CAJ | 학술논문

当前普遍认为长期水驱后，储层孔隙度、渗透率、润湿性都会发生一定程度的改变，储层参数的变化对残余油饱和度会产生什么样的影响，对此研究甚少。针这一问题，选取两组平行天然岩心开展室内模拟实验。第一组岩心代表“高渗”；第二组岩心代表“低渗”。每组岩心包括两块样品，将每组岩心 A 号样品连续水驱，而 B 号样品当含水达90％以后，停止驱替，老化岩心90 d 后再继续驱替。实验结果表明，当长期水驱后，储层岩石残余油饱和度发生大幅度降低，最大降幅达50％以上。根据实验结果指出，开展油藏工程和数值模拟研究时，考虑储层岩石残余油饱和度变化，才能使模拟结果准确反映油藏实际特征。
당전보편인위장기수구후，저층공극도、삼투솔、윤습성도회발생일정정도적개변，저층삼수적변화대잔여유포화도회산생십요양적영향，대차연구심소。침저일문제，선취량조평행천연암심개전실내모의실험。제일조암심대표“고삼”；제이조암심대표“저삼”。매조암심포괄량괴양품，장매조암심 A 호양품련속수구，이 B 호양품당함수체90％이후，정지구체，노화암심90 d 후재계속구체。실험결과표명，당장기수구후，저층암석잔여유포화도발생대폭도강저，최대강폭체50％이상。근거실험결과지출，개전유장공정화수치모의연구시，고필저층암석잔여유포화도변화，재능사모의결과준학반영유장실제특정。
It's widely believed that reservoir parameters including reservoir porosity,permeability,and wettability will change to certain extent after long -term water flood,however,there are few studies on the effect of the reservoir parame-ters'change on residual oil saturation.Aiming at the problem,two groups of parallel natural cores are selected to do physi-cal simulation experiments.Cores of the first group,which are characterized by high permeability,represent the high perme-ability reservoir.Cores of the second group having low permeability are used to stand for the low permeability reservoir. Each group contains two core samples.Sample No.A in each group was continually driven by water,while sample No.B in each group was driven by water until the water cut reaches 90 percent,and then the sample aged for 90 days continued to be driven by water.The results show that residual oil saturation of reservoir cores decline dramatically with the maximum decreasing amplitude of above 50% after long -term flood.Hence,the variance of residual oil saturation of reservoir rocks should be taken into account in the reservoir engineering and numerical simulation study so that the simulation results can reflect correctly the practical characteristic of reservoir.