杏树岗油田厚油层顶部剩余油水平井强碱三元复合驱试验效果

发布时间：2019-06-21 12:40

【摘要】：杏树岗油田经过50多年开发已进入特高含水期,三次采油取得了较好开发效果。但由于受油层非均质性影响,厚油层顶部开发效率低,剩余油富集,层内矛盾突出,常规方法挖潜难度较大。为改善层内动用状况,探索挖潜厚油层顶部剩余油方法,开展了水平井强碱三元复合驱现场试验。通过优化水平轨迹、水平段长度、入靶点方向、射孔方式及完井方式设计,应用室内评价结合其他区块三元体系配方,优化注入参数设计,提高方案匹配率,试验取得较好效果,有效缓解了层内矛盾,提高了油层动用程度,采收率提高30%以上。该研究明确了水平井强碱三元复合驱动态变化规律,客观评价了水平井强碱三元复合驱的可行性,为厚油层顶部剩余油挖潜提供了新思路,为三次采油开发调整开辟了新途径。
[Abstract]:Xingshugang Oilfield has entered the ultra-high water cut stage after more than 50 years of development, and the tertiary oil recovery has achieved good development effect. However, due to the influence of reservoir heterogeneity, the top development efficiency of thick reservoir is low, the remaining oil is enriched, and the contradiction in the layer is prominent, so it is difficult to tap the potential of the conventional method. In order to improve the production situation in the layer and explore the method of tapping the remaining oil at the top of the thick reservoir, the field test of strong alkali ASP flooding in horizontal wells was carried out. By optimizing the horizontal trajectory, horizontal segment length, target direction, perforation mode and completion mode design, the laboratory evaluation combined with the ternary system formula of other blocks is applied to optimize the injection parameter design and improve the matching rate of the scheme. The test has achieved good results, effectively alleviated the intra-layer contradiction, increased the reservoir production degree, and increased the oil recovery by more than 30%. This study clarifies the change law of strong alkali ternary compound driving state in horizontal well, objectively evaluates the feasibility of strong alkali ASP flooding in horizontal well, provides a new idea for tapping the potential of remaining oil at the top of thick reservoir, and opens up a new way for the adjustment of tertiary oil recovery development.
【作者单位】：大庆油田有限责任公司第四采油厂;
【基金】：中国石油天然气股份有限公司重大科技专项“大庆油田4000万吨持续稳产关键技术研究”(2011E-120607)
【分类号】：TE357.46

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