Electromagnetic system for detecting distance between adjacent wells while drilling

Abstract

The invention provides an electromagnetic system for detecting a distance between adjacent wells while drilling, which is capable of providing accurate guide measurement and calculation for the control of well tracks of wells with complex structures, such as a cross well, a U-shaped communicated well, a dual-horizontal well, an accident rescue well and the like. The electromagnetic system for detecting the distance between adjacent wells while drilling mainly comprises a magnetic pipe nipple, an electromagnetic measuring instrument and a method for calculating the distance between adjacent wells, wherein the magnetic pipe nipple is a hollow cylinder with API standard ports at the two ends consisting of a non-magnetic drill collar and a plurality of permanent magnets, and is used as a signal source for an electromagnetic guide system; the measuring instrument mainly comprises an underground searching tube and a ground system, and is mainly used for detecting a magnetic vector signal ofthe magnetic pipe nipple and for sending data to a computer through an RS-232 interface; and the computer processes and analyzes measured information by using the method for calculating the distance between adjacent wells so as to convert the measured information of a drill position into readable data for engineers. The electromagnetic system for detecting the distance between adjacent wells while drilling has a simple structure and convenient use, and provides an effective high and new technological measure for the detection and control of the distance between adjacent wells with complex structures.

Description

technical field [0001] The invention relates to an electromagnetic detection system while drilling the distance between adjacent wells, belonging to the technical field of underground resource drilling and production engineering. The invention is mainly composed of a magnetic sub, an electromagnetic measuring instrument and an adjacent well distance measurement and calculation method. Background technique [0002] In the exploitation of oil, natural gas and coalbed methane, the drilling trajectories of complex structure wells such as double horizontal wells, connecting wells and U-shaped wells are complex, and the directional control is difficult, requiring accurate detection of the distance between adjacent wells while drilling. At present, the commonly used measurement-while-drilling tools in China cannot directly measure the distance of adjacent wells, so it is difficult to meet the special requirements of detection while drilling the distance of adjacent wells in complex...

AI Technical Summary

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.

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