基于压力产量耦合的致密气藏动态分析新方法

发布时间：2018-06-18 04:21

本文选题：致密气藏 + 动态分析　；参考：《天然气工业》2016年08期

【摘要】：对于致密气藏而言,常规的Arps分析方法受到应用条件的限制,不适用于该类气藏。为此,考虑生产过程中气体PVT随压力变化和变流压生产的情况,提出了一种基于产量和压力相耦合的动态分析新方法。其步骤为:(1)根据产量和压力历史数据计算出拟压力标准化产量;(2)基于产量历史计算出物质平衡时间;(3)根据拟压力标准化产量和物质平衡时间得出标准化递减率;(4)由拟压力标准化递减率进一步计算出标准化递减指数。通过理论分析发现:(1)拟压力标准化的递减率与物质平衡时间呈幂指数关系;(2)由标准化递减指数的变化规律可以得出致密气藏气井的流动存在井筒储集及裂缝线性流(n=1左右)、线性流到拟径向流的过渡流(1n2)、拟径向流向边界控制流的过渡流(0.5n2.0)、边界控制流(n0.5)等4个阶段。实例应用结果表明,分析结果与理论结果符合程度高,能够提高递减规律预测的准确性,表明新方法适用于致密气藏的动态分析,可为致密气藏开发提供可靠的分析手段。
[Abstract]:For the tight gas reservoir, the conventional Arps analysis method is limited by the application conditions and is not suitable for this kind of gas reservoir. In this paper, a new dynamic analysis method based on the coupling of output and pressure is proposed considering the change of gas PVT with pressure and variable flow pressure in the production process. Its steps are: (1) calculate the quasi pressure standardized yield according to the production and pressure historical data, calculate the material equilibrium time based on the production history, calculate the material balance time (3) get the standardized decline rate according to the quasi pressure standardized output and material equilibrium time. The standardized decline index is further calculated from the quasi-pressure standardized decline rate. Through theoretical analysis, it is found that the decline rate of quasi-pressure standardization is a power exponent relationship with material balance time. (2) from the variation law of standardized decline index, it can be concluded that the flow of gas wells in tight gas reservoirs has wellbore reservoir and fracture linearity. There are four stages: the transition flow from linear flow to quasi-radial flow, the transition flow from quasi-radial flow to quasi-radial flow, the transition flow from quasi-radial flow to boundary control flow, and the transition flow from boundary control flow to boundary control flow. The results of practical application show that the analytical results are in good agreement with the theoretical results and can improve the accuracy of prediction of decline law. It shows that the new method is suitable for the dynamic analysis of tight gas reservoirs and can provide a reliable analytical means for the development of dense gas reservoirs.
【作者单位】： "油气藏地质及开发工程"国家重点实验室·西南石油大学;低渗透油气田勘探开发国家工程实验室;中国石油长庆油田公司气田开发处;
【基金】：中国石油天然气股份有限公司科学研究与技术开发项目“长庆气田稳产及提高采收率技术研究”(编号:2011E-1306) 国家自然科学基金项目“缝洞性碳酸盐岩多段酸压水平井压力动态研究”(编号:51304164) 霍英东教育基金会高等院校青年教师基金项目“深层裂缝性致密油气藏复杂非线性渗流模型及非稳定态渗流特征研究”(编号:151050)
【分类号】：TE332

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