空气泡沫驱替中的渗流场变化特征

发布时间：2018-01-11 15:05

本文关键词：空气泡沫驱替中的渗流场变化特征　出处：《西安石油大学》2016年硕士论文　论文类型：学位论文

【摘要】：目前,我国大部分油田由于长期注水开发,已处于特高含水期,井底压力大幅下降,产量递减加快,有效提高油藏最终采收率面临巨大挑战。空气泡沫驱作为一种提高采收率的新方法,结合了空气驱油和泡沫驱油的双重优势,但是目前国内外关于注空气泡沫的室内实验、油藏数值模拟研究以及现场应用等鲜有公开报道,未形成相应的研究体系,并且空气泡沫驱油机理以及各种油藏的适用性等仍需进一步讨论。本文采用填砂管来模拟空气泡沫驱替中的渗流场变化,一共进行了两组不同渗透率下的空气泡沫驱油实验。结果表明,在低渗透管中,空气泡沫驱是水驱采收率的1.84倍,在中渗透管中,空气泡沫驱是水驱采收率的3.25倍。在空气泡沫驱替过程中压力变化范围很大,波动十分明显,分析认为是泡沫段塞封堵的缘故。本文还对室内实验进行了历史拟合及数值模拟分析,并将空气泡沫驱的渗流状态分为启动阶段、驱替阶段和突破阶段。分析认为,驱油的关键期是第二阶段:该阶段产液量和产油量增加迅速,氧气消耗迅速,地温稍有增加,产出端可检测到CO2和CO。在分析了空气泡沫驱的渗流变化特征之后,本文还运用了数值模拟来评价油藏参数、开发参数及工艺参数等因素对注空气泡沫驱油效果的影响,对注空气泡沫开发矿场试验具有一定指导作用。
[Abstract]:At present, most oil fields in our country have been in the high water cut period due to long-term waterflooding development, the bottom hole pressure has been greatly reduced, and the production decline has been accelerated. As a new method to improve oil recovery, air foam flooding combines the dual advantages of air flooding and foam flooding. However, at present, there are few public reports on the indoor experiments of air foam injection, reservoir numerical simulation and field application, and no corresponding research system has been formed at home and abroad. Furthermore, the mechanism of air foam flooding and the applicability of various reservoirs need further discussion. In this paper, sand pipe is used to simulate the change of percolation field in air foam flooding. Two groups of air foam flooding experiments were carried out under different permeability. The results show that in low permeability pipe, air foam flooding is 1.84 times as high as water flooding recovery, and it is in medium permeable pipe. Air foam flooding is 3.25 times as high as water flooding recovery. The pressure variation range is very large and the fluctuation is very obvious in the process of air foam displacement. It is believed that the plugging of foam slug is the result of the analysis. The paper also carries on the historical fitting and numerical simulation analysis to the laboratory experiment, and divides the seepage state of the air foam flooding into start-up stage. The analysis shows that the key period of oil displacement is the second stage: the liquid production and oil production increase rapidly, oxygen consumption is rapid, and the ground temperature is slightly increased. CO2 and CO. can be detected at the output end. After analyzing the percolation characteristics of air foam flooding, numerical simulation is also used to evaluate reservoir parameters. The influence of development parameters and process parameters on the oil displacement effect of air injection foam has a certain guiding effect on the field test of air injection foam development.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE357.46

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