaking simulation model provided according to an embodiment of the present invention;

[0065] FIG5( d ) shows the value of mechanical specific work in the impact rock breaking simulation model provided according to an embodiment of the present invention;

[0066] Figure 6 A schematic diagram showing a first evaluation result provided according to an embodiment of the present invention;

[0067] FIG. 7( a ) is a schematic diagram showing the stress value of the tooth surface of an axe-shaped tooth provided according to an embodiment of the present invention;

[0068] FIG. 7( b ) is a schematic diagram showing the stress values ​​of the tooth surface of a triangular tooth provided according to an embodiment of the present invention;

[0069] FIG. 7( c ) is a schematic diagram showing the tooth surface stress value of the A3 tooth according to an embodiment of the present invention;

[0070] FIG. 7( d ) is a schematic diagram showing stress values ​​of a chisel tooth surface according to an embodiment of the present invention;

[0071] FIG. 7( e ) is a schematic diagram showing the stress values ​​of the tooth surface of a right-angle tooth provided according to an embodiment of the present invention;

[0072] Figure 8 A schematic diagram showing a preferred device for a special-shaped cutting tooth according to an embodiment of the present invention is shown;

[0073] FIG9( a ) shows the values ​​of cutting forces in the impact rock breaking simulation model and experimental results provided according to an embodiment of the present invention;

[0074] FIG9( b ) shows the value of cutting depth in the impact rock breaking simulation model and experimental results provided according to an embodiment of the present invention;

[0075] FIG9( c ) shows the rock breaking volume value in the impact rock breaking simulation model and the experimental results provided according to an embodiment of the present invention;

[0076] FIG9( d ) shows the value of mechanical specific work in the impact rock breaking simulation model and experimental results provided according to an embodiment of the present invention;

[0077] FIG. 10( a ) shows a tooth surface view of a chisel-shaped tooth provided according to an embodiment of the present invention;

[0078] FIG. 10( b ) shows a tooth surface diagram of a right-angle tooth provided according to an embodiment of the present invention.

[0079] In the accompanying drawings, the same reference numerals are used for the same components. In addition, the accompanying drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0080] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0081] In order to further improve the position of oil and gas reserve replacement and capacity construction, exploration and development have turned to deep and ultra-deep layers, facing more and more technical difficulties, which seriously affect the mechanical drilling speed and development cost of deep hard formations. Among them, speed increase, as an eternal topic, has always been the key to the efficient development of oil and gas resources. In deep and ultra-deep wells, PDC drill bits face problems such as low rock breaking efficiency and short service life. Special-shaped tooth technology and impact-assisted rock breaking technology are widely used. During the drilling process, the combined application of special-shaped tooth technology and impact-assisted rock breaking technology can form a multi-dimensional load acting on the rock, thereby improving the rock crushing efficiency and reducing the occurrence of unexpected vibration of the drill bit, ensuring the stability of the drill bit.

[0082] In the prior art, simulation, experiment, human experience and other methods are usually used to determine the special-shaped cutting teeth. In this way, the determined special-shaped cutting teeth have low adaptability to the target formation, resulting in low rock breaking efficiency and short service life of the special-shaped cutting teeth.

[0083] The present invention is based on the single tooth multi-dimensional load rock breaking simulation analysis, and uses a method combining hierarchical analysis method and empirical method. Figure 1 As shown in the figure, a method for optimizing the selected special-shaped cutting teeth under multi-dimensional loads is established, and the rock breaking effect and tooth surface structure adaptability of the selected special-shaped cutting teeth are evaluated. The optimization result of the special-shaped cutting teeth is obtained by integrating the evaluation results of the two aspects through weight distribution. This method can provide technical support for rock breaking under multi-dimensional loads, and can also provide theoretical support for speeding up rock breaking in deep difficult-to-drill formations.

[0084] In view of the above-mentioned defects of the prior art, the present invention provides a method, device, and storage medium for selecting special-shaped cutting teeth, so that special-shaped cutting teeth suitable for the target working conditions and formation environment can be selected, thereby improving the rock breaking efficiency and service life of the PDC drill bit.

[0085] Figure 2 A flow chart of a method for optimizing the special-shaped cutting teeth provided in this embodiment is shown, and the method includes:

[0086] Step S101, according to the target working condition and formation environment, rock breaking speed evaluation and tooth surface structure evaluation are performed on each candidate special-shaped cutting tooth, and a first evaluation result and a second evaluation result of the candidate special-shaped cutting tooth are obtained.

