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 inconvenient maintenance and upgrade, difficult communication functions, affecting the measurement depth, etc. Effect

Active Publication Date: 2009-09-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

4. The impedance matching between the transmitting device and the transmission medium is fixed, and the adaptability to different electromagnetic environments is poor, thus affecting the measurement depth
3. The solenoid coil is driven by an LC series resonant circuit to transmit signals. The impedance matching between the transmitting device and the transmission medium is fixed, and the adaptability to different electromagnetic environments is poor, thus affecting the measurement depth
Various functions of wireless transmission are realized through hardware circuits, so it is inconvenient to maintain and upgrade, and it is difficult to adjust communication functions online
2. The amplified signal is directly transmitted through the signal emitter, the impedance matching between the transmitting device and the transmission medium is fixed, and the adaptability to different electromagnetic environments is poor, thus affecting the measurement depth

Method used

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

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Embodiment Construction

[0048] figure 1 It is a schematic diagram of the device structure of the present invention; figure 2 It is a schematic diagram of the principle structure of the components of the present invention;

[0049] Among them, a downhole signal transmitting device of an electromagnetic measurement-while-drilling system includes an upper drill string 1 and a lower drill string 4, and an adjustment joint 9 and an insulating joint 2 are included in the middle of the upper drill string 1 and the lower drill string 4; The upper drill string 1 and the lower drill string 4 are used to form an asymmetric dipole antenna;

[0050] The transmitting device also includes a transmitter part 5, a power supply part 6 and a measuring part 7; the above-mentioned three parts are respectively fixed and arranged inside the upper and lower drill strings; the transmitter part 5 includes a single-chip microcomputer, a power amplifier and an impedance converter; The transmitter component 5 is used to encod...

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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 and the 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.

Description

technical field [0001] The invention belongs to measuring instruments in fields such as oil fields and mines, in particular 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, MWD systems at home and abroad generally use drilling fluid pulses to transmit measurement data. This MWD technology can work stably and reliably in liquid drilling fluids, and is widely used in drilling engineering and plays an important role. However, for gas and various aerated drilling fluids, due to the strong compressibility of the fluid, the drilling fluid pulse signal is very 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-MWD) is a new technology that entered industrial application in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/12E21B47/13
Inventor 刘修善杨春国侯绪田高炳堂
Owner CHINA PETROLEUM & CHEM CORP
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