断块油藏的单井吞吐技术

Single well huff and puff technology for faulted block reservoirs

我国油田存在着大量的复杂小断块油藏,这类油藏具有面积小、构造复杂、非均质性强等特点,而且在经济上只允许打一口井。同时由于断层相互切割遮挡造成四周封闭,开发过程中无外来能量的补充,造成地层能量下降迅速,产量递减很快。针对这类问题,研究人员提出了注水吞吐,通过补充地层能量来提高小断块油藏的储量动用程度。通过结合CMG地质建模软件,建立了三维地质模型,并进行了生产数据的历史拟合,使得地质模型能够很好地反映断块油藏的地质特征,为后续吞吐技术的研究和工艺参数的优化打下基础。利用CMG油藏数值模拟器实现了注水吞吐工艺,并对周期注水量、注水速率、焖井时间等参数进行了优化,数值模拟表明优化的参数可增加累积采油量。

Among many of the oilfields in China,there are a large number of complex faulted block reservoirs.The areas of these reservoirs are often small,and Only one well is worth being drilled to be economical.These reservoirs are closed by the faults,and without external energy supply,therefore,the formation pressure declines quickly,which results in fast declines of oil rate.To solve these problems,this paper investigates the huff and puff technology to enhance oil recovery by injecting water.In this paper,a 3D faulted block reservoir model is built using CMG geological modeling builder,and the history matching production data is carried out to make the geological model can well reflect the geological characteristics of the faulted block reservoir,which is valuable in optimizing the huff and puff process.The water huff and puff process is implemented by the CMG reservoir numerical simulator,and the parameters such as cumulative water injection,water injection rate and soaking time are optimized.The optimized parameters can be used to increase the cumulative oil recovery.