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渗透率恢复值在一定程度上受返排压差的影响,随返排压差的增加,渗透率恢复值逐渐增大。从门限流入压差和渗透率恢复值两方面评价储集层钻井液对储层的损害更准确。试验结果表明,3种储集层钻井液体系在同一条件下的性能相比,正电胶型的门限流动压差最低,渗透率恢复值最大,对储层的损害也最低,复合金属聚合物型的门限流动压差居中,渗透率恢复值居中,对储层的损害也居中;两性离子聚合物型的门限流动压差最大,渗透率恢复值最小,对储层的损害也最大。
The recovery value of permeability is affected by back pressure difference to a certain extent. With the increase of back pressure difference, the permeability recovery value increases gradually. It is more accurate to evaluate reservoir damage by reservoir drilling fluid from the threshold inflow pressure difference and permeability recovery value. The experimental results show that compared with the performance of the drilling fluid system of the three reservoirs under the same conditions, the positive pressure gel has the lowest threshold pressure differential pressure, the highest permeability recovery value and the lowest damage to the reservoir. The composite metal polymer Type threshold flow rate is centered, the permeability recovery value is middle, and the damage to the reservoir is also centered. The zwitterionic polymer type has the highest threshold pressure drop and the lowest permeability recovery value, and also has the most damage to the reservoir.