Single-axis constant magnetic calibration method for MWD (Measurement While Drilling) guide probe
A calibration method and single-axis technology, applied in the calibration field, can solve problems such as magnetic field distribution distortion, probe azimuth error, and difficulty in finding
Pending Publication Date: 2022-03-25
大庆随钻科技有限公司
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Problems solved by technology
Because the geomagnetic elements are not constant in space and time, that is, the calibration standard is not constant, which will cause a certain error in the orientation of the probe tube. Moreover, it is difficult to find in a completely non-magnetic environment in the city. , metal components, and moving vehicles will cause distortion of the magnetic field distribution, so it is difficult to achieve a completely non-magnetic environment, and it is difficult to accurately calibrate the measurement accuracy of the probe tube
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Embodiment 2
[0029] refer to figure 2 , the MWD guided probe single-axis constant magnetic calibration instrument that implements the calibration method mainly includes a three-axis Helmholtz coil, a three-axis non-magnetic calibration turntable, an MWD directional probe, a high-precision fluxgate sensor, a current control module, and a turntable control module, a data acquisition module and a computer; the computer performs data transmission with the current control module, the turntable control module and the data acquisition module respectively, the data acquisition module MWD directional probe and the high-precision fluxgate sensor perform data transmission, and the current control module communicates with the The three-axis Helmholtz coil performs data transmission, and the turntable control module performs data transmission with the three-axis non-magnetic calibration turntable.
[0030] The uniaxial constant magnetic calibration method for MWD guided probe is based on the MWD guide...
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The invention relates to a calibration method, in particular to a uniaxial constant magnetic calibration method for an MWD (Measurement While Drilling) guide probe, which comprises the following steps of: arranging a pair of same parallel and coaxial Helmholtz coils on a three-axis non-magnetic calibration table, and arranging a fluxgate sensor on the MWD guide probe; the azimuth plane of the three-axis non-magnetic calibration table is perpendicular to the direction of an earth magnetic field so as to eliminate interference of the earth magnetic field, the magnetic field is sampled through an upper computer when the magnetic field is not added, then current in the same direction is supplied to a pair of Helmholtz coils through a constant current source so as to generate a positive magnetic field, and the magnetic field is sampled at the moment; and finally, a negative magnetic field is generated through a constant current source, then data sampling is carried out, calibration of the X axis is completed through three sets of collected data, and then calibration of the Y axis and the Z axis is carried out through the same steps. The calibration method has the advantages of rapidness, accuracy and stability.
Description
technical field [0001] The invention relates to a calibration method, in particular to a MWD guided probe tube single-axis constant magnetic calibration method. Background technique [0002] In the oil drilling industry, the calibration of the fluxgate sensor of the guide probe is usually carried out in a non-magnetic environment, using the magnetic field of the earth itself to calibrate. Since the geomagnetic elements are not constant in space and time, that is, the calibration standard is not constant, this will cause a certain error in the orientation of the probe tube, and it is difficult to find in a completely non-magnetic environment in the city. , metal components, and moving vehicles will cause distortion of the magnetic field distribution, so it is difficult to achieve a completely non-magnetic environment, and it is difficult to accurately calibrate the measurement accuracy of the probe. Therefore, it is necessary to design a uniaxial constant magnetic calibratio...
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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 刘江刘伟
Owner 大庆随钻科技有限公司