[0087] For example, the working condition refers to the drilling working condition (such as the operation currently being carried out, and the tools used, etc.). The formation environment describes the properties of the formation lithology, homogeneity, pressure environment, etc. For example, the formation lithology can be granite. According to the target working condition and formation environment, there are many kinds of special-shaped cutting teeth to be selected, such as axe-shaped teeth, triangular teeth, A3 teeth, chisel-shaped teeth and right-angle teeth (as shown in Figure 3 (a)-(e)). Therefore, a special-shaped cutting tooth should be selected from the multiple special-shaped cutting teeth to make the special-shaped cutting tooth more adaptable to the target working condition and formation environment.

[0088] The evaluation of the selected special-shaped cutting teeth can be evaluated from multiple perspectives. The application scenario of this method is the combined effect of special-shaped tooth technology and impact-assisted rock breaking technology under multi-dimensional load. Therefore, it is necessary to judge from the aspects of rock breaking speed and tooth surface structure.

[0089] The rock breaking quality and speed evaluation refers to the evaluation of the rock breaking effect of the selected special-shaped cutting teeth. The tooth surface structure evaluation refers to the evaluation of the anti-destruction effect of the selected special-shaped cutting teeth under the target working conditions and formation environment. This scheme conducts rock breaking quality and speed evaluation and tooth surface structure evaluation on a variety of special-shaped cutting teeth to be selected according to the target working conditions and formation environment, so as to obtain the first evaluation result and the second evaluation result of the special-shaped cutting teeth to be selected.

[0090] Step S102, based on the first evaluation result and the second evaluation result, preferably select the special-shaped cutting teeth suitable for the target working condition and formation environment.

[0091] For example, according to the importance of the first evaluation result and the second evaluation result, the first weight preset value and the second weight preset value can be determined, thereby determining the evaluation result. Afterwards, the evaluation results are sorted according to their size, thereby determining the special-shaped cutting teeth that are suitable for the target working conditions and the formation environment. In this way, the selected special-shaped cutting teeth are more objective and accurate.

[0092] In a possible implementation, according to the target working conditions and formation environment, each candidate special-shaped cutting tooth is evaluated for rock breaking speed, and a first evaluation result of the candidate special-shaped cutting tooth is obtained, including:

[0093] Obtaining a first judging factor for selecting a candidate special-shaped cutting tooth;

[0094] The candidate special-shaped cutting teeth, the first evaluation factor, and the rock breaking quality evaluation are respectively used as the scheme layer, the criterion layer, and the target layer to establish an evaluation decision model.

[0095] Generate the target evaluation factor scale value of the evaluation decision model;

[0096] According to the target evaluation factor scale value, the first evaluation result of the special-shaped cutting tooth to be selected is determined.

[0097] For example, the first evaluation factor can be selected through a large amount of field data and literature research. Of course, the target working conditions and formation environment can also be analyzed to determine what the target working conditions and formation lithology are, and the characteristics that the special-shaped cutting teeth need to have to break the target formation rock (i.e., the first evaluation factor): attack structure, cutting force, cutting depth, rock breaking volume, and mechanical specific work.

[0098] For example, the first evaluation factor for optimizing the candidate special-shaped cutting teeth can be obtained first, and then the relationship between the first evaluation factor, the candidate special-shaped cutting teeth, and the rock breaking quality and speed evaluation can be analyzed, so that the rock breaking quality and speed evaluation is the evaluation target, the first evaluation factor is the evaluation criterion, and the various candidate special-shaped cutting teeth are solutions to achieve the target. Based on this, a judgment decision model is established, such as Figure 4 shown.

[0099] Afterwards, a target judgment matrix can be generated, as shown in Table 1, and then the target judgment factor scale value (i.e., the value in Table 1) of the target judgment matrix can be generated according to the first judgment matrix and the second judgment matrix, so that the first judgment result of the selected special-shaped cutting teeth can be determined according to the target judgment factor scale value. In this way, the first judgment result selected is more accurate.

[0100] Table 1 Target judgment matrix

[0101] Indicator weight Axe-shaped teeth Three-sided teeth A3 teeth Chisel teeth Right angle teeth Attack Structure Cutting force Cutting depth Rock breaking volume Mechanical specific work

[0102] In a possible embodiment, generating a target evaluation factor scale value of the evaluation decision model includes:

[0103] Generate a first judgment matrix of the criterion layer with respect to the target layer and a first judgment factor scale value of the first judgment matrix, wherein the first judgment factor scale value is used to characterize the importance of the criterion layer relative to the target layer;

[0104] Generate a second judgment matrix of the solution layer with respect to the criterion layer and a second judgment factor scale value of the second judgment matrix, wherein the second judgment factor scale value is used to characterize the importance of the solution layer relative to the criterion layer;

[0105] Determine whether the first judgment matrix and the second judgment matrix meet the consistency requirement;

[0106] When it is determined that the first judgment matrix and the second judgment matrix meet the consistency requirement, the target judgment factor scale value of the judgment decision model is generated according to the first judgment factor scale value and the second judgment factor scale value.

