相国寺储气库固井井筒密封完整性技术

Wellbore seal integrity cementing technology of underground gas storage in Xiangguosi

范伟华 冯彬 刘世彬 周利 刘洋 王志刚 龚孝林 宾国成

中国石油集团川庆钻探工程公司井下作业公司，四川 成都 610051

CCDC Downhole Service Company, Chengdu 610051, China

确保安全运行是相国寺储气库建设的首要原则，而井筒长期注采的密封性是保证储气库长寿命、安全运行的关键。文中从固井工艺技术、套管串密封完整性技术、水泥浆体系优化等方面入手，通过室内试验研究、软件模拟及现场试验，形成了地层动态承压试验、提高顶替效率、预应力固井、气密封性检测、管外封隔器以及韧性水泥浆等系列技术，能够保证注采井井筒的长期密封完整性，使固井质量满足相国寺储气库注采井固井的需求。相储8井244.5 mm尾管固井施工综合运用了该套技术，CBL测井显示水泥胶结合格率达到93.1%，且固井后未发生环空带压现象。

Ensuring the safe running of underground gas storage is the first principle of gas storage construction in Xiangguosi. And ensuring the long-term injection-production sealing of wellbore is the key to guarantee the long-life safe running of gas storage. From aspects of technology, casing string seal integrity and optimization of slurry, wellbore integrity cementing technology is developed through laboratory experiment research, software simulation and field experiment, including layer dynamical pressurization test, improved displacement efficiency, prestressing force cementing, air tight test of well casing, external packer and flexible slurry. Utilizing the above techniques, the long-term injection-production sealing of underground gas storage in Xiangguosi can be ensured. Cementing quality is fit for the demand of underground gas storage in Xiangguosi. Taking 244.5 mm liner cementing of Well Xiangchu 8 as an example, the qualification rate of cement bond shown by acoustic amplitude log attains 93.1% and gas breakthrough in annular has not happened after cementing by utilizing the technology.

10.6056/dkyqt201401025