Method and system for determining drillability grade value of rock mass of down-the-hole drill

Abstract

The invention provides a method and a system for determining a rock drillability grade value of a down-the-hole drill. The system comprises a data acquisition module and an industrial personal computer, the data acquisition module is used for acquiring while-drilling parameters of the down-the-hole drill; the while-drilling parameters comprise drilling axial force, drilling torque, impact force and impact frequency; the industrial personal computer is electrically connected with the data acquisition module and can acquire parameters while drilling; the industrial personal computer can also calculate the drilling specific energy of the down-the-hole drill according to the while-drilling parameters and determine the drillability grade value of the rock mass in real time; according to the scheme provided by the invention, the drilling working parameters and the change of the drilling machine rate can be accurately obtained in real time according to the measurement-while-drilling system, so that the rock drillability grade value and lithology judgment are determined in the field drilling process.

Description

Technical Field

[0001] The invention belongs to the technical field of determining the drillability grade value of a rock mass of a down-the-hole drill, and in particular relates to a method and a system for determining the drillability grade value of a rock mass of a down-the-hole drill. Background Art

[0002] In order to evaluate the difficulty of drilling in open-pit mines, appropriate drilling tools are selected and corresponding drillability evaluation standards and methods are formulated. At present, the evaluation methods of rock drillability are mostly applied to rotary drills, which only calculate the drilling specific energy under the action of axial force and torque, and evaluate the drillability of rock according to the drilling specific energy of the rotary drill during the drilling process. Due to the difference in rock breaking mechanism between rotary drills and down-the-hole drills, down-the-hole drills mainly use the propulsion mechanism to apply a certain axial pressure to the bottom of the hole to ensure that the drill bit is always in contact with the rock at the bottom of the hole. The rotary mechanism makes the drill tool rotate continuously. At the same time, the impactor installed at the front end of the drill rod continuously impacts the rock under the action of wind pressure to break the rock. However, the drilling specific energy calculation method of the rotary drill fails to consider the effect of impact rock breaking due to the different working principles. However, the rock breaking of the down-the-hole drill mainly relies on the impact effect, and the crushing effect of the impact on the rock needs to be considered.

[0003] At present, the method for measuring the drillability of rock by impact drilling mainly relies on measuring the drilling speed by simulating drilling with a micro-drill in the laboratory, and then inferring the drillability level of the rock based on the drilling speed equation. Although the indoor micro-drilling test can precisely control the drilling parameters and accurately record the state of the rock sample during the drilling process, it is difficult to determine the proportional coefficient between the micro-drilling parameters and the field drilling parameters, and the performance in field applications is also poor.

[0004] Based on the technical problems existing in the above-mentioned open-pit mine rock drilling analysis process, there is no relevant solution yet; therefore, there is an urgent need to find effective solutions to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies and to propose a method and system for determining the drillability grade of a rock mass by a down-the-hole drill, so as to solve the problems of rock mass drilling analysis and determination in existing open-pit mines.

[0006] The present invention provides a method for determining the drillability grade value of a rock mass of a down-the-hole drill, and the determination method comprises:

[0007] S1: Obtaining the down-the-hole drilling rig's drilling parameters; the drilling parameters include drilling axial force, drilling torque, impact force, and impact frequency;

[0008] S2: Analyze the drilling energy of three parts: drilling axial force, drilling torque and impact force;

[0009] S3: Calculate the drilling specific energy of the down-the-hole drill;

[0010] S4: Finally, the real-time determination of the drillability grade of the rock mass is carried out.

[0011] Furthermore, step S2 includes: calculating the energy increments of the thrust force (F), torque (T) and impact of the down-the-hole drill according to the following formulas:

[0012] ΔE Impact =P·Δt (1);

[0013] ΔE Torque =T·Δθ (2);

[0014] ΔE Thrust =F·Δx (3);

[0015] Where: P is the impact power of the down-the-hole drill; T is the drilling torque, N·m; F is the propulsion force, N; ΔE Impact It indicates the energy part of the impactor that provides rock breaking within a certain period of time Δt; ΔE Torque It indicates the rock-breaking energy provided by the torque when the drill bit rotates at a certain angle Δθ; ΔE Thrust It indicates the rock-breaking energy portion provided by the propulsion force under a certain drilling displacement Δx.