[0107] In order to generate Table 1, it is necessary to first generate the first judgment matrix of the criterion layer with respect to the target layer as shown in Table 2, and then determine the first evaluation factor scale value of the criterion layer with respect to the target layer, which can be a value obtained through analysis.

[0108] Table 2 The first judgment matrix of the criterion layer with respect to the target layer

[0109]

[0110] For example, in Table 2, "3" indicates that, compared with two factors, one factor is slightly more important than the other factor, and the numbers represented by other numbers are similar to those above and are not described in detail here.

[0111] Next, several second judgment matrices of the solution layer with respect to the criterion layer can be generated, as shown in Tables 3, 4, 5, 6, and 7. Then, the second judgment factor scale values ​​of the solution layer with respect to the criterion layer can be generated (ie, Tables 3, 4, 5, 6, and 7).

[0112] Table 3 Judgment matrix of attack structure at the scheme level

[0113] Attack Structure Axe-shaped teeth Three-sided teeth A3 teeth Chisel teeth Right angle teeth Axe-shaped teeth Three-sided teeth A3 teeth Chisel teeth Right angle teeth

[0114] Table 4 Judgment matrix of cutting force at the scheme level

[0115]

[0116]

[0117] Table 5 Judgment matrix of cutting depth at the solution level

[0118] Cutting depth Axe-shaped teeth Three-sided teeth A3 teeth Chisel teeth Right angle teeth Axe-shaped teeth Three-sided teeth A3 teeth Chisel teeth Right angle teeth

[0119] Table 6 Judgment matrix of the scheme layer on rock breaking volume

[0120] Rock breaking volume Axe-shaped teeth Three-ribbed teeth A3 teeth Chisel teeth Right angle teeth Axe-shaped teeth Three-sided teeth A3 teeth Chisel teeth Right angle teeth

[0121] Table 7 Judgment matrix of scheme level on mechanical specific work

[0122] Mechanical specific work Axe-shaped teeth Three-ribbed teeth A3 teeth Chisel teeth Right angle teeth Axe-shaped teeth Three-sided teeth A3 teeth Chisel teeth Right angle teeth

[0123] Afterwards, it is necessary to determine whether the scale value of the first evaluation factor and the scale value of the second evaluation factor meet the consistency requirement. The specific steps are as follows:

[0124] First, based on the prior art, the maximum characteristic roots in the first judgment matrix and several second judgment matrices are determined respectively, and then the consistency index CI can be determined based on Formula 1.

[0125] CI = (α-n) / (n-1) Formula 1

[0126] Among them, CI is the consistency index, α is the maximum characteristic root, and n is the total number of evaluation factors.

[0127] Afterwards, the corresponding average random consistency index RI is found, and the consistency ratio CR is calculated based on Formula 2.

[0128] CR=CI / RI Formula 2

[0129] Among them, CI is the consistency index, RI is the average random consistency index, and CR is the consistency ratio.

[0130] If the consistency ratio of the first judgment matrix is ​​less than the target threshold value, such as 0.1, it is determined that the first judgment matrix meets the consistency requirements. If the consistency ratio of the first judgment matrix is ​​greater than or equal to the target threshold value, the first judgment matrix needs to be corrected. The steps for determining whether the second judgment matrix meets the consistency requirements are the same as those for the first judgment matrix, and are not repeated here. Afterwards, the target judgment factor scale value will be generated based on the first judgment factor scale value and the second judgment factor scale value.

[0131] In a possible embodiment, the second evaluation factor scale value includes: a third evaluation factor scale value;

[0132] Generate the second evaluation factor scale value of the solution layer with respect to the criterion layer, including:

[0133] Based on the first evaluation factor of the selected special-shaped cutting teeth, an impact rock breaking simulation model is established. The first evaluation factor includes: cutting force, cutting depth, rock breaking volume, and mechanical specific work;

[0134] According to the value of the first evaluation factor in the impact rock breaking simulation model, the scale value of the third evaluation factor is determined.

