压力衰竭型气藏大位移水平井储层钻开液体系优化  

Drilling Fluid System Optimization of Extended Reach Horizontal Well in Pressure Depletion Gas Reservoir

作　　者：申永强 张明[1] 张立权[1] 易鹏昌 李强[1] 刘日淦 Shen Yongqiang;Zhang Ming;Zhang Liquan;Yi Pengchang;Li Qiang;Liu Rigan(Zhanjiang Operation Company,Oilfi eld Chemicals Division,COSL,Guangdong,524000)

机构地区：[1]中海油田服务股份有限公司油田化学事业部湛江作业公司,广东524000

出　　处：《当代化工研究》2023年第23期99-101,共3页Modern Chemical Research

摘　　要：国内L气田经过长期开发,储层压力系数衰竭严重,且地层破裂压力低,密度窗口窄,储层钻开液的封堵性能不足导致井壁失稳及井漏频发,采用大位移水平井的开发模式,对钻井液的井眼清洁能力及润滑性提出了更高的挑战。针对现场存在的问题,储层井段对前期使用EZFLOW钻开液进行优化,依据DRILL BENCH携岩模拟软件确定了钻井液的流变参数,按照D_(90)规则优选了暂堵剂显著提高了钻开液的高承压封堵性能,优化润滑剂加量显著降低扭矩摩阻,优化后的钻开液体系具有良好的返排性能,渗透率恢复值在90%以上,为国内衰竭型大位移水平井开发提供借鉴。After long-term development,reservoir pressure coefficient of L field is severe failure,and it has the characteristic with low formation fracture pressure and narrow density window.The lack of plugging performance of drill-in fluid results in borehole wall instability and well loss frequently.The L gas field adopts the development mode of extended reach horizontal well,which poses a higher challenge to the borehole cleaning ability and lubricity of drill-in fluid.This paper focus on the problems and optimizes EZFLOW drill-in fluid,the rheological parameters were determined by the DRILL BENCH rock carrying simulation software;The temporary plugging agent was optimized according to the D_(90) rule to significantly improve the plugging performance of the drilling fluid under high pressure.The optimized drilling fluid system has good flowback performance and permeability recovery value,which is more than 90%.The optimized EZFLOW drill-in fluid system provides a reference for the development of other depleted extended reach horizontal wells in China.

关 键 词：压力衰竭 大位移水平井 储层保护 返排性能 

分 类 号：TE[石油与天然气工程]