The"mud no-landing"drilling has been used across Sulige area as the implementation of new law on environmental protec-tion.Slim-hole drilling is effective to reduce mud volume,waste,and cost of downhole steel and cementing.However,there existed some problems in this sort of drilling in Sulige gasfield,such as poor drillability of rock,difficultly selecting kick-off points,complex horizontal trajectory,and downhole accidents due to geologic complexity.So,numerous researches were conducted from aspects of optimizing the casing program,slim-hole trajectory,bit,hydraulic parameters,drilling fluids and performance parameters.It is con-cluded that(i)the optimized program is more economical and reasonable after strengthening supporting measures on safe drilling;(ii)the low-solid fluids boast strong temperature stability and better inhibition of core dispersion,which can avoid adhesive sticking with effect to achieve preferable plugging at low cost;and(iii)the selected PDC bits correspondence to various lithological feature and the optimal hydraulic parameters can increase the rate of penetration(ROP)and maintain the drilling rate above 95%in sandbody.
关键词
小井眼/钻头优选/轨迹优化与控制/钻井液性能参数/水力参数
Key words
Slim-hole/Bit optimization/Trajectory optimization and control/Drilling-fluid parameter/Hydraulic parameter
维普
万方数据