俄罗斯萨哈林-3号V区块优快钻井技术

Optimized and Fast Drilling Techniques in Sakhalin-3 V-Block of Russia

在分析研究俄罗斯萨哈林-3号V区块钻井资料的基础上,结合设计井位的地质地震资料,提出了钻井技术优化方案,包括优化井身结构、在领眼无浅层气情况下加工简易喇叭口替代导流器、选用辐向螺栓型井口头、311.1和215.9 mm井段使用螺杆钻具配合优选的PDC钻头、测试阶段用钻杆下入EZSV桥塞封隔射孔段、339.7和244.5 mm套管串中使用PDC钻头可钻的套管附件及非旋转固井胶塞、调整钻井液性能、基地预先配置KCl基浆等钻井技术措施,并加强生产组织管理及全方位生产协调。该优快钻井技术在2009年度部署的2口探井中的应用结果表明,平均机械钻速均成倍提高,钻井周期大大缩短,明显降低了钻井成本。

Based on the analysis of the historical drilling data,a fast and optimized drilling technique was provided combined with the seismic geological data of Sakhalin-3 V-Block.This technique was applied in two exploration wells in 2009.By using a series of techniques,the average ROP of these two wells increased greatly,the drilling cycle was shortened and the drilling cost was reduced.These techniques includes optimization of casing program,using simple bell nipple instead of diverter for pilot hole without shallow gas,selection of radial bolts wellhead,using positive downhole motor（PDM） with PDC bit during 311.1 and 215.9 mm well section,using EZSV plugs to isolate perforations during testing stage,using PDC drillable casing accessories with non-rotational cementing plugs in 339.7 and 244.5 mm casing string,adjusting drilling fluid rheology property,and preparing KCl based fluid at service station,etc.