[0016] Furthermore, step S2 also includes: introducing the drill bit penetration rate (ROP) and angular velocity Thus the drilling specific energy of down-the-hole drilling rig is calculated;

[0017]

[0018]

[0019] The drilling specific energy is expressed as:

[0020]

[0021] Where: SE represents drilling specific energy; A is the drilling area, unit is m 2 ;

[0022] Substituting equations (4) and (5) into (6), we obtain:

[0023]

[0024] Furthermore, the rock mass drillability level is determined in real time by the following formula:

[0025] Where: K d Indicates the drillability level of the rock mass.

[0026] Accordingly, the present invention also provides a system for determining the drillability grade value of a rock mass of a down-the-hole drill, the determination system comprising:

[0027] A data acquisition module is used to obtain the down-the-hole drilling rig's drilling parameters; the drilling parameters include drilling shaft force, drilling torque, impact force and impact frequency;

[0028] An industrial computer, electrically connected to the data acquisition module, and capable of acquiring drilling parameters;

[0029] The industrial computer can also calculate the drilling specific energy of the down-the-hole drill based on the drilling parameters and determine the rock drillability grade in real time.

[0030] Furthermore, the industrial computer calculates the energy increments of the thrust force (F), torque (T) and impact of the down-the-hole drill according to the following formulas:

[0031] ΔE Impact =P·Δt (1);

[0032] ΔE Torque =T·Δθ (2);

[0033] ΔE Thrust =F·Δx (3);

[0034] Where: P is the impact power of the down-the-hole drill; T is the drilling torque, N·m; F is the propulsion force, N; ΔE Impact It indicates the energy part of the impactor that provides rock breaking within a certain period of time Δt; ΔE Torque It indicates the rock-breaking energy provided by the torque when the drill bit rotates at a certain angle Δθ; ΔE Thrust It indicates the rock-breaking energy portion provided by the propulsion force under a certain drilling displacement Δx.

[0035] Furthermore, the industrial computer also calculates the drilling speed (ROP) and angular velocity of the drill bit. Thus, the drilling specific energy of the down-the-hole drill is calculated; where:

[0036]

[0037]

[0038] The drilling specific energy is expressed as:

[0039]

[0040] Where: SE represents drilling specific energy; A is the drilling area, unit is m 2 ;

[0041] Substituting equations (4) and (5) into (6), we obtain:

[0042]

[0043] Furthermore, the industrial computer determines the rock mass drillability level in real time through the following formula:

[0044] Where: K d Indicates the drillability level of the rock mass.

[0045] The method and system for determining the drillability grade of a rock mass of a down-the-hole drill provided by the present invention have the following technical effects:

[0046] First, the solution provided by the present invention has a high degree of real-time performance. Compared with the method of drilling cores on site and using a micro drill bit to simulate drilling in the laboratory to infer the drillability level of the rock, the solution can be better carried out simultaneously with the on-site drilling operation, ensuring the real-time performance of obtaining the drillability level of the rock mass during the drilling process.

[0047] Second, the scheme provided by the present invention has a high degree of accuracy. The conditions of laboratory cores and on-site rock masses are quite different, making it difficult to characterize the weak structural surfaces such as a large number of cracks existing in the on-site rock mass, and it is difficult to determine which mechanical parameters to use to evaluate drillability. The drilling parameters obtained by the scheme of the present application are highly accurate, and the characterization of the drillability of the on-site rock mass is more in line with the actual lithology.

