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We are drilling at 1 0 0 0 0 f t in a formation with 2 0 % porosity, 3 0 % water saturation and

We are drilling at 10000ft in a formation with 20% porosity, 30% water saturation and 70% gas saturation. The temperature is 640R, and the mud density is 11 ppg. The gas gravity is .72. The drilling rate is 100fthr with a 12% inch blt. The circulation rate is 300gpm. Formation water is 9.04ppg, and formation rock density is 26ppg.
a. What is the mud density at the surface? PPg
b. What is the average density of the annular mud?
c. At what rate (SCFD) will gas be liberated at the surface?
Say we have a well with 8000ft of 4.265 drillpipe and 500ft of 83 collars. The viscosity is 15cp with 10ppg mud. The hole is 10 inches in diameter. The vg meter reads 15cp at 300rpm and 20 at 600rpm. The bit has 3 nozzles at 12/32's (make sure you can do this by hand .. you can check it with the spreadsheet)
a. At static conditions what is the pressure at the bottom of the well?
b. What is the pressure at the bottom of the weil while circulating? (Bingham plastic model)
c. What is the hp at the bit
d. What is the pump pressure?
In a V-G meter, we get readings of 21 at 300rpm and 33 at 600rpm.
a. Calculate the plastic viscosity and yield strength using the Bingham plastic model.
b. Calculate the consistency and flow-behavior indices using the power law mo
c. Derive and expression which gives you K and n from p and Ty.
Suppose we lower 4000ft of closed end 13 inch casing into a 15 inch hole contain ppg,15cp mud at 1ftsec.
a. What will the pressure be at the bottom of the well?
b. How much mud is displaced?
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