喇萨杏油田厚油层顶部挖潜可行性研究

THE FEASIBILITY RESEARCH ON REMAINING OIL RECOVERY IN THE TOP OF THICK BEDS IN LA-SA-XING OILFIELD

喇萨杏油田主力油层受非均质性的影响，注入水无效低效循环严重，开采效果差，厚油层顶部存在大量剩余油，目前技术水平下，缺乏有效的动用手段。针对不同的油层条件，从油层沉积类型入手，分析了剩余油分布特征，提出了相应的挖潜工艺技术。水平钻孔技术和改性氰凝封堵封窜技术，适用于挖潜层内有稳定夹层的厚油层顶部剩余油；定位压裂人造隔板技术和层内相渗透改善剂控水挖潜技术，适用于挖潜无稳定夹层的厚油层顶部剩余油。这4项技术研发成功后，可为厚油层顶部剩余油挖潜提供有效技术手段。

Due to the affection of heterogeneity in the main layers in La-sa-xing Oilfield, the inefficiency or low-ef- ficiency of injected water circulation is serious, and the recovery efficiency is relatively low. An amount of remai- ning oil in the top of thick beds cant be reached under the present technology level because of lacking of effective developing methods. According to different reservoir conditions and basing on the types of oil reservoir sedimenta- tion, this paper analyses the distribution characteristics of remaining oil were analyzed and the corresponding explo- ring techniques were proposed in this paper. Such as horizontal drilling technique and modified polyurethane Qingn- ing plugging technique which can be used to explore the remaining oil in the top of thick beds with stable interbed barrier, positioning fracture artificial barrier technique and internal RPM （ Relative Permeability Modifiers ） water controlling technique which can be used to explore the remaining oil in the top of thick beds without stable interbed barrier. The successful development of the four techniques above can provide effective methods for the recovery of remaining oil in the top of thick beds.