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重馏分特征化对油气藏流体相态特征模拟计算的影响
  • 期刊名称:复杂油气藏
  • 时间:0
  • 页码:39-43
  • 语言:中文
  • 分类:TE311[石油与天然气工程—油气田开发工程]
  • 作者机构:[1]西南石油大学'油气藏地质及开发实验室'国家重点实验室,四川成都610500
  • 相关基金:基金项目:国家自然科学基金“考虑地层水蒸发的高温高压油藏相态和渗流机理研究”资助(50604011)
  • 相关项目:考虑地层水蒸发的高温高压油气藏相态和渗流机理研究
中文摘要:

目前最常用的重馏分特征化方法是直接将C7+(或C11+)按伽马分布函数中指数分布延伸,即常常直接将伽马分布函数的形态系数值取为1。不同类型的油气流体,这样处理未必能与实际的重馏分组成分布实现最佳匹配,有可能使状态方程预测的相行为出现严重的偏差。以实测油气流体的烃组成数据为基础,运用热力学分布函数预测理论,借助WinPorp相态模拟软件,通过延伸北海油田等多个实际油气烃类体系C7+和C11+重馏分中各窄馏分的组成分布,分析伽马分布函数形态系数取值对C7+和C11+不同碳数重质组分延伸起点的适应性,以及不同延伸计算结果对相态模拟的影响,说明正确的重馏分特征化方法对相态模拟的重要意义,并给出改善重馏分特征化合理性的建议。

英文摘要:

At present, the most commonly used splitting scheme method of the undefined plus fraction by the reservoir simulation engineers is the evaluation of gamma distribution function, and often the function' s morphological coefficient value is 1. However, this procedure could not be the most reasonable for different variants of reservior fluids. Therefore, the hydrocarbon phases calculation may lead to some errors and even the divergence in the critical area of the phase diagram. Here it is shown that several North Sea fluid samples of laboratory hydrocarbon molar distribution behavior and the simulated narrow fractions' distribution of C7 + or C11+ by the thermodynamic splitting methods with WinProp, analyzing the influence of the morphological coefficient = 1 on the suitability of different heavier compositions and the effect of the different splitting scheme treatment on the hydrocarbon phases calculation, and explaining the important place of the appropriate splitting scheme treatment of the heavy components characteristics, and all that could give some advice to the heavy fractions characterization procedure.

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