富含铁致密砂岩储层的酸敏性评价——以川中地区上三叠统须家河组气藏为例

为了解决致密砂岩储层酸化效果不理想的问题，从致密砂岩储层的特殊地质特征出发，选取川中地区典型致密砂岩气藏的岩心样品，模拟酸化作业条件进行实验评价。结果表明，盐酸对储层的损害率为73．35％-85．30％，损害程度为强；氢氟酸对储层的损害率为11．66％-65．64％，损害程度为弱；氟硼酸对储层的损害率为56．39％-95．00％，损害程度为中一强。综合研究表明，对富含铁粘土矿物的致密砂岩储层，应加强其地质特征研究，使用与地层配伍的酸液配方才能减少对储层的损害，达到提高产量的效果。

Evaluation on acid sensitivity of the tight sandstone reservoirs with rich iron-taking Xujiahe gas reservoir in upper Triassic of Chuanzhong area as an example

In order to improve unsatisfactory acidizing effect in the tight sandstone reservoir,experiment is run to evaluate at the conditions of simulated acidizing selecting core samples in the typical tight sandstone gas reservoir of Chuanzhong area. The analysis is from special geologic characteristics of the tight sandstone reservoir. The experimental results indicate the damage ratio of HCl,HF and HBF4 is 73.35% -85. 30% ,11.66% -65.64% and 56. 39%-95. 00% , and their damage degree is strong, weak and medium-strong respectively. The comprehensive research shows that the geologic characteristics of the tight sandstone reservoir with rich iron clay mineral should be researched particularly, and the acidizing fluid formula matched with the formations can be used to reduce the formation damage and to improve the production rate.