正韵律底水油藏含水上升规律及其影响因素

为了确定X底水油藏含水上升规律,明确含水上升影响因素,找出减缓含水上升的方法,以该区块实际生产数据为基础,利用线性回归方法确定了该区块整体含水上升规律,并对单井含水上升规律进行划分。利用CMG数值模拟软件建立二维正韵律单井剖面模型,通过正交试验法研究了含水上升规律的影响因素,并总结了含水上升规律与影响因素之间的对应关系。研究结果表明,X区块整体含水上升规律为“S”型,单井含水上升规律可以划分为缓斜坡型、反“Z”型、“Γ”型、高波浪型和低波浪型等5类;无夹层时影响含水上升规律的因素主次排序为油水黏度比、打开程度、垂直水平渗透率比值、水体大小、定液量;单独考虑夹层时影响含水上升规律的因素主次排序为夹层位置、夹层渗透率、夹层大小。

Water cut rising laws of positive rhythm reservoirs with bottom water and their influential factors

To figure out the water cut rising laws of X bottom water reservoir, determine the factors influencing water cut rising and explore the method to alleviate water cut rising, the overall water cut rising laws of Block X was defined based on its actual production data by means of the linear regression method, and the single-well water cut rising laws were classified. Then, 2D positive rhythm single-well profile model was established using CMG numerical simulation software. Finally, the factors influencing water cut rising laws were investigated by means of orthogonal method, and the corresponding relationships between water cut rising laws and influential factors were concluded. It is indicated that the overall water cut rising law of Block X is in the shape of S and the single-well water cut rising laws can be classified into five types, i.e., low dipping type, inverted Z type, Γ type, high wave type and low wave type.It is revealed that the factors influencing water cut rising laws are ranked as oil/water viscosity ratio, opening degree, vertical-horizontal permeability ratio, water size and certain liquid volume if interlayers are not taken into consideration, and they are ranked as interlayer position, interlayer permeability and interlayer size if interlayers are considered independently.