Downhole signal transmitting device for electromagnetic measurement while drilling system and transmitting method thereof

A measurement-while-drilling and signal transmission technology, applied in the field of signal transmitters, can solve the problems of difficult communication functions, inconvenient maintenance, upgrading, poor adaptability, etc., and achieve the effect of improving anti-interference performance, improving and upgrading convenience, and reducing costs.
CN101525997BActive Publication Date: 2012-10-17CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2012-10-17

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Abstract

The invention relates to a signal transmitting device for realizing wireless measurement while drilling. A downhole signal transmitting device for an electromagnetic measurement while drilling system comprises an upper drilling string and a lower drilling string, and an insulating joint is contained between the upper drilling string and the lower drilling string; and the upper drilling string andthe lower drilling string are used for forming an asymmetric dipole antenna. The transmitting device adopts software radio technology to realize various functions of wireless transmission; the impedance matching between a transmitter antenna and transmission medium is realized through an impedance converter; and the dipole antenna is adopted to transmit a measurement while drilling data signal. The device and the method improve the adaptive capacity and measurement depth of the electromagnetic measurement while drilling system to different strata.
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Description

technical field

[0001] The invention belongs to measuring instruments in industries such as oil fields and mines, and in particular relates to a signal transmitter for realizing wireless measurement while drilling. Background technique

[0002] In drilling engineering, measurement while drilling (MWD) is a core technology in wellbore trajectory monitoring and control. At present, measurement-while-drilling systems at home and abroad generally use drilling fluid pulses to transmit measurement data. This measurement-while-drilling technology can work stably and reliably in liquid drilling fluid, and has been widely used and played an important role in drilling engineering. However, for gas and various aerated drilling fluids, due to the strong compressibility of the fluid, the drilling fluid pulse signal is weak or even unable to generate an effective pulse signal, so the drilling fluid pulse MWD will not work normally.

[0003] Electromagnetic measurement while drilling (EM-...

Claims

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