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首页> 外文期刊>Journal of geophysics and engineering >New modelling of transient well test and rate decline analysis for a horizontal well in a multiple-zone reservoir
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New modelling of transient well test and rate decline analysis for a horizontal well in a multiple-zone reservoir

机译：多区油藏水平井瞬态试井及速率下降分析的新模型

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摘要

The no-type curve with negative skin of a horizontal well has been found in the current research. Negative skin is very significant to transient well test and rate decline analysis. This paper first presents the negative skin problem where the type curves with negative skin of a horizontal well are oscillatory. In order to solve the problem, we propose a new model of transient well test and rate decline analysis for a horizontal well in a multiple-zone composite reservoir. A new dimensionless definition of r_D is introduced in the dimensionless mathematical modelling under different boundaries. The model is solved using the Laplace transform and separation of variables techniques. In Laplace space, the solutions for both constant rate production and constant wellbore pressure production are expressed in a unified formula. We provide graphs and thorough analysis of the new standard type curves for both well test and rate decline analysis; the characteristics of type curves are the reflections of horizontal well production in a multiple-zone reservoir. An important contribution of our paper is that our model removed the oscillation in type curves and thus solved the negative skin problem. We also show that the characteristics of type curves depend heavily on the properties of different zones, skin factor, well length, formation thickness, etc. Our research can be applied to a real case study.
机译：在当前的研究中已经发现了水平井表皮为负的无型曲线。阴性皮肤对瞬态试井和速率下降分析非常重要。本文首先提出负趋肤问题，其中水平井的负趋肤类型曲线是振荡的。为了解决该问题，我们提出了一种多区域复合储层水平井的瞬态试井和速率下降分析的新模型。在不同边界下的无量纲数学建模中引入了r_D的新无量纲定义。该模型使用拉普拉斯变换和变量分离技术求解。在拉普拉斯空间中，恒定速率生产和恒定井筒压力生产的解决方案用统一的公式表示。我们提供图表和对新标准曲线的全面分析，以进行试井和速率下降分析;类型曲线的特征是多区油藏水平井产量的反映。本文的一个重要贡献是我们的模型消除了类型曲线中的振荡，从而解决了负趋肤问题。我们还表明，类型曲线的特征在很大程度上取决于不同区域的属性，表皮因子，井长，地层厚度等。我们的研究可应用于实际案例研究。

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