ebo 3 exercises

7/22/2019 EBO 3 Exercises

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ECLIPSE Blackoil Reservoir Simulation


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Exercise 1: Single Well Coning Model

Purpose:

Edit the RUNSPEC section

Use the PRT file for identifying errors

Compare several radial models in ECLIPSE office

Reservoir synopsis:

Radial model

Saturated Oil with dissolved & free gasWell cones gas after ~100 days production


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GRF File

What is a GRF file?

A text file that contains crossplot specifications

Where do I get one?

ECLIPSE Office: Set up the crossplots you want, write out a

GRF for future use

By editing an old GRF fileGRF File


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Exercise 2: SNARK RUNSPEC Section

Purpose:

Create a RUNSPEC section from scratch.

Field SNARK:

Grid Dimensions - 24 x 25 x 12

Oil field initially undersaturated (above bubble point).Aquifer support suspected (we will use a Fetkovich aquifer).

Production from 1 January 1998.

5 producers. Up to 2 wells may be drilled in the future.

Request unified input and output files. Use Field Units.


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Exercise 3: SNARK GRID Section

Purpose:

Specify reservoir geometry & basic rock

properties.Data:

Porosity and Permeability obtained from

wells drilled throughout reservoir (table).Kz/Kx = 0.1

Corner point geometry created

previously in Petrel - SNARK.GRDECLRequest the following output:

EGRID and INIT file

Transmissibility and NNCs to PRT file

0.1726212

0.18287110.1833510

0.182919

0.193348

0.193337

0.171916

0.172575

0.172504

0.06293

0.172442

0.172311

PoroKx, Ky

mDLayer


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Ex 4: SNARK - PROPS & REGIONS Sections

Purpose:

Supply and verify reservoir fluid PVT properties

Supply and verify relative permeability & capillary pressure data

Define distinct reservoir regions

Relevant Data:

Surface Densities (lb/ft3) Oil 42.28; Water 62.43; Gas 0.0971.

Bw is 1.013 rb/stb at 3118 psia, w is 0.4 cP and Cw 2.74x10-6 (psi)-1

Cris 2.8x10-6 (psia)-1 at P

iPVT and Saturation Tables are supplied in PROPS_Data.xlsspreadsheet


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Exercise 5: SNARK - Initialization

Purpose:

Supply initial conditions & define the

aquifer

Data:

Bubble point pressure is 1062.2 psia,

GOR is 973 scf/stb.

Oil-Water Contact: 8200 ft (free

water level)

Pressure: 3035.7 psia at 7000 ft

Aquifer support: Volume 1x107 stb;

PI 5 bbl/day/psi

Aquifer connetions


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Exercise 6: SNARK - History Match

Purpose:

Adjust properties to match measured production

Well data:

All wells have an internal diameter of 0.625 feet and skin of 7.5.

Well production history is in HIST.SCH file

WEST

CENTER

CENTER

CENTER

CENTER

Group

10186PRODUCER

212117PROD4

921616PROD3

101207PROD2

121813PROD1

K2K1JI

PerforationWell HeadWell Name


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Exercise 6: SNARK History Match (cont)

Process

Complete SNARK dataset by supplying well definitions andproduction history

Run sensitivities on

Fault Transmissibility

Aquifer Volume and Deliverability (Productivity Index)

Complete history match for Pressure(Optional) Use Oil Rate control and match water production


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Exercise 7: SNARK Recovery Optimization

Purpose:

Create restart run

Use various group production / injection controls to optimize recovery

Process:

Create restart run with current production ratesCompare with group production control

Compare constant water injection to voidage replacement and

production balancingInvestigate gas reinjection

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