Modeling Transient Flow Behavior of Off-Center Fractured Well with Multiple Fractures in Radial Composite Gas Reservoirs

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
You-jie Xu, Xiang Zuping, Mengnan Yu
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引用次数: 0

Abstract

Vertical hydraulic fracturing is widely used to develop low-permeability gas reservoirs. Uneven distribution of formation permeability and stress leads to multiple-wing hydraulic fractures with different lengths, which results in the wellbore not being the center of the circular stimulated reservoir volume (SRV) region. Therefore, to simulate the wellbore pressure of this phenomenon, a semianalytical model of the off-center multiwing fractured well in radial composite gas reservoirs is presented and the corresponding solution method is shown. The model is verified with the numerical solution, and eight flow regimes can be distinguished under the ideal case, which includes bilinear flow, fracture interference, linear flow, radial flow of inner region, transition flow of inner region, and radial flow of inner region. Compared with the previous model in which the well is at the center of radial composite gas reservoirs, in this paper we present an obvious “step” after the inner region radial flow regime, which is related to the off-center distance and radius of the inner region. In addition, the effects of some important parameters (such as off-center distance, permeability mobility, inner region radius, and fracture distribution) on typical curves are discussed. Finally, field well testing data are used to verify the accuracy of the model.
径向复合气藏多裂缝离心压裂井瞬态流动特性建模
垂向水力压裂在低渗透气藏开发中应用广泛。由于地层渗透率和应力分布不均匀,导致存在长度不同的多翼水力裂缝,导致井筒不在SRV区域的中心位置。为此,为了模拟这种现象的井筒压力,建立了径向复合气藏多翼裂缝井偏心半解析模型,并给出了求解方法。通过数值解对模型进行了验证,在理想情况下可区分出双线性流动、裂缝干涉流动、线性流动、内区径向流动、内区过渡流动和内区径向流动等8种流动形式。与以往的井位于径向复合气藏中心的模型相比,本文在内区径向流态之后出现了明显的“台阶”,这与内区离中心距离和半径有关。此外,还讨论了一些重要参数(如离中心距离、渗透率迁移率、内区半径和裂缝分布)对典型曲线的影响。最后,利用现场试井数据验证了模型的准确性。
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来源期刊
CiteScore
5.30
自引率
0.00%
发文量
68
审稿时长
12 months
期刊介绍: Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.
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