Placement using viscosified non-Newtonian scale inhibitor slugs: The effect of shear thinning

K. S. Sorbie, E. J. Mackay, I. R. Collins, R. Wat

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    9 Citations (Scopus)

    Abstract

    Reservoir formations are often very heterogeneous and fluid flow is strongly determined by their permeability structure. Thus, when a scale inhibitor (SI) slug is injected into the formation in a squeeze treatment, fluid placement is an important issue. To design successful squeeze treatments, we wish to control where the fluid package is placed in the near-well reservoir formation. In recent work (Sorbie and Mackay 2005), we went "back to basics" on the issue of viscous SI slug placement. That is, we re-derived the analytical expressions that describe placement in linear and radial layered systems for unit mobility and viscous fluids. Although these equations are quite well known, we applied them in a novel manner to describe SI placement. We also demonstrated the implications of these equations on how we should analyze placement both in the laboratory and by numerical modeling before we apply a SI squeeze. An analysis of viscosified SI applications for linear and radial systems was presented both with and without crossflow between the reservoir layers. In this previous work, we assumed that the fluid being used to viscosify the SI slug was Newtonian (Sorbie and Mackay 2005). However, the question has been raised concerning what the effect would be if a non-Newtonian fluid was used instead. We mainly consider the effect of shear thinning, although our analysis is generally applicable if the non-Newtonian flow rate and effective viscosity function is known. We address the questions: Does the shear thinning behavior result in more placements into the higher or lower permeability layer (in addition to the effect of simple viscosification)? Can the shear thinning effect be used to design improved squeeze treatment? Copyright © 2007, Society of Petroleum Engineers.

    Original languageEnglish
    Pages (from-to)434-441
    Number of pages8
    JournalSPE Production and Operations
    Volume22
    Issue number4
    Publication statusPublished - Nov 2007

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