Assessing Technical and Economic Recovery of Oil Resources

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B. Sample ROZ Oil Fields. Five major Permian Basin fields were assessedby this study, using reservoir simulation, to estimate the technical and economicfeasibility of recovering oil from the TZ/ROZ. The five fields are all San Andresreservoirs and include the three units already undergoing ROZ field pilots – WassonDenver Unit; Wasson Bennett Ranch Unit; and Seminole San Andres Unit – as well astwo additional reservoirs of special interest – the Vacuum Grayburg/San Andresreservoir in East New Mexico and the Robertson San Andres reservoir in West Texas.The Vacuum Field was selected to illustrate a setting with a very pronouncedOWC tilt (50 ft/mile), implying a large ROZ target in addition to a favorable MPZ. TheRobertson Field was selected to illustrate a setting with a very small MPZ (2 feet of netpay) and a large ROZ (65 feet of net pay) where the TZ/ROZ recovery project couldgreatly expand the field’s ultimate oil recovery. Background information for each of thefive study fields follows.1. Seminole Field, San Andres Unit. The Seminole San Andres Unit is located on thenortheast edge of the Central Basin Platform in Gaines County, Texas, about 60miles NNW of the city of Midland, Figure 24, Geographical and Geological Setting ofthe Wasson and Seminole Fields. The Seminole oil field was discovered in 1936and unitized in 1969. The San Andres Unit of the field covers 15,700 acres and hasan estimated MPZ OOIP of 1,353 MMbbls and a ROZ OIP of 365 MMbbls (refer tonext section for ROZ oil in-place calculation methodology). The MPZ for the Unit isat a depth of 5,100 feet and averages 135 feet in net thickness. The ROZ for theUnit is at a depth of 5,262 feet and has an estimated net thickness of 100 feet,Figure 25, Seminole Field Input Parameters.3-9 February 2006
SeminoleFieldSan Andres ProducingFields and Approximate mid-San Andres PaleogeographyAdapted from Exxon Means Presentation at the 2004 CO2 Conference.Figure 24. Geographical and Geological Setting of the Wassonand Seminole FieldsCurrently, 358 production wells and 184 injection wells are active in the Unit.Cumulative MPZ oil production for the Seminole San Andres Unit is 621 MMbbls.Tertiary CO 2 flooding began in 1983 and accounts for 141 MMbbls of the cumulativeMPZ oil production. As discussed above, a CO 2 -EOR ROZ pilot is underway in thisreservoir. The production history of the Seminole Field is shown in Figure 26,Production History of the Seminole San Andres Unit (SSAU).3-10 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 34 and 35: The initial forecasts of oil respon
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
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Field Cashflow Model Pattern FieldS
Page 96 and 97:
Page 98 and 99:
BasinFieldFormationTechnology CaseD
Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Field Cashflow Model Pattern FieldS
Page 106 and 107:
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Assessing Technical and Economic Recovery of Oil Resources

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