Settling behavior of particles in fiber-containing Herschel Bulkley fluid

摘要: Abstract Fiber-containing, or fibrous, fluids are used in the petroleum industry to improve well-bore cleaning. Field studies indicate that fiber-containing sweep can clean horizontal and highly inclined wells of drill cuttings very effectively. Fibrous also utilized fracturing operations place proppant particles within induced fractures. Efficiency solid particle transport by these depends on their ability hinder settling dispersed particles. This article presents results experimental theoretical investigations conducted behavior spherical Herschel-Bulkley containing chemically inert monofilament fibers 10 mm length 0.1 mm diameter at concentrations ranging up 0.08% weight. A model has been developed predict velocity under transient steady state conditions. Experiments were carried out with glass 2 8 mm a 100-mm fully transparent cylinder sufficient (2 m) establish terminal Wall effects minimized maintaining ratio internal (d p /d cyl ) no greater than 0.08. To vary rheological properties fluid, xanthan gum suspensions three different polymer as base fluids. moving digital video camera was track The records determine instantaneous each function time. In fibrous suspensions, resistance is provided both fluid (viscous drag) (fiber drag). Fiber drag arises from mechanical hydrodynamic interferences. Measurements compute viscous drag, while data total (i.e. fiber plus Analysis resulted development an empirical correlation for “fiber coefficient,” which varies Reynolds number, concentration index. With this information, be prescribed