Estudo numérico sobre a perda de circulação de fluido de lei de potência em canal parcialmente poroso e fraturado

Abstract

In the oil well drilling process, the drilling fluid is in constant interaction with geological formations (e.g. fractures, highly permeable formations, cavernous pores). In this scenario, it is necessary to work with the pressure in the annular region of the well above that of the pores to avoid the influx of the formation fluid, thus characterizing the loss of circulation. One of the methods to combat this problem is the drilling fluid selection, which consists of choosing a fluid whose rheological properties are adapted to each situation. In this work, a numerical study for the validation of the threedimensional flow of power law fluid will be carried out. The geometry uses as a base the experimental apparatus that contains a free channel and another with a porous medium in the direction of flow, with the latter having a transverse channel that represents the fracture. The equations that describe the flow are those of NavierStokes and generalized for the homogeneous porous medium. The parameters used as a reference in the configurations are: the Reynolds number (Re = 100; 200), the specific mass (ρ = 1168; 1004kg / m³), dynamic viscosity (µ = 10cP); the material consistency index (k = 0.205Pa.sn); the power law index (n = 0.568); the leakage flow rate (Qv = 10%; 30%; 50%); porosity (ε = 0.75); and the porosity density (20PPI). As responses, the differences in pressure of the free channel DeltaP and Pdiff of the fracture will be analyzed.