HW. 4

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Oklahoma State University *

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Mechanical Engineering

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Feb 20, 2024

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Assignment # 4 PETE 4313 – Drilling and Well Completions Name: __________________________ Fracture Gradient and Pore Pressure Due: Feb 22, 5:00 pm | worth 50 points Include additional worksheets with calculations for partial credits in the event your final answer is not correct. 1. A gas filled reservoir in the Anadarko basin has a reservoir top at 4000 ft. The gas-water contact is at 5000 ft. The water at 5000 ft is normally pressured. The density of gas is 1 lb/gal. Compute the reservoir pressure at the top of the reservoir (at 4000 ft). 2. What are the main sources of over pressure? 3. What is the effect of compaction on pore pressure and overburden stress? 4. Compute the normal formation pressure expected at a depth of 5,500 ft for: West Texas US gulf coast California Rocky Mountains Anadarko basin 5. Compute the vertical overburden stress at 5500 ft with an overburden gradient of 22 lb/gal for an onshore well. 6. For the Gulf of Mexico, compute the vertical overburden stress at 5500 ft with an overburden gradient of 22 lb/gal where the water depth is 1000 ft. 7. Calculate the effective vertical stress for problems 5 and 6. Use a pressure gradient of 0.433 psi/ft for the pore fluid. 8. How is the total and effective overburden stress being changed with water depth?
9. Based on the 5 LOT tests provided below: a) Determine the LOP point for each test by plotting the pump pressure versus the volume of mud. b) Calculate the fracture gradient for each test. A midweight of 11 lb/gal was used down to 2500 ft and 14 lb/gal after 2500 ft. c) Determine the fracture gradient with a kick margin of 0.25 ppg. Depth (a) LOP MW (b) FG grad (c) Grad w. kick ft psi lb/gal lb/gal lb/gal 1000 2000 3000 4000 6000 LOT Tests 1000 ft 2000 ft 3000 ft 4000 ft 6000 ft Pump pressure (psi) Total mud pumped (bbl) Pump pressure (psi) Total mud pumped (bbl) Pump pressure (psi) Total mud pumped (bbl) Pump pressure (psi) Total mud pumped (bbl) Pump pressure (psi) Total mud pumped (bbl) 5 0.2 5 0.2 5 0.2 50 0.2 130 0.2 10 0.6 18 0.6 20 0.6 115 0.6 220 0.6 20 1 31 1 35 1 180 1 310 1 30 1.4 44 1.4 50 1.4 245 1.4 400 1.4 40 1.8 57 1.8 65 1.8 310 1.8 490 1.8 50 2.2 70 2.2 80 2.2 375 2.2 580 2.2 60 2.6 83 2.6 95 2.6 440 2.6 670 2.6 70 3 96 3 110 3 505 3 760 3 80 4 109 3.4 125 3.4 570 3.4 850 3.4 90 5 122 4.4 140 4.4 635 4.4 920 4.4 100 6 135 5.4 155 5.4 700 5.4 990 5.4
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