页岩气井产量预测理论模型研究及软件研制

发布时间：2019-04-26 03:29

【摘要】：页岩气等非常规能源目前已成为全球油气资源开发的焦点,近年来,页岩气开发进入了高速发展阶段。然现阶段国内外对于页岩气藏渗流机理及页岩气井产量预测的研究尚存在不足,较难准确预测页岩气井产量递减规律。本文在大量调研国内外文献的基础之上,提出了更适用于页岩气多段压裂水平井的产量递减分析方法,研制了页岩气多段压裂水平井产能预测及生产动态分析软件,为页岩气的开发提供了理论依据。本文的主要研究内容如下： (1)基于文献调研的成果,分析页岩气微观孔隙结构及储集、渗流特征,了解其产出及运移机理。 (2)考虑页岩基质中同时存在渗流、扩散以及吸附气解吸,建立无限大页岩储层的基本渗流模型,在拟稳态及非稳态条件下分别推导页岩气藏系统综合渗流微分方程。 (3)基于对页岩气赋存、流动机理及微地震监测的分析和认识,将页岩气藏多段压裂水平井简化为五线性流渗流物理模型。利用渗流力学方法,建立考虑页岩气吸附／解吸和非稳态扩散效应的压裂水平井双重介质五线性流数学模型,运用拉普拉斯变换对数学模型进行求解并绘制无因次产量变化曲线,分析各敏感性参数对产量变化的影响。 (4)通过对产量变化曲线特征的分析,获得模型在双线性流和线性流阶段的实空间渐进解,并建立了线性流与双线性流阶段对生产数据的分析方法。 (5)基于理论研究成果,利用VS2008研制页岩气多段压裂水平井产能预测及生产动态分析软件。针对气井的产量预测,将所研制的软件与商业软件进行对比以验证模型的可靠性。利用所研制的软件,对页岩气生产过程的控制因素进行研究,并对实际的多段压裂水平井生产数据进行分析,获取水平井压裂及页岩储层相关参数。结果表明本所建立的五线性流模型及所研制的软件能够适用于页岩气多段压裂水平井的产能预测及生态动态分析。
[Abstract]:Shale gas and other unconventional energy sources have become the focus of global oil and gas resources development. In recent years, shale gas development has entered a high-speed development stage. However, at present, the study on the mechanism of shale gas reservoir seepage and the prediction of shale gas well production is still insufficient, so it is difficult to accurately predict the law of shale gas well production decline. On the basis of a large number of domestic and foreign literatures, this paper puts forward a production decline analysis method which is more suitable for horizontal wells of shale gas multi-section fracturing, and develops the software of productivity prediction and production performance analysis for horizontal wells of shale gas multi-section fracturing. It provides a theoretical basis for the development of shale gas. The main contents of this paper are as follows: (1) based on the results of literature investigation, the micro-pore structure, reservoir and seepage characteristics of shale gas are analyzed, and the occurrence and migration mechanism of shale gas are understood. (2) considering the simultaneous existence of seepage, diffusion and adsorption gas desorption in shale matrix, the basic percolation model of infinite shale reservoir is established, and the differential equations of comprehensive seepage flow in shale gas reservoir system are derived under the conditions of pseudo-steady state and unsteady state respectively. (3) based on the analysis and understanding of shale gas occurrence, flow mechanism and micro-seismic monitoring, the multi-stage fracturing horizontal well in shale gas reservoir is simplified to a five-linear flow physical model. By means of seepage mechanics, a mathematical model of dual medium five linear flow in fractured horizontal wells considering the adsorption / desorption and unsteady diffusion effects of shale gas is established. Laplace transform was used to solve the mathematical model and draw the dimensionless curve of yield change, and analyze the influence of the sensitivity parameters on the yield change. (4) by analyzing the characteristics of production curve, the real-space progressive solutions of the model in bilinear and linear flow stages are obtained, and the analytical methods of production data in linear flow and bilinear flow stages are established. (5) based on the theoretical research results, the software of productivity prediction and production performance analysis of shale gas multi-section fracturing horizontal well is developed by using VS2008. In order to verify the reliability of the model, the developed software is compared with commercial software in order to predict the production of gas well. By using the developed software, the controlling factors of shale gas production process are studied, and the actual production data of multi-stage fracturing horizontal wells are analyzed, and the relevant parameters of horizontal well fracturing and shale reservoir are obtained. The results show that the five-linear flow model and the developed software can be used for productivity prediction and ecological dynamic analysis of shale gas multi-section fracturing horizontal wells.
【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】：TE328

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