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CORRECTI.ONS
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1989-12-18
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Some Tool Kit Hints and Corrections
From Petroleum Engineering Magazine
I have found some small problems with the equation used when calculating the
corrected Pc for sour gases in GASVOL, BHPCALC, and GASDEL and the bubble point
pressure in GASCOMP. The corrections should be made to the four programs by
recalling each program and "turning off" the global cell protection with the
following key sequence:
/WGPD (/, Worksheet, Global, Protcction, Disable)
The corrections that are to be made are as follows: (note: only the highlighted
characters need to be changed)
GASVOL - Cell F6 should read:
(1-C6/100-C7/1OO-C8/1OO)*J7+493*C6/100+1071*C7/100+1306*C8/100
Cell F8 should read:
(F6*(F5-J8))/(F5 + (C8/100)*(1-(C8/100))*J8)
BHPCALC-Cell J9 should read:
(F8*(F9-J6))/(F9+(F7/100)*(1-($F$7/100))*$J$6)
BHPCUM-Cell L9 should read:
(G9*(G10-L6))/(G10+(G8/100)*(1- ($G$8/100))*$L$6)
GASCOMP- Cell F20 should read:
@EXP(A*(0.2*C9 + C10 + C11 + 0.4*C12 + C13 + 2*(C14 + C15 + C16)
+ C17 + C18 + C19) + B*L9 + C*(C12/(L7 + 0.2))
+ D*L6 + E*L + F*L*L + G*L^3 + H*M + I*M^2 + J*M^3 + K)
The above correction will change the bubble point pressure in the example given
in the article describing GASCOMP (Fig. l) from 1,824 to 1,856.
Cell protection can be tumed back on by typing:
/WGPE (/, Worksheet, Global, Protection, Enable)
There was another problem in the article on GASVOL (PEI, December 1988, p. 36).
Fig. 1 was incorrect and should appear as is in this new Fig. 1
╔═════════════════════════════════════════════════════════════════════╗
║ ║
║ RECOVERABLE GAS RESERVES PROGRAM ║
║ ║
║ ╔═══════════════════════╗ ║
║ WELL NAME: ║TEST WELL ║ ║
║ FIELD NAME: ║MORROW ║ Z3-Jan-89 ║
║ ╠═══════════════╦═══════╝ ║
║ GAS GRAVITY ║ 0.60 ║ Tc = 359.26 ║
║ % N2 ║ 0.00 ║% Pc = 670.98 ║
║ % C02 ║ 0.00 ║% Tc' = 359.26 ║
║ % H2S ║ 0.00 ║% Pc' = 670.98 ║
║ CONDENSATE (YES=1) ║ 1 ║ Tr = 1.617 ║
║ RES. TEMPERATURE ║ 120 ║'F Pri = 5.216 ║
║ INITIAL PRESSURE ║ 3500 ║psia Pra = 1.490 ║
║ ABANDONMENT PRES ║ 1000 ║psia Zi = 0.8659 ║
║ NET PAY ║ 25 ║feet Za = 0.894Z ║
║ ACRES ║ 160 ║acres ║
║ WATER SAT ║ 33.00 ║% ║
║ POROSITY ║ 18.10 ║% ║
║ ╚═══════════════╝ ║
║ GAS IN PLACE 5,218,054 MCF ║
║ RECOVERABLE GAS 3,774,418 MCF CF/AC-FT 943.60 ║
║ RECOVERY 72.33% ║
║ ║
╚═════════════════════════════════════════════════════════════════════╝
Fig. l . Example of the GASVOL program's home screen.