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Hand push type device and method for time domain electromagnetic logging in coal mine underground borehole

A time-domain electromagnetic, hand-push technology, applied in the field of geophysical exploration, can solve the problems of no logging method and inapplicability, and achieve the effect of improving stratigraphic division

Inactive Publication Date: 2018-09-28
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of coal fields, it is also necessary to use logging technology to divide boreholes into strata, identify lithology, and judge the occurrence of rock formations. However, a single logging method cannot achieve these goals well, and multiple methods are required. analysis only
However, in coal mines, due to the limitation of intrinsically safe explosion-proof conditions and the limitation of drilling aperture, there is no other practical logging method except natural gamma ray logging.
In addition, there are many horizontal drilling holes underground in coal mines, and the method of using gravity to transport logging devices on the ground is not applicable

Method used

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  • Hand push type device and method for time domain electromagnetic logging in coal mine underground borehole
  • Hand push type device and method for time domain electromagnetic logging in coal mine underground borehole
  • Hand push type device and method for time domain electromagnetic logging in coal mine underground borehole

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Embodiment

[0037] A hand-push time-domain electromagnetic logging method in coal mine underground drilling, comprising:

[0038] 1) Wind a multi-turn coil pointing to the vertical direction on the coil skeleton outside the magnetic rod, and make a receiving probe in the hole;

[0039] 2) Wind a multi-turn transmitting coil in the same direction behind the receiving probe, the diameter of the coil is the same as that of the receiving coil, and there should be no gap between them;

[0040] 3) The transmitting coil and the receiving probe are packaged together in a non-metallic cylinder to form a device in the hole, and the front part of the device is made into a vertebral body;

[0041] 4) The launch connection line and signal receiving amplifier circuit are arranged inside the rear of the equipment in the hole, and are connected to the host outside the hole through aviation plugs and multi-core cables;

[0042] 5) The host outside the hole can set and detect parameters such as the freque...

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Abstract

The invention belongs to the technical field of geophysical prospecting and relates to an electromagnetic logging device and method, in particular to a hand push type device and method for time domainelectromagnetic logging in a coal mine underground borehole. In-hole transmitting and receiving devices with identical-diameter transmitting coils are wound on the rear portion of a probe, a multi-joint carbon fiber rod is used for pushing the device into the coal mine underground borehole, time domain rectangular wave current in a duty ratio of 50% is supplied into the transmitting coils to realize measurement of borehole radial rock electrical property variation. By adoption of the method, one-dimensional electrical property variation curves of rocks can be obtained while borehole radial two-dimensional apparent restivity distribution can be obtained through a data processing technique, and stratigraphic division and lithologic identification accuracy of the borehole can be remarkably improved by natural gamma-ray logging.

Description

technical field [0001] The invention relates to an electromagnetic well logging device and method, belonging to the technical field of geophysical exploration, in particular to a hand-push time-domain electromagnetic well logging device and method for drilling underground coal mines. Background technique [0002] In the process of oilfield exploration and development, well logging is one of the effective ways to determine and evaluate oil and gas layers, and is an important means to solve a series of geological problems. In the field of coal fields, it is also necessary to use logging technology to divide boreholes into strata, identify lithology, and judge the occurrence of rock formations. However, a single logging method cannot achieve these goals well, and multiple methods are required. analysis only. However, in underground coal mines, due to the limitation of intrinsically safe explosion-proof conditions and the limitation of drilling aperture, there is no other pract...

Claims

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Application Information

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IPC IPC(8): G01V3/28
Inventor 范涛王继矿燕斌赵兆李博凡赵睿刘磊
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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