Determinação da frente de um banco de fluido não-mewtoniano em um reservatorio com poço parcialmente completado

AUTOR(ES)

Jose Altamiro Carrilho Mota dos Santos

DATA DE PUBLICAÇÃO

1994

RESUMO

Water production due to water coning means great losses, inducing reduction in oil production and additional pressure drop in the reservoir, not mentioning the costs for disposal of the produced water - a major pollutant. One method used to decrease water production from coning is the injection of a non-newtonian fluid into the near wellbore region of the reservoir, for the fonnation of a permeability barrier to water flow. It is important for the engineer to determine the position of the fluid bank front in the reservoir, in order to evaluate the amount of injection fluid needed and to choose the wellbore segment to be perforated. The problem fonnulation is carried out from the partial differencial equation accounting for the flow of a power law fluid in porous media. The velocity field yielded by the solution of this equation is used in the diffusion-convection differential equation that describes the transport of polymer in the reservir. Due to the non-linear characteristic of the first equation, the solution is sought via a finite-difference numerical method employing a fully implicit algorithm. The solution obtained, in tenns of pressure and velocity fields, is compared against available analytical solutions for the non-newtonian flow in one dimension and for the newtonian flow in two dimensions. The study shows that the fluid flow in the core of the fluid bank is essentially in the steady-state regime, therefore the velocity field is independent of viscosity characteristics of the fluid - viscosity per se in newtonian fluids and behavior/consistency indexes in power law fluids. The complete solution for the problem is conveniently sought by a semi-analytical procedure, combining analytical long-tenn solutions for the velocity fields and numerical solution for the polymer transport equation

ASSUNTO(S)

petroleo fluidos não-newtonianos reservatorios subterraneos escoamento

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