钻井液与完井液2017，Vol.34Issue(6)：73-78,6.DOI:10.3969/j.issn.1001-5620.2017.06.014
动态平衡固井技术与实践
Technology of Well Cementing under Dynamically Balanced Pressure and Its Application
摘要
Abstract
Wells in northwest Sichuan are being drilled deeper and deeper.In west Sichuan,exploration activity has extended to the depths of the lower Permian Series and the Cambrian System.In the west of Sichuan cementing of complex ultra-deep wells has to be faced with multi pressure systems along the wellbore,and narrow drilling windows.Using conventional liner cementing techniques,the ultra-deep wells are unable to be cemented effectively.To address the problems in liner cementing,i.e.,the coexistence of blowout and lost circulation in ultra-deep wells,well cementing under dynamically balanced pressure was practiced in wells penetrating pressure sensitive formations,and a set of techniques,including annular pressure control when cementing a well with narrow safe drilling windows and anti-channeling cement slurries.The techniques have first been successfully applied in cementing the φ 114.3 mm liner in the well LG70 under managed pressure,ensuring the job quality of cementing a well with small annular clearance,high temperature and coexistence of blowout and lost circulation.These techniques have also been successfully used on many other wells,providing a whole new technology for the prevention of channeling and lost circulation in cementing wells with narrow safe drilling windows.关键词
固井/动态平衡/漏喷同存/窄密度窗口/防窜水泥浆/实时监测/流变学模型Key words
Dynamically balanced/Coexistence of blowout and lost circulation/Narrow safe drilling window/Anti-channeling cement slurry/Real-time monitoring/Rheological model分类
能源科技引用本文复制引用
鲜明,陈敏,余才焌,刘洋,吴朗..动态平衡固井技术与实践[J].钻井液与完井液,2017,34(6):73-78,6.基金项目
中国石油天然气集团公司工程技术科技项目“川西地区高压气井窄密度窗口固井技术集成应用研究”(2017T-001-005)部分研究成果. （2017T-001-005）
