CN111075424B - A method for correcting measurement results of measurement-while-drilling parameters - Google Patents

Abstract

The invention provides a method for correcting measurement results of measurement parameters while drilling, which relates to the technical field of mine drilling measurement and comprises the following steps: A. taking a large coal rock sample or manufacturing a similar material simulation coal rock sample; B. the indoor test measures the unit footage torque, the propelling force and the rotating speed of a drill rod at the tail end position and the drill bit position of the drill rod of the drilling machine while drilling; C. obtaining a fitting relation of each unit of footage attenuation of measurement parameters at the tail end position of the drill rod and the drill bit position by utilizing linear regression analysis, and determining a torque correction coefficient, a propulsion correction coefficient and a rotating speed correction coefficient; D. measuring actual unit footage torque, propelling force and rotating speed of the tail end position of a drill rod of the drilling machine on site, and determining measurement parameters at the actual drill bit position by combining a correction coefficient and an indoor test approximate ratio; the technical problem that errors exist in the measurement parameters of the tail end of a drill rod of a drilling machine during mine drilling construction, particularly long drilling, is solved, and the method has the advantages of convenience in measurement construction and the like.

Description

A method for correcting measurement results of measurement-while-drilling parameters

technical field

The invention relates to the technical field of mine borehole measurement, in particular to a method for correcting measurement results of measurement-while-drilling parameters.

Background technique

In the process of coal mining, drilling is an important technical means for collecting hydrogeological data, observing stratum structure, exploring water, and pumping gas. In addition, when drilling, information such as rock mechanics parameters is indirectly obtained according to parameters such as the cutting force of the drill bit and the torsion of the drill pipe, which plays a greater role in ensuring engineering safety.

At present, the application of measurement while drilling includes sensor measurement of drilling parameters of drilling rigs and auxiliary probe measurement while drilling, etc. Generally, the drilling parameters are measured at the end of the drill pipe of the drilling rig, or the drilling parameters at the position of the drill bit are measured through auxiliary devices and sensors. enter parameters. However, due to the extrusion and friction of the drill pipe by the drilling confining pressure during the drilling process, the measured parameters will be lower than the actual values, resulting in large deviations in the test results.

During the drilling process of the drill pipe measured while drilling, the accurate values of parameters such as torque, propulsion force, and rotational speed should be based on the vicinity of the drill bit. Due to the complex environment on site, parameter attenuation often occurs from the drill pipe to the drill bit. The degree increases with the drilling depth. In view of the difficulty and high cost of obtaining measurement parameters for the drill bit in the prior art, a method for improving and correcting the test results of the measurement parameters while drilling is proposed. Drilling measurement errors are eliminated, and the accuracy of drilling utilization and rock parameter determination is improved.

Contents of the invention

In order to solve the technical problem that there is an error in the drill pipe measurement parameter as the drilling measurement parameter in the drilling cuttings method or the drilling pressure relief process in coal mining, improve the drilling utilization rate and the accuracy of rock parameter determination, the present invention provides a A method for correcting measurement results of measurement-while-drilling parameters, the specific technical scheme is as follows.

A method for correcting measurement results of measurement-while-drilling parameters, the steps comprising:

Step A. get bulk coal rock sample or make similar material simulation coal rock sample;

Step B. indoor test while drilling to measure the unit footage torque, unit footage propulsion force, and unit footage speed measurement parameters of the drill pipe at the drill pipe end position and the drill bit position of the drilling rig;

Step C. Using linear regression analysis to obtain the fitting relationship between the end position of the drill pipe and the attenuation of the measured parameter per unit footage at the drill bit position, and determine the torque correction coefficient K _M1 , the thrust correction coefficient K _N1 and the rotational speed correction coefficient K _V1 ;

Step D. Measure the actual unit footage torque M, the actual unit footage thrust N, and the actual unit footage speed V _of the drill pipe end position of the drilling rig on the mine site, and _determine the actual drill bit position in _combination with the correction coefficient and the approximate ratio of the indoor test. measurement parameters.

Preferably, the simulation ratio between the indoor test and the mine site is 1:10 to 1:5, and the approximate ratio of simulation to reality is 0.94 to 0.99, and the approximate ratio is positively linearly related to the simulation ratio; when the simulation ratio is 1: At 10 o'clock, specifically, in the indoor test, the drill bit footage was taken as 0.1m, as the calculation basis for the unit footage, and 1m was actually taken as the calculation basis for the unit footage at the mine site.

Preferably, the torque correction coefficient K _M1 is calculated as:

K _M1 ＝The measured value of torque at the end of the drill pipe/the measured value of the torque at the position of the drill bit;

The calculation of the propulsion correction coefficient K _N1 is:

K _N1 = measured value of propulsive force at the end of the drill pipe in the laboratory test unit footage/measured value of propulsive force at the position of the drill bit;

The calculation of the rotational speed correction coefficient K _V1 is:

K _V1 ＝Indoor test unit Footage The rotational speed measurement value of the end of the drill pipe/The measurement value of the propulsion force of the drill bit position.

