Drilling torque and thrust prediction method based on drilling rig hydraulics, drilling rig test system

Abstract

The present invention relates to a method for predicting drilling torque and thrust based on drilling rig hydraulics. This method requires only pre-project test data collection using a drilling rig test system. A conversion formula is then derived through fitting. This derived conversion formula can then be used to derive true torque and thrust from hydraulic pressure monitoring during actual drilling, enabling the accurate collection of mechanical data for while-drilling monitoring. The test system includes a hydraulic sensor, a pressure sensor, a magnetic powder brake, and a dynamic torque and speed sensor. Furthermore, the test method only needs to be performed once for each drilling rig model, and the resulting conversion formula can be permanently applied to that rig, unaffected by drill bit wear or replacement of parts such as drill rods.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a drilling torque and thrust prediction method based on drilling rig hydraulic pressure and a drilling rig test system. Background Art

[0002] As early as the 1930s, the technology of using instruments to record drilling parameters while drilling was used to measure the physical and chemical composition of drilling fluids in oil and gas well exploration and development. Today, logging while drilling (LWD), or monitoring while drilling (MWD), is widely used in the oil and gas field and mineral mining industries. The primary purpose of these MWD instruments is to measure the chemical composition and physical properties of drilling fluids, monitor the proper functioning of drill tools, provide geological guidance during drilling, and optimize the drilling process. Their most significant characteristic is that data is collected based on drilling depth, with the data being presented as a depth sequence arranged at intervals of drilling depth. After the 1970s, rock engineering researchers in countries such as France, Canada, Italy, the United States, and Japan became aware of these LWD instruments and hoped to solve some of the difficulties in stratigraphic delineation during geotechnical drilling. They began using these instruments to monitor parameters while drilling and delineate stratigraphic quality during geotechnical site surveys. These drilling parameters can provide important support for projects such as soil-rock interface identification at dredging sites, site foundation reinforcement, engineering site surveys, weak coal seams in hard rocks, soil grouting reinforcement inspections, rock mass engineering ratings, and cave exploration in power plants.

[0003] Although some international researchers have devoted significant research and work to evaluating the quality of geotechnical and rock mass using MWD, MWD has remained largely undeveloped in geotechnical and rock engineering, and is currently not a standard or standard method for geotechnical construction or exploration. A major challenge is that drilling involves the direct physical destruction of the rock mass by the drill bit. Therefore, direct mechanical parameters, such as torque and thrust during drilling, must be collected to analyze the lithology and interfaces of the subsurface rock mass. However, these MWD mechanical parameters are difficult to measure directly. This requires installing a series of sensors in the drill bit and drill pipe, which inevitably affects the drilling efficiency of the drill rig. Consequently, for many years, the research development and market penetration of MWD have been significantly limited. Although many universities have developed specialized drilling rigs capable of measuring these drilling mechanical parameters, these specialized rigs or equipment are expensive, and their portability and accessibility still require further improvement. This difficulty has led many international geotechnical researchers to lose interest in in-depth MWD research, resulting in very few relevant research papers.

[0004] Therefore, how to non-destructively and conveniently monitor the actual torque and thrust of the drill during the drilling process in the rock and soil to meet the requirements of the later analysis of the drilling monitoring data has become a technical problem that needs to be solved. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a drilling torque and thrust prediction method based on drilling rig hydraulics and a drilling rig test system to solve or partially solve the current problem of lack of a method for conveniently obtaining the torque and thrust of the drilling rig during drilling in rock and soil.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] One aspect of the present invention provides a drilling torque and thrust prediction method based on drilling rig hydraulics. By collecting the drilling rig's rotation hydraulics, propulsion hydraulics, and drill pipe drilling speed data, and using the fitted drilling torque prediction formula and thrust prediction formula, the predicted torque and thrust are obtained, thereby achieving online prediction.