[0048] Third, the solution provided by the present invention has significant economic benefits; the solution saves the time-consuming and laborious process of drilling cores on site and transporting them to the laboratory for measurement, and obtains the drillability grade of the rock mass at the same time as the drilling operation without requiring additional costs;

[0049] Fourthly, the solution provided by the present invention is based on high-precision rock drillability grade values, which facilitates the subsequent refined extraction of lithology and stratigraphic information of the entire blasting area. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] The present invention will be further described below in conjunction with the accompanying drawings:

[0052] Figure 1 A flow chart of a method for determining a rock mass drillability grade value of a down-the-hole drill provided by an embodiment of the present invention;

[0053] Figure 2 A schematic diagram of a system for determining the drillability grade of a rock mass of a down-the-hole drill provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0055] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] like Figure 1 As shown, the embodiment of the present invention provides a method for determining the drillability grade of a rock mass of a down-the-hole drill, which aims to determine the drillability of the rock according to the actual in-situ drilling effect on site. With the help of the developed drilling system, the drilling parameters in the drilling process can be obtained in real time and accurately, and the drilling specific energy of the down-the-hole drill can be analyzed to determine the drillability grade of the rock mass; wherein,

[0060] The determination method comprises the following steps:

[0061] S1: Obtaining drilling parameters of a down-the-hole drill; wherein the drilling parameters include drilling axial force, drilling torque, impact force and impact frequency;

[0062] S2: Analyze the drilling energy of three parts: drilling axial force, drilling torque and impact force;

[0063] S3: Calculate the drilling specific energy of the down-the-hole drill;

[0064] S4: Finally, the rock mass drillability level is determined in real time to obtain rock mass drilling judgment.

[0065] Preferably, in combination with the above solution, step S2 specifically includes: calculating the energy increments of the thrust force (F), torque (T) and impact of the down-the-hole drill respectively according to the following formulas:

[0066] ΔE Impact =P·Δt (1);

[0067] ΔE Torque =T·Δθ (2);

[0068] ΔE Thrust =F·Δx (3);

[0069] Where: P is the impact power of the down-the-hole drill; T is the drilling torque, N·m; F is the propulsion force, N; ΔE Impact It indicates the energy part of the impactor that provides rock breaking within a certain period of time Δt; ΔE Torque It indicates the rock-breaking energy provided by the torque when the drill bit rotates at a certain angle Δθ; ΔE Thrust It indicates the rock-breaking energy portion provided by the propulsion force under a certain drilling displacement Δx.

[0070] Preferably, in combination with the above solution, step S2 further includes: introducing the drill bit penetration rate (ROP) and angular velocity The drilling specific energy of the down-the-hole drill is thus calculated; specifically, the drill bit penetration rate (ROP) and angular velocity It is expressed by the following formula:

[0071]

[0072]

[0073] Furthermore, the drilling specific energy is expressed as:

[0074]

[0075] Where: SE represents drilling specific energy; A is the drilling area, unit is m 2 ;

[0076] Furthermore, substituting equations (4) and (5) into (6) yields:

[0077]

[0078] Preferably, in combination with the above scheme, the present application scheme specifically determines the rock mass drillability level value in real time through the following formula:

[0079] Where: K d Indicates the drillability level of the rock mass; please refer to the following implementation data for details:

[0080] Table 1 Measurement while drilling data and calculation of drillability grade

[0081]

[0082]

[0083] Through the above method, the changes in drilling working parameters and drilling rig rate can be obtained in real time and accurately according to the measurement while drilling system, so as to determine the rock drillability grade and lithology during the on-site drilling process; the method for determining the drillability grade of the rock mass of the down-the-hole drilling rig provided by the present invention can be used for drill bit selection, formulation of production quotas and formation lithology judgment.

[0084] The present invention provides a method for determining the drillability grade of a rock mass of a down-the-hole drill, which has the following technical effects:

[0085] First, the method for determining the drillability grade of a rock mass of a down-the-hole drill provided by the present invention can solve the problem that the accuracy of the rock drillability grade determined by on-site coring and laboratory is low, and it is difficult to characterize the rock drillability grade of a large-scale blasting area;

[0086] Second, the method for determining the drillability grade of a rock mass provided by the present invention can solve the problem that the rock drillability grade results measured in the laboratory are greatly different from the actual rock mass lithology on site due to the high degree of weathering, strong crack development and complex lithology of the rock mass on site;

[0087] Third, the method for determining the drillability grade of a rock mass by a down-the-hole drill provided by the present invention can reduce the cost of on-site coring and laboratory determination of the drillability grade of the rock.

