双凝抗盐防气窜水泥浆在超深气井LY1井的应用  

Application of Dual-thickening Anti-channeling Cement Slurry System in Ultra-deep Gas Well LY1

作　　者：焦少卿[1,2] 周回生[2] 全家正[2] 李早元[1] 郭小阳[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室.西南石油大学 [2]西南油气分公司工程监督中心

出　　处：《钻井液与完井液》2013年第5期67-70,100,共4页Drilling Fluid & Completion Fluid

基　　金：十二五国家重大专项课题4"复杂地质条件下深井钻井液与高温高压固井技术研究"(2011ZX05021-004)资助

摘　　要：LY1井是位于四川盆地东北的一口超深预探井,裂缝和溶洞异常发育,存在多个压力系统和含气层,二开采用φ273.1 mm套管回接固井,且井深5 289 m处有一盐水层,Cl-含量高达45 000 mg/L,固井作业需克服水泥浆窜槽、气窜、抗盐污染等难点,对水泥浆体系的抗盐防气窜性能要求高,为此,研究了过平衡压力双凝抗盐防气窜水泥浆体系。优选了抗盐、防气窜处理剂,且通过设计钻井液、隔离液、水泥领浆的密度梯级匹配来提高顶替效率,减少水泥浆窜槽机会,设计与水泥浆和钻井液混合液相容性强的化学冲洗液对混合液稀释分散。通过实验室评价及在LY1井的现场应用可知,该体系在Cl-含量高达91 025 mg/L的条件下抗盐性能良好,水泥浆性能指数SPN小于3,具有良好的防气窜能力,且固井作业顺利,声幅测井固井优质率达75.23%,合格率达100%,为该地区超深井的复杂固井作业提供了宝贵经验。The well LY1 is an ultra-deep exploration well of Sichuan Basin that has developed fractures and cavernous,multiple formation pressure systems and gas formation.In the second interval of this well,φ73.1 mm casing is used with tie-back,and there is salt water formation in the depth of 5,289 m with Cl-content of 45,000 mg/L.The overbalanced pressure dual-thickening anti-channeling cement slurry system is developed that is based on optimization of salt-resistance and anti-channeling agents, reasonable design of densities of drilling fluid spacer fluid and leading slurry,and flush fluid having good compatibility with drilling fluid and cement slurry.The application of the cement slurry system in well LY1 shows that the SPN value is less than 3 even with the concentration of Cl^- 91,025 mg/L,and the qualified cementing job ratio is 100%and the high quality ratio is 75.23%.

关 键 词：固井 水泥浆 双凝 抗盐 防气窜 超深井 

分 类 号：TE256.6[石油与天然气工程—油气井工程]