[0135] Among them, the scale value of the third evaluation factor is the value in Tables 4, 5, 6, and 7. For example, based on the cutting force, cutting depth, rock breaking volume, and mechanical specific work, an impact rock breaking simulation model can be established, with a drilling pressure of 500N, an impact frequency of 60Hz, a cutter back rake angle of 15°, and an impact force of 450N. For example, based on the size and ratio of each cutting force, cutting depth, rock breaking volume, and mechanical specific work in Figures 5(a)-(d), the scale value of the third evaluation factor can be determined, and the value can be filled in Tables 4, 5, 6, and 7.

[0136] In a possible embodiment, the second evaluation factor scale value includes: a fourth evaluation factor scale value;

[0137] Generate the second evaluation factor scale value of the solution layer with respect to the criterion layer, including:

[0138] The first judging factor of the selected special-shaped cutting teeth is analyzed to obtain the scale value of the fourth judging factor. The first judging factor includes: attack structure.

[0139] Among them, the scale value of the fourth evaluation factor is the value in Table 3. For example, by analyzing the target working conditions and the formation environment, the rock breaking effect of each candidate special-shaped cutting tooth attack structure can be determined from the candidate special-shaped cutting teeth. Then, the rock breaking effect of the candidate special-shaped cutting tooth attack structure can be compared with the rock breaking effects of other candidate special-shaped cutting tooth attack structures to determine the scale value of the fourth evaluation factor in Table 3.

[0140] In a possible embodiment, judging the target judgment factor scale value of the decision model according to the first judgment factor scale value and the second judgment factor scale value includes:

[0141] Based on the scale value of the first evaluation factor, the scale value of the third evaluation factor is calculated;

[0142] Based on the scale value of the second evaluation factor, a scale value of the fourth evaluation factor is calculated;

[0143] The target evaluation factor scale value is calculated based on the third evaluation factor scale value and the fourth evaluation factor scale value.

[0144] After determining the scale value of the first evaluation factor, the first evaluation scale value can be added row by row and normalized to obtain the scale value of the third evaluation factor. For example, as shown in Table 2, the first row can be added and then divided by the value of the sum of all values ​​to obtain the weight of the attack structure. Similarly, the weight of the cutting force, the weight of the cutting depth, the weight of the rock breaking volume, and the weight of the mechanical specific work can be obtained by doing the same processing on the other rows: the weight of the attack structure is 58.573%, the weight of the average tangential force is 19.492%, the weight of the average cutting depth is 9.427%, the weight of the rock breaking volume is 9.427%, and the weight of the mechanical specific work is 3.082%. Fill these values ​​into the indicator weight column in Table 1.

[0145] Similarly, after determining the scale value of the second evaluation factor, the scale values ​​of the second evaluation factor are added row by row and normalized to obtain the scale value of the fourth evaluation factor. For example, as shown in Table 3, the first row can be added and then divided by the value of the sum of all values ​​to obtain the value of the axe-shaped tooth with respect to the attack structure. Similarly, the other rows are treated in the same way, and the scores of the attack structure of the triangular teeth, A3 teeth, chisel teeth, and right-angle teeth can be obtained respectively. The same treatment is performed on each row in Tables 4, 5, 6, and 7, respectively, and the scores of the selected special-shaped cutting teeth with respect to cutting force, cutting depth, rock breaking volume, and mechanical specific work can also be obtained. Fill these values ​​into the corresponding columns in Table 1.

[0146] The third evaluation factor scale value and the fourth evaluation factor scale value are filled into Table 1, so as to form the target evaluation factor scale value.

[0147] After determining the scale value of the target evaluation factor, the first evaluation results of each candidate special-shaped cutting tooth can be obtained by adding the values ​​obtained by multiplying the index weight column in Table 1 with the second, third, fourth, fifth and sixth columns respectively. Figure 6 As shown: right-angle teeth (35.17%), axe-shaped teeth (35.94%), triangular teeth (8.93%), chisel-shaped teeth (13.82%), and A3 teeth (6.14%).

[0148] In a possible embodiment, according to the target working conditions and formation environment, the tooth surface structure of each candidate special-shaped cutting tooth is evaluated respectively to obtain a second evaluation result of the candidate special-shaped cutting tooth, including:

[0149] Analyze the target working conditions and formation environment to obtain the second evaluation factor for evaluating the selected special-shaped cutting teeth, which includes: tooth surface structure analysis and tooth surface stress analysis;

[0150] Analyze the tooth surface structure of each candidate special-shaped cutting tooth to obtain the tooth surface structure function of each candidate special-shaped cutting tooth, the tooth surface structure includes: attack structure, dispersion structure, heat dissipation structure, and stabilization structure;

[0151] Through the simulation of the impact rock breaking simulation model, the tooth surface stress value of each selected special-shaped cutting tooth is obtained;

[0152] According to the tooth surface structure function and tooth surface stress value, the adaptability score of the selected special-shaped cutting teeth is obtained;

[0153] The adaptability score of each candidate special-shaped cutting tooth is determined as the second evaluation result of each candidate special-shaped cutting tooth.

