Well G68-16 is the ifrst test well for Ø206.4 mm slim hole in the south of Jingbian gas ifeld block. In line with complex formation characteristics in this block and combining drilling characteristics of G68-16 slim hole, optimizing bottom hole assembly (BHA), drill bit and screw model, technical measures like optimizing the parameters, drilling lfuid maintenance and prevention of down-hole troubles were applied, The well was successfully drilled with four runs during the second section and four runs for reaming;reaming down took 16 days due to handling downhole trouble in later drilling stage;the average penetration rate was increased by 19%compared with the original Ø215.9 mm hole. The test is very successful, has accumulated experience for further slim hole test drilling in this block and provides favorable technical reference for increasing drilling rate.%G68-16井是靖南气田区块第1口Ø206.4 mm小井眼试验井。针对该区块地层复杂地质特征，结合G68-16井小井眼钻井特点，优化钻具组合、优选钻头和螺杆型号，通过参数优化、钻井液性能维护以及预防井下复杂和事故等技术对策，使该井二开钻进4趟钻、划眼4趟钻完钻，钻井后期因处理井下复杂划眼历时16 d，完井作业顺利，平均机械钻速比原Ø215.9 mm井眼提高了19%。试验取得较好的效果，为该区块进一步进行小井眼钻井试验积累了经验，为提速提供了有利的技术参考。
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