 Home
Equations Layer Data Input

A : Reservoir Pattern Area , acres
 h net :
Average formation layer thickness , ft.
 f :
Average Porosity , fraction
 S o :
Oil Saturation @ start of flood , fraction
 B o :
Oil formation volume factor @ start of flood , RB / STB
 B w :
Water formation volume factor @ start of flood, RB / STB
 S wi :
Initial water saturation ; fraction
 m o :
Oil viscosity , cp
 m w :
Water viscosity , cp
 rei :
1/2 the distance between adjacent injectors, ft.'
 rw :
Well radius , ft.
 d :
Distance between adjacent rows of wells , ft.
 K
Absolute Permeability - Base permeability is permeability to oil at irreducible water saturation , (Ko ) @ Swi.
 D P
Pressure difference beween formation face injection pressure and pressure @ the leading edge of the oil bank in the reservoir , psig
Relative
Permeability
Data:
User manually inputs relative permeability data or can use default algorithm

Program Internal Auto Calculations

 Calculations of the Fractional Flow Curve Calculations of the Derivative of the Fractional Flow Curve M : Program calculates mobility ratio prior to water breakthrough utilizing the fractional flow curve Eabt : Program calculates the areal sweep efficiency at water breakthrough using Figure E.6 Sg* : Program calculates maximum gas saturation, Sg*, for which the CGM method is valid Sg* : C * (Soi-Sobt ) figure E.7 Sobt Program calculates the average oil saturation in the swept zone at water breakthrough Test Program tests validity of program by comparing calculated Sg, the current gas saturation at flood start to Sg* The condition Sg < Sg* must be met for calculations to be performed

RESULTS: INITIAL CALCULATIONS

 Initial injection into the pattern assumes that the fluid banks are radial in shape and that Darcy's radial flow equation applies. Equation Permission Granted by the Society of Petroleum Engineers SPE, Dallas, Texas The Reservoir Engineering Aspects of Waterflooding Monograph Volume 3 Vp Reservoir Pattern Pore Volume 7,778 * A * hnet * f bbls Nwf Reservoir Pattern Stock Tank Oil in Place @ start of flood ( Vp*So ) / Bo STB M Mobility ratio calculated by program prior to water breakthrough [(Krw) Swbt  * mo ] / [ mw * (Kro)Swi ] Eabt Areal sweep efficiency calculated by program at water breakthrough From : M vs. Conductance Ratio Graph Wii Cumulative water injected @ interference ( p * hnet * f * Sg * rei2 ) / 5.615 bbls Wif Cumulative water injected @ fillup Vp * Sg bbls Wibt Cumulative water injected @ breakthrough Vp * Eabt * (Swbt  - Swi) bbls

RESULTS: RELATIVE PERMEABILITY DATA RESULTS: DERIVATIVE OF THE FRACTIONAL FLOW CURVE RESULTS: PERFORMANCE TO INTERFERENCE RESULTS: PERFORMANCE TO FILLUP RESULTS: PERFORMANCE FROM FILLUP TO WATER BREAKTHROUGH RESULTS: PERFORMANCE FROM FILLUP BREAKTHROUGH TO FLOODOUT

Global View Top Grid Middle Grid Bottom Grid 