PETE 216 1RESERVOIR ROCK AND FLUID PROPERTIES

PETE 216Reservoir Rock and Fluid Properties

Fall 2006-2007

Dr. Mahmut Parlaktuna

CONVENTIONAL PVT MEASUREMENTS

PETE 216 2RESERVOIR ROCK AND FLUID PROPERTIES

STANDARD PVT TESTSCompositional Analysis (CA)Multistage Separation (MSS)Constant Composition Expansion (CCE) (Flash vaporization test)Differential Liberation Expansion (DLE) (Differential vaporization test)Constant Volume Depletion (CVD)

PETE 216 3RESERVOIR ROCK AND FLUID PROPERTIES

PETE 216 4RESERVOIR ROCK AND FLUID PROPERTIES

OIL PVT ANALYSES Bottomhole wellstream compositional

analysis through C7+,

CCE DLE MSS

PETE 216 5RESERVOIR ROCK AND FLUID PROPERTIES

COMPOSITIONAL ANALYSIS

GAS CHROMATOGRAPHY (GC)

LIQUID CHROMATOGRAPHY (LC)

PETE 216 6RESERVOIR ROCK AND FLUID PROPERTIES

PETE 216 7RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition Expansion

PETE 216 8RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition Expansion

PETE 216 9RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition ExpansionPressure (psig) Relative Volume Y Function Density (g/cm3)

5000 0.9639   0.6808

4500 0.9702   0.6763

4100 0.9756   0.6726

4000 0.9770   0.6716

3500 0.9845   0.6665

3000 0.9928   0.6609

2900 0.9946   0.6597

2800 0.9964   0.6585

2700 0.9984   0.6572

2620 1.0000   0.6562

2605 1.0021    

2591 1.0042    

2516 1.0157    

2401 1.0353    

2253 1.0648 2.497  

2090 1.1041 2.418  

1897 1.1627 2.325  

1698 1.2415 2.229  

1477 1.3611 2.122  

1292 1.5000 2.033  

1040 1.7839 1.911  

830 2.1709 1.810  

640 2.7603 1.718  

472 3.6961 1.637  

PETE 216 10RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition Expansion

0

1000

2000

3000

4000

5000

6000

0.8 1.0 1.2 1.4 1.6 1.8 2.0

Relative Volume

Pres

sure

(ps

ig)

Bubble point

Pb

PETE 216 11RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition Expansion

oT

1 Vc =-

V P

Above bubblepoint

PETE 216 12RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition Expansion

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

0 500 1000 1500 2000 2500

Pressure (psig)

Y f

unct

ion

b

t b

b

P -P

PY=

V -V

V

PETE 216 13RESERVOIR ROCK AND FLUID PROPERTIES

Differential Liberation Expansion

scRg

sc sc

PV TB = =Z

V T P

PETE 216 14RESERVOIR ROCK AND FLUID PROPERTIES

Differential Liberation Expansion

Pressure (psig)

Rsd

(SCF/bbl)1

Rsd

(vol/vol)1Bod

2 Btd3 Oil density

(g/cm3)Z Bg

4 Incremental gas gravity

2620 854 152 1.600 1.600 0.6562      

2350 763 136 1.554 1.665 0.6655 0.846 0.00685 0.825

2100 683 122 1.515 1.748 0.6731 0.851 0.00771 0.818

1850 612 109 1.479 1.859 0.6808 0.859 0.00882 0.797

1600 544 97 1.445 2.016 0.6889 0.872 0.01034 0.791

1350 479 85 1.412 2.244 0.6969 0.887 0.01245 0.794

1100 416 74 1.382 2.593 0.7044 0.903 0.01552 0.809

850 354 63 1.351 3.169 0.7121 0.922 0.02042 0.831

600 292 52 1.320 4.254 0.7198 0.941 0.02931 0.881

350 223 40 1.283 6.975 0.7291 0.965 0.05065 0.988

159 157 28 1.244 14.693 0.7382 0.984 0.10834 1.213

0 0 0 1.075   0.7892     2.039

Gravity of residual oil = 35.1 °API @ 60 °F1 Volume of gas at the standard conditions per volume of residual oil.2 Volume of oil at indicated pressure and temperature per volume of oil at the standard conditions.3 Volume of oil plus liberated gas at indicated pressure and temperature per volume of residual oil at the standard conditions.4 Volume of gas at indicated pressure and temperature per volume at the standard conditions.

