Rock mass integrity evaluation method and system based on digital drilling test technology

Abstract

The present invention belongs to the field of rock mass property determination, and provides a rock mass integrity evaluation method and system based on digital drilling test technology, including obtaining drilling parameters and drill bit size parameters during drilling; based on the force analysis of the drill bit and the rock during drilling and the rock cutting energy theory, constructing the theoretical relationship between drilling speed and drilling pressure, rotation speed and drill bit size parameters; based on the theoretical relationship between drilling speed and drilling pressure, rotation speed and drill bit size parameters, constructing a normalized expression parameter of drilling speed that filters out the influence of drilling pressure and rotation speed, that is, a rock mass integrity index; using a drill bit to carry out drilling tests on rock masses with different integrity, constructing a database for comparing the rock mass integrity index value with the actual integrity of the rock mass; determining the classification correspondence between the rock mass integrity index and the rock mass integrity based on the compared database, and realizing the quantitative evaluation of the rock mass integrity. The present invention eliminates the influence of various factors on the drilling speed and establishes a reasonable evaluation index-rock mass integrity index.

Description

Technical Field

[0001] The invention belongs to the technical field of rock mass property determination, and in particular relates to a rock mass integrity evaluation method and system based on digital drilling test technology. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Rock mass quality evaluation can generally reflect the quality of various types of engineering rock mass in underground engineering construction and predict possible rock mass mechanics problems. Rock mass integrity is an important indicator for evaluating rock mass quality. Quantitative evaluation of rock mass integrity provides an accurate quantitative measurement of rock structure, stability and reliability, which is of great significance to engineering, geology and environment. Scholars have proposed many methods for evaluating rock mass integrity, representative of which are: structural surface statistics method, represented by volume joint number Jv; acoustic wave test method, represented by rock mass integrity coefficient Kv; drilling core method, represented by rock quality index RQD. However, in the actual engineering application process, these methods and indicators often have problems such as large errors, long time consumption, high cost, poor representativeness and dependence on engineer experience. Jv does not consider the influence of crack ductility on rock mass integrity, Kv is greatly affected by human subjective factors when characterizing rock mass integrity, and ROD is not arbitrarily directional and is time-consuming and costly.

[0004] The drilling process is a process of interaction between the drill and the rock mass, and the drill response information contains a large amount of rock mass information. Digital drilling test technology can monitor and record a variety of drilling parameters during the drilling process. By interpreting these drilling parameters, the properties of the rock mass can be quickly understood through the drilling process, which can provide a new way to quickly obtain the geological characteristics of the engineering rock mass. However, the traditional lithology integrity evaluation method based on digital drilling test technology often uses a drilling parameter such as drilling speed as the only evaluation criterion. However, due to the influence of drilling pressure, drilling torque and drill bit speed, the drilling speed is not a constant. Therefore, the evaluation results cannot accurately reflect the integrity of the lithology. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a rock integrity evaluation method and system based on digital drilling test technology. The present invention eliminates the influence of various factors on drilling speed and establishes a more reasonable evaluation index - rock integrity index.

[0006] According to some embodiments, a first solution of the present invention provides a rock integrity evaluation method based on digital drilling testing technology, which adopts the following technical solution:

[0007] Rock mass integrity evaluation methods based on digital drilling testing technology include:

[0008] Obtain drilling parameters and drill bit size parameters during drilling;

[0009] Based on the force analysis of the drill bit and the rock during drilling and the rock-cutting energy theory, the theoretical relationship between drilling speed and drilling pressure, rotation speed and drill bit size parameters is established;

[0010] Based on the theoretical relationship between drilling pressure, rotation speed and drill bit size parameters, a normalized expression parameter of drilling speed is constructed to filter out the influence of drilling pressure and rotation speed, namely, the rock integrity index.

