稠油油藏火驱高温盐析调剖的影响因素研究

Influence Factors of High Temperature Salting Profile Control for Fire Flooding on Heavy Crude Oil Reservoir

蒋海岩 赵黎明 吴 婷 袁士宝 王波毅 王 刚

JIANG Haiyan ZHAO Liming WU Ting YUAN Shibao WANG Boyi WANG Gang

针对稠油油藏火驱开采时存在的气窜影响火驱波及效率问题， 开展了基于高温盐析原理的火驱高温调剖堵剂研究， 考察了氯化钠和硅酸钠堵剂浓度和注入量、 温度、 候凝时间、 填砂管渗透率和非均质性对封堵效果的影响。结果表明， 随着堵剂浓度增加， 封堵率明显上升， 饱和溶液时的封堵率最高； 随着注入体积的增加， 两种堵剂的封堵效果均增强； 随温度升高， 氯化钠的封堵率增大并逐渐稳定， 而硅酸钠的封堵率逐渐降低； 地层温度低于 300℃时， 保持一定的候凝时间可有效提高堵剂的封堵效果， 而温度高于 300℃时， 候凝时间对封堵效果无影响； 填砂管渗透率越高调剖效果越好， 堵剂对高渗透层的封堵效果良好，适用于非均质性地层。图8表 1参 17

Aiming at the problem that gas channeling affected the efficiency of fire flooding on heavy crude oil reservoir exploitation，a laboratory experiment of high temperature profile plugging agent was carried out based on the principle of high temperature salting out. The effect of the influence factors，such as the concentration and injection volume of NaCl and Na2 SiO3 ， temperature，curing time，permeability and heterogeneity of sand filling tube on plugging was studied. The results showed that with increasing concentration of plugging agent，the plugging rate significantly increased which reached the highest in saturation concentration. The sealing effect of two plugging agent enhanced with increasing injection volume. As the temperature rose，the plugging rate of NaCl increased and tended to stability，while that of Na2 SiO3 gradually decreased. Time was needed for salting out when the formation temperature was lower than 300℃ ，which could effectively improve the plugging effect of profile control system. However if the temperature was above 300℃，the time was no need to be considered. The higher permeability of sand filling tube，the better profile control effect and blocking effect of plugging agent on high permeability layer were，which was suitable for the heterogeneous formation.

10.19346./j.cnki.1000-4092.2017.04.018