Study on characteristics of well-test type curves for composite reservoir with sealing faults
Study on characteristics of well-test type curves for composite reservoir with sealing faults
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DOI：
10.1016/j.petlm.2018.03.011
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Qi-guo Liu;Heng Lu;Long-xin Li;A. Mu
中科院分区：
文献类型：
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作者：
Qi-guo Liu;Heng Lu;Long-xin Li;A. Mu
内、外带封闭断层的复合油藏压力响应不同，以往的研究忽视了这一点，在试井解释中会造成较大的误差。以渗流理论为基础，建立了考虑井筒储集和集肤效应的无限外边界两区径向复合油藏试井模型。应用镜像法、拉普拉斯变换和叠加原理，分析了直断层、垂直断层和平行断层三种情况下该模型的解和型曲线的特征。研究表明，井到断层距离较大和小于内区半径一半的两种情况下，无因次压力导数曲线会有明显的不同。为此，给出了合理参数的型式曲线，分析了距离对动压响应的影响。研究成果对指导油气复合油藏的生产，优化油气采收率具有重要意义。
The pressure response for the composite reservoirs with a sealing fault locating in inner and outer region is different, which neglected by previous researchers, would cause significant errors during well-test interpretations. Based on seepage theory, a well-test model of two-region radial composite reservoir with infinite outer boundary has been built in this study considering wellbore storage and skin effects. The solutions for this model and characteristics of the type curves have been analyzed by applying the method of mirror image, Laplace transformation and superposition principle, including a straight fault, a perpendicular fault and parallel faults cases. The study shows that the dimensionless pressure derivative curves would be obviously different in two cases: the well to fault distance is larger, and smaller than the half length of the inner-region radius. Therefore, type curves are presented with reasonable parameters to analyze the distance effect on the dynamic pressure response. The results in this study are of great significance for guiding the oil and gas composite reservoirs' production and optimizing the hydrocarbon recovery.