[0008] The process of constructing the drilling torque prediction formula includes the following steps:

[0009] Through the test, the target drilling rig obtains the actual measured rotary hydraulic pressure, drilling speed and torque data over a period of time under various rotary hydraulic gear positions and rotary resistance combinations;

[0010] The rotational hydraulic pressure, drilling speed and torque data are averaged in the time dimension and fitted in the combined dimension to obtain a drilling torque prediction formula based on hydraulic pressure and drilling speed;

[0011] The process of constructing the thrust prediction formula includes the following steps:

[0012] Through the test, the propulsion hydraulic pressure and drill bit pressure data of the target drilling rig were measured over a period of time under various combinations of rotary hydraulic gears and rotary resistance.

[0013] The propulsion hydraulic pressure and drill bit pressure data are averaged in the time dimension and fitted in the combination dimension to obtain a thrust prediction formula based on the propulsion hydraulic pressure.

[0014] As a preferred technical solution, in the process of fitting the drilling torque prediction formula, the fitting process in the combined dimension includes the following steps:

[0015] In the combination dimension, for each combination of rotary hydraulic gear and rotary resistance, based on the rotary hydraulic pressure, drilling speed and torque data averaged over time, a linear fitting formula is obtained for the average torque-average rotary hydraulic pressure at the same drilling speed.

[0016] Based on the linear intercept of the average torque-average rotational hydraulic pressure fitting formula, a linear intercept-average drilling speed fitting formula is obtained by linear fitting;

[0017] Based on the average torque-average rotational hydraulic pressure fitting formula and the linear intercept-average drilling speed fitting formula, a thrust prediction formula based on propulsion hydraulic pressure is obtained.

[0018] As a preferred technical solution, the average torque-average rotation hydraulic fitting formula is:

[0019] T=r1P r +y

[0020] Among them, T, P r are the average torque and average rotary hydraulic pressure, r1 and y are the linear slope and linear intercept, respectively.

[0021] As a preferred technical solution, the linear intercept-average drilling speed fitting formula is:

[0022] y=r2RPM

[0023] Where r2 and y are the linear slope and linear intercept, respectively, and RPM is the average drilling speed.

[0024] As a preferred technical solution, the thrust prediction formula is:

[0025] T=r1P r +r2RPM

[0026] Among them, T, P r , RPM are the average torque, average rotary hydraulic pressure, and average drilling speed, respectively; r1 and r2 are the linear slopes.

[0027] As a preferred technical solution, the thrust prediction formula is:

[0028] F t =sP t

[0029] Among them, P t 、F t are propulsion hydraulic pressure and thrust respectively, and s is the linear slope.

[0030] As a preferred technical solution, in the drilling torque prediction formula, the rotational hydraulic pressure is positively correlated with the torque, and the linear intercept is negatively correlated with the drilling speed; in the thrust prediction formula, the propulsion hydraulic pressure is positively correlated with the thrust.

[0031] As a preferred technical solution, it also includes:

[0032] The performance of the drilling rig is evaluated based on the linear slope obtained from the fitting formula.

[0033] As a preferred technical solution, when measuring the rotational hydraulic pressure, drilling speed and torque data, measurement starts from the combination corresponding to the minimum rotational hydraulic pressure gear and the minimum rotational resistance; when measuring the propulsion hydraulic pressure and drill bit pressure data, measurement starts from the combination corresponding to the minimum propulsion hydraulic pressure.

[0034] Another aspect of the present invention provides a drilling rig test system for acquiring test data in the aforementioned drilling rig hydraulics-based drilling torque and thrust prediction method.

[0035] The drilling rig test system, in a first state, comprises:

[0036] magnetic powder brakes, used to provide rotational resistance to the drill;

[0037] A dynamic torque drilling speed sensor is connected to the magnetic powder brake and one end of the drill pipe of the drilling rig, respectively, for measuring real-time torque and drilling speed;

[0038] A rotary hydraulic pressure sensor is connected to the hydraulic assembly of the drill pipe of the drilling rig to measure the real-time rotary hydraulic pressure;

[0039] The drilling rig test system, in the second state, comprises:

[0040] Pressure sensor, used to measure the real-time pressure of the drill pipe;

[0041] The propulsion hydraulic pressure sensor is connected to the hydraulic assembly of the drill pipe of the drilling rig to measure the real-time propulsion hydraulic pressure.

