MX区块缝洞型气藏应力敏感及水侵机理研究

发布时间：2018-06-12 07:35

本文选题：碳酸盐岩 + 缝洞型气藏　；参考：《西南石油大学》2015年硕士论文

【摘要】：国内外针对于碳酸盐岩缝洞型气藏应力敏感性及底水水侵机理的研究较少,且研究条件与实际气藏条件差距较大,缺乏必要的经验和理论依据。本文在国内外相关研究的基础上设计合理的实验方案,针对MX区块碳酸盐岩缝洞型气藏应力敏感及水侵机理以物理模拟为主、数值模拟为辅的方法进行了研究。本次研究建立了实际地层温度压力条件下渗透率应力敏感测试方法,模拟实际气藏开采过程,进行了6组不同渗透率级别缝洞型岩心应力敏感性测试。针对垂直连通底水缝洞型储层,开展3种不同水体大小、2种不同衰竭速度底水水侵实验。最后建立底水缝洞型气藏单井数值模拟模型,分析不同水体大小、不同水体能量、应力敏感性等对底水气藏开发效果的影响。本文研究取得主要成果如下： (1)6块缝洞型全直径岩心均具有较强的应力敏感性,应力敏感不可逆渗透率损失率在30%左右；缝洞型岩心应力敏感程度与岩心孔隙度相关性不大,与岩心渗透率具有较好的相关性；常规应力敏感测试结果与高温高压地层条件应力敏感测试结果具有一定的差异；(2)底水水体越大,衰竭速度越快,见水时间越早,产气量越低,水气比升高越快,气藏采出程度越低；(3)底水层存在大裂缝沟通时：水体越大、水体能量越强,累产气量越小,稳产性越差,水气比上升越快；储层强应力敏感影响下,累产气量降低,稳产性变差,水气比变化不大。研究成果为缝洞型气藏开发开采具有指导意义。
[Abstract]:At home and abroad, there are few researches on stress sensitivity and bottom water invasion mechanism of fractured and cavernous carbonate gas reservoirs, and there is a big gap between the research conditions and the actual gas reservoir conditions, which is lack of necessary experience and theoretical basis. On the basis of relevant research at home and abroad, a reasonable experimental scheme is designed in this paper. The stress sensitivity and water invasion mechanism of carbonate fracture-cavernous gas reservoirs in MX block are studied mainly by physical simulation and supplemented by numerical simulation. In this study, a method for testing permeability stress sensitivity under actual formation temperature and pressure conditions is established, and six groups of fracture-cavity core stress sensitivity tests with different permeability levels are carried out to simulate the actual gas reservoir production process. In view of vertically connected bottom water fracture-cavern reservoir, three kinds of water bodies of different sizes and two kinds of different failure velocity bottom water invasion experiments were carried out. Finally, a numerical simulation model of single well for bottom water fracture-cavity gas reservoir is established to analyze different water body sizes and water energy. The main results obtained in this paper are as follows: the core with full diameter of fracture and cavern type in block No.1 has strong stress sensitivity, and the loss rate of stress-sensitive irreversible permeability is about 30%; The stress sensitivity of the fracture-cavity core is not related to the porosity of the core, but to the permeability of the core. There is a certain difference between the conventional stress sensitivity test results and the high temperature and high pressure formation stress sensitivity test results.) the larger the bottom water body is, the faster the failure rate is, the earlier the water appears, the lower the gas production is, and the faster the water / gas ratio increases. The lower the recovery degree of gas reservoir is, the lower the bottom water layer is when there are large fractures: the larger the water body, the stronger the water energy, the smaller the cumulative gas production, the worse the stable production, the faster the water-gas ratio rises, the lower the cumulative gas production is under the influence of the strong stress sensitivity of the reservoir. The stable production becomes worse and the ratio of water to gas does not change much. The research results are of guiding significance for the development and production of fractured and cavernous gas reservoirs.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358

【参考文献】