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PETE 406

PETE 406. UBD homework. Problem 1. Do Angel first and get circulation rate. Then calculate the BHP. Angel Minimum velocity. Q min can be approximated by: Q min = Q o + NH Q o = injection rate (scfm) at zero depth that corresponds to an annular velocity of 3000 ft/min

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PETE 406

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  1. PETE 406 UBD homework

  2. Problem 1 • Do Angel first and get circulation rate. • Then calculate the BHP Harold Vance Department of Petroleum Engineering

  3. Angel Minimum velocity • Qmin can be approximated by: • Qmin = Qo + NH • Qo = injection rate (scfm) at zero depth that corresponds to an annular velocity of 3000 ft/min • N = factor dependent on the penetration rate (Appendix C) • H = hole depth, 1000 ft. Harold Vance Department of Petroleum Engineering

  4. Harold Vance Department of Petroleum Engineering

  5. BHP - Angel Harold Vance Department of Petroleum Engineering

  6. BHP - Angel Harold Vance Department of Petroleum Engineering

  7. Gray’s terminal velocity • This is an iterative procedure. • You have a maximum BHP to remain underbalanced. • You should have a target BHP • You can start with the BHP from Angel (or any other criteria) Harold Vance Department of Petroleum Engineering

  8. Gray’s terminal velocity Harold Vance Department of Petroleum Engineering

  9. Gray’s terminal velocity Harold Vance Department of Petroleum Engineering

  10. Problem 2 - SPP and surface injection rate Harold Vance Department of Petroleum Engineering

  11. Problem 2 - SPP and surface injection rate Harold Vance Department of Petroleum Engineering

  12. Surface injection rate • Q from problem 1 Harold Vance Department of Petroleum Engineering

  13. Problem 3 • BHP from Problem 1 • multiply by 1.89 • using the pa equation for sonic flow, calculate a nozzle area Harold Vance Department of Petroleum Engineering

  14. Problem 4 • Terminal velocity for natural gas • divide the terminal velocity for air by the square root of the gas specific gravity • Calculate new BHP based on the new flow rate and specific gravity Harold Vance Department of Petroleum Engineering

  15. Problem 5 • Calculate an effective ROP Harold Vance Department of Petroleum Engineering

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