摘要
焦页18-10HF井是中石化在涪陵页岩气田部署的一口开发井,完钻井深4560 m,水平段长度1378 m。该工区三开井段页岩脆性矿物含量高,微纳米级孔隙裂缝和层理发育,一直使用油基钻井液应对井下复杂情况。针对龙马溪五峰组页岩裂缝发育等特性,通过核心处理剂端胺基聚醚抑制页岩表面水化,植物油酰胺极压减摩剂有效润滑减阻,纳米封堵封固,构建了JHGWY-1高性能水基钻井液,页岩滚动回收率大于98%,极压润滑系数0.16,钻井液封堵泥饼承压超过10 MPa,满足龙马溪五峰组页岩微裂缝发育、脆弱胶结面对封堵封固及水平段润滑减阻要求。该体系首次在涪陵工区的焦页18-10HF井三开井段代替油基钻井液,在设计垂厚10 m、实钻8~10 m的五峰组中顺利穿行,起下钻畅通,钻完井顺利。该体系表现出良好的流变性、低滤失量和稳定页岩井壁能力,完井作业顺利,满足了该井三开钻完井工程需要。
The well Jiaoye18-10HF is a development well drilled in Fuling Shale Gas Field(Sinopec),with completion depth of 4560 m and horizontal length of 1378 m.The shales encountered in the third section of the wells in this area have high content of brittle minerals.Micro-fractures of micrometer and nanometer in size and bedding planes are so rich in the formations that oil base drilling fluids had to be used to minimize downhole troubles.Based on the study on the nature of the fractured shales encountered in the Wufeng Formation in Longmaxi block,a high performance water base drilling fluid,JHGWY-1,has recently been formulated with several major additives;PEA(amine-terminated polyether)as the core additive to inhibit the surface hydration of shales,vegetable oil oleamide as an extreme pressure lubricant to effectively reduce friction and nanometer plugging agent to strengthen borehole walls.In laboratory experiment,JHGWY-1 showed percent recovery of shale cuttings of more than 98%,coefficient of friction of 0.16 and pressure bearing capacity of the mud cake formed of more than 10 MPa.These properties satisfied the needs of drilling operation in Longmaxi area,such as drilling the micro-fracture-enriched Wufeng Formation,plugging and strengthening of formation with weak cementation,and good lubricity of the drilling fluid in horizontal drilling.This drilling fluid was first used in place of oil base drilling fluids in drilling the third interval of the well Jiaoye18-10HF which penetrated through the Wufeng Formation with designed vertical thickness of 10 m(actually 8-10 m during drilling).Tripping of drill string was smooth and the well was successfully completed.The mud had good rheology,low filtration rate and strong inhibition to shale during drilling,and the needs of drilling the third interval of the well was satisfied.
作者
赵素娟
游云武
刘浩冰
周超群
陈长元
罗志刚
ZHAO Sujuan;YOU Yunwu;LIU Haobing;ZHOU Chaoqun;CHEN Changyuan;LUO Zhigang(The First Drilling Branch of Sinopec Jianghan Oilfield Service Corporation,Qiangjiang,Hubei 433121)
出处
《钻井液与完井液》
CAS
北大核心
2019年第5期564-569,共6页
Drilling Fluid & Completion Fluid
基金
国家科技重大专项“涪陵页岩气钻井技术示范”(2016ZX05060-003)
关键词
页岩气
水平井
高性能水基钻井液
涪陵工区
Fuling shale gas
Horizontal shale gas well
High performance water base drilling fluid
作者简介
第一作者简介:赵素娟,工程师,1984年生,硕士研究生毕业于长江大学应用化学专业,现主要从事钻井液技术研究工作。电话18672688936,E-mail:nut8936@dingtalk.com。