[0042] As a preferred technical solution, in the first state, it also includes:

[0043] a first coupling connected to the magnetic powder brake and the dynamic torque drilling speed sensor respectively;

[0044] The second coupling is connected to the dynamic torque drilling speed sensor and the drill rod of the drilling rig respectively.

[0045] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0046] (1) Realize online prediction of torque and thrust during drilling: In order to solve the problem that torque and thrust cannot be conveniently measured during drilling without modifying the drilling rig, the present invention obtains multiple combinations of test data measured over a period of time, and respectively fits the functional relationship between the rotary hydraulic pressure, drilling speed, torque, propulsion hydraulic pressure, and drill bit pressure to obtain a fitting formula, thereby realizing online non-destructive and accurate prediction of torque and thrust during drilling, allowing operators to monitor on-site drilling torque and axial force, thus overcoming this limitation of drilling monitoring.

[0047] (2) Wide scope of application: The present invention does not require major modifications to the drilling rig itself and is applicable to many types of hydraulic drilling rigs. It greatly reduces the equipment cost of while-drilling monitoring and the difficulty of data collection, helping to promote the scientific research development and application of while-drilling monitoring.

[0048] (3) Evaluation of drilling rig performance: The present invention evaluates the drilling rig performance based on the linear slope obtained in the fitting formula process, and the operator can select a suitable drilling rig for operation based on the evaluation result. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of a drilling torque and thrust prediction method based on drilling rig hydraulics in an embodiment;

[0050] Figure 2 is a schematic diagram of the drilling rig test system in the first state according to an embodiment;

[0051] Figure 3 is a schematic diagram of the drilling rig test system in the second state in the embodiment;

[0052] Figure 4 Schematic diagram of calculating the average values ​​of the time series rotation hydraulic pressure, rotation speed and torque in the embodiment;

[0053] Figure 5 is a graph showing the relationship between the average rotational hydraulic pressure and the average torque in the embodiment;

[0054] Figure 6 Schematic diagram of the relationship between intercept and average drilling speed in the embodiment;

[0055] Figure 7 A schematic diagram showing the acquisition of the average propulsion hydraulic pressure and average thrust of the time series in the embodiment;

[0056] Figure 8 This is a schematic diagram of the conversion formula for thrust and propulsion hydraulic pressure in the embodiment.

[0057] Among them, 1. Magnetic powder brake, 2. Dynamic torque drilling speed sensor, 3. Rotational hydraulic sensor, 4. Pressure sensor, 5. Propulsion hydraulic sensor, 6. Drilling rig drill pipe. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0059] Example 1

[0060] To address the aforementioned issues with the existing technology, this embodiment provides a method for predicting drilling torque and thrust based on drill rig hydraulics. This method requires only a set of pre-drilling tests for each drill rig to obtain a conversion formula specific to that rig. This conversion formula can then be used during actual geotechnical drilling using the drill rig, providing accurate torque and thrust calculations simply by monitoring the drill rig's hydraulics and drilling speed. This method effectively addresses the limitations of while-drilling parameter acquisition, thereby reducing the cost and manufacturing time of while-drilling monitoring equipment.

[0061] See also Figure 1 The method includes three stages: constructing a drilling torque prediction formula (corresponding to steps S1 and S2), constructing a thrust prediction formula (corresponding to steps S3 and S4), and online prediction. The two formula construction stages can be performed simultaneously or in a different order. Specifically, the method includes the following steps:

[0062] The process of constructing the drilling torque prediction formula includes the following steps:

[0063] Step S1 : obtaining, through experiments, the measured rotary hydraulic pressure, drilling speed, and torque data of a target drilling rig under various rotary hydraulic gear positions and rotary resistance combinations over a period of time.