[0154] For example, the target working condition and formation environment can be analyzed to obtain the force required to break the target working condition and formation environment (i.e., the force that the selected special-shaped cutting tooth needs to withstand), so the tooth surface structure and tooth surface stress of the selected special-shaped cutting tooth need to be analyzed.

[0155] For example, the structure of the candidate special-shaped cutting tooth can be analyzed from the aspects of attack structure, dispersion structure, heat dissipation structure, and stability structure, so as to determine the tooth surface structure function of the candidate special-shaped cutting tooth.

[0156] Then, the impact rock breaking simulation model can be used to simulate the force that each candidate special-shaped cutting tooth can withstand when breaking the rock, that is, the tooth surface stress value, as shown in Figure 7 (a)-(e). By integrating the force values ​​of the tooth surface during the whole rock breaking process, it can be found that the tooth surface stresses of the axe-shaped tooth, triangular tooth, A3 tooth, chisel tooth, and right-angle tooth are 100-400MPa, 300-600MPa, 1000-3000MPa, 2000-5000MPa, and 3000-7000MPa, respectively.

[0157] Afterwards, the adaptability scores of the candidate special-shaped cutting teeth can be obtained according to the tooth surface structure function and the tooth surface stress value, and comprehensively according to Table 8; from high to low, they are axe-shaped teeth (0.5), triangular teeth (0.4), A3 teeth (0.3), chisel teeth (0.2), and right-angle teeth (0.1). Then, the adaptability score of each candidate special-shaped cutting tooth can be determined as the second evaluation result of each candidate special-shaped cutting tooth.

[0158] Table 8 Evaluation basis of adaptability score

[0159]

[0160]

[0161] In a possible embodiment, the tooth surface structure of each candidate special-shaped cutting tooth is analyzed to obtain the tooth surface structure function of each candidate special-shaped cutting tooth, including:

[0162] According to the attack structure, the sharp part of the tooth surface of each candidate special-shaped cutting tooth directly facing the rock is analyzed to obtain the attack structure function of each candidate special-shaped cutting tooth;

[0163] For the dispersed structure, the peripheral sector of the attack structure of each candidate special-shaped cutting tooth is analyzed to obtain the dispersed structure function of each candidate special-shaped cutting tooth;

[0164] With respect to the heat dissipation structure, the concave or convex parts of the tooth surface of each candidate special-shaped cutting tooth are analyzed to obtain the heat dissipation structure function of each candidate special-shaped cutting tooth;

[0165] For the stable structure, the symmetrical large inclined surface of the periphery of each candidate special-shaped cutting tooth is analyzed to obtain the stable structural function of each candidate special-shaped cutting tooth;

[0166] The tooth surface structural function of each selected special-shaped cutting tooth is constructed based on the attack structural function, the dispersion structural function, the heat dissipation structural function, and the stability structural function.

[0167] For example, the structure of the candidate special-shaped cutting tooth can be analyzed as shown in Table 9, so as to determine the tooth surface structure function of the candidate special-shaped cutting tooth.

[0168] Table 9 Evaluation table of the selected special-shaped cutting tooth structures

[0169]

[0170] The tooth surface structure functions obtained by analysis are as follows: the attack structure of the axe-shaped tooth and the triangular tooth is a triangular pyramid structure based on the curved surface. The main attack method is a combination of points and lines. The main functions are the edges in front of the tooth surface and the fan surfaces on both sides. They can destroy the weakest tensile strength of the rock and also have good impact resistance. However, in the attack structure of the triangular tooth, the edges have a certain inclination angle, which greatly reduces its aggressiveness. The attack structure of the A3 tooth is a chisel-shaped structure based on the curved surface. The main attack method is line attack. The main functions are the fan surface and concave surface. Therefore, its rock breaking effect is average, and its main function is reflected in cooling and heat dissipation. The attack structure of the chisel-shaped tooth is a convex prism structure, and the attack structure is particularly prominent due to the influence of the fan surface and the sharp surface. Therefore, it has a good ability to eat into rocks, but poor impact resistance. The attack structure of the right-angle tooth is a right-angle triangular pyramid. The attack method of this tooth is point attack. The sharp pyramid tip directly eats into the rock to break the rock. It has very strong aggressiveness, but at the same time, the impact resistance of this tooth is poor. The tooth surface structure function is applicable to all special-shaped cutting teeth.