It is also preferred that the measured parameters at the actual drill bit position include the unit footage torque M at the actual drill bit position, the actual unit footage thrust N, and the actual unit footage speed V, wherein:

M=( _Mnow /K _M1 )×approximate ratio; N=( _Nnow /K _N1 )×approximate ratio; V=( _Vnow /K _V1 )×approximate ratio.

The beneficial effects of the present invention are:

(1) Accurately determine the relationship between the measurement parameters of torque, propulsion force and rotational speed at the end of the drill pipe and the position of the drill bit through indoor tests, and then determine the correction coefficient, restore the actual drilling measurement parameters on site according to the correction coefficient and the approximate ratio, and reduce the measurement Errors in the process improve the accuracy, reliability and scientificity of in-situ testing.

(2) The indoor test measurement is more accurate, no need to change the existing drilling technology and drilling equipment, the calculation is simple and fast, and the application range is wide, and it can be used for measurement while drilling under various rocks or complex conditions.

Description of drawings

Fig. 1 is a principle flow chart of the method for correcting measurement results of measurement parameters while drilling;

Fig. 2 is the parameter correction coefficient curve schematic diagram in embodiment 1;

FIG. 3 is a schematic diagram of parameter correction coefficient curves in Embodiment 2. FIG.

Detailed ways

Referring to FIGS. 1 to 3 , a method for correcting measurement results of measurement-while-drilling parameters provided by the present invention is specifically implemented as follows.

Based on the existing measurement-while-drilling technology that relies on sensors to collect measurement-while-drilling parameters, in order to reduce the error between the test value and the actual value and improve the test accuracy of the field measurement-while-drilling parameters, the measurement-while-drilling parameter value of the outer end of the drill pipe and the measurement node sensor The parameter values measured while drilling are fitted and corrected to obtain a correction coefficient, which is related to the length of the drill pipe and the drilling depth, and can be obtained from laboratory tests and field measurements. Applying this correction factor to the field engineering test can achieve the purpose of correcting the test results of the field measurement while drilling parameters.

Example 1

A method for correcting measurement results of measurement-while-drilling parameters, the steps comprising:

Step A. Take a large coal rock sample or make a similar material to simulate a coal rock sample. Specifically, large coal samples are taken on site and transported to the laboratory, or coal samples of similar materials with consistent mechanical properties are arranged in the laboratory; sensors are used in the laboratory to measure parameters such as torque at the end of the drill pipe and the position of the drill bit. monitor.

Step B. Indoor test While drilling, the measuring parameters of torque per unit footage, propulsive force per unit footage and rotational speed per unit footage of the drill pipe at the position of the end of the drill pipe and the position of the drill bit of the drilling rig are measured.

Since the size of the indoor test is smaller than the actual site, the simulation ratio between the indoor test and the actual mine site is 1:10 to 1:5, which is convenient for the indoor test. There is an approximate ratio between the indoor simulation and the actual structure, and the approximate ratio can be 0.94 ~0.99, where the approximate ratio is positively linearly correlated with the simulation ratio. When the simulation ratio is 1:10, the approximate ratio is 0.94. The approximate ratio is obtained by summarizing the actual experience of simulation tests on similar materials. When the simulation ratio is 1:10, specifically, in the indoor test, 0.1m of drill bit footage is taken as the calculation basis of unit footage, and 1m is actually taken as the calculation basis of unit footage in the mine site.

Step C. Using linear regression analysis to obtain the fitting relationship between the end position of the drill pipe and the attenuation per unit footage of the measured parameters at the drill bit position, and then determine the torque correction coefficient K _M1 , the thrust correction coefficient K _N1 and the rotational speed correction coefficient K _V1 .

The calculation of the torque correction factor K _M1 is:

K _M1 ＝The measured value of torque at the end of the drill pipe/the measured value of the torque at the position of the drill bit;

The calculation of propulsion correction coefficient K _N1 is:

K _N1 = measured value of propulsive force at the end of the drill pipe in the laboratory test unit footage/measured value of propulsive force at the position of the drill bit;

The calculation of speed correction coefficient K _V1 is:

K _V1 ＝Indoor test unit Footage The rotational speed measurement value of the end of the drill pipe/The measurement value of the propulsion force of the drill bit position.

Step D. At the mine site, measure the actual unit footage torque M, the actual unit footage thrust N, and the actual unit footage speed V _at the end of the drill pipe of the drilling rig, and _determine the actual drill bit in combination with the correction coefficient and the approximate ratio of the indoor test _. The measured parameters at the location.

Due to the length of the drill holes set by the drilling cuttings method monitoring and drilling pressure relief in mines, it is necessary to connect 8-10 or more drill pipes to meet the drilling requirements, so the torque and thrust at the actual drill bit position There is a large difference between the measured parameters of the speed and rotational speed and the measured parameters of the end of the drill pipe. The measured parameters at the actual drill bit position include the unit footage torque M at the actual drill bit position, the actual unit footage thrust N, and the actual unit footage speed V, where:

M=( _Mnow /K _M1 )×approximate ratio; N=( _Nnow /K _N1 )×approximate ratio; V=( _Vnow /K _V1 )×approximate ratio.