[0011] Drilling tests were carried out using drill bits in rock masses with different integrity levels, and a database was constructed to compare the rock mass integrity index values ​​with the actual rock mass integrity;

[0012] The classification correspondence between the rock mass integrity index and the rock mass integrity is determined based on the compared database to achieve quantitative evaluation of the rock mass integrity.

[0013] Further, the drilling parameters include drilling pressure, drilling torque, rotation speed and drilling speed;

[0014] The drill bit size parameters include drill bit radius, drill bit cutting tooth inclination angle and cutting tooth width.

[0015] Furthermore, based on the force analysis of the coring drill bit and the rock during the drilling process and the rock-cutting energy theory, a theoretical relationship between the drilling speed and the drilling pressure, the rotation speed and the drill bit size parameters is constructed, which is specifically:

[0016] The force analysis of the single tooth of the drill bit as a rock breaking cutting unit is carried out to determine the force on the cutting tooth during the rock breaking process of the drill bit;

[0017] According to the limit balance principle, the theoretical relationship between torque, drilling pressure and drill bit size parameters is determined;

[0018] According to the rock-breaking energy theory, it is determined that the energy of the drill bit to break the rock comes from the work done by the drilling pressure and the work done by the cutting force;

[0019] According to the relationship between drilling pressure, drilling torque, rotation speed and drilling speed and the work done by drilling pressure and cutting force, the theoretical relationship of drilling speed with respect to drilling pressure, rotation speed and drill bit size parameters is determined.

[0020] Furthermore, according to the limit balance principle, the theoretical relationship between torque, drilling pressure and drill bit size parameters is determined as follows:

[0021] ;

[0022] The drill bit radius is R , the inclination angle of the drill bit cutting teeth isθ , the friction angle between rock and drill bit cutting teeth is α , cutting tooth width is L The sliding friction coefficient of rock is μ , torque M , drilling pressure F .

[0023] Furthermore, the theoretical relationship between the drilling speed and the drilling pressure, rotation speed and drill bit size parameters is specifically:

[0024] ;

[0025] Among them, the energy consumed by the drill bit to break a unit volume of rock is ω b , the inclination angle of the drill bit cutting teeth is θ , the friction angle between rock and drill bit cutting teeth is α , cutting tooth width is L , drilling speed V、 Drilling pressure F and speed N ,definition .

[0026] Furthermore, the rock mass integrity index is specifically:

[0027] ;

[0028] in, C 1 and C 2 is a constant, which is a parameter related to rock strength, drilling speed V， Drilling pressure F and speed N .

[0029] Furthermore, the drilling test of rock masses with different integrity is carried out using a drill bit to construct a database for comparing the rock mass integrity index value with the actual integrity of the rock mass, specifically:

[0030] Drilling tests were carried out using P drill bits in rock masses with different integrity;

[0031] By obtaining the drilling parameters, drill bit parameters and the energy consumed by the drill bit to break a unit volume of rock corresponding to different integrity levels, the corresponding rock integrity index value is finally calculated.

[0032] Using the above calculation results, a database is constructed to compare different rock mass integrity index values ​​with the actual integrity of the corresponding rock mass.

[0033] According to some embodiments, a second solution of the present invention provides a rock integrity evaluation system based on digital drilling testing technology, which adopts the following technical solution:

[0034] The rock integrity evaluation system based on digital drilling test technology includes:

[0035] A data acquisition module is configured to obtain drilling parameters and drill bit size parameters during the drilling process;

[0036] The data relationship analysis module is configured to construct a theoretical relationship between drilling speed and drilling pressure, rotation speed and drill bit size parameters based on the force analysis of the drill bit and the rock during the drilling process and the rock cutting energy theory;

[0037] The evaluation index determination module is configured to construct a normalized expression parameter of drilling speed that removes the influence of drilling pressure and rotation speed, namely, the rock mass integrity index, based on the theoretical relationship between drilling pressure, rotation speed and drill bit size parameters;

[0038] A test comparison module is configured to conduct drilling tests on rock masses with different integrity using a drill bit, and to build a database for comparing rock mass integrity index values ​​with actual rock mass integrity;

[0039] The analysis and evaluation module is configured to determine the classification correspondence between the rock mass integrity index and the rock mass integrity according to the compared database, so as to realize the quantitative evaluation of the rock mass integrity.

