吐哈油田超低压储气库钻井工程方案优化设计与应用  

Drilling programmes for an underground gas storage with ultra-low pressure,Tuha oilfield:Optimization and application

作　　者：陈芳 刘万成 吴津 陶梦超 CHEN Fang;LIU Wancheng;WU Jin;TAO Mengchao(Engineering and Technology Research Institute,PetroChina Tuha Oilfield Company,Hami,Xinjiang 839009,Chi-na)

机构地区：[1]中国石油吐哈油田公司工程技术研究院,新疆哈密839009

出　　处：《天然气勘探与开发》2024年第3期70-76,共7页Natural Gas Exploration and Development

摘　　要：温西一储气库是吐哈油田首座超低压气藏型储气库,目的层是侏罗系西山窑组,气藏压力系数仅为0.20~0.22,垂直裂缝发育,盖层及以上发育大段泥页岩,极易水化剥落,井漏与井塌并存对优快完钻带来了极大挑战。通过综合评估温西一库超低压气藏地质及钻完井条件并深度吃透储气库设计要求,对储气库注采井钻井工程方案进行了优化设计:①采用三开结构,技术套管下至储层顶1~2 m;②生产套管采用韧性微膨胀水泥浆体系,固井工艺采用尾管悬挂+套管回接;③三开钻井应用聚胺钻井液体系配合凝胶复合承压堵漏技术。形成的温西一库钻井工程方案经现场实践证明,完钻井漏失量较前期降低50%以上,固井合格率均大于70%,盖层段连续优质超40m,满足储气库全生命周期井筒完整性要求,为国内同类型储气库建设提供了技术借鉴。Wenxiyi Underground Gas Storage(UGS)is the first ultra-low pressure one in Tuha oilfield rebuild from depleted gas reservoirs with the Jurassic Xishanyao Formation as the target.Xishanyao gas reservoirs are characterized by the pressure coefficient only from 0.2 to 0.22,well-developed vertical fractures,massive shale which is stretched into or above caprocks very easy to be hydrated and peeled off,leading to coexistence of lost circulation and well collapse.The optimal and fast drilling is confronted with great challenges.So,for the ultra-low pressure reservoirs,their geological,drilling and completion conditions were evaluated to make clear design requirements on this UGS.In addition,three drilling programmes were optimized for injection and production wells.First,a third-spud casing program is adopted,running the intermediate casing about 1 m to 2 m above top reservoirs.Second,following the liner hanging and casing tie-back,the production casing is cemented with ductile micro-expansion cement slurry.Third,the polyamine drilling-fluid system is combined with gel composite pressure plugging in this spud.After the application of these programmes to Wenxiyi UGS,the lost circulation is reduced by above 50% than before,the cementing qualification exceeding 70%,and the quality cementing in continuous caprocks over 40 m,respectively,meeting the demand of wellbore integrity throughout a life cycle of the storage,which may provide technical reference for similar kinds of UGS construction in China.

关 键 词：超低压气藏 储气库 井身结构 韧性水泥浆体系 聚胺钻井液体系 堵漏 

分 类 号：TE972[石油与天然气工程—石油机械设备]