[0088] Accordingly, combined with the above scheme, Figure 2 As shown, the present invention also provides a system for determining the drillability grade of a rock mass of a down-the-hole drill, which is intended to determine the drillability of the rock according to the actual in-situ drilling effect on site. With the help of the developed drilling system, the drilling parameters in the drilling process can be obtained in real time and accurately, and the drilling specific energy of the down-the-hole drill can be analyzed to determine the drillability grade of the rock mass; wherein,

[0089] The determination system comprises:

[0090] A data acquisition module is used to obtain the down-the-hole drilling rig's drilling parameters; the drilling parameters include drilling shaft force, drilling torque, impact force and impact frequency;

[0091] An industrial computer, electrically connected to the data acquisition module, and capable of acquiring drilling parameters;

[0092] Specifically, the industrial computer can also calculate the drilling specific energy of the down-the-hole drill according to the drilling parameters, and determine the drillability grade of the rock mass in real time.

[0093] Preferably, in combination with the above solution, the industrial computer of the present application solution calculates the energy increments of the propulsion force (F), torque (T) and impact of the down-the-hole drill according to the following formulas:

[0094] ΔE Impact =P·Δt (1);

[0095] ΔE Torque =T·Δθ (2);

[0096] ΔE Thrust =F·Δx (3);

[0097] Where: P is the impact power of the down-the-hole drill; T is the drilling torque, N·m; F is the propulsion force, N; ΔE Impact It indicates the energy part of the impactor that provides rock breaking within a certain period of time Δt; ΔE Torque It indicates the rock-breaking energy provided by the torque when the drill bit rotates at a certain angle Δθ; ΔE Thrust It indicates the rock-breaking energy portion provided by the propulsion force under a certain drilling displacement Δx.

[0098] Preferably, in combination with the above solution, the industrial computer of the present application solution also adjusts the drilling speed (ROP) and angular velocity of the drill bit according to the drilling speed (ROP) and angular velocity. Thus, the drilling specific energy of the down-the-hole drill is calculated; where:

[0099]

[0100]

[0101] The drilling specific energy is expressed as:

[0102]

[0103] Where: SE represents drilling specific energy; A is the drilling area, unit is m 2 ;

[0104] Substituting equations (4) and (5) into (6), we obtain:

[0105]

[0106] Preferably, in combination with the above solution, the industrial computer of the present application solution determines the rock mass drillability level in real time through the following formula:

[0107] Where: K d Indicates the drillability level of the rock mass.

[0108] The above determination system can obtain the changes in drilling working parameters and drilling rig rate in real time and accurately according to the measurement while drilling system, so as to determine the rock drillability grade and lithology during the on-site drilling process, which can be used for drill bit selection, production quota formulation and formation lithology judgment.

[0109] The method and system for determining the drillability grade of a rock mass of a down-the-hole drill provided by the present invention have the following technical effects:

[0110] First, the solution provided by the present invention has a high degree of real-time performance. Compared with the method of drilling cores on site and using a micro drill bit to simulate drilling in the laboratory to infer the drillability level of the rock, the solution can be better carried out simultaneously with the on-site drilling operation, ensuring the real-time performance of obtaining the drillability level of the rock mass during the drilling process.

[0111] Second, the scheme provided by the present invention has a high degree of accuracy. The conditions of laboratory cores and on-site rock masses are quite different, making it difficult to characterize the weak structural surfaces such as a large number of cracks existing in the on-site rock mass, and it is difficult to determine which mechanical parameters to use to evaluate drillability. The drilling parameters obtained by the scheme of the present application are highly accurate, and the characterization of the drillability of the on-site rock mass is more in line with the actual lithology.

[0112] Third, the solution provided by the present invention has significant economic benefits; the solution saves the time-consuming and laborious process of drilling cores on site and transporting them to the laboratory for measurement, and obtains the drillability grade of the rock mass at the same time as the drilling operation without requiring additional costs;

[0113] Fourthly, the solution provided by the present invention is based on high-precision rock drillability grade values, which facilitates the subsequent refined extraction of lithology and stratigraphic information of the entire blasting area.

