Presentation on theme: "Marco R. Thiele and Rod P. Batycky"— Presentation transcript:
1 Marco 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.—
2 Outline Objectives and introduction to streamline simulation. The seed: additional data supplied by streamlines.Waterflood optimization.A workflow.Example application.
3 Introduction – 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)
4 Introduction—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)
5 Modern 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
6 The seed—New Data from SL’s Streamlines are able to quantify injector/producer relationships:
8 The 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.
9 The seed – Injection Efficiency Injection efficiencies can be used to automatically identify well pairs with extreme water cycling.Oil ProducedWater Injected
10 Waterflood 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.
11 Waterflood Optimization Once well pairs are identified, use a weighting function to decide how much volume to shift from low to high efficiency injectors.
12 Workflow 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.
21 ConclusionsStreamlines 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.