Big hole of second section of Well Mashen-1 optimized drilling technology

Well Mashen-1 is a keyvertical exploration well which located at high part of Malubei structure of Tongnanba structure belt and was deployed by SINOPEC. The main part of this well is continental formation.This area is with complex geological conditions, poor drillability, the problem of bore-hole stability, formation alternating hard and soft,and dip angle is bigger. And in the hydraulic parameters and break-rock energy, as well as a series of problems. Through in-depth study and analysis. According to different strata characteristics and rock properties, the application of gas drilling, high torque screw + PDC, turbine + impregnated diamond bit, hybrid bit and rotary percussion tool such as new drilling technology and new tools are optimized. Based on the theory of dynamic anti oblique and fast drilling.Ensure wellbore quality and effectively improve mechanical drilling speed. At the same time, adopted the self-developed KCl polyamine an-ti-cavingcapacities drilling fluid system. This technique successfully cope with the wellbore instability.