Presentation on theme: "Marco R. Thiele and Rod P. Batycky"— Presentation transcript:
1Marco R. Thiele and Rod P. Batycky SPE ATCE Denver, CO – October 2003SPE 84040Water Injection Optimization Using a Streamline-Based WorkflowMarco R. Thiele and Rod P. BatyckyStreamSim Technologies—Special thanks you to Nobuo Nishikiori, Arabian Oil Company, for field data set.—
2Outline Objectives and introduction to streamline simulation. The seed: additional data supplied by streamlines.Waterflood optimization.A workflow.Example application.
3Introduction – Biz Objectives Business objectives: grow production, reserves, cash flowMake and execute decisionsStrategies & recommendationsDevelop/obtain knowledgeSynthesis and analysisPerformance Tools (simulation)Obtain and use key dataPeoplePerformance ToolsAnaloguesDecline Curve AnalysisMaterial Balance/Type Curve AnalysisStreamline SimulationFinite Difference SimulationIntegrated Production ModelingIncreasing complexity,time, skill, knowledge(after Pande 2003)
4Introduction—Streamline Sim. Solve transport problem along 1D streamlines rather than on an underlying 3D computational grid.Efficient solution of transport problemfiner grids, speed but also visualization & new data.GeologyPressureStreamlinesCompositions(From Y. Gautier et al., 1999)
5Modern Streamline Simulation SL’s are traced in 3D.Conservation equations along SL’s are in terms of TOF.SL’s are updated in time to reflect changing reservoir conditions.Numerical 1D solutions along SL’s.GravityCompressibility
6The seed—New Data from SL’s Streamlines are able to quantify injector/producer relationships:
8The seed – Injection Efficiency Ieff for injector or for each producer-injector pair; changes with time.Works as a ratio of rates (instantaneous) or cumulative volumes (average)Can be used for any injection volume type.
9The seed – Injection Efficiency Injection efficiencies can be used to automatically identify well pairs with extreme water cycling.Oil ProducedWater Injected
10Waterflood Optimization Objectivebest use of injected volumes…for displacement purposes, not re-pressurization.Increase rates in “high” efficiency connections, decrease rates in “low” efficiency connections.Must increase/decrease rates at both producersand injectors.
11Waterflood Optimization Once well pairs are identified, use a weighting function to decide how much volume to shift from low to high efficiency injectors.
12Workflow t,q Calculate efficiencies using last know rates. t,qn+1 Re-allocate rates using weights from equation.t+Dt,qn+1Simulate forward by Dt using new rates.
21ConclusionsStreamlines offer a powerful new way to optimize flooding operations:Well allocation dataFlux Pattern MapStreamlines complementary to more traditional simulation approaches.Procedure is automaticability to optimize large fields/many wells.