Case Study : History Matching of Well by Predictive Material Balance Term Project : Advanced Reservoir Engineering Presented By, Namit J Jaiswal B.E (Chemical)

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Presentation transcript:

Case Study : History Matching of Well by Predictive Material Balance Term Project : Advanced Reservoir Engineering Presented By, Namit J Jaiswal B.E (Chemical) December 18, 2003 Fairbanks, Alaska

OUTLINE  What is history matching ?  Methods used for history matching  Case description  Solution Scheme  Results  Conclusion and Recommendation

What is history matching ? History Matching is the procedure for determining parameters in a reservoir model from observed production data.

History Matching Process in reservoir Levels of aquifer support Bypassed zone identification Paths of fluid migration

TYPES  Manual  Automatic

Case Description Reservoir type: Volumetric under saturated reservoir Connate water: 37 % Porosity: 21.5 % Drained Area by each well: 40 acres Thickness of pay zone was given by isopach maps of both zones. WellK, Zone 1K, Zone Laboratory core permeability measurements

Solution Scheme 1.Model Development 2.Initialization 3.History Matching

1.Model Development Oil In place Material Balance Tracy’s Model Flow equation

Oil In-Place

Material Balance Calculation of these

Equation cont.

Compare and iterate

Flow Equation

2. Model Initialization Permeability ratios PVT data Isopach Plots Production History Permeability data for cores Given DATA

History Matching Modified Parameter k g /k o k ro H Absolute permeability

Results (5-16 Well ) WELLZone (1)Zone (2)Zone (1)Zone (2)Zone (1)Zone (2) DATA Average Absolute Permeability to Air (md) Average Thickness of Pay zone (ft) Capacity (ft)

WELLZone (1) Zone (2) Zone (1) Zone (2) Zone (1) Zone (2) DATA Average Absolute Permeability to Air (md) Average Thickness of Pay zone (ft) Capacity (ft Result Well (8-16)

WELL Zone (1) Zone (2) Zone (1) Zone (2) Zone (1) Zone (2) DATA Average Absolute Permeability to Air (md) Average Thickness of Pay zone (ft) Capacity (ft) Result Well (9-13)

WELL Zone (1) Zone (2) Zone (1) Zone (2) Zone (1) Zone (2) DATA Average Absolute Permeability to Air (md) Average Thickness of Pay zone (ft) Capacity (ft) Results Well (14-12)

Conclusion Reasonable and Defendable Model Tarner Tracy is fine for this problem