A flowing well 8,000 ft deep will be producing 600 bdp of 35 degree API crude oi
ID: 231812 • Letter: A
Question
A flowing well 8,000 ft deep will be producing 600 bdp of 35 degree API crude oil with a flowing surface well head pressure of 720 psig. The flowing Gas Oil Ratio (GOR) is 300 SCF/bbl, and the reservoir pressure measured at the static condition is 4,100 psig. There are 4 tubing sizes available for this well, which are 1,380, 1.751, 1.995 and 2.441 inches I.D. With this information: Determine the flowing bottomhole pressure for each tubing size. Which of the four tubing sizes would you recommend for a productivity index of 0.75 bbl/day. psi? Explain why.Explanation / Answer
The formula to determine the bottom hole pressure is
Pbh= Pwh*e^((Sg/R)H)/Tav*t
Pbh= bottom hole pressure in psig
Pwh= well head pressure in psig
Sg= specific gravity of oil
R= gas constant
Tav= average temprature
t= tube size
Pbh= 720*e^(((0.918/53.36)*8000)/35)*1,380= 520*10^5 psig
Pbh= 720*e^(((0.918/53.36)*8000)/35)*1.751= 66*10^3 psig
Pbh= 720*e^(((0.918/53.36)*8000)/35)*1.995= 75*10^3 psig
Pbh= 720*e^(((0.918/53.36)*8000)/35)*2.441= 92*10^3 psig
productivity index formula J= Q/(Pe-Pwf) bbl/day psi
J= 600/(4100-720) = 0.1775 bbl/day.psi
in my point of view, tube size of 1.751 inches is recommended for a productivity index of 0.75. why because the diameter of the tube is low, then the production of the well is high. productivity index is defined as a measure of the well potential or its ability to produce.
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