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Calibration method for high-precision spot-measurement gyro inclinometer for well drilling

A technology of gyro inclinometer and calibration method, which is applied in the directions of surveying, earthwork drilling, wellbore/well components, etc.

Inactive Publication Date: 2013-07-10
CHONGQING HUAYU ELECTRIC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there is no spot measurement calibration method for related products

Method used

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  • Calibration method for high-precision spot-measurement gyro inclinometer for well drilling
  • Calibration method for high-precision spot-measurement gyro inclinometer for well drilling
  • Calibration method for high-precision spot-measurement gyro inclinometer for well drilling

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Embodiment Construction

[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0066] A method for calibrating a high-precision spot measuring gyro inclinometer for drilling, the method comprising the following steps:

[0067] (1), fix the inclinometer with two two-degree-of-freedom flexible gyroscopes and three quartz accelerometers on a three-axis turntable (such as figure 1As shown in the figure, 1 is the coordinate axis of the inclinometer, 2 is the inner rod axis, 3 is the middle rod axis, and 4 is the outer rod axis), so that the three axes of the inclinometer gyro form a right-handed coordinate system, and two of them are the X axis Keep horizontal with the Y axis, and the third axis Z axis is perpendicular to the ground.

[0068] (2) Carry out eight-position calibration, and the acceleration of gravity refers to +1g:

[0069] Position 1: Place the Z axis facing the sky, the X axis in the east direction...

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Abstract

The invention discloses a calibration method for a high-precision spot-measurement gyro inclinometer for well drilling. The calibration method comprises the following steps of: (1) fixing an inclinometer provided with two two-degree-of-freedom flexible gyros and three quartz accelerometers on a triaxial turntable to make three axes of the gyros of the inclinometer form a right-hand coordinate, wherein two axes, namely the X-axis and the Y-axis, are kept horizontal, and a third axis, namely the Z-axis is vertical to the ground; (2) carrying out eight-position calibration and recording voltage signals output by the gyros of the inclinometer; and (3) substituting all the voltage signals into formulas shown in the specification to solve the calibration parameters of the gyro inclinometer. By utilizing an eight-position spot measurement method in the invention, a testing process is greatly simplified, data are automatically read and stored, the operation is simple and the computing processis completed by a computer; and a reliable spot-measurement type eight-position calibration method for the inclinometer is designed by the invention and has the advantages of strong reliability and practicability as well as higher efficiency and accuracy.

Description

technical field [0001] The invention relates to a calibration method for a gyroscope inclinometer, in particular to a calibration method for a high-precision spot measuring gyroscope inclinometer for drilling. Background technique [0002] In a 1g gravitational field, the torque feedback test is the simplest and most practical method for testing the inclinometer gyro drift, sometimes also called the torque rebalancing method. Precision optical dividing head and high-precision speed turntable can be used as test equipment for this kind of test. The so-called calibration is the process of determining the error coefficient by comparing the output value of the gyro inclinometer with the known reference information, so that the output conforms to the reference information within its value range. [0003] At present, there is no spot measurement calibration method for related products. Contents of the invention [0004] In view of the above-mentioned deficiencies in the prior ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/02
Inventor 谢箭王福亮李红良
Owner CHONGQING HUAYU ELECTRIC GRP