Alternating magnetic field guiding device

Abstract

The invention discloses an alternating magnetic field guiding device. The alternating magnetic field guiding device comprises a near-bit manual magnetic pole module, a destination module and a source control module, wherein the near-bit manual magnetic pole module transmits a low-frequency alternating magnetic field signal; the destination module acquires the low-frequency alternating magnetic field signal and calculates the relative azimuth and distance between a bit and a destination target point; the information of the relative azimuth and distance is transmitted to a driller indication control unit of the source control module by a remote transmission unit; and the driller indication control unit adjusts the drilling direction of the bit in real time according to the received information of the relative azimuth and distance between the bit and the destination target point, so the bit is controlled to accurately drill toward the destination target point. The alternating magnetic field guiding device breaks through the conventional open-loop control mode depending on the measurement result of the near-bit azimuth angle of the source, and improves the accuracy of controlling the bit to drill toward the destination target point in real time by measuring the information of the relative azimuth and distance between the bit and the destination target point and taking the relative azimuth and distance between the bit and the destination target point as the closed-loop control parameters.

Description

technical field [0001] The invention relates to an alternating magnetic field guiding device, which belongs to the technical field of drilling trajectory guiding and positioning. Background technique [0002] In the fields of petroleum, geology and minerals, etc., drilling engineering is a key link in resource development. With the rapid development of modern oil and gas exploration and development, complex structure well trajectory control technology has become the frontier and key of the current international energy industry. Wells with complex structures include horizontal wells, extended-reach wells, multi-lateral wells and re-drilling of original wells and other new oil wells. Using this technology can realize efficient three-dimensional development of oil and gas reservoirs. Because horizontal wells and multi-branch wells increase the contact area between the wellbore and the reservoir, they have good effects in the development of complex reservoirs, reservoirs at the...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low positioning accuracy existing in the application of the existing geometric guidance and positioning technology to the drilling of complex structure wells, and propose an alternating magnetic field guidance device, which connects the drill bit and the target target through the magnetic field information artificially excited near the drill bit. The point coupling is a closed-loop system, and the measurement unit at the target end determines the relative orientation and distance between the drill bit and the target point. This invention breaks through the traditional open-loop mode in which the drill bit end and the target end are independently measured separately, and avoids the accumulation of measurement errors.

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