钻井液与完井液2017，Vol.34Issue(6)：13-17,5.DOI:10.3969/j.issn.1001-5620.2017.06.003
化学凝胶堵剂承压堵漏技术在顺北3井的应用
Application of Chemical Gel LCM on Well Shunbei-3
摘要
Abstract
Well Shunbei-3 is an exploration well located on the north rim of the Shuntuoguole low uplift in Tarim Basin,Xinjiang.This well penetrated the Permian system igneous rocks which have developed fractures,poor cementation,easy-to-break zones and low pressure bearing capacity.Six times of lost circulation during drilling were dealt with bridging agent lost circulation material (LCM)and cement slurry,and the results were unsatisfactory because of low success rate of the first try in lost circulation control.To resolve the lost circulation problem taking place in the low pressure bearing capacity formation of the Permian system,a chemical gel LCM,HND-1,was developed with several nanophase LCMs.Analyses of the mechanisms of HMD-1 indicated that HND-1 had the ability of controlling lost circulation through "synergism" of multiple LCMs,and it can substantially enhance the pressure bearing capacity of formation.Laboratory evaluation demonstrated that chemical gel LCM slurry formulated with HND-1 had thickening time adjustable between 4 h and 20 h,and the compressive strength of the LCM slurry after 24 h was 12 MPa or higher.The HND-1 LCM slurry had density adjustable between 0.8 g/cm3 and 2.25 g/cm3,and was compatible with other drilling fluid additives.The HND-1 LCM slurry was tried in the controlling of lost circulation occurred in the Permian system penetrated by the well Shunbei-3,and good results were obtained.The thief zones were pressurized at 5 MPa,with pressure drop of only 0.2 MPa in 30 min.The equivalent density of the Permian system reached 1.55 g/cm3,satisfying the density requirement for drilling in the Permian system.关键词
井漏/承压堵漏/化学凝胶堵剂/顺北3井Key words
Lost circulation/Lost circulation control under pressure/Chemical gel lost circulation material/Nanophase lost circulation material/Compatibility分类
能源科技引用本文复制引用
方俊伟,吕忠楷,何仲,李圆,于培志..化学凝胶堵剂承压堵漏技术在顺北3井的应用[J].钻井液与完井液,2017,34(6):13-17,5.基金项目
中国石油化工股份有限公司西北油田分公司局级项目“顺北区块井壁强化与储层保护技术”(34400007-16-ZC0607-0077). （34400007-16-ZC0607-0077）
