腰英台油田储层非均质性严重,属低孔、特低渗-超低渗、微细喉型储层,具有中等水锁性(平均损害程度40.4%)。水锁损害影响因素分析表明,油水界面张力越高,钻井液滤液等外来流体侵入储层后的含水饱和度越高,储层的渗透率越低,水锁损害程度越严重。由实验可知,提高返排速度,减小钻井液滤液等外来流体侵入的深度,在水驱过程中提高驱动压力梯度可减轻水锁损害;解除水锁损害较合适的途径可能是采用酸化或酸化与压裂相结合的方法增加储层的渗流能力,同时采用低毛管力工作液加强自身的返排,降低二次水锁损害。

The heterogeneity of reservoirs in Yaoyingtai oil field is severe.The reservoirs  are characterized by low porosity,especially low-superly low permeability,micr oscopic throats,moderate water-blocking damage(with an average damage level up  to 40.4%).The analysis of influence factors about water-blocking damage suggest s that the higher the tension between oil and water,the higher the water saturat ion of outside fluid including drilling liquid which intrude reservoirs,the lowe r the permeability,the higher the degree of  water-blocking damage.The results  of experiments suggest that raising the discharge speed,reducing the intrude dep th of outside fluid including drilling liquid,raising the driving pressure gradi ent during water driving can lighten the degree of water-blocking damage.The pr oper way which removes water-blocking damage may be the way of using acidify or  acidify combined with rend,and it can increase the permeate ability of reservoi rs.At the same time,using the low capillary pressure working liquid and strength ening the discharge of itself can reduce the second water-blocking damage.