X火山岩凝析气藏气井产能评价研究

发布时间：2018-08-27 16:52

【摘要】：火山岩气藏作为我国新崛起的油气资源,其储量规模大,开发前景广阔。与常规气藏相比,火山岩气藏储层的孔、洞、缝发育,储层基质物性差、渗流机理复杂,目前尚缺乏适合火山岩气藏的多相渗流数学模型和产能计算方法。本文以X火山岩气藏为研究对象,开展火山岩气藏储层的非线性渗流机理研究,考虑其反凝析及产水特征,建立了火山岩气藏的非线性渗流数学模型及产能计算公式。本文在调研凝析气井产能及压裂井产能研究现状的基础上,结合X火山岩气藏基本地质、开发特征,研究了气藏渗流机理,建立了在储层内考虑应力敏感效应和启动压力梯度、裂缝内考虑高速紊流效应和应力敏感效应的油气两相和气水两相渗流模型;在此基础上,引入椭圆坐标及两相拟压力函数,建立了火山岩气藏压裂直井油气两相及气水两相产能计算模型;运用多井干扰势的叠加原理以及当量井径模型,建立了火山岩气藏压裂水平井油气两相及气水两相产能计算模型；结合X火山岩气藏典型压裂井的相关物性参数、生产数据及试井分析资料,对典型井进行了产能评价研究,同时对产能影响因素进行了分析；采用经验法、采气曲线法、临界携液流量法和节点分析法对气井的合理配产进行了研究。本文的研究成果对低渗透火山岩气藏压裂直井和压裂水平井的产能预测以及合理配产研究具有一定的参考意义,为该类气藏气井产能的计算提供了方法依据。
[Abstract]:As a newly rising oil and gas resource in China, volcanic gas reservoir has a large scale of reserves and broad prospect of development. Compared with conventional gas reservoirs, the porosity, cavity, fracture development of volcanic gas reservoir, reservoir matrix physical property is poor, percolation mechanism is complex, and there is still a lack of mathematical model and productivity calculation method of multi-phase seepage suitable for volcanic gas reservoir at present. In this paper, taking the X volcanic gas reservoir as the research object, the nonlinear seepage mechanism of the volcanic gas reservoir is studied, and the mathematical model of nonlinear seepage flow and the formula of productivity calculation of the volcanic rock gas reservoir are established considering its reverse condensate and water production characteristics. On the basis of investigating the present research situation of condensate gas well productivity and fracturing well productivity, combined with the basic geology and development characteristics of X volcanic gas reservoir, the percolation mechanism of gas reservoir is studied, and the stress sensitivity effect and starting pressure gradient are considered in the reservoir. In this paper, a two-phase and gas-water seepage model with high velocity turbulence and stress sensitive effect is proposed, and the elliptical coordinate and two-phase pseudo-pressure function are introduced on the basis of the model. A calculation model of two-phase and gas-water two-phase productivity for fracturing straight wells in volcanic gas reservoirs is established, and the superposition principle of multi-well interference potential and equivalent well diameter model are used. In this paper, a model for calculating the productivity of fractured horizontal wells and gas-water phases in volcanic gas reservoirs is established, and the productivity evaluation of typical wells in X volcanic gas reservoir is studied by combining the relevant physical parameters, production data and well test analysis data of typical fracturing wells in X volcanic gas reservoir. At the same time, the factors affecting productivity are analyzed, and the rational production of gas wells is studied by means of empirical method, gas recovery curve method, critical liquid carrying flow method and nodal analysis method. The research results in this paper have certain reference significance for the prediction of productivity of fracturing straight wells and fracturing horizontal wells in low permeability volcanic gas reservoirs and the study of reasonable production distribution, and provide a method basis for the calculation of gas well productivity in this kind of gas reservoirs.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE372

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