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Ground signal receiving device for electromagnetic measurement while drilling system and receiving method thereof

A measurement-while-drilling, ground signal technology, applied in the directions of measurement, earth-moving drilling, wellbore/well components, etc., to improve the receiving capacity, expand the function and scope of application, and increase the depth of measurement

Active Publication Date: 2009-09-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Signal demodulation processing adopts the traditional technical method of hardware FSK demodulator and detector, and can only receive signals using FSK modulation

Method used

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  • Ground signal receiving device for electromagnetic measurement while drilling system and receiving method thereof
  • Ground signal receiving device for electromagnetic measurement while drilling system and receiving method thereof
  • Ground signal receiving device for electromagnetic measurement while drilling system and receiving method thereof

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Effect test

Embodiment Construction

[0052] The receiving device of the present invention includes: a signal receiving end, a signal processing unit and a signal output unit.

[0053] The signal receiving end is a ground receiving antenna group, including an electromagnetic signal receiving antenna and an interference noise receiving antenna, which are respectively used to receive electromagnetic signals transmitted downhole, ground interference signals and well site interference noise signals;

[0054] The signal processing unit includes a dual-channel signal coupler, a dual-channel programmable preamplifier, a dual-channel signal conditioner, a dual-channel A / D converter, a DSP circuit and a power supply;

[0055] The output unit is used to output the signal of the signal processing unit through the communication port;

[0056] The signals received by the electromagnetic signal receiving antenna and the interference noise receiving antenna are sequentially processed through a dual-channel signal coupler, a dual...

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PUM

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Abstract

The invention relates to a device in an electromagnetic measurement while drilling system for receiving an electromagnetic signal with measurement data information sent underground on the ground and transmitting the signal to a data processing computer, and a method thereof. The device uses two antennas in a well field to receive an electromagnetic signal sent underground and a well field noise signal respectively; and the two signals enter a program controlled low noise preamplifier to be amplified through the coupling of an impedance converter, then enter a signal conditioning module for processing, and then enter a digital signal processing module through analog-to-digital conversion, and finally data is transmitted to a computer terminal through an interface module. The device is matched with a downhole electromagnetic signal transmitter to form the electromagnetic measurement while drilling system to form the information communication between underground and ground. The electromagnetic measurement while drilling system is not affected by drilling fluid medium, can perform data transmission without circulating a drilling fluid under any working condition, and can solve the measurement while drilling problem in gas drilling and aerated drilling.

Description

technical field [0001] The invention belongs to a measurement-while-drilling instrument used in the exploration and development of mineral and petroleum resources, such as a measurement-while-drilling instrument (MWD), a logging-while-drilling instrument (LWD) and the like. In particular, it relates to a device and method for receiving an electromagnetic signal carrying measurement data information sent from downhole on the ground in an electromagnetic measurement-while-drilling system, and transmitting it to a data processing computer. Background technique [0002] In drilling projects such as petroleum, mining, and geological exploration, in order to accurately grasp the formation information and make the well trajectory drill according to the engineering design requirements, it is necessary to measure geological and engineering data in time. In addition, the data collected by various sensors needs to be transmitted to the ground in real time. This real-time data measurem...

Claims

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Application Information

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IPC IPC(8): E21B47/12E21B47/13
Inventor 刘修善高炳堂杨春国侯绪田涂玉林
Owner CHINA PETROLEUM & CHEM CORP
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