摘要
致密砂岩储层在钻井过程中容易出现扩孔、卡钻、污染储层的现象。现有的钻井液体系无法实现高效且安全钻井和有效保护储层的目标。通过对A区块致密砂岩储层岩性和物性分析,确定钻井过程中的主要储层损害因素为强碱敏、中-强盐敏和水敏储层敏感性损害、水锁损害、应力和温度敏感性损害。通过室内试验对生物聚烯钻井液体系进行了研究。室内评估表明,钻井液体系可以抵抗150℃的温度,抑制性好,抗污染能力强,对页岩的岩石强度影响小,有利于页岩井壁的稳定。此举可为致密砂岩储层保护提供新的技术思路与方法,同时满足现场对于钻井安全性及测井的要求。
Tight sandstone oil and gas reservoirs are prone to complex accidents such as well collapse, undercutting,stuck drilling, and reservoir pollution during the drilling process. The existing drilling fluid system cannot meet the requirements for safe and rapid drilling and reservoir protection. Tight sandstone reservoirs in the block were analyzed in terms of reservoir lithology and physical properties, and the main reservoir damage factors in the drilling process were determined to be strong alkali sensitivity, moderate to strong salt and water sensitive reservoir sensitivity damage, water sensitivity and stress and temperature sensitivity damage. The biopolyolene drilling fluid system was researched through laboratory experiments, and the laboratory evaluation showed that the drilling fluid system could withstand a temperature of 150 ℃, and had good inhibition and strong anti-pollution ability. It had little influence on the rock strength of shale, which was beneficial to the stability of shale shaft wall. This paper can provide new technical ideas and methods for tight sandstone reservoir protection to meet the on-site drilling safety and logging requirements.
作者
万华旭
WAN Hua-xv(China Petroleum&Chemical Corporation North China Oil and Gas Branch,Ordos Inner Mongolia 017400,China)
出处
《当代化工》
CAS
2022年第1期73-76,共4页
Contemporary Chemical Industry
基金
“十三五”国家科技重大专项《大型油气田及煤层气开发》子课题(项目编号:2016ZX05043-002)。
关键词
致密砂岩
储层保护
生物聚醇烯
钻井液体系
储层敏感性评价
Tight sandstone
reservoir protection
Biopolyolene
Drilling fluid system
Reservoir sensitivity evaluation
