Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
DDPM-DEM Simulation of the Mud Cake Build up in Cross Flow Filtration over Heterogeneous Porous Medium
Submission Author:
Vinicius Gustavo Poletto , PR
Co-Authors:
Vinicius Gustavo Poletto , Fernando Cesar De Lai, Silvio L. M. Junqueira
Presenter: Vinicius Gustavo Poletto
doi://10.26678/ABCM.ENCIT2018.CIT18-0318
Abstract
The lost circulation is a frequent problem in well drilling operations under overbalanced conditions, possibly becoming severe if the permeability of the porous formation is high. The utilization of the Lost Circulation Materials may be a solution because it is possible to grow a mud cake on the porous formation, sealing the pores and reducing the fluid flow rate that is lost to the formation. In this problem, the mud cake growth under dynamic filtration conditions is considered in a vertical channel bounded by a porous medium. The flow is considered in pore-scale, modeling the porous structure as an anisotropic array of staggered cylinders. The LCM’s are considered to be solid and discrete particles immersed in the fluid. The formation of the mud cake occurs as a consequence of the particle packing on the porous medium. An Euler-Lagrange approach is used to the modeling of the particles movement and the fluid flow, with the numerical solution being resorted via the Dense Discrete Phase Model (DDPM) coupled to the Discrete Element Methods (DEM). The DEM is used to compute the contact interactions, such as collisions and friction. The effects of the variation of the Reynold number on the vertical channel (125, 250, 500) and the lost circulation intensity, measured by the fluid loss ratio through the porous medium, (5, 10, 20%) are evaluated. The effectiveness of the mud cake on the mitigation of the lost circulation is analyzed by the morphology of the mud cake (e.g. height, length, penetration) and the transient curves for the fluid loss ratio and the relative permeability of the porous medium.
Keywords
DDPM-DEM, Dynamic filtration, lost circulation, LCM, Mud cake
