A Study On Well Testing Analysis For Fractured Formation Phase Transformation Gas Well

Due to the complexity of the fractured phase, fractured reservoir gas phase of well test well test become difficult and important. Previous gas well well test analysis method without considering the reservoir and variable wellbore influence of strata pressure sensitive. However, due to fractured reservoir of its own characteristics, phase of strata pressure sensitive and wellbore changes in the pressure and the reservoir pressure derivative dynamic has significant influence. And because of the natural fracture development circumstance, common dual medium, triple medium model fitting actual data exist certain gap, in order to reduce the gap, under the influence of Considering changing wellbore storage and formation pressure,a fractured phase transition gas well test model is established,in this paper,and use of Matlab draw the theoretical curves. achievements are as follows:(1)For the outer boundary conditions for the infinite case, established dual fractured porous media gas condensate well test analysis model about changing wellbore storage and formation pressure sensitive, solve the model and draw the typical curve, and analyses its factors;(2)For the outer boundary conditions for the infinite case, established triple fractured porous media gas condensate well test analysis model about changing wellbore storage and formation pressure sensitive, solve the model and draw the typical curve, and analyses its factors;(3)For the outer boundary conditions for the infinite case, established fractal media fractured gas condensate well test analysis model about changing wellbore storage, solve the model and draw the typical curve, and analyses its factors;(4)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.