[0064] The magnetic powder brake, which provides rotational resistance to the drill, was set to five different settings, from low to high. Furthermore, the drill's rotational hydraulic pressure was also set to five different settings. At the start of the test, the magnetic powder brake was adjusted to the lowest setting, followed by the drill's rotational hydraulic pressure, which was maintained for at least ten seconds. The sensors recorded the hydraulic pressure, drilling speed, and torque.

[0065] Then increase the drilling rig's rotation hydraulic gear in sequence, maintaining a data collection time of ten seconds at each gear.

[0066] After all five gears of the drilling rig's rotary hydraulics have been collected, the magnetic powder brake is adjusted to the next gear and the above process is repeated until all five gears of the magnetic powder brake have collected data. The test is completed and time series data of rotary hydraulics, drilling speed, and torque under multiple combinations are obtained.

[0067] Step S2: averaging the rotational hydraulic pressure, drilling speed and torque data in the time dimension, and fitting the data in the combined dimension to obtain a drilling torque prediction formula based on the hydraulic pressure and drilling speed.

[0068] Under each gear condition, the ten-second rotation hydraulic pressure, speed and torque collected can be used to obtain the corresponding average rotation hydraulic pressure P by the average method. r , average speed RPM and average torque T, such as Figure 4 As stated.

[0069] Using the average rotary hydraulic pressure P r And the average torque T, establish a line graph with the horizontal axis as the rotary hydraulic pressure and the vertical axis as the torque, as shown in Figure 5 As stated.

[0070] In the broken line chart, the data with the same rotation speed are grouped together, and the average rotary hydraulic pressure P under the same drilling speed conditions is obtained through linear fitting. r The linear equation for the average torque T. If the experiment uses five rotary hydraulic settings, there will be five corresponding rotational speeds, so five straight lines need to be fitted, resulting in five fitting equations. The number of rotary hydraulic settings is equal to the number of linear fitting equations. The fitting equation must be consistent with the following formula. Here, r1 is the linear slope, also known as the rotary hydraulic and torque coefficient, and y is the linear intercept.

[0071] T=r1P r +y

[0072] The intercept y in all linear fitting formulas needs to be recorded and a line graph with the corresponding rotation speed is established with the horizontal axis as the drilling speed and the vertical axis as the intercept, such as Figure 6 Then, a linear fit is used to obtain the fitting formula for the intercept y and the RPM. The fitting formula must be consistent with the following formula. Where r2 is the linear slope, also known as the speed and rotary hydraulic coefficient. Note that this linear relationship has no intercept. When y = 0, RPM = 0.

[0073] y=r2RPM

[0074] According to the linear formula, the following final conversion formula of rotary hydraulic pressure and drilling speed to torque is obtained. This formula is specific to the drilling rig used in the test, and the torque can be inversely calculated by monitoring the rotary hydraulic pressure and drilling speed.

[0075] T=r1P r +r2RPM

[0076] In the formula, at the same speed, the rotary hydraulic pressure P r It is positively correlated with torque T, and the intercept y is negatively correlated with the RPM. The r1 and r2 values ​​obtained by the method can serve as reference values ​​for measuring the performance of the drilling rig: r1 reveals the relationship between the rotary hydraulic pressure and torque of the drilling rig in the test. The larger the r1 value, the greater the torque the drilling rig can provide under the condition of smaller rotary hydraulic pressure, indicating that the rotary performance of the drilling rig is better; r2 reveals the increment of rotary hydraulic pressure required to increase the drilling speed of the drilling rig in the test. The smaller the r2 value, the smaller the increment of rotary hydraulic pressure required to increase the drilling speed of the drilling rig, indicating that the performance of the drilling rig is better.

[0077] Step S3, obtaining, through experiments, propulsion hydraulic pressure and drill bit pressure data measured over a period of time for the target drilling rig under various combinations of rotary hydraulic gears and rotary resistances.

