Active alternating magnetic field information-based method for guiding and positioning well drilling track

An alternating magnetic field, guiding and positioning technology, which is applied to drilling equipment, directional drilling, drilling automatic control systems, etc., can solve the problems of insufficient positioning accuracy of guiding technology, and achieve the effect of avoiding the accumulation of errors
CN101929310BActive Publication Date: 2012-11-07BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2012-11-07

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Abstract

The invention discloses an active alternating magnetic field information-based method for guiding and positioning a well drilling track. The method comprises the following steps of: 1, acquiring an in-phase reference component I and an orthogonal reference component Q through a near-bit magnetic field signal; 2, acquiring a characteristic signal HIQ of an elliptical polarizing magnetic field at atarget point; 3, acquiring a relative azimuth between a drill bit and the target point; 4, acquiring a relative distance between the drill bit and the target point; and 5, controlling the drill bit to drill accurately towards the target point through the relative azimuth and the relative distance between the drill bit and the target point. The method has the advantages of breaking through a method for separately measuring a near-bit coordinate and a target point coordinate in the conventional geometric guide technology, directly linking a near bit with the target point through a low-frequencyalternating magnetic field, directly measuring the relative position relation of the drill bit and the target point, avoiding error accumulation in the conventional geometric guide technology and guiding the drill bit to drill from an end of the target point.
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Description

technical field

[0001] The invention relates to a drilling trajectory guidance and positioning method based on active alternating magnetic field information, and belongs to the technical field of high-precision steering drilling. Background technique

[0002] In the petroleum and geological mining industry, drilling and logging engineering is one of the essential key links in mining. Wells with complex structures include horizontal wells, extended-reach wells, multilateral wells, interconnected wells and re-drilling of original wells, etc., which play an important role in the efficient three-dimensional development of oil and gas deposits.

[0003] Geometric steering drilling is a very important part of modern steering drilling technology, and it is still the main method used in well logging and drilling. Geometric steering means that when the drilling geological conditions of mature oilfields are completely clear and there is almost no geological uncertainty, the steering ...

Claims

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