分层压裂气井产能分析

发布时间：2018-03-02 18:49

本文选题：分层压裂　切入点：气井　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：天然气具有清洁、环保、高效等特点,随着社会对环境保护要求的提高,天然气的需求量越来越大。从全球范围来看,天然气资源储量要远大于石油,这为发展天然气事业提供了足够的资源保障。在全球追寻低碳、绿色发展的时代,天然气将逐步成为一次能源结构中最为重要、不可替代的清洁能源。我国的天然气储量丰富,但是目前开发的气藏类型较为复杂,其中致密气藏占有相当大的比例,由于其岩层致密,非均质性严重,开采难度非常大。出于良好利用储层能量的考虑,最为行之有效的增产方法就是水力压裂。但是当代试井分析对分层压裂气井试井分析的方法并不是很多也不够全面和成熟。研究分层压裂气井的产能分析,有助于对多层合采气井做出切合实际的分析和解释,有助于选择合理的生产压差,对注采井进行合理的配产配注,对现场多层油田开发具有重要的指导意义。本文通过分解一维不稳定渗流数学模型、应用极限理论和Laplace变换方法推演了一维无界地层的Green函数；通过Newmann乘积方法得到了多维地层中的Green函数。求解了矩形地层中一口偏心直井的不稳定压力分布,展示了Green函数方法的应用环节,通过渐近分析得到了晚期拟稳态压力函数近似式和流量函数近似式。本文通过求解无限延伸储层中心一口有限导流垂直裂缝井的不稳态渗流问题,展示了汇点积分方法、渐近分析过程以及有限导流影响等具体处理细节,通过分析对比说明了本文方法的正确性。然后通过汇点积分方法建立了单层有限导流垂直裂缝井模型,并得到不稳定渗流压力分布函数以及流量递减函数,通过单参数分析计算说明了井壁压力变化的主要特征以及流量递减特征。本文通过演绎褶积定理给出了多层合采井的产能分析基础,再通过各种积分变换方法给出了多层圆形储层、多层矩形储层分层压裂条件下的不稳定渗流数学模型解析解,最后形成了产能分析计算方法。采用VC++6.0语言,编制了基础数据输入、曲线作图、结果数据输出等模块,可以方便分析计算。
[Abstract]:Natural gas has the characteristics of cleanliness, environmental protection and high efficiency. With the increasing demands of society for environmental protection, the demand for natural gas is increasing. From a global perspective, the reserves of natural gas are much larger than those of oil. In the era of global pursuit of low-carbon and green development, natural gas will gradually become the most important and irreplaceable clean energy in the primary energy structure. China is rich in natural gas reserves. However, the types of gas reservoirs developed at present are quite complex, among which tight gas reservoirs account for a large proportion. Due to their tight rock formations, serious heterogeneity, and very difficult to exploit, it is very difficult for them to make good use of reservoir energy. The most effective way to increase production is hydraulic fracturing. However, there are not many and not enough comprehensive and mature methods in modern well testing analysis for gas well testing in stratified fracturing. The productivity analysis of gas wells in stratified fracturing is studied. It is helpful to make practical analysis and interpretation of multi-layer combined production gas wells, to select reasonable production pressure difference, and to carry out rational production and distribution of injection-production wells. This paper deduces the Green function of one-dimensional unbounded formation by decomposing the one-dimensional unstable seepage mathematical model and applying the limit theory and Laplace transform method. The Green function in multidimensional formation is obtained by Newmann product method, the unstable pressure distribution of an eccentric straight well in rectangular formation is solved, and the application of Green function method is demonstrated. By asymptotic analysis, the approximate equations of pressure function and flow function of late quasi steady state are obtained. In this paper, the unsteady seepage problem of a finite diversion vertical fracture well in the center of infinite extended reservoir is solved, and the method of meeting point integral is presented. The asymptotic analysis process and the influence of finite conductivity are discussed in detail, and the correctness of the method is proved by comparison, and then the single-layer finite conductivity vertical fracture well model is established by the method of meeting point integration. The pressure distribution function and flow decline function of unstable seepage flow are obtained. Through single parameter analysis and calculation, the main characteristics of wellbore pressure change and the characteristics of flow decline are explained. In this paper, the basis of productivity analysis for multilayer production wells is given by deductive convolution theorem. The analytical solution of unstable percolation mathematical model of multi-layer circular reservoir and multi-layer rectangular reservoir under the condition of stratified fracturing is given through various integral transformation methods. Finally, the method of productivity analysis and calculation is formed. The basic data input, curve drawing and result data output module are worked out, which can be easily analyzed and calculated.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE328

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