GOR Vs GVF

Multi Phase Flow Meter Vendors quote on their specification sheets GVF functional range. What is GVF? Let us understand it. Operations Engineer should have full clarity on GVF - What it is and how it is calculated from the readily known well fluid ope understanding GVF and calculating it from the normally known well fluid operating data and the expected variations. Useful f Vop=Ps*Vs*Zop*Top/(Pop*Zs*Ts)

Most of the Multi Phase Flow Metering specifications require that GVF range is specified. This spreadsheet calculates GVF, from the normally known Flow, GOR & WC data. GVF is gas to total fluids percentage at actual conditions

Temp in Rankine, Pressure, psia Black font is user input RED Font data cells are Std/Calculated.

GAS VOLUME(VOID) FRACTION, GVF - CALCULATION S

Parameter Case/Units

C A S E 1

C A S E

GOR

WC Water Cut

W Water Flow

Liquid (oil+water)

Vg,std, Gas Flow at Standard Conditions

BBLs/DAY

SCF/BBL

%

BWPD

BLPD

SCFD

1000 5000 20000

500 600 1000

70 50 50

2333 5000 20000 0 0 0 0

3333 10000 40000 0 0 0 0

500,000 3,000,000 20,000,000 -

0 0 0 0 0

0 0 0 0 0

-

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

-

O Oil Flow

10000 20000

When liquid & gas flows are given use this row. GOR & WC are not needed

1,700,000 500,000

C A S E 2

When liquid & gas flows are given use this row. GOR & WC are not needed

Gas Volume (void) Fraction (GVF.) Definition: GVF, or gas volume fraction, is defined as the ratio of the gas volumetric flow-rate to the total volumetric flow-rate. The total volumetric flow-rate is the sum of the liquid volumetric rate and the gas volumetric flow-rate. These volumetric flows are usually expressed in actual (not standardized )volumetric terms. Express in either percentage (0-100%) or WC = Water Cut or Percentage Gas Oil Ratio (GOR) is expressed in Standard Cubic Feet of gas per barrel of hydrocarbon liquid crude (SCF/BBL) BWPD = Barrels of Water Per Day BLPD = Barrels of Liquid (Crude+Water) Per Day SCFD = Standard Cubic Feet Per Day

at is GVF? Let us understand it. Needless to say, before MPFMs selection the specifying he readily known well fluid operating data of Water Cut, GOR and flows. This spreadsheet readily helps Operating Engineer in he expected variations. Useful for reviewing and specifying the GVF range while ordering the MPFMs. 1 2 3 4 5

e Std/Calculated.

Case 1 = When Oil Flow, Water cut and GOR are given Case 2= When Standard oil, water and Gas Flows are given. GOR & WC Not necessary. Go Any one row is enough for a condition, table can be used to find a range of GVF by varyin Variation in liquid volumes at Standard and actual conditions is taken as negligible Input Zop & Zs values correctly by using the other worksheet. Refer other worksheet tit Z values are also dependent on the compositions of N2, CO2 & H2S use other worksheet

ION, GVF - CALCULATION SPREADSHEET FROM UPSTREAM WELL DATA - P, T, OIL FLOW, WATER CUT & GOR

Vg,op= G Gas Flow at Operating Conditions

Ps Pressure Std

Ts Temp Std

Zs Comp Factor

Pop Operating Pressure

Top Operating Temp

Zop Comp Factor

PSIA

Rankine

No.

PSIA

Rankine

No.

14.7 14.7 14.7 14.7 14.7 14.7 14.7

520 520 520 520 520 520 520

0.9987 0.9987 0.9987

100 200 300

600 700 800

0.9937 0.9927 0.9948

14.7 14.7 14.7 14.7 14.7

520 520 520 520 520

#DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!

14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7

520 520 520 520 520 520 520 520 520 520

#DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!

14.7 14.7 14.7

520 520 520

1 1

100 200

600 700

0.9937 0.9927

G, in Ft3/Day 84,383 295,044 1,501,805 #DIV/0! #DIV/0! #DIV/0! #DIV/0!

286,530 49,110 #DIV/0!

14.7 14.7

520 520

volumetric flow-rate. ow-rate. These n either percentage (0-100%) or corresponding Fraction (0.0 to 1.0) as needed.

crude (SCF/BBL)

#DIV/0! #DIV/0!

s Operating Engineer in

given. GOR & WC Not necessary. Go to Row for case-2 for GVF calculation. sed to find a range of GVF by varying oil, water cut, GOR or flows. nditions is taken as negligible rksheet. Refer other worksheet titled "Z Calculation" in this file 2, CO2 & H2S use other worksheet to correctly input Z values.

W, WATER CUT & GOR

Vg,op= G Gas Flow at Operating Conditions G, in BPD 15,028 52,546 267,463 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! 51,029 8,746 #DIV/0!

GAS+OIL+WATER Total Liquid Flow at Operating Conditions BLPD

GAS VOLUME(VOID) FRACTION= 100*G/(G+O+W) GVF in %

18,361 62,546 307,463 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!

81.85 84.01 86.99 #DIV/0! #DIV/0! #DIV/0! #DIV/0!

61,029 28,746

83.61 30.43 #DIV/0!

#DIV/0!

#DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!

#DIV/0! #DIV/0!

#DIV/0! #DIV/0!

#DIV/0! #DIV/0!

Description: This spreadsheet calculates gas compressibility factor based on Brill and Beggs correlation. Instruction: 1) Select a unit system; 2) Update data in the Input Data section;

3) Review result in the Solution section. 1

0

14.7 psia

30 MPa

Input Data:

Pressure: Temperature: Gas specific gravity: Mole fraction of N2: Mole fraction of CO2: Mole fraction of H2S:

60 F 0.65 air = 1 0.1

100 C 0.65 air = 1 0.1

0.08

0.08

0.02

0.02

Solution:

Pseudocritical pressure = Pseudocritical temperature = Pseudo-reduced pressure = Pseudo-reduced temperature = A= B= C= D= Gas compressibility factor z =

697 psia 345 R 0.02 1.60 0.4684 0.0053 0.0668 0.9849 0.9987

4.74 MPa 191.53 K 0.02 1.60 0.4684 0.0053 0.0668 0.9849 0.9987

Reference: Brill-Beggs-Z.xls http://petroleumsupport.com/brill-beggs-z/

14.7 psia 92 F 0.65 1 for air 0.1 0.08 0.02