致密气藏多级压裂水平井试井方法研究及软件研制

发布时间：2018-04-27 17:58

本文选题：致密气藏 + 压裂水平井　；参考：《西南石油大学》2017年硕士论文

【摘要】：致密气藏是指赋存于低孔隙度和低渗透率介质的低渗天然气藏,属于非常规油气藏。近几年来,由于致密气藏储层岩石渗透率低、自然产能较小、开发难度较大,多级压裂水平井技术已成为开发致密气藏的重要技术手段。目前国内针对致密气藏多级压裂水平井的研究,很少将裂缝变导流能力、非达西效应综合考虑到渗流模型中。本文以致密气藏储层特征及试井分析为研究对象,运用现代渗流理论、试井方法、数学物理方法、计算机编程等知识,建立并求解了单重介质、双重介质致密气藏考虑裂缝变导流能力多级压裂水平井渗流模型,研制了致密气藏多级压裂水平井试井解释软件,分析了致密气藏开发过程中压裂水平井压力动态变化,为致密气藏试井分析提供了理论指导。本文主要完成以下工作:(1)建立了单重介质考虑裂缝变导流能力、非达西效应的单裂缝水平井模型,采用数值离散裂缝的半解析法求解数学模型,绘制了井底压力响应曲线,分析了无因次导流系数对压力响应曲线的影响,为致密气藏多级压裂水平井试井模型的建立提供理论基础。(2)建立了单重介质致密气藏裂缝变导流能力多级压裂水平井渗流数学模型,采用数值离散裂缝的半解析法求解数学模型,绘制了井底压力响应曲线,对特征曲线进行了流动阶段划分,分析了井筒储集系数、表皮系数、裂缝间距、裂缝条数、无因次导流系数对压力响应曲线的影响。(3)建立了双重介质考虑介质间发生拟稳态、非稳态窜流的致密气藏裂缝变导流能力多级压裂水平井渗流数学模型,采用数值离散裂缝的半解析法求解数学模型,绘制了井底压力响应曲线,对特征曲线进行了流动阶段划分,分析了弹性储容比、窜流系数、无因次导流系数对压力响应曲线的影响。(4)基于现代试井分析方法,采用C#语言计算机语言,在Windows系统应用程序开发环境Visual Studio平台下进行开发,研制了致密气藏多级压裂水平井试井解释软件。(5)基于研制的软件,运用建立的模型对实测数据进行试井解释分析,验证了本文理论模型的实用性。
[Abstract]:Tight gas reservoir is a gas reservoir with low permeability and low porosity, which belongs to unconventional reservoir. In recent years, because of the low rock permeability, low natural productivity and great difficulty in development of tight gas reservoir, multistage fracturing horizontal well technology has become an important technical means to develop tight gas reservoir. At present, according to the research of multistage fracturing horizontal wells in dense gas reservoirs, it is rare to consider the fracture changing conductivity and non-Darcy effect into the seepage model. In this paper, the characteristics of tight gas reservoir and well test analysis are taken as the research object. Using modern percolation theory, well test method, mathematical and physical method, computer programming and so on, a single medium is established and solved. In this paper, a multistage fractured horizontal well percolation model for dense gas reservoirs with dual medium and variable conductivity is developed, and the well test interpretation software is developed, and the pressure dynamic change of fractured horizontal wells during the development of dense gas reservoirs is analyzed. It provides theoretical guidance for well test analysis of tight gas reservoirs. The main work of this paper is as follows: (1) A single fracture horizontal well model considering the variable conductivity of fracture and non-Darcy effect in single medium is established. The mathematical model is solved by using the semi-analytical method of numerical discrete fractures, and the bottom hole pressure response curve is drawn. The influence of dimensionless conductivity on pressure response curve is analyzed. This paper provides a theoretical basis for the establishment of multistage fracturing horizontal well test model in dense gas reservoirs. (2) A mathematical model of permeability of multistage fracturing horizontal wells in dense gas reservoirs with single and heavy medium is established. The mathematical model is solved by semi-analytical method of numerical discrete fracture. The response curve of bottom hole pressure is drawn. The characteristic curve is divided into flow stages, and the wellbore reservoir coefficient, skin coefficient, fracture spacing and fracture number are analyzed. The influence of dimensionless conductivity on the pressure response curve. (3) A mathematical model of multistage fracturing horizontal well percolation in a tight gas reservoir with fractured and variable conductivity considering the occurrence of quasi-steady-state and unsteady-state channeling between two media is established. The semi-analytical method of numerical discrete fracture is used to solve the mathematical model, the bottom hole pressure response curve is drawn, the characteristic curve is divided into flow stages, and the elastic storage capacity ratio and channeling coefficient are analyzed. The influence of dimensionless conductivity on the pressure response curve.) based on the modern well test analysis method, using the computer language of C #, the development of Windows system application program development environment Visual Studio is carried out. Based on the developed software, the established model is used to interpret and analyze the measured data, which verifies the practicability of the theoretical model in this paper.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE377

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