深度开发高含水油田提高采收率问题的探讨

AN APPROACH TO DEEP DEVELOPMENT OF HIGH WATER-CUT OIL FIELDS TO IMPROVE OIL RECOVERY

本文从我国陆相油藏的具体地质条件出发，回顾了老油田的开发历程和发展的阶段性，提出当前高含水老油田已进入深度开发的新阶段。分析了这个阶段地下剩余油分布的总格局和总特点，指出油层内剩余油已呈高度分散状态，但仍有相对富集的部位；分析了新阶段油田开发在工作目标、挖潜对象、研究深度以及技术措施等方面所发生的新变化。文中还进一步根据我国储层的非均质特征和构造的复杂性，着重分析了剩余油分布的规律，提出要发展精细油藏描述、水淹层测井、精细数值模拟等配套的新技术，针对剩余油相对富集的部位进行综合治理，才能经济有效地进一步提高石油采收率。文中提出了各种旨在提高采收率的配套技术措施。

Based upon the nonmarine geological conditions of various oil fields in our country, after a review of development history by stages, this paper suggests that at the present time the reservoir management of high and very high water-cut oil fields have entered into a new period as called 'deep development period', and the status of the courrent distribution of remaining oil in these fields are analyzed. It is pointed that in thisperiod the distribution of remaining oil in these reservoirs in highly scattered in general while some relatively aboundant areas are still presented. Moreover, the change of the target and strategy of reservoir management and the technology of operation in this period are analyzed also. Therefore, the difficulty of operation and the depth of geological and engineering study should be increased greatly. According to the heterogeneity of reservoirs and the complexity of structures, the characteristics of distribution of remaining oil in the reservoirs are described. It is indicated that the sophisticated reservoir characterization, the residual oil saturation logging and detailed numerical simulation should necessarily be developed in order to recognize the specific distribution of remaining oil, and then a whole set of comprehensive technologies and operations should be used in the light of this remaining oil distribution in order to improve the oil recovery effectively and economically.