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Underground coal mine logging-while-drilling tool based on electromagnetic wave resistivity and measuring method thereof

A technology of resistivity logging and measurement methods, which is applied in wellbore/well components, earthwork drilling, construction, etc., can solve problems such as inapplicability, and achieve the effect of low power consumption

Active Publication Date: 2015-11-04
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

Petroleum electromagnetic wave resistivity logging instruments and their measurement methods cannot be applied in coal mines

Method used

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  • Underground coal mine logging-while-drilling tool based on electromagnetic wave resistivity and measuring method thereof
  • Underground coal mine logging-while-drilling tool based on electromagnetic wave resistivity and measuring method thereof

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Electromagnetic wave resistivity instruments in the petroleum industry usually have a large outer diameter. On the premise that the strength requirements while drilling can be met, grooves can be carved on the outer wall of the drill collar for placing circuit boards. The electromagnetic wave resistivity instrument proposed by the present invention is designed to meet the measurement of most boreholes in coal mines. The outer diameter of the designed instrument is φ73mm. In order to meet the strength requirements while drilling, a measuring nipple is designed. The pup joint is a closed structure, which can withstand 12MPa water pressure, and a circuit board is placed inside; in the design of the circuit board, a small package chip is selected, and a multi-layer board is designed to reduce the size of the circuit board and save space.

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Abstract

The invention discloses an underground coal mine logging-while-drilling tool based on electromagnetic wave resistivity comprising a power supply circuit module, a transmitter module, a reception and preprocessing module and a digital signal processing module. The power supply circuit module is connected to the transmitter module, the reception and preprocessing module and the digital signal processing module. The transmitter module and the reception and preprocessing module are both connected to the digital signal processing module. The invention discloses a measuring method of the underground coal mine logging-while-drilling tool based on electromagnetic wave resistivity. By use of electromagnetic wave propagation in media, relative change of two characteristic parameters (phase difference and amplitude ratio) of an electromagnetic field is measured. The tool does not rely on well fluid as transmission medium so that the tool can be applied to dry hole measurement or high resolution and deep detection requirement.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave resistivity logging while drilling in coal mines, and in particular relates to an electromagnetic resistivity logging instrument while drilling in coal mines and a measuring method thereof. Background technique [0002] Under the coal mine, the current drilling process is as follows: firstly, through comprehensive research on regional geology, seismic, electrical methods and other data, combined with the requirements of engineering construction, the drilling trajectory is designed, and then handed over to the on-site construction personnel for implementation. However, the data used in the pre-drilling analysis has great uncertainty, which often leads to the fact that the boreholes drilled along the design trajectory during the drilling process cannot meet the needs of gas drainage and water exploration. The emergence of the geosteering system effectively solves this problem. Geosteeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/13
Inventor 张冀冠汪凯斌王小龙陈刚连杰田小超蔺兑波任亚平贾明群
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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