Difficulties and Countermeasures of Optimizing Rapid Drilling Technology in Weiyuan 311.1 mm Wellbore
The pressure system in the 311.1 mm wellbore of sichuan shale gas is complex,the formations are varied and unstable,and some formations have poor drillability,and there are some problems in the drilling process,such as serious sliding uplift pressure,slow rate of penetration,lost circulation,gas invasion,frequent stuck drilling accidents,etc.,it seriously affects the whole exploration and development.Based on the geological features and engineering difficulties such as leakage and sticking,the ROP can be increased from the aspects of downhole equipment,well trajectory,drilling fluid performance adjustment and drilling parameters.But at present,the ground parameters are only an objective statement of the mechanical penetration rate slowing down,and the actual parameters obtained at the bit are not known.The drilling pressure,rotary speed and torque parameters are integrated into a comprehensive parameter by combining the performance of ROP and hydraulic parameters,so as to avoid the risk of downhole operation,and at the same time,the downhole working state is truly evaluated,the real-time optimization system of multi-drilling parameters is established to form the intelligent drilling service ability,thus realizing the optimal and fast drilling technology.
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