[0171] In a possible embodiment, according to the first evaluation result and the second evaluation result, the special-shaped cutting teeth suitable for the target working conditions and formation environment are preferably selected, including:

[0172] The evaluation result corresponding to each selected special-shaped cutting tooth is calculated according to the first evaluation result, the first weight preset value and the second evaluation result, and the second weight preset value;

[0173] According to the order of the evaluation results, the special-shaped cutting teeth suitable for the target working conditions and formation environment are preferred.

[0174] For example, the first weight preset value and the second weight preset value can be determined according to the actual application scenario. In this embodiment, due to the existence of the impact effect, the tooth surface structure evaluation is more concerned. Therefore, the weights of the rock breaking speed evaluation and the tooth surface structure evaluation are 40% and 60% respectively, so that the value after multiplying the first evaluation result by the first weight preset value and the result of multiplying the second evaluation result by the second weight preset value can be added to obtain the evaluation result. As shown in Table 10. Afterwards, according to the order of the evaluation results, the special-shaped cutting teeth suitable for the target working conditions and formation environment can be preferred.

[0175] Table 10 Evaluation results of the selected special-shaped cutting teeth

[0176] Tooth shape Axe-shaped teeth Three-ribbed teeth A3 teeth Chisel teeth Right angle teeth Judging Results 0.34 0.21 0.16 0.13 0.15

[0177] In a possible embodiment, according to the order of the evaluation results, the special-shaped cutting teeth suitable for the target working conditions and formation environment are preferably selected, including:

[0178] The highest ranked evaluation result is preferably the special-shaped cutting tooth suitable for the target working condition and formation environment.

[0179] As shown in Table 10, the axe-shaped tooth, which has the highest evaluation result, can be preferably regarded as a special-shaped cutting tooth suitable for the target working condition and formation environment.

[0180] Based on the same inventive concept, a device for optimizing special-shaped cutting teeth is provided in this embodiment. Figure 8 is a block diagram of a device for optimizing special-shaped cutting teeth provided in an embodiment of the present application, such as Figure 8 As shown, the device may include:

[0181] Evaluation module 510, for evaluating the rock breaking speed and tooth surface structure of each candidate special-shaped cutting tooth according to the target working condition and formation environment, and obtaining a first evaluation result and a second evaluation result of the candidate special-shaped cutting tooth;

[0182] The determination module 520 is used to preferably select the special-shaped cutting teeth suitable for the target working conditions and formation environment according to the first evaluation result and the second evaluation result.

[0183] The method for optimizing a special-shaped cutting tooth provided by the present invention can also be used in conjunction with a computer-readable storage medium, on which a computer program is stored, and the computer program is executed to run the method for optimizing a special-shaped cutting tooth. The computer program can run computer instructions, which include computer program codes, which can be in source code form, object code form, executable file, or some intermediate form.

[0184] Computer-readable storage media may include: any entity or device that can carry computer program code, recording media, USB flash drives, mobile hard disks, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0185] It should be noted that the content contained in computer-readable storage media can be appropriately increased or decreased based on the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, based on legislation and patent practices, computer-readable storage media do not include electrical carrier signals and telecommunications signals.

[0186] For example, a micro drill cutting-impact coupled rock breaking experimental device can be used to conduct experiments to verify the accuracy of the embodiment and prove the feasibility of the present invention. The device consists of three parts: a test bench, a control center, and a data acquisition system. It can actively adjust parameters such as impact frequency, impact force, drilling pressure, cutting speed, and cutting tooth back rake angle, and collect data by torque sensors, displacement sensors, and vibration sensors. In the experiment, the parameter collection interval is 0.1ms, and the center distance between the two teeth of the micro drill is 24mm. The torque sensor measures and records the drill string torque in real time. The cutting force of the special-shaped cutting teeth to be selected can be calculated later based on the recorded results; the displacement sensor records the cutting depth of the special-shaped cutting teeth to be selected in real time; and the vibration sensor can record the impact load on the rock. The experiment will record the cutting force, cutting depth, and rock breaking volume. The comparison of the experimental results with the simulation results is shown in Figure 9 (a)-(d).

[0187] In the rock breaking speed evaluation, the results are as follows: from high to low, they are right-angle teeth (50.56%), axe-shaped teeth (36.03%), triangular teeth (7.24%), chisel-shaped teeth (4.66%), and A3 teeth (1.52%).

[0188] In the tooth surface structure evaluation, the results are as follows: from high to low, they are axe-shaped teeth (0.5), triangular teeth (0.4), A3 teeth (0.3), chisel teeth (0.2), and right-angle teeth (0.1).

