储层应力敏感性三轴测试方法研究

Research on the measurement of reservoir stress sensitivity under triaxial condition

应力敏感评价是储层保护以及油气井产能评价的重要依据。应力敏感是指储层岩石渗透率随着地应力变化而发生变化。常规应力敏感是在单轴条件下进行测量的,本文在单轴试验方法的基础上建立了三轴条件下应力敏感性测试方法,并将测试结果与单轴条件下的测试结果进行对比,发现三轴和单轴应力敏感测试结果有明显的差异,三轴应力敏感测量结果更接近实际油藏条件。

Stress sensitivity evaluation is important to reservoir protection and well production determination. Stress sensitivity means that rock permeability changes with geostress. The general stress sensitivity was measured under uniaxial load condition. Triaxial stress sensitivity measurement method was established based on uniaxial testing method, but more closer to the in-situ stress condition. Results show that triaxial testing is quite different form uniaxial.