关键词: 直井防斜 ,  井身结构优化 ,  水力参数优化 ,  , 钻头优选 ,  现场应用

Abstract: Aiming at Yitong region complex geological conditions, borehole deviation control was difficult, the bit application effect was not good, we carried out the research and application in vertical wells oblique, well bore structure optimization, and bit type optimization. Directional well used "straightincreasestabilitydrop" track type to composite drilling, hole deviation exceeds bid section, vertical drilling system or compound drilling technique was used to achieve the goal of control hole deviation and speed up|the original two open interval optimization from Φ228.6 mm to 241.0 mm hole, solved the problem of the upper reducing open hole section|Select custom bit series was suitable for Yitong and regional characteristics, implemented the new breakthroughs of the PDC bit drilling footage and the improvement of the rate of penetration was again in Yitong region.

Key words: Deviation control on vertical wells, Well bore structure optimization, Hydraulic parameters optimization, Bit optimization, Field application