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Title:
CALIBRATION METHOD FOR MEASUREMENT-WHILE-DRILLING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/231444
Kind Code:
A1
Abstract:
A calibration method for a measurement-while-drilling device; when measuring data at sea level, the calibration method comprises: horizontally suspending a measurement-while-drilling device; measuring amplitudes and phases at different heights; horizontally rotating the measurement-while-drilling device a plurality of times, and measuring amplitudes and phases at different heights after each horizontal rotation; and when the sum of the angles of the plurality of horizontal rotations is greater than 360 degrees, calculating an azimuth correction factor according to the measured amplitudes and phases. The calibration method for a measurement-while-drilling device is carried out on a wide seawater interface, so that the influence of boundary effect can be eliminated. Uniform medium properties of air and seawater can be simplified into a one-dimensional double-layer medium model, while an air-seawater environment ensures the consistency between a forward model and a measured environment. High air-seawater conductivity contrast can enhance azimuth signal strength. Moreover, by means of multi-angle measurement at different heights, the accuracy of calibration can also be greatly improved.

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Inventors:
LI XINGHAN (CN)
ZHANG WENXIU (CN)
CHEN WENXUAN (CN)
ZHENG JIAN (CN)
YUAN WENQIANG (CN)
ZHANG YALI (CN)
LI HONG (CN)
Application Number:
PCT/CN2023/075075
Publication Date:
December 07, 2023
Filing Date:
February 08, 2023
Export Citation:
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Assignee:
INST GEOLOGY & GEOPHYSICS CAS (CN)
International Classes:
G01V13/00; E21B49/00
Domestic Patent References:
WO2020101709A12020-05-22
Foreign References:
CN115016034A2022-09-06
CN104234696A2014-12-24
CN106869907A2017-06-20
CN107461191A2017-12-12
CN109025969A2018-12-18
CN205404034U2016-07-27
Attorney, Agent or Firm:
BEIJING ZOSER INTELLECTUAL PROPERTY OFFICE (CN)
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