论文详情
针对污水回注井酸化效果不理想的问题，利用岩心流动实验、悬浮物含量及粒径测试、X射线衍射对堵塞情况进行了分析。在此基础上，利用填砂管流动和岩心溶蚀实验研发了一套兼具污油清洗与高溶蚀率的酸液体系。此外，结合储层特征优化了酸液置放工艺。结果表明，污油和固体悬浮物在近井地带形成的复合堵塞物是造成储层堵塞的主要原因；1%水基清洗剂洗油率达到86.44%，高溶蚀酸对固体悬浮物溶蚀率达到89.77%，二者复配体系能够快速瓦解油泥小球；化学微粒分流剂可对储层形成有效暂堵分流，且酸化后自动溶解。该技术矿场应用8井次，平均视吸水指数提高1.74倍。该技术适用于污水回注井解堵，并为提高海上污水回注井酸化效果提供理论和实践依据。
Aiming at the problem that the acidification effect of sewage reinjection wells was not ideal, the core flow experiment, suspended matter content and particle size test, and X-ray diffraction were used to analyze the blockage. On this basis, an acid system with both dirty oil cleaning and high dissolution rate was developed by using sand-filled pipe flow and core dissolution experiments. In addition, the acid placement process was optimized in combination with reservoir characteristics. The results show that the main reason for reservoir plugging is the composite plugging formed by waste oil and solid suspended matter in the near-wellbore area. The oil removal rate of 1% water-based cleaning agent reached 86.44%, and the dissolution rate of high dissolution acid to suspended solids reached 89.77%. The two compound systems can quickly disintegrate oil sludge pellets. Chemical micro-particle diverting agent can form an effective temporary plugging diversion for the reservoir, and automatically dissolve after acidification. The technology has been applied in 8 wells, and the average apparent water absorption index is increased by 1.74 times. This technology is suitable for plugging removal of sewage reinjection wells and provides theoretical and practical basis for improving the acidification effect of offshore sewage reinjection wells in offshore oil fields.