[0189] The two results are added and normalized to finally determine the result of the special-shaped cutting teeth. It can be seen that the axe-shaped teeth are the special-shaped cutting teeth suitable for the current working conditions and formation lithology.

[0190] After the experiment, the three tooth shapes of axe teeth, triangular teeth, and A3 teeth showed no damage characteristics. The chisel teeth and right-angle teeth (as shown in Figure 10 (a)-(b)) showed serious damage morphology, which also confirmed the analysis of rock breaking speed and tooth surface structure. The damage morphology of chisel teeth and right-angle teeth did not conform to the wear characteristics, and both showed tooth collapse. It can be seen that these two special-shaped cutting teeth are not suitable for impact rock breaking operations.

[0191] In summary, the present invention provides a method, device, and storage medium for selecting a special-shaped cutting tooth, which have the following advantages over the prior art:

[0192] According to the target working conditions and formation environment, the rock breaking speed and tooth surface structure of each candidate special-shaped cutting tooth are judged, and the first and second judgment results are obtained respectively. Then, based on the first and second judgment results, the special-shaped cutting teeth suitable for the target working conditions and formation environment are selected. In this way, the special-shaped cutting teeth suitable for the target working conditions and formation environment can be selected, which improves the rock breaking efficiency and service life of the PDC drill bit.

[0193] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0194] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0195] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0196] Certain terms are used throughout this application document to indicate specific system components. As those skilled in the art will recognize, different names can usually be used to indicate the same components, so this application document is not intended to distinguish those components that are only different in name but not in function. In this application document, the terms "comprise", "include" and "have" are used in an open form, and therefore should be interpreted as meaning "including but not limited to...". In addition, the terms "substantially", "substantially" or "approximately" that may be used in this article relate to the tolerances of the corresponding terms accepted by the industry. The term "coupling" as may be used in this article includes direct coupling and indirect coupling via other components, elements, circuits, or modules, wherein for indirect coupling, the components, elements, circuits, or modules between them do not change the information of the signal but can adjust its current level, voltage level, and / or power level. Inferred coupling (for example, one of the elements is coupled to another element by inference) includes direct and indirect coupling between two elements in the same way as "coupling".

[0197] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0198] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0199] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A method for optimizing special-shaped cutting teeth, characterized in that: The method comprises: According to the target working conditions and formation environment, each candidate special-shaped cutting tooth is respectively evaluated for rock breaking speed and tooth surface structure, and a first evaluation result and a second evaluation result of the candidate special-shaped cutting tooth are obtained; According to the first evaluation result and the second evaluation result, the special-shaped cutting teeth suitable for the target working condition and the formation environment are preferably selected.

2. The method according to claim 1, characterized in that According to the target working conditions and formation environment, each candidate special-shaped cutting tooth is respectively evaluated for rock breaking quality and speed, and a first evaluation result of the candidate special-shaped cutting tooth is obtained, including: Acquire a first evaluation factor for optimizing the special-shaped cutting teeth to be selected; The candidate special-shaped cutting teeth, the first evaluation factor, and the rock breaking quality and speed evaluation are respectively used as a scheme layer, a criterion layer, and a target layer to establish an evaluation decision model; Generating a target evaluation factor scale value of the evaluation decision model; According to the target evaluation factor scale value, a first evaluation result of the special-shaped cutting tooth to be selected is determined.

3. The method according to claim 2, characterized in that The step of generating the target evaluation factor scale value of the evaluation decision model includes: Generate a first judgment matrix of the criterion layer with respect to the target layer and a first evaluation factor scale value of the first judgment matrix, wherein the first evaluation factor scale value is used to characterize the importance of the criterion layer relative to the target layer; Generate a second judgment matrix of the solution layer with respect to the criterion layer and a second evaluation factor scale value of the second judgment matrix, wherein the second evaluation factor scale value is used to characterize the importance of the solution layer relative to the criterion layer; Determining whether the first judgment matrix and the second judgment matrix meet consistency requirements; When it is determined that the first judgment matrix and the second judgment matrix meet the consistency requirement, a target evaluation factor scale value of the evaluation decision model is generated according to the first evaluation factor scale value and the second evaluation factor scale value.

4. The method according to claim 3, characterized in that The second evaluation factor scale value includes: a third evaluation factor scale value; The generating of the second evaluation factor scale value of the solution layer with respect to the criterion layer comprises: Based on the first evaluation factor of the selected special-shaped cutting teeth, an impact rock breaking simulation model is established, wherein the first evaluation factor includes: cutting force, cutting depth, rock breaking volume, and mechanical specific work; The scaling value of the third evaluation factor is determined according to the value of the first evaluation factor in the impact rock breaking simulation model.

