Modeling the Rate of Mud Invasion in a Permeable Formation

Kingdom Kponanyie Dune¹ , Bright Bariakpoa Kinate² , Adaobi Stephenie Nwosi-Anele³

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.4 , pp.22-27, Dec-2020

Online published on Dec 31, 2020

Copyright © Kingdom Kponanyie Dune, Bright Bariakpoa Kinate, Adaobi Stephenie Nwosi-Anele . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
The invasion of mud filtrates in to the permeable formation is an inevitable experience during drilling operations. It is usually associated with near-complete formation damage in the immediate vicinity of wellbore and the response of well log tools (especially the low penetration tools) are then greatly influenced by the mud filtrates instead of formation fluids which makes its interpretation more difficult. Hence, it is often necessary to know the possible spatial and time variation of mud filtrate concentrations in the porous media during invasion. This study presents a model technique for the numerical simulation of rate of mud invasion using a pressure transient analogy of mud concentration gradient. The model uses a finite difference element of 1000ft3 divided into five (5) uniform gridblocks of length, 2ft each. The results of the study showed clearly that from the time and space of invasion process initialisation, the mud concentration diffuses into the porous medium. At early time of invasion, the mud filtrate is continuously diffused into the porous media while at later stage of invasion, mud concentration builds from the inner gridblocks facilitating the formation of filter cake at the wellbore. Further analysis of the results reveals that the displacement of the in-situ formation fluid by the invading mud is not a piston-like phenomenon as shown by the spatial variation of the mud filtrates concentration during the invasion period. However, the concentration gradient can be used to define the extent of mud filtrate invasion into the permeable formation

Key-Words / Index Term :
Mud Concentration, Mud Flow rate, Mud invasion,Numerical Simulation, Permeable Formation

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