Slim-hole drilling and completion technologies and their application to Su 75 block
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.
Slim-holeBit optimizationTrajectory optimization and controlDrilling-fluid parameterHydraulic parameter
万方数据
维普
