PETE 406 UBD homework.

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Petroleum Engineering 406

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Presentation transcript:

PETE 406 UBD homework

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

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

Harold Vance Department of Petroleum Engineering

Harold Vance Department of Petroleum Engineering BHP - Angel Harold Vance Department of Petroleum Engineering

Harold Vance Department of Petroleum Engineering BHP - Angel Harold Vance Department of Petroleum Engineering

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

Gray’s terminal velocity Harold Vance Department of Petroleum Engineering

Gray’s terminal velocity Harold Vance Department of Petroleum Engineering

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

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

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

Harold Vance Department of Petroleum Engineering 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

Harold Vance Department of Petroleum Engineering 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

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