[0040] According to some embodiments, a third aspect of the present invention provides a computer-readable storage medium.

[0041] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the rock mass integrity evaluation method based on digital drilling testing technology as described in the first aspect above.

[0042] According to some embodiments, a fourth aspect of the present invention provides a computer device.

[0043] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps in the rock mass integrity evaluation method based on digital drilling testing technology as described in the first aspect above are implemented.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention eliminates the influence of various factors on the drilling speed and establishes a more reasonable evaluation index - rock integrity index; the numerical change trend of the rock integrity index can comprehensively reflect the degree of rock fragmentation, and can obtain the rock integrity through information methods and data calculations, thereby reducing the complicated processes such as manual statistics and compilation of core columnar sketches, and reducing the adverse effects of human subjective factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0047] Figure 1 is a flow chart of a rock mass integrity evaluation method based on digital drilling testing technology in an embodiment of the present invention;

[0048] Figure 2 It is a force analysis diagram of a single tooth rock breaking of a PDC drill bit in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0053] Embodiment 1

[0054] This embodiment provides a rock mass integrity evaluation method based on digital drilling test technology. In this embodiment, the method includes the following steps:

[0055] Obtain drilling parameters and drill bit size parameters during drilling;

[0056] Based on the force analysis of the drill bit and the rock during drilling and the rock-cutting energy theory, the theoretical relationship between drilling speed and drilling pressure, rotation speed and drill bit size parameters is established;

[0057] Based on the theoretical relationship between drilling pressure, rotation speed and drill bit size parameters, a normalized expression parameter of drilling speed is constructed to filter out the influence of drilling pressure and rotation speed, namely, the rock integrity index.

[0058] Drilling tests were carried out using drill bits in rock masses with different integrity levels, and a database was constructed to compare the rock mass integrity index values ​​with the actual rock mass integrity;

[0059] The classification correspondence between the rock mass integrity index and the rock mass integrity is determined based on the compared database to achieve quantitative evaluation of the rock mass integrity.

[0060] like Figure 1 As shown, the method includes:

[0061] Obtain drilling parameters and drill bit size parameters during drilling;

[0062] According to the force analysis of the drill bit and the rock during drilling, based on the rock cutting theory, a theoretical expression of drilling speed related to drilling pressure, rotation speed and drill bit parameters is established;

[0063] According to the obtained drilling parameters and drill bit size parameters and the established calculation model, a normalized parameter of drilling speed was defined: rock mass integrity index (RMII), which is used for quantitative evaluation of rock mass integrity.

[0064] In this embodiment, the drilling parameters include drilling pressure, drilling torque, rotation speed and drilling speed, which can be obtained through relevant sensors and a drilling parameter acquisition system.

[0065] The drill bit adopts PDC coring drill bit, and the drill bit size parameters include drill bit radius, drill bit cutting tooth inclination angle and cutting tooth width. Specifically, the drill bit cutting tooth width and drill bit radius can be measured by vernier caliper, and the cutting angle between the cutting tooth and the rock surface can be measured by protractor.

[0066] The process of establishing the theoretical expression of drilling speed with respect to drilling pressure, rotation speed and drill bit parameters is as follows:

[0067] (1) For the force analysis of a single PDC cutter as a rock-breaking cutting unit, the generalized force model is as follows: Figure 2 shown.

[0068] During the rock breaking process of the PDC drill bit, the forces on the cutting teeth include: 1. The vertical drilling pressure on the contact surface between the drill bit and the rock; 2. F ,② Cutting force in the horizontal direction of the contact surface between the drill bit and the rock T , ③ Friction between the bottom surface of the drill bit cutting teeth and the rock f ④ Resistance between the drill bit and the rock cutting surface F c .

