Fluid, Fluid Flow & Rock Data

- Relative Permeability & Capillary Pressure
- K
_{rw}/K_{ro}vs Sw data available on 5 core plugs - K
_{ro}/ S_{w}& K_{rw}/ S_{w}generated for Moore D1 -*used in initial simulation* - to obtain production match - end points & curve shape modified
- capillary pressure test data available on 18 core plugs
- Swir obtained from relative permeability curves
- representative capillary pressure curve - shows asymptotic rise near Swir
- PVT data
**solution GOR, oil API gravity & reservoir temperature**- production data – insignificant gas production- assumptions
- solution gas-oil-ratio = 50 cu. ft/bbl
- gas gravity = 0.7 (air = 1)

- average API tank gravity of the oil = 40 degrees
- average reservoir temperature = 115
^{o}f.

- assumptions
**bubble point pressure**- bubble point pressure = 225 psia- Standing's Correlation in
*Petroleum Production Handbook* - depth corresponding to bubble point pressure = 2100 ft

- Standing's Correlation in
- bubble point pressure gradient = 0

pbo | pbodat | pbgrad | <===bubble point pressure | |||

225 | 2100 | 0 | ||||

vslope | bslope | rslope | pmax | reprs | <== slope oil vis, Bo above bubble point pressure, max pressure, turn off for repressuring algorithm (valid for undersaturated oil) | |

.000495 | -.000005 | 0 | 2000 | 1 |

**oil viscosity**- dead oil viscosity @ 14.7psi & reservoir temperature = 2.5 cp
- oil viscosity @ bubble point pressure = 1.95 cp
- slope of oil viscosity above bubble point = .000495 cp/psi
- estimation of oil viscosity in
*Properties of Petroleum Fluids*

**oil formation volume factor (Bo)**- @ Bubble Point = 1.037 RB/STB
- Slope of Bo above bubble point = -.000005 RB/(STB.psi)
- estimation of Bo in
*Properties of Petroleum Fluids*

**water viscosity & formation volume factor**- average total dissolved solids of 30,000 ppm- water viscosity = 0.65 cp @ atmospheric pressure
- corrected @ different pressures above bubble point
- estimation of water viscosity in
*Properties of Petroleum Fluids*

p | muo | bo | rso | <== oil viscosity, saturated oil formation, saturated oil solution gas oil ratio at different pressures | |||||

14.7 | 2.5 | 1 | 1 | ||||||

225 | 1.95 | 1.037 | 50 | ||||||

500 | 1.98 | 1.036 | 50 | ||||||

1000 | 2.1 | 1.033 | 50 | ||||||

2000 | 2.8 | 1.028 | 50 |

p | muw | bw | rsw | <== water viscosity, water formation, water solution gas oil ratio
at different pressures solubility of gas in water neglected in black oil simulation (rsw = 0) | |||||

14.7 | .650 | 1.0120 | 0 | ||||||

225 | .655 | 1.0120 | 0 | ||||||

500 | .660 | 1.0120 | 0 | ||||||

1000 | .665 | 1.0117 | 0 | ||||||

2000 | .680 | 1.0100 | 0 |

**gas properties**- gas viscosity = .0108 cp @ 14.7 psia & reservoir temperature
- gas viscosity at pressures above atmospheric pressure
- use pseudo reduced pressure & pseudo reduced temperature
- read viscosity ratio from cross plot
- calculate gas viscosity from ratio

- estimate pseudocritical properties of gas
- calculate pseudoreduced properties of gas
- calculate Z-Factor
- calculate Bg @ different pressures

- estimation of gas viscosity and Bg in
*Properties of Petroleum Fluids*

0 | (0) read gas & rock properties table, (1) activate gas correlation & read gas & rock properties table | ||||||||

p | mug | bg | psi | cr | pressure (p), gas viscosity (mug), gas frmn vol factor (bg), gas pseudo pressure (psi), rock compressibility (cr) | ||||

14.7 | .0108 | .196 | 0.0 | .0000038 | |||||

225 | .011 | .0123 | 0.0 | .0000038 | |||||

500 | .0113 | .0054 | 0.0 | .0000038 | |||||

1000 | .0124 | .0025 | 0.0 | .0000038 | |||||

2000 | .0162 | .0011 | 0.0 | .0000038 |

**rock compressibility**- average reservoir porosity = 17.5%
- effective rock compressibility = 3.8*10
^{-6}psi^{-1}- read effective rock compressibility from cross plot

- estimate rock compressibility in
*Petroleum Reservoir Engineering*

**stock tank properties of oil, gas and water**- convert API gravity to specific gravity -
*Density of oil = 51.46 lb/cu. ft* - specific gravity of water with 30,000ppm = 1.035 -
*Density of water = 64.55 lb/cu. ft* - specific gravity of gas = .7 -
*Density of air @ STP = .0764 lbs/cuft, Density of gas = 0.0535 lb/cu. ft* - calculation of properties in
*Properties of Petroleum Fluids*

- convert API gravity to specific gravity -

rhosco | rhoscw | rhoscg | oil (rhosco), water (rhoscw), gas density (rhoscg) | ||||||

51.46 | 64.55 | .0535 |

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Updated January 1999

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