Calculation method for measuring distance between adjacent wells by electromagnetic detection while drilling

Abstract

The invention provides a calculation method for measuring the distance between adjacent wells by electromagnetic detection while drilling, mainly comprising the processing of acquired data, measuring method of magnetic short section surrounding space magnetic field model and ground magnetic short section equivalent magnetic moment and oriented algorithm and the like. The invention is characterized in that the magnetic short section is taken as a magnetic dipole to educe the calculation formula of the magnetic short section surrounding space far field magnetic induction strength; a practical method for measuring the magnetic short section equivalent magnetic moment on the earth surface is invented according to the calculation model of the magnetic dipole; an oriented algorithm in which a system for measuring the distance between adjacent wells by electromagnetic detection while drilling is applied to the distance measuring between the communicated horizontal well and the vertical well according to the calculation model of the magnetic dipole; and an accurate calculation results can be obtained by repeated calculation according to the relation between the equivalent magnetic moment of the underground magnetic short section and the equivalent magnetic moment of the earth surface and the relation between the magnetic declination measured by the electromagnetic detection system while drilling and the local magnetic declination. Simultaneously, the algorithm is also applicable to the application of the system for measuring the distance between adjacent wells by electromagnetic detection system drilling in anti-collision of bi-level wells and adjacent wells.

Description

technical field [0001] The invention relates to a calculation method for the distance between adjacent wells for electromagnetic detection while drilling, 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, the drilling trajectories of complex wells such as double horizontal wells, interconnected wells and U-shaped wells are complex, and directional control is difficult. It is required to accurately detect the distance of 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 ...

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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