双重介质油藏水平井试井分析方法

水平井开发双重介质油藏比直井能取得更好的开发效果,已为油田开发的实践所证实。水平井试井分析是油藏类型识别及求取地层参数的重要手段。考虑井筒储集和表皮效应的情况下,建立了双重介质无限和盒型封闭油藏中水平井三维渗流的数学模型,利用拉普拉斯变换获得了数学模型的解,并对一口实例水平井的试井资料进行了分析,获得了裂缝渗透率、表皮系数、井筒储集系数、弹性储容比和窜流系数,结果表明,所提出的理论和方法是可行和实用的。

ANALYSIS METHOD OF TRANSIENT TEST FOR HORIZONTAL WELL IN DUAL POROSITY RESERVOIR

It is well known that the oil rate of horizontal well is much higher than that of vertical well in dual porosity reservoir.Transient test is an important means of obtaining reservoir parameters and identifying reservoir type. This paper presents a mathematical model of 3D horizontal well with wellbore storage and skin effect in dual porosity infinite and box-shape reservoir. The mathematical model is solved by means of Laplace transform. Based on the model presented above, the transient test data from an example horizontal well has been studied to produce fracture permeability, skin factor, wellbore storage coefficient, storativity -ratio and inter-porosity flow coefficient. The results show that the theory and method presented in this paper are reliable and applicable.