[0078] First, select the drilling rig's propulsion hydraulic pressure from the smallest to the largest setting through ten levels. Then, set the drilling rig's propulsion hydraulic pressure to the lowest setting and allow the drill bit to press against the pressure sensor at that setting. Simultaneously, the propulsion hydraulic pressure sensor measures the propulsion hydraulic pressure, while the pressure sensor measures the pressure. During this process, the drill bit must maintain contact for ten seconds.

[0079] Control the drilling rig propulsion hydraulic pressure and adjust it to different propulsion hydraulic pressure levels from small to large. Repeat the above process until the relative data of all ten levels are collected to obtain the time series data of the propulsion hydraulic pressure and drill bit pressure measured over a period of time.

[0080] Step S4: averaging the propulsion hydraulic pressure and drill bit pressure data in the time dimension and fitting the data in the combination dimension to obtain a thrust prediction formula based on the propulsion hydraulic pressure.

[0081] The propulsion hydraulic pressure and pressure of the collected time series are averaged to obtain the relative average propulsion hydraulic pressure P t and the corresponding average thrust F t ,like Figure 7 As stated.

[0082] The average propulsion hydraulic pressure P obtained by the method t and the corresponding average thrust F t , establish a horizontal axis for the propulsion hydraulic pressure P t , the vertical coordinate is the thrust F t Line chart.

[0083] Average propulsion hydraulic pressure P t and the corresponding average thrust F t A linear relationship is observed. Through linear fitting, the following consistent final fitting formula is obtained, where s is the linear slope, representing the relationship between propulsion hydraulic pressure and thrust. Note that this linear fitting formula has no intercept. The following formula can be used to derive relative drill bit thrust from real-time monitoring of propulsion hydraulic pressure during actual drilling.

[0084] F t =sP t

[0085] In the above formula, the propulsion hydraulic pressure P t With thrust F t The obtained s value can be used as a reference for measuring the efficiency of the drilling rig: s reveals the relationship between the propulsion hydraulic pressure and thrust of the drilling rig during the test. The larger the s value, the greater the thrust the drilling rig can provide under the condition of smaller propulsion hydraulic pressure, indicating that the drilling rig has better thrust efficiency.

[0086] Step S5, by collecting the rotary hydraulic pressure, propulsion hydraulic pressure and drilling speed data of the drill rig, using the fitted drilling torque prediction formula and thrust prediction formula, the predicted torque and thrust are obtained to achieve online prediction.

[0087] By installing the rotation hydraulic pressure sensor and the propulsion hydraulic pressure sensor, the rotation hydraulic pressure and the propulsion hydraulic pressure during the actual drilling process on site are collected.

[0088] By installing the photoelectric drilling speed sensor, the drilling speed of the drill rod during the actual on-site drilling process is collected.

[0089] Finally, the torque and thrust during the actual drilling process are obtained by using the conversion formulas for rotating hydraulic pressure and speed to torque, and for propulsion hydraulic pressure to thrust, obtained in the previous step. This provides accurate while-drilling parameters for subsequent mechanical analysis of while-drilling parameters.

[0090] This method has the following beneficial effects:

[0091] (1) Two new test procedures were adopted. Through these two tests, the conversion formulas of the rotary hydraulic pressure and the corresponding torque of the drilling rig, and the corresponding thrust of the propulsion hydraulic pressure can be obtained;

[0092] (2) The method of this embodiment is applicable to any type of hydraulic drilling rig;

[0093] (3) This method allows operators to measure the actual on-site drilling torque and axial force, overcoming this limitation of drilling monitoring;

[0094] (4) The conversion formula coefficients r1, r2 and s proposed in this method can be used as a new method to evaluate the quality of drilling rigs;

[0095] (5) This method greatly reduces the equipment cost of MWD and the difficulty of data collection, helping to promote the scientific research development and application of MWD.

[0096] Example 2

[0097] Based on Example 1, this embodiment provides a drilling rig test system for acquiring test data in the drilling torque and thrust prediction method of Example 1. This system has two states.

