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以前对底水驱油藏水平井应用研究通常假定在预测井的性能时井内没有压力损失,除了在低速生产条件以外。这种假定会过高估计采油量。因此,假定的结果不是最后结果。由于水平井是高耗费技术,因此应用这一技术的油藏开发方案要求对泄油面积和生产速度进行优化。真正的挑战,即目前研究的主要目的是研究泄流面积和生产速度对采收率的影响。此次研究工作应用了一种半经验方法。这一方法已成功有效地应用于现场数据。同时也被用于评价井眼深度、井眼位置和油藏非均质性对生产动态的影响。获得的结果表明,对于同样井深和生产速度,随着井的泄流面积增加采收率降低,也表明通过提高产量;尽管缩短了无水期;但采油速度得到提高。利用这一结果、通过提高生产速度和水平井水平段长度,可以克服大的井间距而达到短生产周期的高采收率。这些发现以前从未报道过。据从油藏开发的经济观点来看是重要的。结果也证明,使用井段水平可获得高采收率。油藏井眼位置对采收率的影响及其它结果将详细论述。本文的最终目的是提供给工程师们应用水平井底水驱油藏开发的优化战略思想,同时也清楚地提出了对生产动态进行预测的一个简单处理过程。
Previous research into horizontal wells in bottom-water drive reservoirs has generally assumed that there is no pressure loss in the well when predicting well performance, except at low-speed production conditions. This assumption will overestimate the amount of oil production. Therefore, the assumed result is not the final result. Because horizontal wells are costly technologies, reservoir development programs that apply this technology require optimization of drainage area and production speed. The real challenge is that the main purpose of the current study is to study the effect of discharge area and production rate on recovery. The research work applied a semi-empirical method. This method has been successfully applied effectively to field data. It is also used to evaluate the impact of wellbore depth, wellbore location and reservoir heterogeneity on production dynamics. The results obtained show that for the same well depth and production rate, the oil recovery decreases with increasing well discharge area, which also indicates an increase in production, although the water-free period is shortened; however, the rate of oil production is increased. Using this result, high recovery in short production cycles can be achieved by overcoming large well spacing by increasing production rates and horizontal well horizontal section lengths. These findings have never been reported before. It is important from an economic point of view of reservoir development. The results also demonstrate that high recovery can be achieved using well section levels. The effect of wellbore location on oil recovery and other results will be discussed in detail. The ultimate goal of this paper is to provide engineers with an optimization strategy for the development of horizontal bottom-hole waterflooding reservoirs and a clear process for predicting production dynamics.