摘要
枯竭气藏型地下储气库地层压力系数低,钻完井中储层保护难度大。针对呼图壁储气库水平井大压差钻完井中井筒工作液深度侵入储层造成严重储层损害的难题,通过储层岩石的矿物组分分析和膨胀性、润湿性、自吸钻井液滤液的渗透率损害率测定,分析了呼图壁储气库储层损害的主要方式,即强水敏地层的黏土水化膨胀和致密储层的液锁损害;提出了强化抑制能力、弱化岩石表面液体润湿性、提高暂堵能力的技术对策,优选胺基抑制剂、ABSN等处理剂优化现场钻井液体系,同时基于“最优充填”桥堵理论优化暂堵颗粒粒级分布。室内评价和现场应用表明,优化后的钻井液能够有效抑制黏土膨胀,适用于射孔完井和筛管完井的渗透率恢复率大于90%,对枯竭气藏钻完井提高储层保护效果具有一定借鉴意义。
Formation damage control of Hutubi underground gas storage(UGS) presents a serious challenge due to low formation pressure coefficient and reservoir deep invasion of wellbore working fluid under large pressure difference during drilling and completion.Mineral composition analysis,expansion capacity,wettability and permeability reduction after spontaneous imbibition measurement of reservoir rocks were conducted to reveal formation damage mechanism of Hutubi UGS.That is the clay minerals hydrated swell and dispersion of water-sensitive formation and water-blocking effect of tight sand reservoir.Drilling fluid technical countermeasure of improving inhibition,weakening liquid wettability and enhancing temporary plugging was put forward.Amine inhibitor and surfactant ABSN were selected to optimize the current used drilling fluid.Temporary plugging particle size fraction distribution was determined based on the“optimal filling”bridging plugging theory.Laboratory and field evaluation show that the optimized drilling fluid is suitable for perforation and screen pipe completion with a permeability recovery more than 90% and effective inhibition of clay swell.The results provide reference for improving formation damage control effect of depleted gas reservoir drilling and completion.
作者
党文辉
张弘
叶成
张楠
李亚东
Dang Wenhui;Zhang Hong;Ye Cheng;Zhang Nan;Li Yadong(Petroleum Engineering Research Institute of Xinjiang Oil Field Company,Karamay Xinjiang 834000,China;CNPC Engineering Technology R&D Company Limited,Beijing 102206,China)
出处
《石油化工高等学校学报》
CAS
2022年第1期75-80,共6页
Journal of Petrochemical Universities
基金
中国石油天然气集团有限公司课题(2019B-3204)。
关键词
储气库
储层保护
抑制性
防水锁
暂堵粒径
Underground gas storage
Formation damage control
Inhibition
Water blocking proof
Temporary plugging
