海安油区袁101井区储层敏感性试验研究

The Sensitivity Experiments of Reservoir of Well Yuan-101 in Hai'an Area

试验研究了海安油区袁101井的油层取心岩样的敏感性。结果表明,临界流速1.46m/d,速敏指数为0.46,速敏损害程度中等偏弱;水敏指数为0.53,水敏损害程度中等偏强,临界矿化度22950mg/L;碱敏指数为0.05,无碱敏损害。酸敏指数为0.14,酸敏损害程度中等偏弱;围压≤18MPa下,应力敏感性引起的渗透率损害率为55.35%,损害程度中等偏强;应力敏感性引起的不可逆渗透率损害率为13.78%。

The sensitivity experiments studying the flow rate sensitivity,the water sensitivity,the alkali sensitivity,the acid sensitivity and stress sensitivity of the core from Well Yuan-101 in Hai'an Area conducted for simulating reservoir conditions.The results of these experiments indicate that the critical flow rate is 1.46mg/d,the flow rate sensitive index is 0.46,it indicated the medium weak of speed sensitive damage.And the water sensitive index is 0.53,the critical mineralization is 22950mg/L for the medium strong of water sensitive damage.And the alkali sensitive index is 0.05 without alkali sensitive damage.And the acid index is 0.14 for causing medium weak of acid sensitive damage.And the ratio of permeability damage caused by stress sensitivity in less than or equal to 18MPa confining pressure is 55.35%,demonstrating stress sensitive is medium weak while the ratio of irreversible permeability damage is 13.78%.