Research Article

Study on Damage Mechanism of Waterflooding Development in Weizhou 11-4N Low-Permeability Oilfield

Table 3

Experimental results of velocity sensitivity, water sensitivity and salt sensitivity in the Weizhou 11-4N oilfield.

Type of experimentSample numberWell depth (m)LithologyDamage rate (%)Damage assessment

Speed sensitivityA12208.53Sandstones96.68Strong
Speed sensitivityA22209.17Sandstones1455.77Strong
Speed sensitivityA32086.76Sandstones133.36Strong
Speed sensitivityA42171.89Sandstones39.05Moderately weak
Water sensitivityB12087.67Sandstones36.6Moderately weak
Water sensitivityB22086.79Sandstones78.89Strong
Water sensitivityB32209.41Sandstones33.04Moderately weak
Water sensitivityB42092.31Sandstones32.79Moderately weak
Water sensitivityB52088.73Sandstones41.27Moderately weak
Water sensitivityB62087.49Sandstones29.75Weak
Water sensitivityB72209.58Sandstones13.51Weak
Salt sensitivityC12209.04Sandstones89.11Strong
Salt sensitivityC22230.7Sandstones48.92Moderately weak
Salt sensitivityC32221.84Sandstones/None
Salt sensitivityC42225.38Sandstones35.35Moderately weak