5. The method according to claim 3, characterized in that The second evaluation factor scale value includes: a fourth evaluation factor scale value; The generating of the second evaluation factor scale value of the solution layer with respect to the criterion layer comprises: The first evaluation factor of the special-shaped cutting tooth to be selected is analyzed to obtain the scale value of the fourth evaluation factor, wherein the first evaluation factor includes: attack structure.

6. The method according to claim 3, characterized in that The step of generating a target evaluation factor scale value of the evaluation decision model according to the first evaluation factor scale value and the second evaluation factor scale value comprises: Based on the first evaluation factor scale value, a third evaluation factor scale value is calculated; Based on the second evaluation factor scale value, a fourth evaluation factor scale value is calculated; The target evaluation factor scale value is calculated based on the third evaluation factor scale value and the fourth evaluation factor scale value.

7. The method according to claim 1, characterized in that According to the target working conditions and formation environment, the tooth surface structure of each candidate special-shaped cutting tooth is evaluated respectively to obtain the second evaluation result of the candidate special-shaped cutting tooth, including: Analyze the target working condition and the formation environment to obtain a second evaluation factor for evaluating the candidate special-shaped cutting teeth, wherein the second evaluation factor includes: tooth surface structure analysis and tooth surface stress analysis; Analyze the tooth surface structure of each of the selected special-shaped cutting teeth to obtain the tooth surface structure function of each of the selected special-shaped cutting teeth, wherein the tooth surface structure includes: an attack structure, a dispersion structure, a heat dissipation structure, and a stabilization structure; The tooth surface stress value of each of the selected special-shaped cutting teeth is obtained by simulating the impact rock breaking simulation model; Determining the adaptability score of the to-be-selected special-shaped cutting tooth according to the tooth surface structure function and the tooth surface stress value; The adaptability score of each of the special-shaped cutting teeth to be selected is determined as the second evaluation result of each of the special-shaped cutting teeth to be selected.

8. The method according to claim 7, characterized in that The tooth surface structure of each of the selected special-shaped cutting teeth is analyzed to obtain the tooth surface structure function of each of the selected special-shaped cutting teeth, including: According to the attack structure, the sharp part of the tooth surface of each of the candidate special-shaped cutting teeth directly facing the rock is analyzed to obtain the attack structure function of each of the candidate special-shaped cutting teeth; For the dispersed structure, analyzing the peripheral sector of the attack structure of each of the candidate special-shaped cutting teeth to obtain the dispersed structure function of each of the candidate special-shaped cutting teeth; With respect to the heat dissipation structure, the concave or convex part of the tooth surface of each of the special-shaped cutting teeth to be selected is analyzed to obtain the heat dissipation structure function of each of the special-shaped cutting teeth to be selected; With respect to the stable structure, the peripheral symmetrical large inclined surface of each of the selected special-shaped cutting teeth is analyzed to obtain the stable structural function of each of the selected special-shaped cutting teeth; Based on the attack structural function, the dispersion structural function, the heat dissipation structural function, and the stability structural function, the tooth surface structural function of each of the selected special-shaped cutting teeth is constructed.

9. The method according to claim 1, characterized in that The special-shaped cutting teeth suitable for the target working condition and the formation environment are preferably selected according to the first evaluation result and the second evaluation result, including: According to the first evaluation result and the first preset weight value and the second evaluation result and the second preset weight value, the evaluation result corresponding to each of the special-shaped cutting teeth to be selected is calculated; According to the order of the evaluation results, the special-shaped cutting teeth suitable for the target working condition and the formation environment are preferably selected.

10. The method according to claim 9, characterized in that The special-shaped cutting teeth suitable for the target working condition and the formation environment are preferably selected according to the order of the evaluation results, including: The highest ranked evaluation result is preferably the special-shaped cutting tooth suitable for the target working condition and the formation environment.

11. A device for optimizing special-shaped cutting teeth, characterized in that: The method according to any one of claims 1 to 10 is performed, wherein the device comprises: An evaluation module is used to evaluate the rock breaking speed and tooth surface structure of each candidate special-shaped cutting tooth according to the target working conditions and formation environment, and obtain a first evaluation result and a second evaluation result of the candidate special-shaped cutting tooth; A determination module is used to preferentially select a special-shaped cutting tooth suitable for the target working condition and the formation environment based on the first evaluation result and the second evaluation result.

12. A storage medium, characterized in that: It comprises a series of instructions for executing the method steps as claimed in any one of claims 1-10.

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