Assessing Technical and Economic Recovery of Oil Resources

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Estimates of MPZ and ROZ oil production were determined on a well-by-well basis.MPZ oil production dominated initial CO 2 -EOR performance until the ROZ oilresponse caused a significantly improved oil and watercut in 1998, Figure 16, SSAUROZ Phase I Performance: ROZ and MPZ Response. The pilot has clearlydemonstrated the ability to mobilize oil from the ROZ. In response to the success ofthe pilot flood, Amerada Hess has recently begun expanding the capacity of its CO 2processing plant and is planning to expand the ROZ pilot.2. Oxy Permian’s Denver Unit. Shell initiated the first ROZ field pilot in 1991, with a sixpattern CO 2 flood within an area of the Denver Unit called the transition zonesweetspot (TZSS). This is the portion of the Unit where the combination of rockproperties and in-place residual oil provides a favorable oil target. The success ofthe TZSS pilot led to a 21-pattern expansion, with the entire project adopting thename, Transition Zone Sweetspot CO 2 Demonstration Project, Figure 17. As in theinitial pilot areas, the upper 150 feet of the transition/residual oil zone was chosen forCO 2 injection, as shown in Figure 18, Example Log from the Transition Zone Pilot atthe Denver Unit. With the sale of the Denver Unit, OxyPermian became the newoperator of the TZSS Demonstration Project. A series of additional TZ field pilotsand demonstrations followed the initial TZSS CO 2 FLOOD, Figure 17.The incremental oil responses from three of the Denver Unit ROZ pilot anddemonstration projects are further examined: the original TZSS, implemented in1995 (Figure 19); the Phase 1 Area, implemented in July 1997 (Figure 20); and thePhase 2 Area, which was implemented in 2002 (Figure 21). Much like theexperience at SSAU, Oxy Permian has observed a somewhat higher utilization ofCO 2 per barrel of produced oil in the transition zone pilots.3-3 February 2006
1,8001.995BOPD1,6001,4001,2001,000800600400200MPZ onlyMPZ + ROZWatercut Performance (log %wc)1.9901.9851.9801.9751.9701.965Log (% watercut)1.9601.9551.95001.945Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02Figure 16. SSAU ROZ Phase I Performance Separating ROZ and MPZ ResponsePhases to DevelopPhase 7Phase 3Phase 3 TZ Pilot (Pats 3714)Phase 43&6Phase 1Batt 5 TZ Pilot (Pats 7535, 7515)Phase 5TZSSPhase 2Already developedDenver Unit TZPhase 6Figure 17. Denver Unit Transition Zone Map Showing Phased Areas3-4 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 32 and 33: Producing OWCAdapted from Oxy Permi
Page 34 and 35: The initial forecasts of oil respon
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 80 and 81:
Field Cashflow ModelStateFieldForma
Page 82 and 83:
Page 84 and 85:
Field Cashflow Model Pattern FieldS
Page 86 and 87:
Page 88 and 89:
BasinFieldFormationTechnology CaseD
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Page 96 and 97:
Page 98 and 99:
BasinFieldFormationTechnology CaseD
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