8 Dynamic Well simulations.pdf

OLGA the Dynamic Multiphase Simulator

Dynamic Well Simulation, application areas and benefits using Transient Well Flow Simulations OLGA for Wells John Sundt Senior Vice President, SPT Group

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OLGA application areas and Wells Well Control

Engineering Operation

Steady State Workflow

Flow Assurance

OLGA

Engineering Integration

Operation

Training OTS

Integrated Solutions Online Monitoring & Optimization

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Well Control

Well Control

• 20 years of Well control simulation with OLGA

• Well control specific interface for OLGA, (OLGA ABC)

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Well Control

Well Control

Essential part of emergency response planning – – – –

Blowout rate estimation Relief well design Bull heading Dynamic kill parameters • Kill Rate • Pump Pressures and capacity

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OLGA for Wells

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

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Phenomena requiring dynamic modeling

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A well can be a single flow path

Vertical

Horizontal

Slanted

Undulating

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8

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but can also be a complicated network

Multi-string

Multi-zone

Multi-lateral

Smart

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9

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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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10 10

Linear and non-linear mass-based IPR Constant Productivity Index Vogel equation

•

Normalized Backpressure –

• •

PI

S

Low pressure gas wells High pressure gas wells

User tabulated IPRs Quasi-dynamic inflow performance –

•

PR

Single Forcheimer model –

• •

Gas wells

Q

Forcheimer model –

•

Saturated reservoir (oil/gas)

Saturated oil wells Backpressure equation –

•

Saturated oil reservoir Reservoir variables

–

PR, TR, PI, k-h, S, D, n-C, GOR, WC… etc are available as time series for input

ROCX, Near Wellbore simulator

Time Water Saturation

0.2 0.3 0.4 0.5 0.6 0.7 0.8

0

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Z (Depth)

• • •

Bottomhole flowing pressure

Inflow performance relationship

40

60

80

100 0

0.5

1

1.5

2

X

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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 Host

Well head

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Completion Stinger Design

200.0

199.5

(bara) pressure flowing Wellbore (bara) pressure Wellbore flowing pressure (bara) flowing Wellbore

200.0

199.0 199.5

198.5 200.0 199.0

198.0 199.5 198.5

197.5 199.0

Completion design 1: cemented and perforated casing

198.0

Completion design 2: cemented and perforated casing + passive stinger

197.0 198.5

Completion design 3: cemented and perforated casing + active stinger 197.5

196.5 198.0

Completion design 1: cemented and perforated casing

197.0

Completion design 2: cemented and perforated casing + passive stinger

196.0 197.5

Completion design 3: cemented and perforated casing + active stinger 0

196.5

250

500 750 1000 1250 1500 Completion design 1: cemented and perforated casing

Distance from heel (m)

1750

Completion design 2: cemented and perforated casing + passive stinger

2000

2250

2500

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Production optimization/ Procedures Gas Lift Rate

Gas Lift

Pipe: ID=8”, length 4.6km

Riser: ID:8”, depth: 120 m

Annulus: ID=0.216 m Depth: 2840 m

Tubing: ID=0.1143 m

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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 ESP’s in OLGA

in seconds!

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Gas lift valves and ESP’s in OLGA

In seconds!

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Application areas

Well Flow Assurance

of transient well flow simulations

Hydrate Wax

Heavy Oil

Well Flow Dynamics

Well Integrity

Drilling Hydraulics Annulus Pressure Management Completion Design Leakage Cleanup

Erosion

Well Testing Artificial Lift

Corrosion Equipment Integrity

Gas Well Deliquification

Temperature

Horizontal & Multilaterals

Well Control

Well-Pipeline Interaction Well-Reservoir Interaction Injection CO2 Storage SAGD

Well Surveillance DTS PLT Online/Offline Soft Sensing Water Monitoring

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Publications: more than 70 papers published OLGA-for-Wells papers - yearly statistics (1990~) 12 General

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Control and Optimisation

Validation

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Near-Wellbore

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Liquid Loading Flow Assurance

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Transient Operation

6 Sluging

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Artificial Lift

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Well Testing

3

Cleanup

2

Smart Wells

Well Control

1

Drilling

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

1996

1995

1994

1993

1992

1991

0 1990

Number of papers

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Year 22

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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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be dynamic Thank you for your attention and…

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