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Final SLB Project
- 1. History Matching andForecasting Simulation Model (SNARK Field) David Chukwuebuka Reservoir Engineering Intern Schlumberger Information Solutions(SIS)
- 2. OUTLINE • Reservoir SimulationOverview • SIS Solutions to Reservoir Simulation • History Matching (SNARK Field) • Prediction/Forecasting(ECLIPSE – OFM) • Conclusion
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- 4. Reservoir Simulation • Constructionand operation of a model whose behaviour assumes the appearance of actual reservoir behaviour. • Simulation – “to give an appearance of. . .”
- 5. Schlumberger Information SolutionsTechnology in Reservoir Simulation
- 6. SIS Technology Platforms Solution tochallenges in exploration & development Integrate wellbore data into multiple discipline Understand and act to hit all of production targets Collaborate with colleagues and share knowledge SIS software extensibility Foundations
- 7. ECLIPSE Black Oil •Represents oil and gas phases as one component. • Applies mathematical modelling to predict reservoir behaviour. • Requires an input file that describes the model.
- 8. Petrel Reservoir Engineering Makinga simple simulation model Upscaling Well engineering Simulation Run and Result Viewing History Matching and Prediction Initialization and Volume calculation FieldProduction Rate History Period Prediction Period (Base Run) (Restart Run) Time Cell Saturations & Pressures recorded • Modeling and simulation in one application Workflow Diagram
- 9. INTERSECT • High-resolution reservoirsimulator with capabilities beyond current simulators. • Yields improved accuracy and efficiency in field-development planning and risk mitigation. • Single simulator for all recovery processes (BlackOil, compositional, thermal).
- 10. OFM • Facilitates quickaccess to information so all the answers are in one place. • Monitor and survey performance with advanced production views. • Forecast production with powerful decline and type curve analysis. • Analyse any asset and share results.
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- 12. Project Workflow Interpreted geology,geophysics and petrophysics Reservoir description Run ECLIPSE Model Prediction runs • Existing wells continue to produce • New drilling may be implemented Model production & Pressure Actual Production & Pressure Is there a good match? NO YES Is there a good match? Sensitivity runs Identify uncertain properties Tuning runs Modify uncertain properties YES
- 13. Project Workflow Interpreted geology,geophysics and petrophysics Reservoir description
- 14. Reservoir description FAULT 1 FAULT2 FAULT 3 • Three faults • 4 fluid in place regions • Oil, water & gas phases present • Oil is initially Under-saturated • Aquifer from southern direction
- 15. Reservoir Fluid Model(PVT) • Fluid densities(lb/cuft): 42.28 (oil), 62.43 (water), 0.0971 (gas) Oilgas
- 16. Reservoir Rock PhysicsFunctions • Rock compaction and Saturation function Oil-water rel. perm Gas-oil rel. Perm
- 17. Aquifer Description • Bubblepoint pressure – 1,062.2 psia • Aquifer model – Fetkovich • PI = 5bbl/psi/day, Volume = 1E7 stb Property Value Pressure Water formation volume factor, Bw 1.013 (rb/stb) 3,118 (Psia) Water compressibility 2.74E-6 (sips) – Water viscosity 0.4 (cp) – Rock compressibility 2.8E-6 (sips) 5,801.5 (Psia) Table of properties No. of Wells Pref. phase Status 5 OIL OPEN Observed data • 1 Jan 1998 – 31 Dec 2007
- 18. Project Workflow Interpreted geology,geophysics and petrophysics Reservoir description Run ECLIPSE Model Model production & Pressure Actual Production & Pressure
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- 21. Project Workflow Interpreted geology,geophysics and petrophysics Reservoir description Run ECLIPSE Model Model production & Pressure Actual Production & Pressure Is there a good match? NOSensitivity runs Identify uncertain properties Tuning runs Modify uncertain properties
- 22. Sensitivity and Tuningruns… • Divide and conquer rule Fault transmissibility Better/worse? Comments 1.0 Base case 0.5 Slight improvement 0.0 Improves appreciably Aquifer initial volume Better/worse? Comments 1E7 Base case 1E9 Slight improvement 1E11 Improves well enough Aquifer PI Better/worse? Comments 5 Base case 50 No change 500 No change • Uncertainties • Aquifer P.I. • Aquifer volume • Fault1 transmissibility
- 23. Project Workflow Interpreted geology,geophysics and petrophysics Reservoir description Run ECLIPSE Model Prediction runs • Existing wells continue to produce • New drilling may be implemented Model production & Pressure Actual Production & Pressure Is there a good match? NO Is there a good match? Sensitivity runs Identify uncertain properties Tuning runs Modify uncertain properties YES
- 24. Development strategy • 2injector wells drilled to boost pressure
- 25. Development strategy • 2injector wells drilled to boost pressure
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- 27. OFM • Forecast productionwith powerful decline and type curve analysis. • Provides tools to manage and analyze production data. • Identify non-producing completions for reactivation. • Track oil completion performance indicators (GOR, cumulative production) • Low rate completions to be considered for workovers • Analyze water production behaviour (explaining water breakthrough)
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- 30. CONCLUSION • Snark Fieldwas history matched to obtain a good degree of correspondence by controlling the oil rate. • Adjustments were also made to aquifer initial volume and fault1 transmissibility. • Optimal development strategy is Voidage; injecting water to replace production and yields improvement in production. • Better GOR control to improve recovery factor.
Editor's Notes
- #7 A software Platform by definition spans multidisciplinary workflows and is extensible. Studio and Ocean are Platform enablers Petrel helps solve subsurface challenges from exploration to development thereby reducing exploration risks Studio environment enables you to find, collaborate and manage knowledge Avocet empowers oil & gas companies to hit all of their production targets with confidence. Avocet delivers a comprehensive view of the Asset — past, present and future — combined with deep science to deliver a critical understanding of operations from reservoir to facilities. Ocean gives freedom to create specialized workflows that solve unique reservoir challenges through plugins ECLIPSE reservoir simulation software family offers numerical simulation techniques for fast and accurate prediction of dynamic behavior for all types of reservoir. GeoFrame integrated reservoir characterization system allows precise description of the subsurface throughout your entire exploration and development workflow. OFM provides a cost effective and integrated environment in which to accomplish complex workflows, forecasting analysis and visualization of reservoir and production data. OFM enables early detection of production problems and their cause
- #10 INTERSECT is a General purpose Next Generation Simulator that is focused on large and complex models. Firstly, to provide exceptionally fast and scalable simulations on parallel machines Secondly, to provide geological scale simulations and refinements around each well for representative modelling of geology and wells.
- #11 For managers, petroleum engineers, or geoscientists
- #22 This explains how the match shown previously was obtained via the sensitivity and tuning runs
- #28 OFM provides a cost effective and integrated environment in which to accomplish complex workflows, forecasting analysis and visualization of reservoir and production data. OFM enables early detection of production problems and their cause