Application of trajectory correction technology in small-diameter screw drilling at Yongwen Daping Mining Area， Guizhou

Abstract:

This study systematically investigated the application of deviation correction technologies to address borehole trajectory deviations encountered during drilling operations in the Yongwen Dapeng phosphate mining area. By optimizing the wellbore trajectory control plan and implementing a phased dynamic regulation strategy （“first reducing inclination， then stabilizing azimuth” e.g.）， combined with a ?73 mm bent screw drilling tool and a JTL-40GX fiber-optic gyroscopic inclinometer for directional measurement， precise coordinated control of the well deviation angle and azimuth angle was achieved. The results demonstrate that the final deviations of the SJK04， SJK05， and SJK06 boreholes were 9.79， 5.91， and 11m， respectively， corresponding to 67%， 36%， and 64% of the permitted design values， which meets the engineering accuracy requirements （deviation limit ≤1%）. Notably， directional drilling in the SJK05 borehole reduced the well deviation angle from 4.93° to 1.68° （a reduction of 65.9%） and adjusted the azimuth angle by 161°. This research provides a technical reference for trajectory control in complex stratigraphic drilling and demonstrates the engineering applicability of the phased regulation strategy.