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LECTURE 10

FEB 18, 2013

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Quiz # 1 (2/18/2013)

List five reasons why Horizontal Gas/Oil

separators are preferred over Verticalones in the field.

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Homework #3 (Due on 2/25/2013)

Specify the pipe size for a 2-phase flow line for thefollowing gas/condensate flow stream:

Gas flow rate: 60 MMscfd

Condensate flow rate: 45 bbl/ MMscf

Sp. Gr. of gas: 0.7

Sp. Gr. of condensate: 0.75

Flowing Pr. : 1500 psig

Flowing Temp: 100o F

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Three Phase Horizontal Separator - 1

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Three Phase Horizontal Separator - 2

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Water Washing

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Oil Water Layers

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H

H

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Three Phase Vertical Separator

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Three Phase Vertical Separator Size

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Solution

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Solution (Contd.)

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Solution (Contd.)

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Alternate Solution Method

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Minimum Mechanical EQUIREMENTS:

Ag must be 1/3 of Avessel

Ao must be 1/3 of Avessel

Aw must be 1/6 of Avessel

AD must be 1/6 of Avessel

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Ag = 12.8 ft2 ( Calculated value = 1.33 ft2) 9.42 sq. ft. 11.4 sq. ft.

Ao = 12.8 ft2 ( Calculated value = 9.74 ft2) 9.42 sq. ft. 11.4 sq. ft.

Aw = 6.4 ft2 ( Calculated value = 5.84 ft2) 4.71 sq. ft. 5.7 sq. ft.

AD = 6.4 ft2 4.71 sq. ft. 5.7 sq. ft.

For Vessel diameter = 7 ft. or 72 in., c.s. area = 38.5 sq. ft.

For Vessel diameter = 6 ft. or 72 in., c.s. area = 28.27 sq. ft.For Vessel diameter = 6.6 ft. or 78 in., c.s. area = 34.21 sq. ft.

VESSEL SIZE REQUIRED :

AVessel = Ag + Ao + Aw + AD = 11.4 + 11.4 + 5.7 + 5.7

AVessel = 34.2 ft2

DVessel = (34.2/0.785)0.5

Dvessel = 78 inches or 6.5 feet

The selected vessel is now 78 inches x 20 feet S/S, Compared to original vertical

vessel size of 90 ID x 20 S/S.

Minimum Mechanical Dimensions:

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Homework #4 (Due on 2/25/2013)

Size a 3-phase Horizontal separator given the followingdesign conditions:

Oil flow rate: 18000 B/D

Water flow rate = 8000 B/D

GOR: 4000 SCF/STB Oil S.G. = 0.90

Gas S.G. = 0.75

Pressure = 650 psig

T = 95o F

Oil retention time = 8 minutes

Water retention time = 3 minutes

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Horizontal Gas Scrubber

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Dvessel = 3.72 ft. (44.7 inches)

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Because of the small liquid volume, we select a

sump/boot at the end of the vessel to handle the

liquid. Lets use 12 sump

The liquid height in sump

This height is not practical to work with, so we

select 18 inches liquid height in a 36 inches highsump.

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Overall vessel size is 48 OD x 10 S/S with 12 OD x 36Sump (Height of boot is from bottom of the vessel to the

bottom head seam of the boot)

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Scrubber Diameter (inches) Minimum Length (ft)

Up to 30" 5'-0"36" - 42" 7'-6"

48" - 60" 10'-0"

66" - 78" 15'-0"

84" - 96" 20'-0"102" - 120" 25'-0"

126" - 144" 30'-0"