The relationship between the torque, propulsion force and rotational speed measurement parameters at the end of the drill pipe and the position of the drill bit will be accurately determined through indoor tests, and then the correction coefficient will be determined, and the actual drilling measurement on site will be restored according to the correction coefficient and approximate ratio, reducing the error in the measurement process , improving the accuracy, reliability and scientificity of in-situ testing.

Example 2

According to the present embodiment, the test borehole is drilled according to the actual site, and then the correction coefficient is determined, and the actual drilling measurement parameters of the drill bit position on site are restored according to the correction coefficient.

Step 1. Reasonably select the location of the area to be tested on site, drill 2-5 drill holes at a position perpendicular to the coal wall, and conduct on-site measurement while drilling.

Step 2. Measure the parameters by setting sensors at the drill pipe and the drill bit position respectively. The drill bit position is connected to the sensor measurement joint, and the end of the drill pipe is also monitored by the sensor; and parameters such as rotational speed were measured. Choose a measurement method to measure the actual drilling parameters on site, and obtain the unit footage torque, unit footage thrust, and unit footage speed measurement parameters at the test drilling bit position and the drill end position.

Step 3. Compare the measured parameters at the drill bit position and the drill end position, and use linear regression analysis to fit the two groups of data to obtain the fitting relationship between the on-site drill bit position and the drill end position measurement parameters. The length of the drill pipe is related to the drilling depth. Using this fitting relationship, the parameters of the outer end of the drill pipe are corrected to obtain the torque correction coefficient K _M2 , the thrust correction coefficient K _N2 , and the rotational speed correction coefficient K _V2 .

Among them, the calculation of the torque correction coefficient K _M2 is:

K _M2 = Measured value of torque at the end of the drill pipe/measured value of torque at the position of the drill bit;

The calculation of propulsion correction coefficient K _N2 is:

K _N2 ＝ measured value of propulsive force at the end of the drill rod/measured value of propulsive force at the position of the drill bit;

The calculation of speed correction coefficient K _V2 is:

K _V2 ＝On-site measured unit footage The rotational speed measurement value of the end of the drill pipe/The measurement value of the propulsion force of the drill bit position.

Step 4. During subsequent actual borehole measurement while drilling, according to the correction coefficient of the test borehole, the parameters monitored at the outer end of the drill pipe can be multiplied by the corresponding correction coefficient according to the drilling depth and the length of the drill pipe, and then the corrected more accurate measurements.

The measured parameters at the actual drill bit position include the unit footage torque M at the actual drill bit position, the actual unit footage thrust N, and the actual unit footage speed V, where:

M=M _present /K _M2 ; N=N _present /K _N2 ; V=V _present /K _V2 .

Further, the correction parameters calculated in Example 1 can also be combined with the correction parameters obtained from the above-mentioned indoor test and test drilling for correction, and the calculated average value can be used as the actual measurement parameter on site to further improve the accuracy of the test.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.

Claims (2)

1. A method of correcting measurements of measurement-while-drilling parameters, comprising the steps of:

a, taking a large coal rock sample or manufacturing a similar material simulation coal rock sample;

b, measuring measurement parameters of unit footage torque, unit footage propulsive force and unit footage rotating speed at the tail end position of a drill rod and the position of a drill bit of the drilling machine in an indoor test while drilling;

c, obtaining a fitting relation of the measured parameters at the tail end position of the drill rod and the drill bit position per unit footage attenuation by utilizing linear regression analysis, and determining a torque correction coefficient K _M1 Coefficient of propulsion correction K _N1 And a rotation speed correction coefficient K _V1 ；

D, measuring the actual unit footage torque M of the tail end position of the drill rod of the drilling machine on the mine site _{Now that} Actual unit footage propulsive force N _{Now that} Actual unit footage speed V _{Now that} Determining a measurement parameter at the actual bit position by combining the correction coefficient and the indoor test approximation ratio;

the torque correction coefficient K _M1 Is calculated as:

K _M1 = torque measurement at end of footpipe/bit position of laboratory test unit;

the propulsive force correction coefficient K _N1 Is calculated as:

K _N1 = measured thrust at end of footpipe/measured thrust at drill bit position for unit trial in laboratory;

the rotation speed correction coefficient K _V1 Is calculated as:

K _V1 = rotation speed measurement at the end of the footage drill rod/thrust measurement at the drill bit position for laboratory test unit;

the measurement parameters at the actual bit position include a unit footage torque M, an actual unit footage thrust N, an actual unit footage rotational speed V at the actual bit position, wherein:

M=（M _{now that} /K _M1 ) X approximate ratio; n = (N) _{Now that} /K _N1 ) X approximate ratio; v = (V) _{Now that} /K _V1 ) X approximate ratio.

2. The method for correcting measurement while drilling parameter measurement results according to claim 1, wherein the simulation ratio between an indoor test and actual mine sites is 1 to 10 to 1, the approximate ratio of simulation to actual is 0.94 to 0.99, and the approximate ratio is positively linearly related to the simulation ratio; when the simulation ratio is 1.

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