2 lbgal overburden stress is 100 psift calculate 1

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Unformatted text preview: b/gal. Overburden stress is 1.00 psi/ft. Calculate: 1. Pore pressure, psi/ft , at 14,000 ft 2. Pore pressure, psi, at 14,000 ft 3. Matrix stress, psi/ft 4. Matrix stress, psi Fracture Gradients 1.11- 4 Formation Pressure and Matrix Stress σ overburden stress (psi) Fracture Gradients S = = P + σ+ SP pore = pressure (psi) + matrix stress (psi) 1.11- 5 Formation Pressure and Matrix Stress Calculations: Depth = 14,000 ft. Pore Pressure = 9.2 lb/gal equivalent Overburden stress = 1.00 psi/ft. 1. Pore pressure gradient = 0.433 psi/ft * 9.2/8.33 = 0.052 * 9.2 = 0.478 psi/ft 2. Pore pressure at 14,000 ft = 0.478 psi/ft * 14,000 ft = 6,692 psig Fracture Gradients 1.11- 6 Form...
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