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文章全面系统的分析、总结，提出了一整套避免侧钻失败的工艺技术措施，即提高四川油气田侧钻成功率的技术途径，主要内容包括：根据井径曲线，原井眼井斜情况、地层岩性、井下地层流体压力情况等因数优选侧钻点和设计侧钻井眼轨迹，根据不同地质条件优选弯接头、钻头和侧钻方法，合理地设计水泥塞长度和保证水泥塞强度，正确定向，合理控制钻时，优选侧钻参数，保持良好的钻井液性能，合理使用钻头，准确判断钻头使用寿命及侧钻后控制井眼轨迹使新旧井眼保持适当距离等技术措施，以确保侧钻成功。在工艺和装备上，继续加强套管井侧钻科研攻关，配套完善套管井侧钻工艺技术

Technical way to Realizing Efficient Sidetracking in Sichuan Oil and Gas Field

According to the geological characteristics of the fractured carbonate oil and gas reservoirs in Sichuan oil and gas field and the successful experiences and failing lessonin sidetracking operation in recent years,a comprehensive and systematic analysis and summary have been made,and a complete set of the technological measures which can avert sidetracking failure,i.e.the technical way to raise the sidetracking success ratio in Sichuan oil and gas field,have been put forward.The main contents include:on the basis of some factors,such as caliper log curves,original hole deviation,the lithology of formation and the pressure of downhole formation fluid,etc.,to optimize sidetracking point and to design sidetracking well track;according to different geological conditions,to optimize bent sub,bit and sidetracking method;rationally designing the length of cement plug and pledging the strength of cement plug;correctly orienting;rationally controlling drilling time;optimizing drilling parameters;keeping a good property of drilling fluid;rationally using bit and accurately judging the service life of bit;controlling well track after sidetracking (keeping a suitable distance between new and old holes),etc..Meanwhile,in the aspects of technology and equipment,the scientific research on sidetracking in cased hole should be continuously strengthened and the technology for sidetracking in cased hole should be matched and perfected,providing a new technical way for oil and gas exploration.