易斜地层钻孔倾斜规律研究

随着资源勘探开发的进一步深入,钻井工程中井斜给工程带来了一系列危害,井斜规律和防斜降斜技术的研究也越来越引起人们的重视。本文全面分析了影响易斜地层钻孔倾斜的地层因素,主要包括地层倾角、各向异性地层、岩性交替变化地层、断层,并结合湖北某米黄玉矿的勘探实例,分析和验证了易斜地层钻进中客观存在的"车轮效应",即钻头在不均质匀层状地层中钻进时,由于钻头两侧岩石的岩性和抗压强度不同,导致钻头沿地层走向方向偏移,使得钻井轨迹的方位角产生变化。该研究对类似条件的钻井勘察有一定的借鉴意义。

Research on the Well Lean Law of Easy-inclined Strata

Further in-depth exploration and development of resources have led to the drilling inclination which brings a series of hazards for drilling engineering,so well lean analysis and anti-inclination research have become increasingly noticeable.This paper comprehensively analyzes the impact factors of drill inclination,including strata,drilling tools and technology,and takes a jade mine’s exploration in Hubei as an example to analyze and verify the "wheel effect" phenomenon: when the drill bit is working in the inhomogeneous layered strata,due to the difference of lithology and the compressive strength between two sides of the bit,the bit moves along the direction of the strata,making the drilling trajectory azimuth changed.This conclusion may provide some reference for similar conditions.