Active magnetic field calibration method for measurement while drilling (MWD) directional probe

A calibration method and magnetic field technology, which can be used in earth-moving drilling, surveying, wellbore/well components, etc., and can solve problems such as harsh requirements and difficulty in shielding external electromagnetic interference.

Inactive Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the requirements for achieving a completely non-magnetic environment are very stringent, it is difficult to shiel

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  • Active magnetic field calibration method for measurement while drilling (MWD) directional probe
  • Active magnetic field calibration method for measurement while drilling (MWD) directional probe

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Embodiment Construction

[0015] Such as figure 1 As shown, the MWD directional probe active magnetic field calibration instrument that needs to be used in the present invention includes an industrial control computer 6, a current control module 7 (such as the programmable DC power supply produced by Taiwan ITECH: IT6122), a turntable control module 5, Data acquisition module 4 (such as NI USB-6212), three-axis Helmholtz coil 1, three-axis non-magnetic calibration turntable 2 (such as the model JST-700 three-axis non-magnetic turntable produced by the Institute of Optoelectronic Technology, Chinese Academy of Sciences), High-precision fluxgate sensor 3 (such as three-axis fluxgate sensor magnetic field measurement accuracy: ±1nT) and MWD directional probe tube 8 (such as accelerometer sensor slope measurement accuracy: ±0.05°).

[0016] The computer 6 is connected to the current control module 7, the current control module 7 is connected to the three-axis Helmholtz coil 1, the three-axis non-magnetic c...

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Abstract

The invention relates to an active magnetic field calibration method for a measurement while drilling (MWD) directional probe. According to the method, an MWD directional probe active magnetic field calibration instrument is used for calibration, and a high-accuracy fluxgate sensor and an MWD directional probe are arranged on a three-axis non-magnetic calibration rotation table; a computer controls a current module to produce current with certain power, a three-axis square Helmholtz coil is driven to produce a uniform magnetic field in a certain range in a central area to offset an earth magnetic field, and a non-magnetic space is formed in a certain range; the fluxgate sensor and the MWD directional probe detect signals, a data acquisition module acquires the signals, and the signals are transmitted to the computer; and calibration software on the computer are used for calculation and comparison to calibrate whether the current MWD directional probe has the qualification that the MWD can descend into the well to work normally. The method has the advantages of quickness, accuracy and stability.

Description

technical field [0001] The invention relates to the field of an active magnetic field calibration method for a MWD (measurement while drilling) directional probe used for oil drilling. Background technique [0002] In the oil drilling industry, with the increasing number of cluster wells, circumvention wells, multi-branch horizontal wells, and connected wells, the requirements for the magnetic azimuth measurement accuracy of oil drilling directional probes are getting higher and higher. Measurement accuracy directly affects the accuracy of borehole trajectory. Therefore, how to calibrate the measurement accuracy of the probe before construction to ensure the normal use of the measuring instrument has become an urgent problem to be solved. The current solution to this problem is to establish a non-magnetic calibration workshop to achieve it. However, the requirements for achieving a completely non-magnetic environment are very stringent, it is difficult to shield external e...

Claims

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Application Information

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IPC IPC(8): E21B47/02
Inventor 杨锦舟张海花李闪葛鹏殷鑫
Owner CHINA PETROLEUM & CHEM CORP
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