P8) A well is being drilled at a depth of 6,000 ft using a Bingham plastic fluid having a density of 1: Ibm/gal, a plastic viscosity of 25 cp, and a yield point of 5 Ibf/100 sq ft. as the drilling fluid. The 5500 ft long drillpipe string has an external diameter of 4.5 in. and an internal diameter of 3.826 i and the drill collar has an ID of 2.7 and an OD of 7 in. The diameter of the hole is 8 in. The drilling fluid is being circulated at a rate of 470 gal/min. Assume a relative roughness of zero. a) Determine the flow pattern in the drillpipe, and calculate the frictional pressure loss per 1,000 ft of drill pipe. b) Determine the flow pattern in the drill collar, and calculate the frictional pressure loss per 1,000 ft of drill collar. c) Determine the flow pattern in the annular opposite the drillpipe, and calculate the frictional pressure loss per 1,000 ft of annulus.

P8) A well is being drilled at a depth of 6,000 ft using a Bingham plastic fluid having a density of 1: Ibm/gal, a plastic viscosity of 25 cp, and a yield point of 5 Ibf/100 sq ft. as the drilling fluid. The 5500 ft long drillpipe string has an external diameter of 4.5 in. and an internal diameter of 3.826 i and the drill collar has an ID of 2.7 and an OD of 7 in. The diameter of the hole is 8 in. The drilling fluid is being circulated at a rate of 470 gal/min. Assume a relative roughness of zero. a) Determine the flow pattern in the drillpipe, and calculate the frictional pressure loss per 1,000 ft of drill pipe. b) Determine the flow pattern in the drill collar, and calculate the frictional pressure loss per 1,000 ft of drill collar. c) Determine the flow pattern in the annular opposite the drillpipe, and calculate the frictional pressure loss per 1,000 ft of annulus.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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