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The Reservoir ToolKit
Log
Calculations
 LOG, LOGND, LOGSN
 Calculates water saturation from the Archie equation with cross plot
calculations.
 RWSAL
 Formation water salinity and resistivity.
 SWPOR
 Water saturation from SP and porosity.
 SWPORSS
 Water saturation for shaly sands.
Pressure
Buildups
 BUOIL, BUGAS
 Reservoir permeability and skin damage of a well utilizing buildup
pressure data. PTA  Horner and other plots of pressure buildup data used
to determine the slope, P 1hr and P*.
Fluid
Properties
 CWCALC
 Compressibility of water.
 FORMCOMP
 Formation compressibility for over pressured reservoirs. GASCOMP  Gas
compositional analysis.
 GASPROP
 Gas compressibility factor, calculates gas gravity as corrected for
condensate yields.
 GASVIS,
H2OVIS, OILVIS  Calculate viscosities.
 PBP
 Bubble point pressure.
 GOR
 Gasoil ratio for gas condensate reservoirs.
Volumetric
and Material Balance Calculations
 BHP_CUM
 Gas in place and recoverable reserves from cumulative gas production and
pressures.
 BHP_OVER
 BHP/Z vs cum plot for over pressured reservoirs.
 BHPTIME
 Plots bottom hole pressures vs time.
 GASMBE  Gas material balance.
 GASVOL
 Calculates volumetrics and recoverable reserves for a gas well.
 OILMBE
 Oil material balance calculations with water influx and gas cap.
 OOIP
 Calculates original oil in place from oil properties and reservoir
properties.
Production
Calculations
 CUMCURVE
 Cum gas and oil versus rate plot.
 DECLINE
 Exponential decline calculation.
 PROD
 Monthly production data and semilog plot rate vs time.
Four Point
Calculations
 1POINT
 Gas well AOF with one test point and the slope from the four point
test.
 4POINT,
4POINT3  Calculate absolute open flow and slope from four point
tests for a gas well.
Darcy Flow
Calculations
 DARCY,
DARCY2, DARCY3  Expected gas rate for initial reservoir, gas
properties and pressures.
 DARCYW,
DARCYO  Darcy radial flow equations for water and oil.
Inflow
Calculations
 GASDEL
 New flow rate with a change in surface flowing pressure.
 INFLOW
 A plot of bottom hole flowing pressures for different tubing pressures and
gas rates.
 PSEUDO
 Gas deliverability using the pseudo pressure equations.
 VOGELIPR
 IPR values and curve using the Vogel method.
Bottomhole
and Pressure Drop Calculations
 OILFLOW,
GASFLOW, H2OFLOW  Pressure drops of fluids flowing in
pipe.
 BHPWHP
 . Bottom hole calculation for gas wells from shutin pressures for either
a flowing or shutin gas well.
 PWF_LIQ
 Flowing bottom hole pressures for a gas well with oil and water
production.
 DEEPPWF
 Cullender/Smith method for calculating the bottomhole pressure for wells
greater than 12,000 feet;
Waterflood
Calculations
 CRAIGWF
 Produces relative permeability curve and calculates the oil recovery at
different water cuts using the Craig method.
 CUTCUM  Predicts future performance
with the option to change future fluid withdrawal rates.
 H2O_INJ
 Injection rates in a waterflood well for different waterflood
patterns.
 OILPERM
 Oil well permeability using three producing rates and flowing pressures.
 PERMVAR
 Permeability variance factor.
 RECOVERY
 GuthrieGreenberger equation to estimate an oil recovery factor.
 RELPERM  The Wyllie equation to
calculate the relative permeability curves for oil, gas, and water.
 SWEEP
 Sweep efficiencies for different waterflood injection patterns.
Quick
Economics
 ECONGAS,
ECONOIL, ECONGASD, ECONOILD  A quick economic model that
calculates a present worth profile,
 ROR, DROR,
IRR and payout.
Miscellaneous
Reservoir Calculations
 AFE
 This is a drilling AFE form.
 APIFORE
 API formula for estimated oil recovery factor for a waterflood
field.
 CURVE
 Curve matching of data by linear, exponential, logarithmic, and power
functions.
 DIRSURV1,
DIRSURV2  Well deviation surveys.
 GASLOAD,
LOADUP  Minimum required gas rates needed to lift condensate or
water from the wellbore.
 METRIC  Common EnglishMetric and
MetricEnglish conversions.
 REC_OIL
 API method to calculate oil recovery for a gas drive reservoir.
 SCALE
 Predicts scale formation of oil field fluids.
 SLANT
 Corrected formation thicknesses based on measured values.
Do you have questions about the ToolKit
programs? Please contact us via email, phone, fax, or
postal mail.
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purchase page for pricing and ordering information.
