A Bingham, lastic fluid has a plastic viscosity of 50 cp and a yield point of...

 

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A Bingham, lastic fluid has a plastic viscosity of 50 cp and a yield point of 12 lbf/100 sq ft. Assuming that the flow pattern is laminar, compute the fric- tional pressure gradient resulting from (a) a flow rate of 50 gal/min through a drillstring having a 3.826-in. ID and (b) a flow rate of 90 gal/min through a 10- x 7-in. annulus. Answer: (a) 0.0171 psi/ft, (b) 0.0240 psi/ft. A Bingham, lastic fluid has a plastic viscosity of 50 cp and a yield point of 12 lbf/100 sq ft. Assuming that the flow pattern is laminar, compute the fric- tional pressure gradient resulting from (a) a flow rate of 50 gal/min through a drillstring having a 3.826-in. ID and (b) a flow rate of 90 gal/min through a 10- x 7-in. annulus. Answer: (a) 0.0171 psi/ft, (b) 0.0240 psi/ft.