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While-drilling electric method

An electrical method and while-drilling technology, applied in the field of electrical exploration, can solve problems such as limiting the ability of well-ground electrical detection

Inactive Publication Date: 2010-08-04
TIANJIN YINGCHI EXPLORATION TECH +1
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Problems solved by technology

However, the casing is fixed, and it is not easy to change the excitation method, which also limits the detection capability of the well-ground electrical method

Method used

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  • While-drilling electric method

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specific Embodiment

[0043] Observation system design and layout: For vertical wells, the observation system is arranged radially based on the main center of the well point. The angle between two adjacent radial lines and the number and distance of the measuring points MN on each radial line depend on the measurement instruments that can measure and measure at the same time. Number of points, sensitivity, and measurement requirements. Taking the CDMA electrical instrument produced by Tianjin Yingchi Photoelectric Technology Co., Ltd. as an example, the instrument can measure (39×2) 78 measuring points at the same time. A well that has been implemented on site adopts an included angle of 60°. The distance between the measuring point M on each line and the center is 50 meters. There are 5 measuring points on each line, and the distance between the measuring points is 50 meters. Potential data between 50 and 100 meters, 50 and 150 meters, 150 and 200 meters, 150 and 250 meters. There are 6 measureme...

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Abstract

The invention discloses a while-drilling electric method, which involves a power supply electrode A, a power supply electrode B, and a ground surface detection system, wherein the power supply electrode A is an electrode, of which the depth gradually changes from the ground surface to the underground or from the underground to the ground surface and which supplies power at a preset time interval, and is a constantly drilling drill stem of a drill or a drill stem, of which the depth constantly varies in hoisting and drilling processes of the drill, of the drill; the power supply electrode B is an electrode fixed underground and is an electrode inserted underground or a sleeve pipe placed in an in-completion well or a cable arranged in the well in which the sleeve pipe is not placed; and the ground surface detection system is arranged on the ground surface, and when an observation target well is a straight well, adopts a radial arrangement structure using the observation target well as a center, and the included angle between each two radioactive lines and the number and distance between the measurement points in each radioactive line are determined according to the requirements of observation precision and the sensitivity of the instruments. The method can improve the intensity of the current supplied to a target layer and also improve the accuracy and resolution of the detection of the target layer.

Description

technical field [0001] The invention relates to an electrical prospecting technology. In particular, it relates to an electrical method while drilling that can accurately measure the structure of geological bodies at different depths. Background technique [0002] In resource exploration, it is very important to obtain the electrical characteristics and structure information of the underground in the exploration area. The size, spatial position and storage state of the detection target can be determined through the electrical structure information, and what the detection target is or what minerals it contains can be determined through the electrical characteristic information. Therefore, how to obtain accurate electrical characteristics and structural information of the underground in the exploration area is a problem that the industry pays great attention to, and it is also a problem that needs to be solved urgently. The electrical method is a commonly used technology for...

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Application Information

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IPC IPC(8): G01V3/00G01V3/18
Inventor 蒋福修罗先中戴世坤
Owner TIANJIN YINGCHI EXPLORATION TECH
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