Page 126 - Petroleum and Gas Field Processing

(b) Carryover
(c) Better separation in the gravity settling section
(d) Entrapment of foam in the oil
II. Accumulation of produced sand in the separator may
(a) Result in incomplete separation of oil and gas
(b) Be better handled in horizontal separators
(c) Reduce the gas capacity of the separator
(d) Reduce the liquid (oil) capacity of the separator
8. Derive the equations for gas capacity and oil capacity constraints for
a horizontal separator for the following two cases:

(a) The gas occupies 75% of the separator effective volume.
(b) The gas occupies 25% of the separator effective volume.

9. The following data are given for a small oil field:
Oil rate: 8000 bbl/day
Gas–oil ratio: 1200 SCF/bbl
Operating pressure: 500 psia
Operating temperature: 80 F

Oil gravity: 35 API

Gas specific gravity: 0.6
Oil viscosity: 10 cP
Oil retention time: 180 s
(a) Design a horizontal separator to handle the field production.
(b) If the field is located offshore, design the appropriate
separator to handle to field production.
(c) Determine the actual capacity of a horizontal two-phase
separator having a 60 in. diameter and 15 ft seam-to-seam
length for the above operating conditions.
10. Determine the actual gas and oil capacities for vertical and horizontal
separators having a 48-in. diameter and 16-ft seam-to-seam length,
operating at 585 psi and 80 F, given the following data:

Oil specific gravity: 0.875
Gas specific gravity: 0.6
Oil viscosity: 5.0 cP
Operating pressure: 700 psia

Operating temperature: 80 F
Oil retention time: 120 s

Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved.