复杂储层压裂井不稳定渗流模型与试井分析方法研究

发布时间：2018-10-08 13:24

【摘要】：地下油气渗流理论是开发的基础,试井分析技术可为储层合理高效开发提供技术支持。许多的多层致密砂岩储层、缝洞性碳酸盐岩储层、煤层气储层等复杂储层多采用压裂后开采,针对这些储层压裂井生产引发的一系列渗流问题,开展了不稳定渗流理论模型与试井分析方法研究。按照不同储层类型的特点,建立并求解了一系列压裂井渗流模型,绘制了典型的试井分析样版曲线,研究了渗流流动阶段,并分析了各模型参数对试井样版曲线的敏感性特征。研究的模型主要有：(1)4个多层储层压裂井不稳定渗流模型(多层合压无限导流垂直裂缝井模型；多层合压有限导流垂直裂缝井模型；多层分层压裂无限导流垂直裂缝井模型和多层分层压裂有限导流垂直裂缝井模型),着重分析了裂缝导流能力、裂缝表皮、层间储容系数、层间流动系数等参数对样版曲线的敏感性特征；(2)3类多重介质储层的5个压裂井不稳定渗流模型(裂缝型储层拟稳态窜流模型；裂缝型储层非稳态窜流模型；孔洞型储层模型；裂缝孔洞型储层拟稳态窜流模型；裂缝孔洞型储层非稳态窜流模型),着重分析了窜流系数、储容系数等参数对样版曲线的敏感性特征；(3)4类非均质复合储层的9个压裂井不稳定渗流模型(多层合压复合模型、多层分层压裂复合模型、分别考虑拟稳态窜流和非稳态窜流的裂缝型复合储层模型、孔洞型复合储层模型和分别考虑拟稳态窜流和非稳态窜流的裂缝孔洞型复合储层模型),着重研究了复合半径、各区流度比、各区导压系数比等参数对样版曲线的敏感性特征；(4)2个煤层气压裂井不稳定渗流模型(基质煤层气拟稳态扩散模型和非稳态扩散模型),着重研究了天然割理储容系数、基质向天然割理窜流系数和吸附系数等参数对样版曲线的敏感性特征。最后,通过不同储层类型的现场实例拟合解释,获得了有用的储层参数。研究成果可开发成专业的试井分析软件推广到现场应用,为油气田开发生产服务。研究成果还可为国内外同类型的复杂储层压裂井渗流理论与应用研究提供参考和指导。
[Abstract]:The theory of underground oil and gas percolation is the basis of development. Well test analysis technology can provide technical support for rational and efficient development of reservoir. Many complex reservoirs, such as multi-layer tight sandstone reservoirs, fracture-cavernous carbonate rock reservoirs and coalbed methane reservoirs, are exploited after fracturing. In view of a series of percolation problems caused by the production of fracturing wells in these reservoirs, The theoretical model and well test analysis method of unstable seepage flow are studied. According to the characteristics of different reservoir types, a series of fracturing well percolation models are established and solved, typical well test analysis pattern curves are drawn, the seepage flow stage is studied, and the sensitivity characteristics of model parameters to well test pattern curves are analyzed. The main research models are as follows: (1) four unsteady percolation models of multi-layer reservoir fracturing wells (multi-layer pressure infinite diversion vertical fracture well model, multi-layer pressure finite flow diversion vertical fracture well model; This paper analyzes the fracture conductivity, the fracture skin, the interlayer storage coefficient, and the multi-layer fracturing model with infinite diversion vertical fracture well model and multi-layer stratified fracturing finite flow diversion vertical fracture well model with emphasis on the analysis of fracture conductivity, fracture epidermis and interlayer storage capacity coefficient. The sensitivity of parameters such as interlayer flow coefficient to the sample curve; (2) five unstable percolation models of fracturing wells (pseudo-steady flow model for fractured reservoir; unsteady channeling model for fractured reservoir; porosity reservoir model; In this paper, the quasi-steady flow model of fractured porosity reservoir and the unsteady flow model of fractured pore type reservoir are discussed. The sensitivity of the parameters such as channeling coefficient, storage and volume coefficient to the sample curve is analyzed. (3) 9 fracturing well unstable percolation models (multilayer pressure composite model, multilayer stratified fracturing composite model) of 4 kinds of heterogeneous composite reservoirs, which consider the fractured composite reservoir model of pseudo-steady state channeling flow and unsteady state channeling flow, respectively. In this paper, the sensitivity characteristics of the parameters of composite radius, mobility ratio and pressure conductivity ratio to the curve of sample plate are studied in detail, including the model of porous composite reservoir and the model of fracture pore type complex reservoir considering pseudo-steady flow and unsteady channeling, respectively, and the characteristics of sensitivity of the parameters such as composite radius, mobility ratio of each region and ratio of pressure conductivity coefficient of each district to the sample plate curve. (4) two unsteady percolation models of coalbed gas fracturing wells (matrix coalbed methane quasi-steady diffusion model and unsteady diffusion model). The sensitivity of matrix to natural cleavage flow coefficient and adsorption coefficient to the curve of sample plate. Finally, some useful reservoir parameters are obtained by field simulation and interpretation of different reservoir types. The research results can be developed into a professional well test analysis software to be applied in the field and serve the development and production of oil and gas fields. The research results can also provide reference and guidance for the study of percolation theory and application of the same type of complex reservoir fracturing wells at home and abroad.
【学位授予单位】：西南石油大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TE312
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本文编号：2256916