[0069] Assume that the PDC drill bit radius is R , the cutting tooth inclination angle of the PDC drill bit is θ , the friction angle between rock and PDC drill bit cutting teeth is α , cutting tooth width is L The sliding friction coefficient of rock is μ According to the limit equilibrium principle, we have:

[0070] (1);

[0071] And because:

[0072] (2);

[0073] (3);

[0074] The torque M and drilling pressure F The following relationship is derived:

[0075] (4);

[0076] (2) According to the rock-breaking theory, the energy of the drill bit to break the rock comes from the work done by the drilling pressure. W F and the work done by the cutting force W T Most of this energy is used to break the rock, but part of it is consumed by the friction between the drill bit cutting teeth and the rock. Assuming that the energy required to break the rock is E b , the friction work between the drill bit cutting teeth and the rock is W f , then:

[0077] (5);

[0078] In the digital drilling test, the drilling pressure can be collected F , drilling torque M , rotation speed N and drilling speed V , a total of 4 drilling parameters. At the same time, assuming that the drilling time is t , then:

[0079] (6);

[0080] (7);

[0081] pass Figure 2 It can be seen that the friction between the drill bit cutting teeth and the rock is divided into two parts. One part is the friction between the bottom surface of the drill bit cutting teeth and the rock. f 1 part is the work done, and the other part is the friction between the side of the drill bit cutting teeth and the rock f2 Work done. Based on actual drilling tests, it can be found that in the actual drilling process, since the pressure between the side of the cutting tooth and the rock is very small, it only occurs when the drilling speed is high and the drill pipe shakes unstably, so the friction force f 2 The work done is compared to f 1 can be ignored, then we have

[0082] (8);

[0083] Combining formulas (4) and (8), we have:

[0084] (9);

[0085] Combining formulas (6), (7) and (9), the energy actually used to break the rock is E b It can be expressed as:

[0086] (10);

[0087] The energy consumed by the drill bit to break a unit volume of rock is defined as ω b ,but ω b It can be expressed as:

[0088] (11);

[0089] definition , then:

[0090] (12);

[0091] In the formula, α The size of is determined by the drill bit size and can be regarded as a constant when the drill bit is determined.

[0092] Drilling speed V It can be expressed as:

[0093] (13);

[0094] For the same type of rock, the energy consumed by the drill bit to break a unit volume of rock is fixed, so ω b is a fixed value and can be regarded as a constant. From equations (4) and (13), it can be seen that the drilling speed V Is subject to torque M , drilling pressure F and speed N of common influence.

[0095] To filter out F ,N and M right V The influence of rock mass integrity index (RMII) is proposed as a normalized parameter for drilling speed. RMII is defined as:

[0096] (14);

[0097] in, C 1 and C 2 is a constant, which is a parameter related to rock strength. When the drilling pressure and drill bit speed change, the drilling speed has a large discreteness. The rock integrity index is a very stable value in homogeneous materials. Therefore, using RMII to express rock integrity is obviously more reasonable than traditional drilling speed.

[0098] The drilling test of rock masses with different integrity is carried out using a drill bit to build a database for comparing the rock mass integrity index value with the actual integrity of the rock mass, specifically:

[0099] Drilling tests were carried out using P drill bits in rock masses with different integrity;

[0100] By obtaining the drilling parameters, drill bit parameters and the energy consumed by the drill bit to break a unit volume of rock corresponding to different integrity levels, the corresponding rock integrity index value is finally calculated.

[0101] Using the above calculation results, a database is constructed to compare different rock mass integrity index values ​​with the actual integrity of the corresponding rock mass.

