Abstract: Basal glutenite and burial hill of the Member 2 of Dongying Formation of Paleogene was drilled in the horizontal section of Well CFD18-1-A2h, where fractures developed, the formation temperature is high, reservoir protection and conventional drilling operations are difficult. Since the oil-in-water drilling fluid has such advantages of low density, small fluctuations in bottomhole negative pressure value, strong stability, good lubricating effect, and less pollution to reservoir, so the horizontal section of Well CFD18-1-A2h is drilled using oil-in-water drilling fluid combined with managed pressure drilling technology. During drilling and completion, oil-in-water drilling fluid is steady, ROP is high, trip-in is normal, and screen is inserted to target depth. Flowing production of is 200% of ODP and reservoir is protected well.

Key words: oil-in-water drilling fluid, wellbore stability, reservoir protection

摘要： CFD18-1-A2h井水平段钻遇古近系东营组二段底部砂砾岩及古潜山,裂缝发育,地层温度较高,储层保护压力大,常规钻井液作业难度大。由于水包油钻井液具有密度低、井底负压值波动小、稳定性强、润滑效果好、对储层伤害小等优点,所以选用了抗高温低密度水包油钻井液配合压力控制钻井技术钻进。钻完井作业期间,水包油钻井液性能稳定,机械钻速较高,起下钻正常,筛管顺利下至设计深度,投产后自喷状态即超配产100%,储层保护效果显著。

关键词: 水包油钻井液, 井壁稳定, 储层保护