[0098] like Figure 1 FIG. 1 is a schematic diagram of the structure of the system in the first state, which is used to obtain test data to construct the conversion formula of rotary hydraulic pressure and drilling speed to torque. FIG.

[0099] Figure 1 The components include a rotary hydraulic pressure sensor, a dynamic torque drilling speed sensor, a magnetic powder brake and a coupling.

[0100] The magnetic powder brake is a conventional commercially available magnetic powder brake that provides controllable rotation resistance through 220V current.

[0101] The rotary hydraulic sensor and the propulsion hydraulic sensor are respectively installed in the corresponding rotary hydraulic pipe and propulsion hydraulic pipe of the drilling rig through a three-way interface.

[0102] The dynamic torque drilling speed sensor is a common commercially available dynamic torque drilling speed sensor that can measure torque and drilling speed in real time and transmit the data to computer analysis software.

[0103] The coupling is a conventional coupling purchased on the market, and two couplings are required in total, one for connecting the magnetic powder brake and the dynamic torque drilling speed sensor, and the other for connecting the dynamic torque drilling speed sensor and the drill rod of the drilling rig.

[0104] The coupling port needs to be customized according to the size and shape of the corresponding equipment port. For example, the drill pipe is generally a cylinder or a regular hexagonal prism, and the ports of the magnetic powder brake and dynamic torque drilling speed sensor are generally cylindrical metal rods.

[0105] Before starting the experiment, you need to Figure 1 The installation method of the components connects the magnetic powder brake, the dynamic torque drilling speed sensor and the drilling rig drill pipe together through two couplings.

[0106] like Figure 2 Shown is a schematic structural diagram of the second state of the system, which is used to obtain test data to construct a conversion formula for propulsion hydraulic pressure and thrust.

[0107] Figure 2 Components include propulsion hydraulic sensors and pressure sensors.

[0108] The pressure sensor is a conventional commercially available pressure sensor that can directly measure pressure and transmit the data to computer analysis software.

[0109] The propulsion hydraulic pressure sensor is a conventional hydraulic pressure sensor purchased on the market. By installing it on the propulsion hydraulic oil pipe, it can directly measure the propulsion hydraulic pressure of the drilling rig.

[0110] Before starting the test, you need to follow Figure 2 As described above, a pressure sensor is mounted on a test bench and placed in front of the drill bit. By controlling the drilling rig's propulsion controller, the drill bit contacts the pressure sensor, exerting pressure on it. This pressure is recorded in Newtons (unit: N). Simultaneously, the propulsion hydraulic pressure sensor, installed in the drilling rig's propulsion hydraulic oil pipe, records the hydraulic pressure (unit: MPa).

[0111] In summary, the present invention relates to a method for hydraulically converting torque and thrust that can be used on any hydraulic drilling rig. This method only requires collecting test data in advance through a test system to derive a conversion formula. The test system includes a hydraulic sensor, a pressure sensor, a magnetic powder brake, and a dynamic torque and speed sensor. The derived conversion formula can then be used to derive the true torque and thrust by monitoring the hydraulic pressure during actual drilling, thereby achieving the true collection of mechanical data for while-drilling monitoring. Furthermore, the test method only needs to be performed once for each drilling rig, and the resulting conversion formula can be permanently applied to that drilling rig, unaffected by drill bit wear or replacement of parts such as drill rods.

