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油田压裂裂缝形态与三个轴应力大小及其相应方向上的岩石抗张强度大小有关。地下岩石单元体会受到两个水平轴应力和一个垂直轴应力三力共同作用。因此,油田裂缝形态也分为水平与垂直两大类。在油田进行生产活动前,必须清楚的了解裂缝所在的位置以及形态特征,我们只有掌握这些具体情况,才能针对不同井下状况选择最佳压裂方案。本文以此为基础,对大庆油田压裂裂缝形态及特征进行分析,进而提高压裂方案的优化设计。
Fracture fractures in oilfields are related to the magnitude of the three-axis stress and the rock tensile strength in the corresponding direction. Underground rock units are affected by the combination of two horizontal axis stresses and one vertical axis stress. Therefore, the fractures of oilfields are also divided into two major categories: horizontal and vertical. Before the production activities in the oilfield, we must know clearly the location of the fractures and the morphological characteristics. Only by understanding these specific conditions can we choose the best fracturing plan for different underground conditions. Based on this, this paper analyzes the fracturing fractures and characteristics of Daqing Oilfield, and then improves the optimal design of fracturing scheme.