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This study presents a detailed reservoir analysis, history matching production data, predicting future production, and estimating remaining oil reserves for Reservoir A-37. Key assumptions, conclusions, and recommendations are outlined based on the analysis.
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Res A Performed By Gemini Solutions, Inc. May 2001
Res A • Tasks: • Create full field model • History match recorded production and pressures • Predict future production for current well
Res A Area Modeled
Res A 37 Top of Structure - Section Modeled
Res A 37 Gross Sand Thickness and Model Grid – aquifer excluded
Ternary Diagram - gas and water 8 Layer Model
History Match • Assumptions: • Infinite high permeability aquifer down dip • Original oil in place adjusted up to 11.1 MMBO • Original Free Gas in Place = 12 BCF • Adjusted oil zone porosity from 30% to 35%
Vertical Fluid Movement Time Across and Cross Section Down – X direction, on strike
Vertical Fluid Movement Downdip to Updip – Y direction
Vertical Fluid Movement Through producing well – X direction, on strike
Vertical Fluid Movement Through Producing Well – Updip to Downdip
Contour Map Layer 1 – Gas Cap Oil movement into gas cap
Contour Map Layer 2 – Gas Cap Oil movement into gas cap
Contour Map Layer 3 – Oil Zone Water movement into oil zone
Contour Map Layer 4 – Oil Zone Water movement into oil zone
Contour Map Layer 5 – Oil Zone Water movement into oil zone
Contour Map Layer 6 – Oil Zone Water movement into oil zone
Contour Map Layer 7 – Oil Zone Water movement into oil zone
Res A 37 Predictive Run • Remaining oil reserves: • 700 MMBO for 1000 psi flowing bottom hole abandonment
Res A 37 • Conclusions • 700 MMBO reserves 1000 psi flowing bottom hole abandonment • 39% ultimate oil recovery factor with current well • Bypassed reserves may exist • significant oil volume may have moved to the gas cap • Quick study possible • < 2 man days
Res A 37 • Recommendations: • Improve water/gas history match further • Explore additional wells to recover bypassed oil in gas cap • Explore possibility that oil in place is higher ( especially in southwest quadrant ) • history match would still be possible • gas and water match could be improved further • new drilling location may be possible