[0114] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above-mentioned technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention belong to the protection scope of the present technical solution.

Claims

1. A method for determining the drillability grade of rock mass for down-the-hole drilling rigs, It is characterized in that The determination method comprises: S1: Obtaining drilling parameters of a down-the-hole drill; the drilling parameters include drilling axial force, drilling torque, impact force and impact frequency; S2: analyzing the drilling energy of the drilling axial force, the drilling torque and the impact force; S3: Calculate the drilling specific energy of the down-the-hole drill; S4: Finally, the real-time determination of the drillability grade of the rock mass is carried out.

2. The method for determining the drillability grade of a down-the-hole drill according to claim 1, It is characterized in that The step S2 comprises: calculating the energy increments of the propulsion force (F), torque (T) and impact of the down-the-hole drill according to the following formulas: DE Impact =P·Δt (1); DE Torque =T·Δθ (2); ΔE Thrust =F·Δx (3); Where: P is the impact power of the down-the-hole drill; T is the drilling torque, N·m; F is the propulsion force, N; ΔE Impact It indicates the energy part of the impactor that provides rock breaking within a certain period of time Δt; ΔE Torque It indicates the rock-breaking energy provided by the torque when the drill bit rotates at a certain angle Δθ; ΔE Thrust It indicates the rock-breaking energy portion provided by the propulsion force under a certain drilling displacement Δx.

3. The method for determining the drillability grade of a down-the-hole drill according to claim 2, It is characterized in that The step S2 also includes: introducing the drill bit penetration rate (ROP) and angular velocity Thus the drilling specific energy of down-the-hole drilling rig is calculated; The drilling specific energy is expressed as: Where: SE represents drilling specific energy; A is the drilling area, unit is m 2 ; Substituting equations (4) and (5) into (6), we obtain:

4. The method for determining the drillability grade of a down-the-hole drill according to claim 3, It is characterized in that The rock mass drillability level is determined in real time using the following formula: Where: K d Indicates the drillability level of the rock mass.

5. A system for determining the drillability grade of rock mass for down-the-hole drilling rigs, It is characterized in that The determination system comprises: A data acquisition module is used to obtain the drilling parameters of the down-the-hole drill; the drilling parameters include drilling axial force, drilling torque, impact force and impact frequency; An industrial computer, electrically connected to the data acquisition module and capable of acquiring the drilling parameters; The industrial computer can also calculate the drilling specific energy of the down-the-hole drill according to the drilling parameters, and determine the drillability level of the rock mass in real time.

6. The system for determining the drillability grade of a down-the-hole drill according to claim 5, It is characterized in that The industrial computer calculates the energy increments of the thrust force (F), torque (T) and impact of the down-the-hole drill according to the following formulas: DE Impact =P·Δt (1); DE Torque =T·Δθ (2); ΔE Thrust =F·Δx (3); Where: P is the impact power of the down-the-hole drill; T is the drilling torque, N·m; F is the propulsion force, N; ΔE Impact It indicates the energy part of the impactor that provides rock breaking within a certain period of time Δt; ΔE Torque It indicates the rock-breaking energy provided by the torque when the drill bit rotates at a certain angle Δθ; ΔE Thrust It indicates the rock-breaking energy portion provided by the propulsion force under a certain drilling displacement Δx.

7. The system for determining the drillability grade of a down-the-hole drill according to claim 6, It is characterized in that The industrial computer also calculates the drilling speed (ROP) and angular velocity of the drill bit. Thus the drilling specific energy of down-the-hole drilling rig is calculated; in: The drilling specific energy is expressed as: Where: SE represents drilling specific energy; A is the drilling area, unit is m 2 ; Substituting equations (4) and (5) into (6), we obtain:

8. The system for determining the drillability grade of a down-the-hole drill according to claim 7, It is characterized in that The industrial computer determines the rock mass drillability level in real time through the following formula: Where: K d Indicates the drillability level of the rock mass.

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