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HW #3. Axial Tension04 Solution - Homework#3 Axial Tension...

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Homework #3: Axial Tension in Casing String Due Wednesday, September 22, 2004 A. A 13 3/8-in OD, 85 lb/ft casing string, 5,000 ft long, is hanging in an open hole filled with air. Please calculate and plot axial tension vs. depth (see first part of Lesson 4). (i) Axial tension at surface (Hook Load) = ………………….. lbf 5000 x 85 = 425,000 lbf (ii) Axial tension at the bottom (Buoyancy Force) = ……………0…….. lbf Since this is in an air filled hole, the buoyancy is essentially nil and axial tension at the bottom is zero B. A 13 3/8-in OD, 85 lb/ft casing string, 5,000 ft long, is hanging in an open hole filled with 13 lb/gal drilling mud. Please calculate and plot axial tension vs. depth (see first part of Lesson 4). (i) Axial tension at surface (Hook Load) = ………………….. lbf Here we assume that there is 13.0 ppg fluid inside and outside of the casing Weight of the mud inside the casing is: 6.0319 Gal/ft x 5000 ft x 13.0 ppg = 392,074 lbf Buoyancy force = 7.2987 gal/ft x 5000 ft x 13 = 474,416 lbf
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