可动凝胶的封堵性能及其对渗流规律的影响

Plugging property of mobile gel and its effect on porous flow

姚同玉 李继山

YAO Tongyu LI Jishan

中国石油大学石油工程学院，山东东营　257061 胜利油田有限责任公司地质科学研究院，山东东营　257015

Faculty of Petroleum Engineering, China University of Petroleum, Dongying 257061, China Geological Scientific Research Institute of Shengli Oilfield Company Ltd., Dongying 257015, China

可动凝胶在油田稳油控水中具有重要应用，可动凝胶的封堵行为及其对油水渗流规律的影响对于油田的高效开发具有重要意义。为此，用常规岩心驱替流程进行了可动凝胶对岩心的封堵性能实验及可动凝胶对油、水单相渗流的影响实验。实验结果表明：对于渗透率低于2200×10-3 μm2的岩心，可动凝胶的有效封堵能力在90%以上；油水在可动凝胶封堵的岩心中单相渗流呈现非线性渗流特征，油相启动压力低于水相启动压力，油相渗流能力大于水相渗流能力；油水在可动凝胶封堵的岩心中两相渗流特征也发生变化，两相区范围变?，油水渗流能力变差，油相相对渗透率恢复明显高于水相，说明可动凝胶对水相的封堵远大于对油相的封堵，可以稳定油相，控制水相。

Mobile gels are important to stabilize oil production and control water cut in oilfields. The plugging property of mobile gels and its effect on porous flow are of great significance to the high-efficiency development of oilfields. So the conventional core displacement process is used for the experiment of the effect of mobile gels on the plugging of core and the single-phase oil and gas flow. The experimental results show that the plugging ratio of the mobile gels is more than 90% for the core with the permeability lower than 2200×10-3 μm2. The single-phase porous flow plugged by mobile gels is nonlinear, the starting pressure of oil is lower than that of water, and the permeability of oil is higher than that of water. The two-phase porous flow plugged by mobile gels is changed as well, i.e., the range of oil and water flow gets smaller simultaneously, the permeability of oil and water gets lower,the permeability recovery of oil is higher than that of water. Both porous flow experiments show that the gels present higher plugging capacity to water than to oil, and may be used to stabilize oil production and controll water cut.