关于低渗致密储层岩石的应力敏感问题——与李传亮教授探讨

Discussion of stress sensitivity of low permeability and tight reservoir rocks

有学者把低渗岩石在实验室测试中表现出的强应力敏感性归结为实验系统误差造成的错误,笔者对这种说法存有一定疑问,认为用目前孔渗测试设备得到的实验数据不存在无法解释的逻辑反转问题。低渗岩样在实验室的覆压实验中存在强应力敏感性与其变形特征密切相关。但由于与实验过程中岩样经历的应力变化范围有所不同,低渗储层在油气开采过程中并不存在非常强的应力敏感性,在生产过程中适度考虑即可。此问题的探讨对于低渗储层岩样的实验测试方法以及低渗致密储层的有效开发具有实际意义。

Professor LI Chuanliang considered that it was experimental error resulted in strong stress sensitivity of low permeabilityrock in laboratory. However, in my opinion, there is not serious systematic error for porosity and permeability measurement equipment,and there is not unexplained logic error for experimental data. Low permeability rock presents strong stress sensitivity in laboratory,which is closely relative to its deformation characteristics. However, because of the different stress variation range, stress sensitivity oflow permeability reservoir during the oil and gas production is not as strong as that of low permeability rock in laboratory. So the effect ofstress sensitivity on oil and gas production cloud be considered moderately. The discussion of this paper is practical to the experimentalmethods and development of low permeability and tight reservoirs.