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Transient Well Flow Simulations

OLGA the Dynamic Multiphase Simulator

Dynamic Well Simulation, application areas and benefits using OLGA for Wells

John Sundt

Senior Vice President, SPT Group

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Engineering

Operation

Engineering

Operation

Flow Assurance

Integration

Training OTS

Online Monitoring & Optimization

Integrated Solutions

Steady State Workflow

Well Control

Wells

OLGA application areas and

Versatility

OLGA

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Well Control

20 years of Well control simulation with OLGA

Well control specific interface for OLGA, (OLGA ABC)

Well Control

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Essential part of emergency response planning

Blowout rate estimation

Relief well design

Bull heading

Dynamic kill parameters

Kill Rate

Pump Pressures and capacity

Well Control

Well Control

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Wells OLGA for Wells

Well interface to OLGA

Workflow and functionality for Dynamic simulation of well scenarios

Near Wellbore simulator ROCX

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Subsea and offshore Wells

High cost

Costly to work-over

High reliability required

Subsea wells have lower recovery rates

Design, start-up & production optimization

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Phenomena requiring dynamic modeling

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A well can be a single flow path

Vertical Slanted

Undulating Horizontal

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but can also be a complicated network

Multi-string Multi-zone

Multi-lateral Smart

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Accurate performance modeling of the flow control equipment/devices

Flow Control Choke

Check valve

ESP and PDP

Gravitational separator

ESD

SCSSV

Gas-lift valves

ICV and ICD

DIACS

Sliding sleeves

Slotted liner

Sand screen

Controllers

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Inflow performance relationship

Linear and non-linear mass-based IPR

Constant Productivity Index

Vogel equation Saturated oil reservoir

Normalized Backpressure Saturated reservoir (oil/gas)

Saturated oil wells

Backpressure equation Gas wells

Forcheimer model Low pressure gas wells

Single Forcheimer model High pressure gas wells

User tabulated IPRs

Quasi-dynamic inflow performance PR, TR, PI, k-h, S, D, n-C, GOR, WC etc are

available as time series for input

ROCX, Near Wellbore simulator

Bo

tto

mh

ole

flo

win

g p

ress

ure

Q

PI

S

PR

Res

erv

oir

var

iab

les

Time

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X

Z(D

ep

th)

0 0.5 1 1.5 2

0

20

40

60

80

100

0.2 0.3 0.4 0.5 0.6 0.7 0.8Water Saturation

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Some examples

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Unloading Gas Lifted Well

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Well Clean-up / Start-up

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Clean-up to Host

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Well head

Host

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197.5

198.0

198.5

199.0

199.5

200.0

Wellb

ore

flo

win

g p

ressu

re (

bara

)

Completion design 1: cemented and perforated casing

Completion design 2: cemented and perforated casing + passive stinger

196.0

196.5

197.0

197.5

198.0

198.5

199.0

199.5

200.0

0 250 500 750 1000 1250 1500 1750 2000 2250 2500

Distance from heel (m)

Wellb

ore

flo

win

g p

ressu

re (

bara

)

Completion design 1: cemented and perforated casing

Completion design 2: cemented and perforated casing + passive stinger

Completion design 3: cemented and perforated casing + active stinger

196.0

196.5

197.0

197.5

198.0

198.5

199.0

199.5

200.0

0 250 500 750 1000 1250 1500 1750 2000 2250 2500

Distance from heel (m)

Wellb

ore

flo

win

g p

ressu

re (

bara

)

Completion design 1: cemented and perforated casing

Completion design 2: cemented and perforated casing + passive stinger

Completion design 3: cemented and perforated casing + active stinger

Completion Stinger Design

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Production optimization/ Procedures

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Annulus: ID=0.216 m

Riser: ID:8, depth: 120 m Pipe: ID=8, length 4.6km

Depth: 2840 m

Tubing: ID=0.1143 m

Gas Lift

Rate Gas Lift

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Modeling wells in OLGA has become easy. example; Dry-tree well geometry

in minutes!

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Gas lift valves and ESPs in OLGA

in seconds!

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In seconds!

Gas lift valves and ESPs in OLGA

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Drilling Hydraulics

Cleanup

Well Testing

Artificial Lift

Gas Well Deliquification

Horizontal & Multilaterals

Well-Pipeline Interaction

Well-Reservoir Interaction

Injection

CO2 Storage

SAGD

Completion Design

Hydrate

Heavy Oil

Wax

Annulus Pressure Management

Erosion

Corrosion

Equipment Integrity

Temperature

Well Control

Leakage

DTS

Online/Offline Soft Sensing

Water Monitoring

PLT

Well Flow Dynamics Well Integrity

Well Flow Assurance

Well Surveillance

Application areas of transient well flow simulations

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Publications: more than 70 papers published

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1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

Nu

mb

er o

f p

ap

ers

Year

OLGA-for-Wells papers - yearly statistics (1990~)

General

Control and Optimisation

Validation

Near-Wellbore

Liquid Loading

Flow Assurance

Transient Operation

Sluging

Artificial Lift

Well Testing

Cleanup

Smart Wells

Well Control

Drilling

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Summary of Values

Dynamic simulation has proven value throughout the wells life cycle

Planning & Design

Start-up

Production optimization / trouble shooting

For Operators

Reduced risk, increased production and reduced down time

For Service Companies

New service offers and value added solutions

For Engineering companies

Extending Flow assurance to include the well and near wellbore

Offering further value to your client base using familiar tools

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Thank you for your attention and

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be dynamic