Study on damage mechanism of middle-low permeability reservoir in Nanpu Oilfield and drilling fluid technical countermeasures were conducted. The experimental evaluations of core sensitivity and water blocking damage showed that, the deep reservoir in Nanpu Oilfield was a highly water sensible and highly water blocking middle-low permeability reservoir with low permeability rate and high clay content. In the drilling process the main damage was done by the reservoir water sensitivity and water blocking, which was caused by the invasion of drilling fluid filtrate. Aming at the damage mechanism,the technical countermeasures,such as a-dopting drilling fluid with strong sealing, low tension and strong inhibition, should be effective to protect the middle-low permeability reservoir in Nanpu Oilfield.%对南堡油田中低渗储层损害机理及钻井液技术对策进行了研究.储层岩心敏感性和水锁损害等实验评价表明,南堡油田中深层储层渗透率低、粘土含量高,属于水敏、水锁较强的中低渗储层.钻井过程的主要损害因素是钻井液滤液侵入引起的储层水敏和水锁损害.针对储层损害机理,采用强封堵、低张力、强抑制钻井液是有效保护南堡油田中低渗储层的根本措施.
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