底水油藏多分支井水脊突破规律研究

【作者】 段永刚； 陈伟； 李冬梅； 何吉祥；

【机构】 西南石油大学；

【摘要】 尽管多分支井在底水油藏中提高产能十分有效,但不同的分支结构在抑制底水锥进方面的优劣如何,是影响底水油藏中应用分支井技术提高采收率的关键因素。本文根据多分支井的渗流特点,针对非稳态流动特性,采用井筒流动与油藏流入相互作用的耦合模型,得到了多分支井在每个分支上的流入剖面;由对比流率分布规律可知:多分支井的突破时间分布与流入流率分布有类似之处,即低流率早突破;通过突破时间沿井眼轨迹的分布规律研究认识分支井的水脊形态,对复杂结构井的布局模式、空间结构优化,确定合理工作制度,延缓见水,提高无水累积产量和采收率具有重要的意义。更多还原

【Abstract】 Although the multi-lateral well is effective in improving productivity for bottom water reservoir,the capability in inhibition of bottom water cone of different branch structures is the key factor in enhancing oil recovery.This paper based on the characteristic of seepage flow and transient state flow of multi-lateral well make use of the couple model for well-bore flow and reservoir inflow model and obtain the inflow profile for each branch of multi-lateral well.By comparison of the distribution of flow rate in different branches,we can learn that the distribution of water breakthrough time in multi-lateral is similar to the distribution of inflow rate,namely,the time of water breakthrough is earlier at the position of low flow rate.Understanding the pattern of water cone by research work on the distribution of breakthrough time along well bore is very important to pattern of advanced well,the optimization of space structure,setting proper production for postponing the water breakthrough,increasing of the cumulative production without water and oil recovery.更多还原