Abstract:

Due to produced liquids,reservoir pressure declines,and permeability and productivity of wells decrease correspondingly,which is called stress sensibility.Stress sensibility of well productivity can be evaluated by stress sensitivity curves of permeability measured on cores under laboratory condition.According to the study in this paper,stress sensitivity index of productivity is the same as that of permeability.The laboratory stress sensibility of core is measured through increasing outer pressure of core,which can be transferred to reservoir condition by primary effective stress of rock.For conventional reservoirs,the stress sensitivity is quite weak,which can be neglected in production.

Key words: reservoir, reservoir pressure, rock, stress sensibility, productivity