摘要
福山油田下第三系流沙港组地层以泥页岩为主,层理、微裂缝发育,易发生泥页岩坍塌及电测遇阻等复杂事故,影响了钻井速度和油气层保护。通过对流沙港组地层矿物组分、理化性能、地应力及地层坍塌压力等分析,对井壁失稳的机理进行研究,研选出了强抑制、强封堵的有机盐钻井液。利用地层压力预测分析的成果,确定了合理的钻井液密度。通过现场应用解决了福山油田流沙港组的井壁失稳问题,缩短了钻井周期,钻井液密度和压力预测结果很好的吻合,平均井径扩大率为2.69%～8.38%,一次电测成功率为100%,钻完井过程中均无井壁坍塌等复杂事故发生。
Caving and touch sticking are encountered while drilling and logging in group of Liushagang in Fushan oilfield,which are caused by shale and micro-fracture.Research on the mechanism of borehole wall instability is developed based on analysis of rock mineral components,physical and chemical performances,crustal stress and formation caving pressure,on which the organic salt drilling fluid with strong inhibition and good sealing capacity is optimized.By means of caving pressure prediction,the drilling fluid density is confirmed,and the application shows that the average wellbore diameter enlargement rate is 2.69%-8.38% and the electric logging jobs are 100% successful.
出处
《钻井液与完井液》
CAS
北大核心
2012年第6期42-44,48,共4页
Drilling Fluid & Completion Fluid
基金
中石油工程技术分公司项目<井壁稳定与钻井事故复杂预防技术研究>(GCJS-2011T7)部分研究内容
关键词
井壁稳定
抑制性
封堵
流沙港组
有机盐钻井液
Borehole stability
Inhibition
Sealing
Group of Liushagang
Organic salt drilling fluid