[0112] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A drilling torque and thrust prediction method based on drilling rig hydraulics, characterized in that: By collecting the rotary hydraulic pressure, propulsion hydraulic pressure and drilling speed data of the drill rig, and using the fitted drilling torque prediction formula and thrust prediction formula, the predicted torque and thrust are obtained to achieve online prediction. The process of constructing the drilling torque prediction formula includes the following steps: Through the test, the target drilling rig obtains the actual measured rotary hydraulic pressure, drilling speed and torque data over a period of time under various rotary hydraulic gear positions and rotary resistance combinations; The rotational hydraulic pressure, drilling speed and torque data are averaged in the time dimension and fitted in the combined dimension to obtain a drilling torque prediction formula based on hydraulic pressure and drilling speed; The process of constructing the thrust prediction formula includes the following steps: Through the test, the propulsion hydraulic pressure and drill bit pressure data of the target drilling rig were measured over a period of time under various combinations of rotary hydraulic gears and rotary resistance. The propulsion hydraulic pressure and drill bit pressure data are averaged in the time dimension and fitted in the combination dimension to obtain the thrust prediction formula based on the propulsion hydraulic pressure. In the process of fitting the drilling torque prediction formula, the fitting process in the combined dimension includes the following steps: In the combination dimension, for each combination of rotary hydraulic gear and rotary resistance, based on the rotary hydraulic pressure, drilling speed and torque data averaged over time, a linear fitting formula is obtained for the average torque-average rotary hydraulic pressure at the same drilling speed. Based on the linear intercept of the average torque-average rotational hydraulic pressure fitting formula, a linear intercept-average drilling speed fitting formula is obtained by linear fitting; Based on the average torque-average rotational hydraulic pressure fitting formula and the linear intercept-average drilling speed fitting formula, a thrust prediction formula based on propulsion hydraulic pressure is obtained.

2. The drilling torque and thrust prediction method based on drilling rig hydraulics according to claim 1, characterized in that: The average torque-average rotation hydraulic fitting formula is: in, 、 are the average torque, average rotational hydraulic pressure, 、 are the linear slope and linear intercept respectively.

3. The drilling torque and thrust prediction method based on drilling rig hydraulics according to claim 1, characterized in that: The linear intercept-average drilling speed fitting formula is: in, 、 are the linear slope and linear intercept, respectively. is the average drilling speed.

4. The drilling torque and thrust prediction method based on drilling rig hydraulics according to claim 1, characterized in that: The thrust prediction formula is: in, 、 、 They are average torque, average rotary hydraulic pressure, and average drilling speed, 、 is the linear slope.

5. The drilling torque and thrust prediction method based on drilling rig hydraulics according to claim 1, characterized in that: The thrust prediction formula is: in, 、 They are propulsion hydraulics, thrust, is the linear slope.

6. The drilling torque and thrust prediction method based on drilling rig hydraulics according to claim 1, characterized in that: Also includes: The performance of the drilling rig is evaluated based on the linear slope obtained from the fitting formula.

7. The drilling torque and thrust prediction method based on drilling rig hydraulics according to claim 1, characterized in that: When measuring the rotational hydraulic pressure, drilling speed and torque data, measurement starts from the combination corresponding to the minimum rotational hydraulic pressure gear and the minimum rotational resistance; when measuring the propulsion hydraulic pressure and drill bit pressure data, measurement starts from the combination corresponding to the minimum propulsion hydraulic pressure.

8. A drilling rig test system, characterized in that: Used to achieve the acquisition of test data in the drilling torque and thrust prediction method based on drilling rig hydraulics as described in any one of claims 1-7, The drilling rig test system, in a first state, comprises: A magnetic powder brake (1) for providing rotational resistance to the drilling rig; A dynamic torque drilling speed sensor (2) is connected to the magnetic powder brake (1) and one end of the drilling rig drill rod (6) respectively, and is used to measure real-time torque and drilling speed; A rotary hydraulic pressure sensor (3) connected to a hydraulic component of a drill pipe (6) of a drilling rig for measuring real-time rotary hydraulic pressure; The drilling rig test system, in the second state, comprises: A pressure sensor (4) is used to measure the real-time pressure of the drilling rig drill pipe (6); The propulsion hydraulic pressure sensor (5) is connected to the hydraulic component of the drilling rig drill pipe (6) and is used to measure the real-time propulsion hydraulic pressure.

9. A drilling rig test system according to claim 8, characterized in that: In the first state, it also includes: A first coupling is connected to the magnetic powder brake (1) and the dynamic torque drilling speed sensor (2) respectively; The second coupling is connected to the dynamic torque drilling speed sensor (2) and the drilling rig drill rod (6) respectively.

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