正韵律模型三元复合体系驱油实验研究

ASP flooding experiments of positive rhythm rock models

将3支不同气体渗透率单管人造岩心并联,分别计量3支岩心产出油水,模拟二维纵向非均质正韵律油层,进行三元复合体系驱油实验,根据实验结果综合分析油层纵向各部位三元复合体系驱油前后的含水率、产液百分比、原油采收率等变化特征和渗流机理。又利用二维纵向正韵律3层非均质人造岩心进行三元复合体系驱油与水驱油的对比实验,将水驱后和三元复合驱后的一组岩心剖开摄像录入计算机中,利用彩色图像量化分析系统对内部各层进行量化分析,综合分析纵向非均质层状正韵律人造岩心三元复合体系驱油的波及系数及驱油效率。三元复合驱油水流度控制和原油乳化能够明显减缓层间矛盾,大幅度提高原油采收率,且中渗透率层提高采收率幅度最大;二维纵向非均质正韵律模型三元复合驱油过程中,高渗透率层以提高驱油效率为主,中渗透率层既提高驱油效率也扩大波及体积,低渗透率层以扩大波及体积为主。驱油效率占提高采收率的比例平均为55.75％。

An ASP flooding experiment was conducted on man-made rock model to simulate two-dimension vertical heterogeneous positive rhythm reservoir. The man-made rock model was made up of three single man-made rock samples which were connected parallelly. In the experiment, produced oil and water were measured separately. Base on the experimental results, a synthetic analysis was used to reveal the water cut differences, the produced fluid percent, oil recovery factor and vadose mechanism of the vertical areas before and after the ASP flooding. Using the two-dimension vertical heterogeneous positive rhythm man-made three-layer rock samples, ASP flooding and water flooding comparative experiments were also progressed. After the experiments, cut open the rock samples and took the sectional view into the computer, then use the color image analysis system to get the oil saturation profile data. The increased oil displacement efficiency and the enhanced conformance efficiency by the ASP flooding were synthetically analyzed. Water-oil mobility control and crude oil emulsions of the ASP flooding can reduce the contradictions among the layers and improve the oil recovery by a large extent, and the extent of oil recovery enhanced by the medium permeable layer is highest among three layers. Average oil recovery from the increased oil displacement efficiency is 55.75%.