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Petroleum Engineering 406

This lesson focuses on well control in petroleum engineering, emphasizing casing seat selection for various conditions, including land and shallow water operations and deep-water environments. It covers the determination of pore pressure, fracture pressure, and the application of various methods such as the Eaton method to evaluate pressures. The importance of understanding resistivity logs, conductivity, and sonic data in casing seat design is highlighted. Relevant equations and principles are presented to guide students in their homework and application in real-world scenarios.

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Petroleum Engineering 406

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  1. Petroleum Engineering 406 Lesson 5 Well Control

  2. Read • Well Control Manual • Chapter 9 • Homework 3 • Due Feb. 10, 1999

  3. Content • Casing Seat Selection • Land and shallow water • Conventional • Based on X ppg kick • Based on X ppg kick and X bbl gain

  4. Content • Casing Seat Selection • Deep Water

  5. Content • Casing Seat Selection • Riserless

  6. Land and shallow water • Plot Pore Pressure and Fracture Gradient curves • Pore pressure from Eaton • Resistivity log • FP=OB-(OB-FPn)*(Cn/Co)^1.2 • Conductivity • FP=OB-(OB-FPn)*(Ro/Rn)^1.2 • Sonic • FP=OB-(OB-FPn)*(DTn/DTo)^3

  7. Pore pressure from Eaton • dc exponent • FP=OB-(OB-FPn)*(dc calculated/dc normal)^1.2 • FP = formation pressure,ppg • OB = overburden stress, ppg • FPn = Normal formation pressure, ppg

  8. Pore pressure from Eaton • Ro = Shale resistivity from the well log, ohm-meters • Rn = Shale resistivity from normal trend • Co = Shale conductivity from the well log • Cn = Shale conductivity from the normal line • DTo = Shale travel time from the well log • DTn = Shale travel time from the normal line • dc = Corrected d exponent

  9. Fracture Pressure from Eaton • FG=(OB-FP)*[Poisson’s ratio/(1-Poisson’s ratio)]+FP

  10. Casing Seat Selection - Conventional

  11. Casing seat selection Standard 0.5 ppg kick 0.5 ppg kick 200’ tall Pore Pressure Fracture Pressure

  12. Data

  13. Deep Water Fracture Pressure • Eaton’s Gulf Coast Overburden Gradient

  14. Deep Water Fracture Pressure

  15. Deep Water Fracture Pressure

  16. Deep Water Fracture Pressure

  17. OB Gradient below ML

  18. Deep Water Fracture Pressure

  19. Deep Water Casing Seat

  20. Deep Water Casing Seat

  21. Riserless Casing Seats

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