Well Testing Analysis For Fractured Well In Stress-Sensitive Formation

Fractured technique is an effective measure for developing the reservoir. There are some defects in the existing well test models for Fractured reservoir. Especially, vertical fracture bilinear flow models does not consider the stress-sensitivity in the homogeneous and double Porosity reservoirs. Further studying on principle of flow of fluids through porous media in stress-sensitive reservoirs and vertical fractllre.Under the influence of formation pressure,a fractured well test model is established in this paper, achievements are as follows:(1)Further studying on the existing vertical fractured well of well test analysis modethe in the homogeneous formation.(2)Based on the existing models,finite-conductivity vertical fracture in stress-sensitive homogeneous reservoir bilinear and trilinear well test models have been established and worked out.The effects of the skin effect and wellbore storage have been considered,new type template curves have been plotted.(3)Finite-conductivity vertical fracture in stress-sensitive homogeneous reservoir bilinear and trilinear flow model by low-velocity non-Darcy’s law has been established, and then drawing the pressure and pressure derivative typical curves.(4)Based on the xisting models,Finite-conductivity vertical fracture in stress-sensitive formation with double Porosity bilinear and trilinear well test models have been established and worked out.The effects of the skin effect and wellbore storage have been considered.New type template curves have been plotted.(5)According to the curves painted,combining with the actual material drawing pressure and pressure, the derivative chart fitted,after the practical data confirmed by and rendering the well test theory drawing.