Abstract
Sand failure and production occurs when the formation stress exceeds the strength of the formation, which is derived majorly from the natural material that cements the sand grain and cohesive forces. This study investigates the effects of scale inhibitor, biocide and corrosion inhibitor on the geomechanical strength of reservoir rocks (carbonate and sandstone). Integration of geomechanical, petrophysical and analytical techniques is used to establish the failure effects of the interaction of these chemicals on the geomechanical strength of reservoir rocks and failure mechanisms resulting from such interaction. The results confirm that chemical adsorption, dissolution, precipitation and ionic substitution reactions took place between the oilfield chemicals and the formation rocks leading to weakening of the reservoir grain fabrics and reduction in unconfined compressive strength which in turn causes sand failure.
Highlights
Sand failure may result in the production of formation sand at the same time the formation fluids are being produced
Clastic and carbonate cores obtained from Texas, USA, through Kocurek industries were used in the study
The results suggest that chemical interactions in the form of adsorption, dissolution/precipitation and ionic substitution took place between the oilfield chemicals and the rocks
Summary
Sand failure may result in the production of formation sand at the same time the formation fluids are being produced. This phenomenon is experienced when the sand grains disengage from the rock matrix structure due to mechanical and/or chemical activities. The importance of evaluating the effect of oilfield chemical/reservoir rock interaction on the reservoir geomechanical properties cannot be overemphasized. It is imperative to evaluate the geomechanical effects of these oilfield chemicals on the properties of the reservoir rock to be able to develop accurate sand failure prediction models (Oluyemi et al 2010). The alteration, which could result in a decrease or an increase in these rock properties depending on the mineral composition of the rock, particle size distribution, shape of the particle and
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