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单家寺稠油油藏已进入高轮次、高含水、高采出程度开发后期,开发中的矛盾日益突出,蒸汽吞吐效果越来越差,水淹程度日益加剧,单2块和单10块大部分油井的综合含水达到90%以上。结合油藏实际,选取该区块单6-16-10井,利用油藏数值模拟技术,建立三维地质模型;在历史拟合的基础上,对氮气泡沫改善蒸汽吞吐开发效果进行了油藏适应性研究;并在此基础上,优化氮气泡沫在蒸汽吞吐过程中的注入时机、注入方式和注入参数,同时进行生产指标预测。研究结果表明,氮气泡沫在转注初期,以段塞式注入效果较好,最佳注入参数为:泡沫剂质量浓度为0.6%(质量分数),氮气总量为90000m3(标准)左右。自2006年来,该技术在胜利油田应用273井次,平均周期措施增油842t,油汽比提高0.3以上。本研究对氮气泡沫+蒸汽吞吐技术的推广应用具有理论和实践价值。
The single-reservoir heavy oil reservoir has entered the late stage of development with high water cut and high water cut. The contradictions in the development have become increasingly prominent. The effect of steam huff and puff is worse and worse, and the degree of flooding is getting worse. The combined water content of most oil wells reaches more than 90%. According to reservoir reality, a single 6-16-10 well was selected and a three-dimensional geological model was established by reservoir numerical simulation. Based on the history fitting, the effect of nitrogen foam on improving steam huff and puff development was evaluated by reservoir adaptation On the basis of this, we optimize the injection timing, injection method and injection parameters of nitrogen foam during the steam huff and puff, and predict the production index at the same time. The results show that the initial injection of nitrogen foam is better with slug injection. The optimal injection parameters are as follows: the mass concentration of foaming agent is 0.6% and the total amount of nitrogen is about 90000m3. Since 2006, this technology has been applied in Shengli Oilfield 273 times, the average cycle of measures to increase oil 842t, oil-steam ratio increased by 0.3 or more. This research has theoretical and practical value for the popularization and application of nitrogen foam + steam huff and puff technology.