A planned wellbore consists of a 5,000-ft vertical section, a build up section to horizontal, and a 5,000-ft horizontal section

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A planned wellbore consists of a 5,000-ft vertical section, a build up section to horizontal, and a 5,000-ft horizontal section. The build up rate is 5 degrees per 100. A 5-in OD, 25.5 lb/ft (in air) steel drill pipe is being used. An 8.5-inch hole is being drilled with 12 lb/gal mud, and the coefficient of friction is 0.3. Assume that the pipe is (approximately) on the bottom of the hole when rotating and there is no weight on the bit.

Calculate:

1. Torque at surface when rotating off bottom
2. Axial load at surface when rotating off bottom
3. Axial load at surface when pulling out of the hole
4. Axial load at surface when going into the hole
5. Plot axial tension vs. measured depth on one graph
6. Available and net WOB
7. Available Torque at bit