论文标题
关于弹性塑料材料中液压断裂的压力下降分析
On the pressure decline analysis for hydraulic fractures in elasto-plastic materials
论文作者
论文摘要
在本文中，分析了弹性塑料材料中平面应变液压断裂的问题。该分析基于裂纹传播和闭合的有限元方法计算，以模拟迷你范围校准测试。在弹性塑料材料中鉴定了裂缝演化的基本趋势，并与岩石纯粹的弹性变形所获得的结果进行了比较。进行压力下降分析以识别闭合应力和泄漏系数。结果表明，对于破裂材料不足道变形的情况，也可以采用压力下降分析的标准技术。
In this paper the problem of a plane strain hydraulic fracture in elasto-plastic material is analyzed. The analysis is based on Finite Element Method computations of crack propagation and closure to simulate the Mini-Frac calibration test. The basic trends of fracture evolution are identified for both, the propagation and the closure stage in elasto-plastic materials and compared with the results obtained for purely elastic deformation of rock. Pressure decline analysis is conducted to identify the closure stress and leak-off coefficient. The results show that the standard techniques of pressure decline analysis can be adopted also for the case where the fractured material deforms inelastically.
