Oilwell completion fluid solids interaction with an unconsolidated oil reservoir

Document Type

Article

Publication Date

1-1-1987

Abstract

This work addresses the problem of modelling, detection and evaluation of the mechanical interaction between oilwell completion fluid particles and granular reservoir rocks. These interactions contribute to a reservoir productivity reduction known as the “permeability damage” phenomenon. Fundamental concepts of cake filtration and filter medium filtration were used to formulate mathematical models of particles capturing: gradual pore blocking, screening, and straining. The models provide theoretical bases for simple diagnostic plots in which the linearity of a plot becomes an indication of a prevailing mechanism of particles’ capture. Laboratory tests were run by pumping a completion fluid through synthetic simulated cores of unconsolidated sandstone gas reservoir samples from the Adriatic Sea. By using diagnostic plots and grade passing efficiency curves, the effects of total solids concentration particle size on the type and efficiency of the capture mechanism were investigated. The study revealed the existence of three mechanisms of particle capture and the applicability of diagnostic plots for their detection. The onset of the straining mechanisms was attributed mainly to the total solids concentration while the duration of the gradual pore blockage phase was correlated with both particle size and concentration. © 1987 by Hemisphere Publishing Corporation.

Publication Source (Journal or Book title)

Particulate Science and Technology

First Page

173

Last Page

192

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