水平井蒸汽流动与传热规律研究

发布时间：2018-10-04 19:08

【摘要】：稠油作为一种非常规原油资源对我国经济的发展起着至关重要的作用,现阶段水平井注蒸汽开采是我国稠油开采的重要方式,其开采效果很大程度上取决于井底的蒸汽品质,以及蒸汽在油层中的扩散情况。因而对蒸汽在水平井流动和传热问题进行研究具有重大实际意义。在本文的研究中,建立了蒸汽在竖直井筒流动传热模型,并用数值方法进行求解,编制了计算程序,得到蒸汽热力参数沿井筒的分布规律,并进行了注汽参数敏感性分析和注汽时间对井底蒸汽参数影响分析。在考虑注汽筛管径向分流的基础上,建立了蒸汽在水平井筒内的流动传热模型,模型中考虑了注汽孔引起的孔眼摩阻损失,结合储层物性与蒸汽压力确定注汽孔泄流大小。对模型求解得到水平井筒蒸汽参数分布,发现提高注汽速率和干度可以有效提高水平井趾部蒸汽干度。研究发现现有管柱存在蒸汽分配不均,进而提出了注汽管柱的优化方法,优化了注汽筛管的开孔密度,实现水平井底蒸汽等质量分配。
[Abstract]:As a kind of unconventional crude oil resource, heavy oil plays a vital role in the development of our economy. At present, horizontal well steam injection production is an important way of heavy oil production in China, and its recovery effect largely depends on the steam quality at the bottom of the well. And the diffusion of steam in the reservoir. Therefore, it is of great practical significance to study the flow and heat transfer of steam in horizontal wells. In this paper, the heat transfer model of steam flow in vertical shaft is established, and the numerical method is used to solve it. The calculation program is compiled, and the distribution law of steam thermodynamic parameters along the shaft is obtained. The sensitivity of steam injection parameters and the effect of steam injection time on bottom steam parameters are analyzed. On the basis of considering radial distribution of steam injection sieve pipe, the flow heat transfer model of steam in horizontal well tube is established. The pore friction loss caused by steam injection hole is considered in the model, and the leakage size of steam injection hole is determined by combining reservoir physical property with steam pressure. The distribution of steam parameters in horizontal wellbore is obtained by solving the model. It is found that increasing steam injection rate and dryness can effectively increase the steam dryness of toe in horizontal well. It is found that the steam distribution is uneven in the existing pipe string, and then the optimization method of steam injection string is put forward, the open hole density of steam injection sieve pipe is optimized, and the mass distribution of steam at the bottom of horizontal well is realized.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.44

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