Problem 79. A 26 mile, 18 inches internal diameter pipeline in good condition is flowing methane...50 dF & 500 psig and falls to 100 psig at the sales point; water content is 6 lbm water per MMSCF. Sales (MBOE/D) is best estimated to be:
(A) 29.
(B) 34.
(C) 39.
(D) 44.
Note: Older versions erroneously had "millions" in the answer wording (corrected here).
This problem is a Panhandle problem as per 8 FAC 1.
Methane has a SG of 0.56 and a z of ~ 0.9 for these conditions. The water vapor of 6 lbm/MMSCF is small (sales quality for many places) so should not overly effect the Panhandle equation result of ~240 MMSCF of sales quality gas. Next, we divide by 6 for ~40 MBOE. Again, the water content is sales quality so the BOE calculation should hold within the answer the answer key margins.
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