Research on Reservoir Damage Mechanism and Protection Technology of Fracture- void Dual Medium Reservoir

The reservoir harm mechanism and protection technology of fracture-void dual medium reservoir in the drilling process were reviewed. The reservoir mechanisms included solid phase invasion, reservoir fluid sensitivity, stress sensitivity, water-lock effect and so on. Selecting appropriate drilling fluid system and using necessary drilling craft including shielded temporary plugging technology (crack width﹤100μm) and underbalanced drilling technology (crack width >100μm)) were the reservoir protection methods of dual medium reservoir. Determination fracture effective flowing width accurately and selecting optimally temporary plugging agent matching up with the reservoir were the key of shielded temporary plugging technology. Selecting reasonable wellbore fluid and appropriate negative pressure was the core of underbalanced drilling technology. It is pointed that superiority supplementary of underbalanced drilling technology and shielded temporary plugging technology is the development direction of fracture- void dual medium reservoir protection in the future.

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