Sensor orthogonal calibration method for oil drilling measurement

A technology of drilling measurement and calibration method, which is applied in the field of petroleum drilling engineering, can solve the problems that the 3 sensitive axes cannot be strictly orthogonal, and the electrical performance of the 3-axis sensitivity is symmetrical, so as to improve the precision, reduce the workload and realize the temperature compensation Effect

Active Publication Date: 2013-03-06
SCHLUMBERGER JHP OILFIELD TECH SHANDONGCO
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Problems solved by technology

In practice, even if the 3 acceleration sensors and 3 fluxgate sensors are fine-tuned, due to installation reasons, errors in measurement vision, etc., deviations caused by non-orthogonal sensitive axes cannot be avoided
[0004] But in fact, limited by the processing technology and installation technology level, the three sensitive axes in the actual sensor cannot be stric

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  • Sensor orthogonal calibration method for oil drilling measurement
  • Sensor orthogonal calibration method for oil drilling measurement
  • Sensor orthogonal calibration method for oil drilling measurement

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[0017] The present invention will be further described below in conjunction with the drawings.

[0018] An orthogonal calibration method for sensors for oil drilling detection. A program compiled according to the algorithm runs on a computer. The orthogonal calibration method is:

[0019] The first step: select the accelerometer and fluxgate that meet the requirements for use. At room temperature, the deflection value of the acceleration sensor is less than 15mg, and the deflection value of the fluxgate is less than 3nT;

[0020] Step 2: After installing the acceleration sensor and the fluxgate on the instrument skeleton, simply adjust them so that the sensor's sensitive axis and the instrument coordinate system coordinate axis are basically coaxial;

[0021] Step 3: Establish a mathematical model of sensor orthogonal calibration,

[0022]

[0023] V g Output voltage value for each meter, K Is the scaling factor, G Is the acceleration of gravity in the instrument coordinate system x ,...

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Abstract

The invention discloses a sensor orthogonal calibration method for oil drilling measurement. The method comprises the following steps of: selecting an acceleration sensor and a flux gate which conform to use requirements, arranging the acceleration sensor and the flux gate on an instrument framework, and simply regulating to enable the coordinate axes of an instrument coordinate system to be basically coaxial with the sensing shaft of the sensor; then arranging instruments into 12 specific gestures according to an established mathematical model, so as to obtain orthogonal calibration coefficients of the sensor; calculating one group of orthogonal calibration coefficients at an temperature interval under a heating state till the specific temperature; carrying out temperature compensation on orthogonal calibration coefficients by utilizing nonlinear fitting; and enabling the calibrated sensing shaft of the sensor to be accurately coaxial with the coordinate axes of the instrument coordinate system by virtue of software. By utilizing the method, the calibrated sensing shaft of the sensor is accurately coaxial with the coordinate axes of the instrument coordinate system by virtue of software, thermal compensation is realized, and the original instrument calibration method is improved.

Description

technical field [0001] The invention belongs to the field of petroleum drilling engineering, in particular to a method for orthogonal calibration of a sensor used for petroleum drilling measurement. Background technique [0002] At present, Measurement While Drilling (MWD) and Logging While Drilling (LWD) systems have become an indispensable part of petroleum drilling engineering, and the acquisition of downhole data is even more important. In geological exploration, in order to be able to determine the lateral dip and dip azimuth of the formation, it is necessary to continuously measure the dip and dip azimuth of the wellbore and the azimuth of the downhole tool as a reference mark. When carrying out secondary drilling or drilling horizontal wells, it is necessary to know the well trajectory and the position of the drill bit to adjust the next drilling direction. Therefore, whether it is after the completion of the well or during the drilling process, high-precision contin...

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Application Information

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IPC IPC(8): G01C25/00
Inventor 吴俊杰柏险峰顾鹏王亮王纪昌
Owner SCHLUMBERGER JHP OILFIELD TECH SHANDONGCO
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