ebo 4 grid edit

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Eclipse 100 Describtion

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rivateGRID Section

This slide does not appear in the manual

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Purpose of the GRID section

The Grid section contains the properties used to calculate

pore volume & transmissibility

ECLIPSE uses cell pore volume and transmissibility to

calculate flows from cell to cell

),,(

),,(

L

NTGAK

T

),,(

z)y,(x,

zyx

zyxzyx

=NTGVPV cell =

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Minimum GRID Section

Required Properties for each cell in the model:

Geometry

Cell dimensions & depths

Properties

Porosity

Permeability

(Net-to-gross or net thicknessif not included, ECLIPSEassumes equal to 1)

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Types of Grids Supported

Block CenteredCorner Point

Cartesian

1

Unstructured (PEBI)

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Block-Centered vs Corner Point: Geometry

3

Block-Centered Corner PointZCORN keywordspecifies the height

of all corners of all

cells

COORD keyword

specifies the X,Y,Z ofthe lines that define

the corner of all cells

x

x

x

x

x

x

x

x

x

x

x

x

(10,1,1)

(11,1,1)

TOPS keyword specifies the

upper face depthDX keyword specifies the

thickness of the cells in the I

direction

DY keyword specifies the

thickness of the cells in the Jdirection

DZ keyword specifies the

thickness of the cells in theK direction

Note: DXV, DYV, DZV are alternate forms

(10,1,1)

(11,1,1)

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(11,1,1)(11,1,1)

Block-Centered vs Corner Point: Transmissibility

Flow from cell can flow to cell(s)

Block-Centered Corner Point

2

Cell connections are by

logicalorder:

(11,1,1) (11,1,2) & (10,1,1)

Cell connections are by

geometricposition:

(11,1,1) (11,1,2), (10,1,2)partial & (10,1,3)

(10,1,1) (10,1,1)

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Block-centered vs Corner point: Summary

Block-centered

Cell description is simple

Pre-processor is not required

Geometry data is small

Geologic structures are modelledsimplistically

Pinchouts & unconformities are

difficult to modelIncorrect cell connections

across faults (user must modify

transmissibility)

Corner Point

Cell description can be complex

Pre-processor is required

Geometry data is voluminous

Geologic structures can bemodelled accurately

Pinchouts & unconformities can

be modelled accuratelyLayer contiguity across fault

planes is accurately modelled

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Block-centered Corner Point

NX, NY, NZ NR, NTHETA, NZ NX, NY, NZ NR, NTHETA, NZ

DX, DY, DZ (orD*V form)

DTHETA, DZ (orD*V form)

COORD, ZCORN COORD, ZCORN

PERMX, -Y, -Z PERMR, -THT, -Z PERMX, -Y, -Z PERMR, -THT, -Z

MULTX, etc MULTR, etc MULTX, etc MULTR, etc

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Grid Cell Property Definition

Cell propertiessuch as PORO,PERMX,PERMY,

PERMZ, NTGare averagesdefined at thecentre

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Cell data is read with i cycling fastest, followed by j then k

i increasing

j increasing

k increasing

(12,4,1)

1

(1,1,1)

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Cell data is read with R cycling fastest, followed by then k

k increasing increasing

R increasing

(4,3,1)

1

(1,1,1)

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Unstructured grids do not have row-column type

organization

ECLIPSE requires this information, so cells are assignedI,J,K values by FloGrid

(2,4,1)(8,19,1)

Use a post-processor to modify a PEBI grid!

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Inactive Cells

Avoid simulating fluid flow in unimportant cells

ACTNUM explicitly set each cells behaviour

0 indicates the cell is inactive

1 indicates the cell is active

MINPV indicate a minimum pore volume for a cell to be activePINCH indicate a minimum thickness for a cell to be active

ECLIPSE will automatically inactivate any cell with zero pore volume

Note: FloViz & FloGrid are normally defaulted to show active cells only

(Scene | Grid | Show | Inactive cells)

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Cell Property Definition Rules

One property per cell (NX*NY*NZ)

Values must be defined for inactive cells too

Explicit values only

ECLIPSE has no facilities for entering data as a function

FloGrid, Office, FloViz have property calculators

Define the property with the pre-processor

Export the property as a text file (*.grdecl) Use the INCLUDE keyword

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Input Examples

--NX = 5, NY = 3, NZ = 4

NTG

1.00 1.00 1.00 1.00 1.00

1.00 1.00 1.00 1.00 1.00

1.00 1.00 1.00 1.00 1.00

15*0.40

15*0.95

15*0.85 /

EQUALS

'PORO ' 0.250 /

'PERMX' 45 /

'PERMX' 10 1 5 1 3 2 2 /

'PERMX' 588 1 5 1 3 3 3 /

/

BOX

1 3 1 3 1 1 /

PORO

9*0.28 /

PERMX

100 80 85 83 99 110 92 91 84 /

ENDBOX

COPY

'PERMX' 'PERMY' /

'PERMX' 'PERMZ' /

/

MULTIPLY

'PERMZ' 0.05 /

/

2

Specify each value

Specify similar values

with the *

BOX example

This would overwrite

PORO & PERMX

specified previously

EQUALS exampleApplies to whole grid

Applies to cells specified

COPY example

MULTIPLY example

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Cell Property Definition using Petrel

The properties are assigned to each cell during upscaling &

exported to a file

The INCLUDE keyword is used to load the properties from

Petrel:

INCLUDE

grainne_props.grdecl /

grainne_props.grdecl

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Local Grid Refinement

Allows high grid resolution in an area of interest while keeping a

low resolution elsewhere.

Typical applications:

Near well pressure changes

Coning and cusping

Condensate dropout

Areas of high well densityFields sharing a common aquifer

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CARFIN

--Name I1 I2 J1 J2 K1 K2 NX NY NZ Wells

LGR1 2 4 2 7 1 1 6 18 1 1 /

CARFIN

--Name I1 I2 J1 J2 K1 K2 NX NY NZ Wells

LGR1 2 4 2 7 1 1 6 18 1 1 /

CARFIN

--Name I1 I2 J1 J2 K1 K2 NX NY NZ Wells

LGR1 2 4 2 7 1 1 6 18 1 1 /

Introducing a Cartesian LGR

1) Choose global cells to refine

2) Decide on LGR size

3) Insert CARFIN, update LGR in

RUNSPEC

I t d i R di l LGR

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1) Choose global cells to refine

Single vertical column OR

2 x 2 vertical column (E100 only)

2) Decide on LGR size

Limited choice for NTHETA: Single column -> 1 or 4

2 x 2 column -> 4 or 8

R di l LGR E l

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A single vertical column of cellsRADFIN

--Name I J K1 K2 NR NTHETA NZ Wells

RAD1 2 2 1 1 4 1 1 1 /

0.507 /

R di l LGR E l

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A 2 x 2 vertical column of cells (E100 only)RADFIN4

--Name I1 I2 J1 J2 K1 K2 NR NTHETA NZ Wells

RAD4 4 5 4 5 1 1 6 8 1 1 /

0.507 /

9.0 /

Adj ti th i f LGR

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