Oil layer protection technology research in Baiqiu region of Zhangdian oilfield

Reservoir sensitivity in Baiqiu region of Zhangdian oilfield was evaluated, and the damage factors and degree in the process of exploitation is confirmed. Aimed at the main damage factors oil layer protection killing fluid and washing fluid formula are selected, which has good compatibility with the reservoir. Core permeability retention rate is 97.4%, which can play the role of protecting the reservoir.