[0102] A large number of drilling tests of rock masses with different integrity were carried out using PDC coring bits. The drilling parameters, drill bit parameters and the energy consumed by the drill bit to break a unit volume of rock were obtained. ω b Finally, the RMII value is calculated, and a database of RMII value and actual rock mass integrity is constructed. By comparing the RMII value with the actual rock mass integrity and establishing an empirical relationship between the two, the quantitative evaluation of rock mass integrity is finally achieved.

[0103] Embodiment 2

[0104] This embodiment provides a rock mass integrity evaluation system based on digital drilling test technology, including:

[0105] A data acquisition module is configured to obtain drilling parameters and drill bit size parameters during the drilling process;

[0106] The data relationship analysis module is configured to construct a theoretical relationship between drilling speed and drilling pressure, rotation speed and drill bit size parameters based on the force analysis of the drill bit and the rock during the drilling process and the rock cutting energy theory;

[0107] The evaluation index determination module is configured to construct a normalized expression parameter of drilling speed that removes the influence of drilling pressure and rotation speed, namely, the rock mass integrity index, based on the theoretical relationship between drilling pressure, rotation speed and drill bit size parameters;

[0108] A test comparison module is configured to conduct drilling tests on rock masses with different integrity using a drill bit, and to build a database for comparing rock mass integrity index values ​​with actual rock mass integrity;

[0109] The analysis and evaluation module is configured to determine the classification correspondence between the rock mass integrity index and the rock mass integrity according to the compared database, so as to realize the quantitative evaluation of the rock mass integrity.

[0110] The examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment 1. It should be noted that the above modules as part of the system can be executed in a computer system such as a set of computer executable instructions.

[0111] The description of each embodiment in the above embodiments has different emphases. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0112] The proposed system can be implemented in other ways. For example, the system embodiment described above is only illustrative, and the division of the modules is only a logical function division. In actual implementation, there may be other division methods, such as multiple modules can be combined or integrated into another system, or some features can be ignored or not executed.

[0113] Embodiment 3

[0114] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps in the rock integrity evaluation method based on digital drilling testing technology as described in the first embodiment above are implemented.

[0115] Embodiment 4

[0116] This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps in the rock integrity evaluation method based on digital drilling testing technology as described in the first embodiment are implemented.

[0117] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0118] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0121] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0122] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A rock mass integrity evaluation method based on digital drilling testing technology, characterized in that: include: Obtain drilling parameters and drill bit size parameters during drilling; Based on the force analysis of the drill bit and the rock during drilling and the rock cutting energy theory, the theoretical relationship between drilling speed and drilling pressure, rotation speed and drill bit size parameters is constructed, specifically: The force analysis of the single tooth of the drill bit as a rock breaking cutting unit is carried out to determine the force on the cutting tooth during the rock breaking process of the drill bit; According to the limit balance principle, the theoretical relationship between torque, drilling pressure and drill bit size parameters is determined as follows: ； The drill bit radius is R , the inclination angle of the drill bit cutting teeth is θ , the friction angle between rock and drill bit cutting teeth is α , cutting tooth width is L The sliding friction coefficient of rock is μ , torque M , drilling pressure F ; According to the rock-breaking energy theory, it is determined that the energy of the drill bit to break the rock comes from the work done by the drilling pressure and the work done by the cutting force; According to the relationship between drilling pressure, drilling torque, rotation speed and drilling speed and the work done by drilling pressure and cutting force, the theoretical relationship of drilling speed with respect to drilling pressure, rotation speed and drill bit size parameters is determined. The theoretical relationship of drilling speed with respect to drilling pressure, rotation speed and drill bit size parameters is specifically as follows: ； Among them, the energy consumed by the drill bit to break a unit volume of rock is ω b , the inclination angle of the drill bit cutting teeth is θ , drilling speed V、 Drilling pressure F and speed N ,definition ; Based on the theoretical relationship between drilling pressure, rotation speed and drill bit size parameters, a normalized expression parameter of drilling speed that removes the influence of drilling pressure and rotation speed is constructed as the rock mass integrity index; the rock mass integrity index is specifically: ； in, C 1 and C 2 is a constant, which is a parameter related to rock strength; Drilling tests were carried out using drill bits in rock masses with different integrity levels, and a database was constructed to compare the rock mass integrity index values ​​with the actual rock mass integrity; The classification correspondence between the rock mass integrity index and the rock mass integrity is determined based on the compared database to achieve quantitative evaluation of the rock mass integrity.