PETE 216 15RESERVOIR ROCK AND FLUID PROPERTIES

Multistage Separation Test

PETE 216 16RESERVOIR ROCK AND FLUID PROPERTIES

Multistage Separation Test

Separator Pressure (psig)

Gas oil ratio (SCF/bbl)1

Gas oil ratio (SCF/STB)2

Stock-tank oil gravity (°API at 60 °F)

Formation Volume factor

(vol/vol)3

Separator volume factor

(vol/vol)4

Specific gravity of

flashed gas

50 to 0715 737     1.031 0.840

41 41 40.5 1.481 1.007 1.338

100 to 0637 676     1.062 0.786

91 92 40.7 1.474 1.007 1.363

200 to 0542 602     1.112 0.732

177 178 40.4 1.483 1.007 1.329

300 to 0478 549     1.148 0.704

245 246 40.1 1.495 1.007 1.286

1 GOR per barrel of oil at indicated pressure and temperature.2 GOR per barrel of stock-tank oil at 60 °F.3 FVF per barrel of stock-tank oil at 60 °F.4 Separator oil volume factor per barrel of stock-tank oil at 60 °F.

PETE 216 17RESERVOIR ROCK AND FLUID PROPERTIES

Multistage Separation Test

760

765

770

775

780

785

790

795

800

0 50 100 150 200 250 300 350

Pressure (psig)

GO

R (

SC

F/S

TB

)

1.450

1.455

1.460

1.465

1.470

1.475

1.480

1.485

1.490

1.495

1.500

Oil

FV

F (

vol/v

ol)

GOR (SCF/STB)

FVF

40.0

40.1

40.2

40.3

40.4

40.5

40.6

40.7

40.8

40.9

41.0

0 50 100 150 200 250 300 350

Pressure (psig)

Sto

ck-t

ank

oil g

ravi

ty (

°AP

I)

Oil gravity

PETE 216 18RESERVOIR ROCK AND FLUID PROPERTIES

GAS CONDENSATE PVT ANALYSES Recombined Wellstream Compositional Analysis

(CA) Constant Composition Expansion (CCE) (Flash

vaporization test) Constant Volume Depletion (CVD)

PETE 216 19RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition ExpansionPressure (psig) Relative volume (V/Vsat)

3 Z4 Volume of Retrograde liquid (%)5

7975 0.9395 1.2866 0.00

7540 0.9599 1.2429 0.00

7250 0.9765 1.2158 0.00

71831 0.9787 1.2074 0.00

7105 0.9826 1.1991 0.00

6960 0.9935 1.1876 0.00

68222 1.0000 1.1718 0.00

6743 1.0068 1.1660 0.30

6598 1.0174 1.1530 0.82

6380 1.0312 1.1302 1.73

6090 1.0550 1.1039 2.92

5655 1.0971 1.0661 4.79

5075 1.1687 1.0120 7.18

4495 1.2632 0.9764 9.40

3915 1.3959 0.9401 11.02

3335 1.5841 0.9094 12.40

2610 1.9773 0.8894 13.15

1 Initial reservoir pressure2 Saturation pressure at reservoir temperature3 Vsat = volume of fluid at saturation pressure and reservoir temperature4 Z=PV/nRT (n total number of moles)5 (Volume of retrograde liquid at indicated pressure / total volume at saturation pressure)*100

PETE 216 20RESERVOIR ROCK AND FLUID PROPERTIES

Constant Composition Expansion

0.0

0.5

1.0

1.5

2.0

2.5

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

Pressure (psig)

Rel

ativ

e V

olum

e (V

/Vsa

t)

-2

0

2

4

6

8

10

12

14

Liq

uid

volu

me

(%)

Relative volume (V/Vsat)

Volume of Retrograde liquid (%)

PETE 216 21RESERVOIR ROCK AND FLUID PROPERTIES

Constant Volume Depletion

PETE 216 22RESERVOIR ROCK AND FLUID PROPERTIES

Constant Volume Depletion

Pressure (psig) Cumulated production (%)Specific gravity of

produced gasZ

Volume of Retrograde liquid

(%)

7975 0.00 0.943 1.2866 0.00

7540 0.00 0.943 1.2429 0.00

7250 0.00 0.943 1.2158 0.00

7183 0.00 0.943 1.2074 0.00

7105 0.40 0.943 1.1991 0.00

6960 1.51 0.943 1.1876 0.00

6822 2.17 0.943 1.1718 0.00

5800 9.67 0.889 1.0767 4.31

4930 17.66 0.845 1.0056 7.53

3915 29.89 0.797 0.9479 10.18

3045 42.90 0.760 0.9176 11.28

2030 60.29 0.737 0.9171 11.32

1160 76.17 0.728 0.9476 10.49

PETE 216 23RESERVOIR ROCK AND FLUID PROPERTIES

Constant Volume Depletion

0

2

4

6

8

10

12

0 1000 2000 3000 4000 5000 6000 7000 8000

Pressure (psig)

Con

dens

ate

Dro

p-ou

t (%

)

PETE 216 24RESERVOIR ROCK AND FLUID PROPERTIES

Constant Volume Depletion

PETE 216 25RESERVOIR ROCK AND FLUID PROPERTIES

Constant Volume Depletion