油藏储层酸化液添加剂的优选

Optimization of Additives for Reservoir Acidization

南襄盆地泌阳凹陷西南部油层的物性特征为：以大孔隙为主要流通孔道，非均质性严重；粘土矿物膨胀性较强，对储层渗透率影响较大．试验筛选了油层酸化液添加剂及最佳使用浓度，主要目的是减少对储层的伤害，延长有效期。试验结果表明：粘土稳定剂GN-2防膨性能较好，有效作用时间长，性能较稳定，浓度在2.0%-3.0%；缓蚀剂WS-1和HS-2效果都不错，加量1．5％～2．0%；但在低伤害酸中使用FS-2效果最佳，加量1．0％；铁离子稳定剂NTA和TEL试验效果都可以，加量1．5％～2．0％，2种稳定剂在80℃温度和pH值大于6以上，均无沉淀产生，具有较好的稳定性；通过对助排剂优化筛选，SH-1最佳，加量2．0％～3．0％；现场应用效果显著。

The reservoir physical properties in the south of Biyang Depression in Nanxiang Basin inclueling big porosity are major flowing pore paths, heterogeneity is serious, swell of clay minerals is stronger, of which influence on reservoir permeability is higher. Additive for acidizing and its optimal concentration are selected in experiment. Its major goal is to reduce formation damage, effective data is extended. The result shows that blowout prevention property of GN-2 clay stabilizer is better, effectiveness is long, its performance is stable with its concentration at 2.0%~3.0%, efficiencies of anticorrosion agents WS-1 and HS-2 are good with dosage of 1.5%~2.0%. but in low damage acid FS-2 is optimal with dosage of 1.0%. Ferric ion stabilizers NTA and TEL are of good experimental effect with dosage of 1.5%~2.0%. pH of both is more than 6 at 80℃ without settlement for good stability. By selecting the additives, it indicates that SH-1 is optimal with dosage of 2.0%~3.0%. the effect of field application is obvious.