Calibration method for continuous measurement mode of small-bore directional gyro inclinometer
A technology of gyro inclinometer and calibration method, which is applied in the directions of measurement, earthwork drilling and production, borehole/well components, etc., and can solve problems such as difficult to determine, time-consuming accuracy, etc.
Inactive Publication Date: 2014-03-26
CHONGQING HUAYU ELECTRIC GRP
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Problems solved by technology
In the prior art, there is no established calibration method for the calibration of the inclinometer used for drilling, and it is usually time-consuming and difficult to determine the accuracy of the calibration based on experience.
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[0081] The present invention provides a continuous measurement mode calibration method for a small-aperture directional gyroscope inclinometer, which includes the following steps: step 1) establish a mathematical model of the table input-output relationship; step 2) establish a mathematical model of the gyro input-output relationship; step 3) adopt three The axis turntable calibrates the inclinometer through the velocity test and the six-position test; step 4) uses the mathematical model of steps 1) and 2) to use computer-assisted programs to measure 36 sets of velocity data and 6 sets of position data measured in step 3) Process and calculate the scale factor, installation error and static drift coefficient of the output inclinometer gyroscope. The calibration method of the invention can quickly and effectively calibrate the gyro inclinometer, the model estimation is accurate and effective, the operation is simple, the calibration of all parameters can be completed in a short t...
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The invention provides a calibration method for a continuous measurement mode of a small-bore directional gyro inclinometer. The method provided by the invention comprises the following steps: 1) establishing tabled input and output relation mathematical model; 2) establishing a gyro input and output relation mathematical model; 3) calibrating the inclinometer by adopting a three-axle table through a velocity test and a six-position test; and 4) processing 36 groups of velocity data and 6 groups of position data measured in the step 3) through a computer assisted program by utilizing the mathematical models in the steps 1) and 2), and computing and outputting the gyro scale factors, installation errors and static drifting coefficients of the inclinometer. In the calibration method provided by the invention, the gyro inclinometer can be rapidly and effectively calibrated; the evaluation of the models is accurate and effective; the operation is simple; the calibration of all parameters can be completed in a short time; and the reliability is high.
Description
Technical field [0001] The invention relates to a calibration method of a continuous measuring gyroscope inclinometer for drilling, and belongs to the technical field of electromechanical control. Background technique [0002] Directional drilling is one of the major technologies for oil and gas development, and it has been applied in some developed countries abroad. Inclinometers and directional instruments used in directional drilling include various magnetic instruments and frame-type gyro instruments. These two conventional measurement technologies have achieved certain results after decades of improvement, but they have not met the requirements for small-diameter drilling measurements. Especially the magnetic meters (such as fluxgates) that are still widely used in our country are affected by the geology and surrounding ferromagnetic material environment, so the measurement accuracy is very low, or even cannot be used. The general frame-type gyro meters are not only low in ...
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IPC IPC(8): E21B47/02
Inventor 谢箭王福亮李红良
Owner CHONGQING HUAYU ELECTRIC GRP