官深1井超高密度钻井液性能调控关键技术

Key technologies of ultra-high density drilling fluid performance adjustment in Well Guanshen-1

石秉忠 蔡利山 李斌 柴龙 李智斌 彭商平

SHI Bingzhong CAI Lishan LI Bin CAI Long LI Zhibin PENG Shangping

中国地质大学，北京　100083 中国石化石油工程技术研究院，北京　100101 仁智油田技术服务股份有限公司，四川绵阳　621000

China University of Geosciences, Beijing 100083, China Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China Renzhi Oilfield Technology Service Co. Ltd, Mianyang 621000, China

超高密度钻井液存在提高密度困难、流动性及沉降稳定性差、性能调控难度高等多方面的技术问题。官深1井钻遇超高压层后，采用重晶石加重成功实施了2.50~2.87 g/cm3超高密度聚磺钻井液钻进，历时100多天，总进尺达785.9 m，钻井液性能稳定，循环泵压正常，作业安全顺利。结合实际施工情况，对钻井液密度、流变性和沉降稳定性等性能的现场维护处理关键技术进行了分析，探讨了其技术途径，为超高压复杂地层施工提供了可借鉴的超高密度钻井液实用技术和方法。

The problems of ultra-high density drilling fluid are difficulty to improve the density of drilling fluid, poor mobility and settlement stability, and difficulty to control the performance. When ultra-high pressure layer is penetrated in drilling Well Guanshen-1, barite is used as the weighting agent, and the ultra-high density polysulfonate drilling fluid is implemented with the density of 2.50 ~ 2.87 g/cm3. It is lasted more than 100 days, and the total footage amounted to 785.9 m, with stable performance, normal circulating pump pressure, and safe operation. This is the record of the highest drilling density, the shortest operation time and the greatest footage. Combined with the actual operation condition, the key technologies of how to control the density, rheology and sedimentation stability of drilling fluid are analyzed. It provides useful techniques and methods for the application of ultra-high density drilling fluid in ultra-high pressure complex formation.