bjørn-ove heimsund erlend Øian geir terje eigestad fileco2 relevance in norway past simulation...

CIPR in-house reservoir simulation activities

Bjørn-Ove Heimsund Erlend Øian Geir Terje Eigestad

H. Dahle M. Espedal G. Fladmark H. Hægland I. Aavatsmark . . .

Centre for Integrated Petroleum Research / Department of Mathematics

University of Bergen

November 1, 2005

CO2 relevance in NorwayPast simulation activities

Current simulation activities

Declaration of the newly elected Norwegian governmentOctober 19, 2005

Norway shall become a world leader in environmentallyfriendly use of natural gas . . .

. . . we will provide the necessary means for cleaning andtransporting of CO2 . . .

The government will make sure that a full-scale cleaning sitefor CO2 removal is established at Kårstø, and we willcontribute economically to this . . .

Bjørn-Ove Heimsund, Erlend Øian, Geir Terje Eigestad CIPR in-house reservoir simulation activities



"Environmental lighthouse of Norway"1

Unconfirmed governmental intentions:

A governmental company will be founded which is to be incharge of creating a chain of value for transport and injectionof CO2.

I Aims to combine environmental effort and enhanced oil recovery.

I Large scale implementation from 2009?

1Ukeavisen 14.10.05Bjørn-Ove Heimsund, Erlend Øian, Geir Terje Eigestad CIPR in-house reservoir simulation activities



LGRBlack-oil simulationCO2 applications

Past activities

I Local grid refinement:I Fast saturation solver using characteristicsI High resolution saturation resultsI Parallelization

I Black-oil simulationI Implicit discretisationsI Unstructured grids





Local grid refinement

I Modified method of characteristics:I Uses corrected operator splitting

on the Buckley-Leverett equationI Allows long time steps

I Adaptive local grid refinements wereused to capture the front

I Two phase incompressible flows





Black-oil simulation

I Secondary oil migration (SOM)black-oil simulator:

I Developed at Norsk HydroI Transfered to UiB (ATHENA)I Sequential IMPEM formulation

I Extensions made at UiB:I Implicit mass treatmentI MPFA discretisationI Static local grid refinementsI Parallelization





CO2 applications

I The ATHENA reservoir simulator hasbeen coupled with the ACCRETE

geochemical simulatorI ACCRETE:

I Calculates the mineralizationprocess by equilibriumthermodynamics

I Reduces the porosity

I ATHENA calculates pressure andadvects particles

I Applied on the Utsira formation




Discretisation on unstructured gridsDomain decompositionTarget applications

Current activities

I Combine previous codes/knowledge into a single simulator with aflexible core:

I Different grids and discretisationsI Different fluid systemsI Parallel and sequential

I Discretisation on unstructured grids:I Control volume methods (MPFA)I Streamline generation

I Domain decomposition





Control volume discretisation on unstructured grids

I The grid structure is alwaysconforming:

I TPFA based on connectionsI MPFA based on corners

I Import filter convert faulted cornerpoint grids to the conforming format

I This yields cells with co-planar“corner-points”

t

HH

H

tt

t





Example of grid handling

I Two phase flow on a highly skewed and anisotropic grid

I The simulator handles general grids with minimized gridorientation effects





Unstructured grid with sealing fractures

I Quarter of a five spot

I Low-permeablefractures

I Grid andtransmissibilities fromMohammadKarimi-Fard





Streamlines

I Fully realistic fieldsimulation grid

I Handling of arbitrarygeometries

I Improved velocityinterpolation





Domain decomposition

Ω1 Ω2

Ω3 Ω4

Ω1 Ω2

Ω3 Ω4

I The global domain Ω is split into disjoint subdomains Ωi

I Pressure is solved on the overlapping subdomains Ωi

I Masses are solved on the non-overlapping subdomains Ωi

I Pressure solver can be accelerated by a coarse mesh

I Can be an efficient parallelization of IMPES black-oil simulators





Target applications

I Validation of Fault Facies models:I Requires faulted gridsI Upscaling and fracturesI Multi-point fluxes necessary

I Study flow of compressible fluids inlarge fields:

I Use of streamlinesI Domain decompositionI Multiscale simulation

I Coupled geochemistry /geomechanical / flow simulation


bjørn-ove heimsund erlend Øian geir terje eigestad fileco2 relevance in norway past simulation...

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