川东北优快钻井技术

The optimum drilling technique in the northeast area of Sichuan

川东北地区存在陆相地层可钻性差、高陡构造井斜严重,地层岩性变化大、压力系统复杂、易塌、易漏,"高压、高产、高含硫"勘探风险大等世界级钻井技术难题,造成的钻井复杂情况多、机械钻速慢、钻井周期长。围绕"钻井提速"这一主线,以开发与应用新工艺、新工具提高南方复杂深井钻井速度为目的,从气体钻井和垂直钻井设备引进配套和研发入手,结合已有的欠平衡钻井技术、控压降密度钻井与复合钻井技术,综合应用多种钻井技术全面提高川东北复杂深井钻井速度及井身质量,通过室内实验研究、单项技术试验和综合技术集成,形成了适应川东北地区地层特点的复杂深井优快钻井新技术体系,钻井速度大幅提高,钻井周期大幅缩短,推广应用取得了显著技术经济效益。

Geological conditions in northeast area of Sichuan are complicated,such as poor drillability in terrestrial formation,severe deviation in high angle structural belt.Pressure system and strata lithology in this area is also complicated,which causes many complex cases and accidents like lost circulation and collapse when drilling.Besides these,this area have ＂high pressure,high production,high sourness＂ features.ROP was slow and drilling cycle was long.In order to increase ROP of complicated deepwell in south China,through introducing and developing new technology and new tools,like gas drilling and vertical drilling equipments,combined with existing techniques such as underbalanced drilling,compound drilling,optimum drilling technique system fit for complicated deepwell in northeast area of Sichuan was formed,which improved ROP and wellbore quality of complicated deepwell in south China.