Abstract:During the drilling and completion of oil wells, the drilling fluid flowing down the annulus can invade the rock formation, possibly causing irreversible damage to the reservoir. One of the main functions of these fluids is to form a film with low permeability on the borehole wall to prevent invasion of filtrate in the rock formation. Polymeric additives are increasingly used to control these infiltrations. Recent studies have shown the potential of using microspheres made of poly(methyl methacrylate-co-vinyl … Show more
“…However, the preparation process is complex and costly. There is a variable compatibility with the formation in actual production. − Inorganic particles are a type of plugging agent that is insignificantly affected by formation factors and whose particle size is easy to control. The high density of inorganic substances leads to a poor suspension and rigidity without deformation.…”
“…However, the preparation process is complex and costly. There is a variable compatibility with the formation in actual production. − Inorganic particles are a type of plugging agent that is insignificantly affected by formation factors and whose particle size is easy to control. The high density of inorganic substances leads to a poor suspension and rigidity without deformation.…”
Large volumes of drilling fluids are used while drilling oil wells. Water‐based fluids are widely used because they are generally less expensive and more environmentally correct than synthetic fluids. Polymers are used in drilling fluids with different functions. This article reports a study of the rheological behavior of solutions containing xanthan gum (XG), hydroxypropyl starch (HPS) and cashew gum (CG), as well as their binary mixtures, to evaluate the applicability of CG (an abundant product in Brazil's northeastern region) in aqueous fluid formulations. The results show the potential to use CG in mixtures with XG. The thixotropic effect is confirmed by hysteresis loop analysis; the rheological behavior is satisfactorily described by the Ostwald‐de Waele and Casson models; the aqueous solutions containing XG/HPS mixtures present higher consistency indexes than the XG/CG mixtures; and the activation energy values of the XG/CG mixtures are governed by the CG fraction.
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