Flow parameter setting methods in numerical simulation of the unconventional reservoir and its impact on production

IF 1.6 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Bince Li, Fengpeng Lai, Guanglei Ren, Huachao Sun
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引用次数: 0

Abstract

Abstract Tight reservoirs have poor physical properties and complex pore structures, and well production is often affected by the starting threshold gradient, stress sensitivity, and water blockage. In this paper, the numerical simulation method is used to make these three factors equal. In addition, normalized influence coefficient analysis and grey relation analysis are used to investigate the degree of influence of each factor on well production. In this study, three methods are developed to set the threshold pressure gradient according to the permeability zoning, and the effect of reservoir heterogeneity is considered to set the threshold pressure gradient for unconventional reservoirs. The equivalent accuracy of the numerical simulation of the threshold pressure gradient can be improved compared to the traditional method. Stress sensitivity and water blockage effects are equated by correcting for rock compressibility coefficient and gas relative permeability. The fit rate of the gas well production history is improved by 2–3% after considering complex factors. The inclusion of the complex factors reduces the reservoir energy mobilization. The threshold pressure gradient results in an additional pressure reduction of about 1.8 MPa around the gas well. Residual gas identification and development is helped by clarifying the effect of complex factors on formation pressure When only the effect of a single factor is considered, water blockage has the most significant effect on gas well production, followed by threshold pressure and the weakest stress sensitivity. When several factors are considered together, the effect of stress sensitivity is increased.
非常规油藏数值模拟中流量参数的设置方法及其对生产的影响
致密储层物性差,孔隙结构复杂,井产量往往受到启动阈值梯度、应力敏感性和水堵塞等因素的影响。本文采用数值模拟的方法使这三个因素相等。此外,采用归一化影响系数分析和灰色关联分析,考察了各因素对油井产量的影响程度。根据渗透率分带,提出了3种设置阈值压力梯度的方法,并考虑了储层非均质性对非常规储层阈值压力梯度的影响。与传统方法相比,可以提高阈值压力梯度数值模拟的等效精度。通过校正岩石压缩系数和气体相对渗透率,将应力敏感性和水堵塞效应等同起来。考虑复杂因素后,气井生产历史拟合率提高了2-3%。复杂因素的加入降低了储层的能量动员。阈值压力梯度导致气井周围的额外压力降低约1.8 MPa。当只考虑单一因素影响时,水堵塞对气井生产的影响最大,其次是阈值压力,应力敏感性最弱。当多个因素同时考虑时,应力敏感性的影响会增强。
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来源期刊
Journal of Geophysics and Engineering
Journal of Geophysics and Engineering 工程技术-地球化学与地球物理
CiteScore
2.50
自引率
21.40%
发文量
87
审稿时长
4 months
期刊介绍: Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.
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