密闭保形取心技术在埕7-检9井中的应用

Application of Closed Coring Technology in Well Cheng 7-Jian 9

通过工具优选、参数优化、合理选择钻井液与密闭液体系及采取相应的技术措施,在埕7-检9井中密闭取心进尺61.8m,收获岩芯长58.8m,收获率95.15%,密闭率89%,该井密闭取心作业取得成功,表明该套密闭保形取心技术具有良好的适用性与操作性,对于取心工作具有一定的指导意义。

The core can be protected by sealing fluid from being immersed or polluted in the coring through the closed coring operation,consequently,the core can reflect objectively the layer condition.The coring section of Well Cheng 7-Jian 9 is in cenozoic tertiary layer.The construction of well make this more difficult due to loose and poor cementation,large porosity,high permeability,surrounding the injection wells.The closed coring operation is successful,the closed coring footage of the whole well is 61.8m,the length of recovered core is 58.8m,the yield is 95.15%,the sealed efficiency is 89% by tool selecting,parameter optimization,drill fluid system and drill fluid optimization and take the corresponding technical measures.It success for core operation,it indicates that the core technology has good applicability and feasibility and provided guidance for the core operation.