杏平1水平分支井钻井液技术  

Horizontal Multi-lateral Drilling Fluid Technology: Well Xingping-1

作　　者：蔺志鹏[1] 陈恩让[1] 胡祖彪[1] 高洁[1] 谭海嵘[1] 

机构地区：[1]长庆石油勘探局工程技术研究院

出　　处：《钻井液与完井液》2007年第2期15-18,共4页Drilling Fluid & Completion Fluid

摘　　要：杏平1井为一口多分支（7分支）水平井。为了该井的顺利完成和对低压低渗透油层的保护，研究应用了低摩阻、低伤害无固相钻井液。现场应用证实，该体系有效控制了易塌层直罗组、富县组和煤层、炭质泥岩的井壁坍塌，在主水平井段钻完后静止浸泡达6d的情况下顺利下钻；钻井液性能稳定，API滤失量可控制在2mL以内，3.5MPa、60℃下的滤失量不大于20mL，对水基无固相钻井液滤失量的有效控制进行了一次成功的尝试；钻井液润滑系数为0．065-0．15，摩阻扭矩小，井壁稳定，为长水平井段多分支井的顺利钻进提供了安全保证，水平及分支井段平均机械钻速达到6．84m／h；该钻井液无初失水，滤饼渗透率低，pH值小于8．5，滤液对杏河区块长6油层岩心的伤害率小于20％，渗透率恢复值达到70％。Well Xingping-1 is a horizontal multi-lateral(7 laterals) well.Low drag solids free drilling fluid was used to drill this long horizontal displacement well successfully and to protect the low-pressure low-permeability reservoir from being damaged.Field practice shows that the mud used effectively stabilized the heaving Zhiluo and Fuxian formations and coal beds,carboniferous mudstones.Trip-in was done smoothly in the horizontal section even after 6 days during which mud circulation had been stopped.API filter loss could be maintained at less than 2 mL and filter loss measured at 3.5 MPa and 60 ℃ was not greater than 20 mL.The friction coefficient was less than 0.15,with a minimum of 0.065.Drag and torque were low and bore hole stability was improved using this mud.The average ROP in horizontal and lateral sections were up to 6.84 m/h.This mud had no spurt water loss and the permeability of the mud cake wa low.The pH of the mud was less than 8.5.Low molecular weight cationic polymer and silicon additive in the mud greatly enhanced its performance in the application in horizontal multi-lateral wells.Permeability test on a core from Well Chang-6 showed that the core permeability damage was less than 20%,and the permeability recovery was 70%.

关 键 词：分支水平井 水基钻井液 无固相钻井液 钻井液性能 储集层 地层损害 现场试验 

分 类 号：TE254.3[石油与天然气工程—油气井工程]