摘要
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。
Shanjiasi heavy oil reservoir has entered the production tail with increasingly prominent problems of multicycle,high water cut and high degree of reserve recovery,and the effect of steam stimulation is getting worse and water out behavior is more obvious.The composite water cut in the most oil wells of block Shan 2 and Shan 10 has been more than 90 percent.According to these problems and the actual situation of the reservoir,well Shan 6-6-10 in this block was selected and its 3D geologic model was built by numerical simulation.Reservoir′s adaptability of improving development effect of steam stimulation with nitrogen foam was studied based on the model′s history match.And the injection time,way and parameters of the nitrogen foam during huff and puff were optimized and production targets were predicted.The results of the study show that nitrogen foam would work better at early period of conversion with 0.6% of the foamer′s mass concentration and 90000Nm3 of gross nitrogen as the best injection parameters.Since 2006,the technology has been applied in Shengli oilfield for 273 well-times with 842t of an average incremental oil produced by one cycle and the oil-steam ratio increased more than 0.3.The research has a significant theoretical and practical significance in the popularization and application of steam stimulation with nitrogen foam.
出处
《中外能源》
CAS
2012年第1期61-65,共5页
Sino-Global Energy
关键词
氮气泡沫
蒸汽吞吐
数值模拟
现场试验
nitrogen foam
steam stimulation
numerical simulation
field experiments
