GOR Vs GVF

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understanding GVF and calculating it from the normally known well fluid operating data and the expected variations. Useful for reviewing and specifying the GVF range while ordering the MPFMs.

Vop=Ps*Vs*Zop*Top/(Pop*Zs*Ts) Temp in Rankine, Pressure, psia Black font is user input

RED Font data cells are Std/Calculated.

Parameter O

Oil Flow GOR

WC Water Cut W Water Flow Liquid (oil+water) Vg,std, Gas Flow at Standard Conditions Case/Units BBLs/DAY SCF/BBL % BWPD BLPD SCFD 1000 500 70 2333 3333 500,000 5000 600 50 5000 10000 3,000,000 20000 1000 50 20000 40000 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 -0 0 -0 0 -0 0 -0 0 -10000 1,700,000 20000 500,000 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

GAS VOLUME(VOID) FRACTION, GVF - CALCULATION SPREADSHEET FROM UPSTREAM WELL DATA - P, T, OIL FLOW, WATER CUT & GOR

C

A

S

E

1 When liquid & gas flows are given use this row.

GOR & WC are not needed

C

A

S

E

2

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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 corresponding Fraction (0.0 to 1.0) as needed. 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

When liquid & gas flows are given use this row.

GOR & WC are not needed

C

A

S

E

2

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understanding GVF and calculating it from the normally known well fluid operating data and the expected variations. Useful for reviewing and specifying the GVF range while ordering the MPFMs.

1 Case 1 = When Oil Flow, Water cut and GOR are given

2 Case 2= When Standard oil, water and Gas Flows are given. GOR & WC Not necessary. Go to Row for case-2 for GVF calculation. 3 Any one row is enough for a condition, table can be used to find a range of GVF by varying oil, water cut, GOR or flows.

RED Font data cells are Std/Calculated. 4 Variation in liquid volumes at Standard and actual conditions is taken as negligible

5 Input Zop & Zs values correctly by using the other worksheet. Refer other worksheet titled "Z Calculation" in this file Z values are also dependent on the compositions of N2, CO2 & H2S use other worksheet to correctly input Z values.

Ps Pressure Std Ts Temp Std Zs Comp Factor Pop Operating Pressure Top Operating Temp Zop Comp Factor

PSIA Rankine No. PSIA Rankine No. G, in Ft3/Day

14.7 520 0.9987 100 600 0.9937 84,383 14.7 520 0.9987 200 700 0.9927 295,044 14.7 520 0.9987 300 800 0.9948 1,501,805 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 #DIV/0! 14.7 520 1 100 600 0.9937 286,530 14.7 520 1 200 700 0.9927 49,110 14.7 520 #DIV/0!

GAS VOLUME(VOID) FRACTION, GVF - CALCULATION SPREADSHEET FROM UPSTREAM WELL DATA - P, T, OIL FLOW, WATER CUT & GOR Vg,op= G

Gas Flow at Operating Conditions

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14.7 520 #DIV/0!

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 corresponding Fraction (0.0 to 1.0) as needed.

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Case 2= When Standard oil, water and Gas Flows are given. GOR & WC Not necessary. Go to Row for case-2 for GVF calculation. Any one row is enough for a condition, table can be used to find a range of GVF by varying oil, water cut, GOR or flows.

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 titled "Z Calculation" in this file Z values are also dependent on the compositions of N2, CO2 & H2S use other worksheet to correctly input Z values.

GAS+OIL+WATER Total Liquid Flow at Operating Conditions GAS VOLUME(VOID) FRACTION= 100*G/(G+O+W) G, in BPD BLPD GVF in % 15,028 18,361 81.85 52,546 62,546 84.01 267,463 307,463 86.99

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

51,029

61,029 83.61 8,746

28,746 30.43

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

GAS VOLUME(VOID) FRACTION, GVF - CALCULATION SPREADSHEET FROM UPSTREAM WELL DATA - P, T, OIL FLOW, WATER CUT & GOR Vg,op= G

Gas Flow at Operating Conditions

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

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1 0

Pressure: 14.7 psia 30 MPa

Temperature: 60 F 100 C

Gas specific gravity: 0.65 air = 1 0.65 air = 1

Mole fraction of N2: 0.1 0.1

Mole fraction of CO2: 0.08 0.08

Mole fraction of H2S: 0.02 0.02

Pseudocritical pressure = 697 psia 4.74 MPa Pseudocritical temperature = 345 R 191.53 K Pseudo-reduced pressure = 0.02 0.02 Pseudo-reduced temperature = 1.60 1.60 A = 0.4684 0.4684 B = 0.0053 0.0053 C = 0.0668 0.0668 D = 0.9849 0.9849

Gas compressibility factor z = 0.9987 0.9987

Reference: Brill-Beggs-Z.xls http://petroleumsupport.com/brill-beggs-z/ Instruction: 1) Select a unit system; 2) Update data in the Input Data section; 3) Review result in the Solution section.

Input Data:

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14.7 psia 92 F 0.65 1 for air 0.1 0.08 0.02