马深1井二开大井眼优快钻井技术

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

马深1井是中石化部署在川东北通南巴构造带马路背构造高部位上的一口重点预探井,完钻井深8 418 m,二开?444.5 mm/?406.4 mm大井眼钻达4 295 m,为该地区最深大井眼段。该井段以陆相地层为主,地质条件复杂,地层可钻性差,井壁不稳定以及地层软硬交错且倾角较大,且在水力参数和破岩能量等方面存在一系列问题。针对不同地层特征和岩石性质,优选了气体钻井、大扭矩螺杆+PDC、涡轮+孕镶、混合钻头、旋冲工具等多项新技术、新工具,基于动力学防斜打快理论,在保证井身质量的前提下大幅提高了机械钻速。同时,自主研制了KCl聚胺防塌钻井液体系,有效解决了井壁失稳的问题。

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.