Assessing Technical and Economic Recovery of Oil Resources

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The initial forecasts of oil response for these three projects were hampered by a lackof analog floods by which to make experience based predictions, necessitating analmost complete reliance on computer simulations. The match of expected oilresponse to actual oil production, as observed in Figures 19 through 21, has beenexemplary and is a tribute to the foresightedness of the reservoir teams.3. Oxy Permian’s Bennet Ranch Unit. Shell’s confidence in the economic viability offlooding the transition zone was further demonstrated in 1995 with plans forimplementation of the Bennett Ranch Unit CO 2 flood 10 . The original plan called fordeepening the injection and production wells to include 75 feet of the TZ/ROZ,making it the first CO 2 flood that would include both the MPZ and the TZ/ROZ in theoriginal CO 2 flood. However, due to low oil prices, the wells were not deepened andonly the MPZ was flooded in the initial implementation. In late 2003, Oxy Permiandeepened wells into the TZ/ROZ, and this resource was added to the overall CO 2flood. Today, about half of the CO 2 flooded patterns are being co-developed in theMPZ and TZ/ROZ. Figure 22, Bennett Ranch Unit CO 2 Flood Response (ShellForecast of 6-95), presents a look at the initial forecast of oil production for the 8 and32 pattern CO 2 floods. Figure 23, Bennett Ranch Unit (Wasson Field) OilResponse, presents the oil production results at the Bennett Ranch Unit Project.The figure clearly shows increased oil production after the TZ/ROZ reservoir intervalwas added in 2003. Additional ROZ development at the Bennett Ranch Unit is beingplanned.10 Shell Western E&P, Inc. Field Briefing Materials upon the Implementation of the Bennett Ranch CO 2Flood, June 1995.3-7 February 2006
Figure 22. Bennett Ranch Unit CO2 Flood Response (Shell Forecast of 6-95)14,000Bennett Ranch Unit Production12,00010,000Baseline WF Oil ProjectionWF PROJActual OIL Oil - BPD ProductionOil Production - BOPD8,0006,0004,0002,000-Jan-70Jan-73Jan-76Jan-79Jan-82Jan-85Jan-88Jan-91Jan-94Jan-97Jan-00Jan-03Jan-06Jan-09Jan-12Jan-15Jan-18Month-YrFigure 23. Bennett Ranch Unit (Wasson Field) Oil Response3-8 February 2006
Page 1 and 2: ASSESSING TECHNICAL AND ECONOMICREC
Page 3: ASSESSING TECHNICAL AND ECONOMIC RE
Page 6 and 7: EXECUTIVE SUMMARYOur first study,
Page 8 and 9: have favorable TZ/ROZ characteristi
Page 10 and 11: 8. The technically recoverable ROZ/
Page 12 and 13: When conducted simultaneously, each
Page 14 and 15: saturation left after waterflooding
Page 16 and 17: 4800Oil Saturation %100 04850490049
Page 18 and 19: WEOil TrapROZROZProducingOWCBase of
Page 20 and 21: WEOil TrapROZROZProducingOWCBase of
Page 22 and 23: 5,400 5,300 5,200 5,100 5,0006,000
Page 24 and 25: 6,000 5,900 5,800 5,700 5,600 5,500
Page 26 and 27: C. Evidence for ROZs in the Permian
Page 28 and 29: III. EVALUATING OIL RECOVERY FROM R
Page 30 and 31: Estimates of MPZ and ROZ oil produc
Page 32 and 33: Producing OWCAdapted from Oxy Permi
Page 36 and 37: B. Sample ROZ Oil Fields. Five majo
Page 38 and 39: Basin Name Permian West Texas 8A15
Page 40 and 41: Seminole San Andres Unit Production
Page 42 and 43: Basin Name Permian West Texas 8A19
Page 44 and 45: Basin Name Permian East New Mexico4
Page 46 and 47: IV. CALIBRATING THE OIL RECOVERY MO
Page 48 and 49: PROPHET input file to account for t
Page 50 and 51: 1,400Reservoir Simulation1,200Proph
Page 52 and 53: Table 3. Technical Oil Recovery Tot
Page 54 and 55: the full TZ in the TZ/ROZ CO 2 -EOR
Page 56 and 57: • Methodology. Reservoir simulati
Page 58 and 59: Development of the reservoir starte
Page 60 and 61: VI. ECONOMICALLY RECOVERABLE OILRES
Page 62 and 63: • Finally, the largest single cos
Page 64 and 65: These 1.4 billion barrels of oil re
Page 66 and 67: APPENDIX AOIL IN-PLACE FOR THE TZ A
Page 68 and 69: Table A-1. Key Inputs for Calculati
Page 70 and 71: ADJUSTING THE ROZ OIL IN-PLACE VALU
Page 72 and 73: APPENDIX CECONOMIC ANALYSES OF FIVE
Page 74 and 75: Field Cashflow Model Pattern FieldS
Page 76 and 77: Field Cashflow ModelStateFieldForma
Page 78 and 79: BasinFieldFormationTechnology CaseD
Page 84 and 85:
Field Cashflow Model Pattern FieldS
Page 86 and 87:
Field Cashflow ModelStateFieldForma
Page 88 and 89:
BasinFieldFormationTechnology CaseD
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Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
BasinFieldFormationTechnology CaseD
Page 100 and 101:
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