2. The rock mass integrity evaluation method based on digital drilling test technology according to claim 1, characterized in that: The drilling parameters include drilling pressure, drilling torque, rotation speed and drilling speed; The drill bit size parameters include drill bit radius, drill bit cutting tooth inclination angle and cutting tooth width.

3. The rock mass integrity evaluation method based on digital drilling test technology according to claim 1, characterized in that: The drilling test of rock masses with different integrity is carried out using a drill bit to build a database for comparing the rock mass integrity index value with the actual integrity of the rock mass, specifically: Drilling tests were carried out using P drill bits in rock masses with different integrity; By obtaining the drilling parameters, drill bit parameters and the energy consumed by the drill bit to break a unit volume of rock corresponding to different integrity levels, the corresponding rock integrity index value is finally calculated. Using the above calculation results, a database is constructed to compare different rock mass integrity index values ​​with the actual integrity of the corresponding rock mass.

4. The rock integrity evaluation system based on digital drilling test technology is characterized by: include: A data acquisition module is configured to obtain drilling parameters and drill bit size parameters during the drilling process; The data relationship analysis module is configured to construct a theoretical relationship between drilling speed, drilling pressure, rotation speed and drill bit size parameters based on the force analysis of the drill bit and the rock during drilling and the rock cutting energy theory, specifically: The force analysis of the single tooth of the drill bit as a rock breaking cutting unit is carried out to determine the force on the cutting tooth during the rock breaking process of the drill bit; According to the limit balance principle, the theoretical relationship between torque, drilling pressure and drill bit size parameters is determined as follows: ； The drill bit radius is R , the inclination angle of the drill bit cutting teeth is θ , the friction angle between rock and drill bit cutting teeth is α , cutting tooth width is L The sliding friction coefficient of rock is μ , torque M , drilling pressure F ; According to the rock-breaking energy theory, it is determined that the energy of the drill bit to break the rock comes from the work done by the drilling pressure and the work done by the cutting force; According to the relationship between drilling pressure, drilling torque, rotation speed and drilling speed and the work done by drilling pressure and cutting force, the theoretical relationship of drilling speed with respect to drilling pressure, rotation speed and drill bit size parameters is determined. The theoretical relationship of drilling speed with respect to drilling pressure, rotation speed and drill bit size parameters is specifically as follows: ； Among them, the energy consumed by the drill bit to break a unit volume of rock is ω b , the inclination angle of the drill bit cutting teeth is θ , drilling speed V、 Drilling pressure F and speed N ,definition ; The evaluation index determination module is configured to construct a normalized expression parameter of drilling speed that removes the influence of drilling pressure and rotation speed based on the theoretical relationship between drilling pressure, rotation speed and drill bit size parameters as a rock mass integrity index; the rock mass integrity index is specifically: ； in, C 1 and C 2 is a constant, which is a parameter related to rock strength; A test comparison module is configured to conduct drilling tests on rock masses with different integrity using a drill bit, and to build a database for comparing rock mass integrity index values ​​with actual rock mass integrity; The analysis and evaluation module is configured to determine the classification correspondence between the rock mass integrity index and the rock mass integrity according to the compared database, so as to realize the quantitative evaluation of the rock mass integrity.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps in the rock integrity evaluation method based on digital drilling testing technology as described in any one of claims 1 to 3 are implemented.

6. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps in the rock integrity evaluation method based on digital drilling testing technology as described in any one of claims 1 to 3 are implemented.

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