Drilling fluid is the first extraneous fluid which contacts the hydrocarbon reservoir and often invades the reservoir more or less under a certain pressure difference.

• 钻井液是最先接触油气层的外来流体,在一定的压差下总会或多或少地侵入储层,如果钻井液滤液与储层不配伍,很可能引起粘土水化膨胀、水锁、乳化及化学沉淀,导致对储层的损害。