库车山前高温高压气井完井封隔器失效控制措施

Failure Control of Completion Packer in the High Temperature and High Pressure Gas Well of Kuqa Piedmont Structure

王克林 刘洪涛 何文 何新兴 高文祥 单锋

WANG Kelin LIU Hongtao HE Wen HE Xinxing GAO Wenxiang SHAN Feng

中国石油塔里木油田分公司油气工程研究院，新疆库尔勒 841000 新疆华油油气工程有限公司，新疆库尔勒 841000 中国石油塔里木油田分公司生产运行处，新疆库尔勒 841000 中国石油塔里木油田分公司克拉油气开发部，新疆库尔勒 841000

Research Institute of Oil & Gas Engineering, PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000, China Sinopetroleum Technology Inc, Korla, Xinjiang, 841000, China Production Operation Department, PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000, China Kela Oil & Gas Development Department, PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000, China

库车山前高温高压气井主要采用Y443-111封隔器，但封隔器在替液过程中易憋压，严重时甚至出现封隔器提前坐封问题，导致油套环空的试油钻井液无法被环空保护液完全替出，后期可能对油管、套管柱产生腐蚀。针对上述问题，分析了Y443-111封隔器替液过程中失效与损坏的原因，发现造成该封隔器失效的主要原因是封隔器与套管的间隙太小，次要原因是替液排量大和井筒清洁情况差。为此，制定了降低替液排量、清除井筒杂质、优化试油钻井液性能、提高井筒工作液质量和缩小封隔器外径等控制完井封隔器失效的措施。上述措施在现场累计应用43井次，成功率达97.6%，解决了库车山前高温高压气井完井封隔器失效的问题，确保了高温高压井下作业安全和完井作业的顺利施工。

The Y443-111 packer was mainly used in the high-temperature and high-pressure (HTHP) gas wells in the Kuqa Piedmont structure , and it was prone to build the pressure during fluid displacement. In serious cases, the packer was set ahead of time, resulting in the test drilling fluids failed to be completely replaced by annulus protection fluid, which could cause the corrosion of tubing and casing. In view of the above problems, the causes of the failure of Y443-111 packer during fluid replacement were analyzed. It was found that the main factor was the small size of gap between the packer and the casing, and the secondary factors were the high displacement rate of fluid and the poor cleanliness of the wellbore. For these reasons, measures such as reducing fluid displacement rate and the outer diameter of the packer, cleaning up the wellbore impurities, optimizing the properties of oil based drilling fluids, and improving the quality of wellbore operation fluids were taken. These measures had been applied in the field for 43 wells with a success rate of 97.6%, which effectively controlled the packer failure of HTHP gas wells in the Kuqa Piedmont structure and ensured the safe downhole operations and smooth well completions.

国家科技重大专项“超深超高压高温气井优快建井与采气技术”（编号：2016ZX05051-003）、中国石油天然气股份有限公司重大科技专项“超深高温高压气井井完整性及储层改造技术研究与应用”（编号：2018E-1809）资助

https://doi.org/10.11911/syztjs.2020128