Reservoir protection technique for Sumatou structure in Sichuan Basin

Sumatou structure in Sichuan Basin is a strongly water-sensitive reservoir and prone to fluid locking.The main factors and mechanism of reservoir damage are analyzed through experiments and field evaluation.The types of reservoir damage are studied for processes of drilling,cementing,perforating,oil testing,stimulation treatment and gas production,and corresponding reservoir protection techniques are presented.Field application of the reservoir protection techniques has been successful.This may guide future oil and gas field exploitation in Sichuan Basin.