Electromagnetic surveying system while drilling of adjacent-well parallel intervals

An electromagnetic detection and spacing technology, applied in electromagnetic wave detection, electric/magnetic detection for well logging records, etc., can solve the problems of not being able to directly measure the distance of adjacent wells, difficult to meet complex structure wells, and keeping the core technology confidential. Achieve the effect of saving data sending time, simple structure, and high-precision guiding effect

Active Publication Date: 2010-08-11
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

At present, the measurement-while-drilling tools commonly used in China cannot directly measure the distance between adjacent wells, so it is difficult to meet the special requirements of detection-while-drilling for the distance between adjacent wells in wells with complex structures
In addition, although foreign countries have developed an electromagnetic guidance system while drilling that can basically meet the above requirements, its core technology is still kept secret and monopolized.

Method used

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  • Electromagnetic surveying system while drilling of adjacent-well parallel intervals
  • Electromagnetic surveying system while drilling of adjacent-well parallel intervals
  • Electromagnetic surveying system while drilling of adjacent-well parallel intervals

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Embodiment Construction

[0035] The present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0036] Such as figure 1As shown, the hardware of the electromagnetic detection system while drilling with parallel spacing in adjacent wells is mainly composed of magnetic nipples, downhole dual magnetic sensor probes, and ground equipment. The magnetic sub and the drill bit are installed together, and the drill bit is lowered into the well being drilled. The magnetic sub is not only a part of the drill pipe, but also the signal source of the parallel spacing while drilling electromagnetic detection system in adjacent wells. During operation, the magnetic sub is usually installed on the closest drill collar to the drill bit. During the drilling process, the magnetic short The position of the joint can be approximately considered as the position of the drill bit. The downhole dual magnetic sensor probe is lowered into the pre-drilled horizontal well through th...

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Abstract

The invention discloses an electromagnetic surveying system while drilling of adjacent-well parallel intervals, which is capable of providing accurate guiding measurement and calculation for well path control of wells with complicated structures such as double-horizontal wells, directional wells, interspaced wells and the like. The system mainly comprises a magnetic short section, an underground double-magnetic sensor survey meter, a computing system for the adjacent-well parallel intervals, a ground display system and the like. In the invention, the underground double-magnetic sensor survey meter comprises two high-precision alternating magnetic field sensors, can detect two groups of rotating magnetic field signals, and can accurately detect the adjacent-well parallel intervals by a certain drilling footage without a drill bit, thereby being capable of fishing surveying within shorter time; and a data analysis and calculation procedure can be put in the well, and sends few calculated data to the ground, thereby saving the data transmission time. The invention has convenient use, provides an efficient innovative and high technology for the surveying while drilling and the control of the adjacent-well parallel intervals.

Description

technical field [0001] The invention relates to an electromagnetic detection system while drilling with parallel spacing between adjacent wells, and belongs to the technical field of underground resource drilling and production engineering. Background technique [0002] In the exploitation of oil, natural gas and coalbed methane, complex structure wells such as double horizontal wells, directional wells and infill wells require accurate detection of the distance between adjacent wells while drilling. At present, the measurement-while-drilling tools commonly used in China cannot directly measure the distance between adjacent wells, so it is difficult to meet the special requirements of detection-while-drilling for the distance between adjacent wells in wells with complex structures. In addition, although foreign countries have developed an electromagnetic guidance system while drilling that can basically meet the above requirements, its core technology is still kept secret an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/30
Inventor 高德利刁斌斌吴志永
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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