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引用一个巴西人的实验来模拟张性天然裂缝,该实验主要是通过把岩心置于强张力状态下来使整个岩心起缝,然后在不同的有效应力状态下,通过模拟油藏衰竭情况来估算应力相关性渗透率。实验结果表明天然张性裂缝的导流能力比剪切裂缝的导流能力低得多,而剪切裂缝的导流能力又比支撑剂裂缝的导流能力低。岩石基质中的有效应力的概念与天然裂缝中的概念完全不同。因此,在任何模拟研究中对岩石基质与天然裂缝中的有效应力都应该分别加以估算,这样才能获得具有代表性的数值。张性裂缝在油藏能量衰竭前期就已失去了导流能力,为了提高油藏的采收率,就要对张性裂缝进行处理。该研究的主要成果有:理解怎样有效地控制天然裂缝来增大油井的产能;定量分析在基质和裂缝系统中有效应力的概念;为模拟研究提供应力相关性关系。
Citing a Brazilian experiment to simulate natural flaws in tension, the experiment mainly cracks the entire core by placing the core under strong tension, and then estimates the stress by simulating reservoir failure under different effective stress conditions Correlation Permeability. The experimental results show that the flow conductivity of natural tension cracks is much lower than that of shear cracks, and the flow conductivity of shear cracks is lower than that of proppant cracks. The concept of effective stress in a rock matrix is completely different from that in natural fractures. Therefore, the effective stress in the rock matrix and natural fractures should be estimated separately in any simulation study, so as to obtain the representative values. Tensile fractures lose their ability to divert fluid energy prior to the depletion of reservoirs. In order to increase oil recovery, it is necessary to treat the tensile fractures. The main achievements of this study are: to understand how to effectively control natural fractures to increase the productivity of oil wells; to quantitatively analyze the concepts of effective stress in matrix and fracture systems; and to provide stress-related relationships for simulation studies.