NEToolTM

1
FORCE AWTC Seminar, 21-22 April, 2004
Advanced Wells - Lessons Learned (application
experience) and Future Directions/Opportunities

• NEToolTM
• a toolbox for Improved Reservoir Management
• Terje Rudshaug, DPT AS
• Thormod Johansen, Memorial University
• Dave Smith, DPT US, Inc
• Arve Huse, DPT AS

2
What is NETool?
NEToolTM

• is a fast, steady-state, network based simulator

• is modelling fluid flow
• through the near wellbore region
• into any type of well configuration
• through any type of well completion

• is modelling wellbore hydraulics in completions
• using completion specific flow correlations
• handling simultaneous tubing and annulus flow
  also bi-directional
• having automatic solving of flow directions

• is modelling reservoir flow via upscaled
  permeabilities and PI models

• is using a Black-Oil PVT formulation

• can be used standalone or coupled with a
  reservoir simulator

• is filling the gap between conventional
  reservoir simulators and well hydraulics software

3
What is NETool?
NEToolTM is a planning and decision making tool
which can be used in

• optimization of well design, well placements,
  well completions and well intervention programs

• quick diagnostics or what if analysis during
  drilling, production and well interventions

• Smart Field realtime production and injection
  control in combination with smart well
  technology

4
NETool - Principles
NEToolTM model
Reservoir simulator
Formation
Well
Annulus

• The well completion and the near wellbore region
  are represented by a network of nodes that can be
  interconnected by flow channels.

• The flow is locally one-dimensional i.e. the
  flow between two adjacent nodes is averaged over
  the cross section of the physical flow path.

5
NETool - Principles

• The network geometry is sufficiently general to
  allow simulation of any completion type, however,
  simple enough to provide high computational
  efficiency.

6
NETool - Reservoir flow modelling

• Upscaling permeability data

• Anisotropy handled by transform to an equivalent
  isotropic system

• Sampling of isotropic permeability data around
  wellbore segments

7
NETool - Reservoir flow modelling
PI models

• Radial flow for vertical sections
• Steady State
• Pseudo Steady State with Shape Factors

• Horizontal Models for horizontal sections
• Steady State Joshi model
• Pseudo Steady State Babu Odeh model

• Modelling of skin
• Damage zone skin (handled in PI equation)
• Perforation skin (explicit calculation)
• Karakas Tariq
• Furui, Zhu Hill (incl perf orientation)

8
NETool - Completion Modeling

• Horizontal well with Open Hole completion
• Including damage zone

9
NETool - Completion Modeling

• Horizontal well with Cemented and Perforated
  Liner
• including damage zone and 2 skin models

10
NETool - Completion Modeling

• Completions with Open Annulus
• Blank Pipe
• Slotted Liner
• Wire-wrapped screens
• Inflow Control Devices (ICDs)
• Option for Collapsed Annulus

• Gravel Packs
• Open hole
• Cased hole

11
NETool - Completion Modeling

• Completions with Open Annulus
• Blank Pipe
• Slotted Liner
• Wire-wrapped screens
• Inflow Control Devices (ICDs)
• Option for Collapsed Annulus

• Gravel Packs
• Open hole
• Cased hole

12
NETool - DIACS well design
13
NETool - Completion Modeling

• Multilateral well with sections of Inflow
  Control and Zonal isolation

14
NETool - User interface
15
NETool Ex 1 IOR on the Troll Field

• Development of thin oil rims through use of
  advanced well technology

NEToolTM used for design of inflow control to
reduce coning and increase oil recovery
Courtesy Hydro, 2004
16
NETool Ex 2 Use of Inflow Control

• Horizontal well without Inflow Control Device

17
NETool Ex 2 Use of Inflow Control

• Horizontal well with Inflow Control Device

18
NETool Ex 2 Inflow Profile Comparisons

• Simulations performed at same total reservoir
  volume from well

19
NETool Ex 2 Results from coupling with Eclipse

• Simulations performed at same total reservoir
  volume from well

20
NETool Ex 3 Dual lateral Producer
21
NETool Ex 3 Soil _at_ 3 yrs - Lateral with screens
only
22
NETool Ex 3 Soil _at_ 3 yrs - Lateral with stinger
23
NETool Ex 3 Log Data vs Simulator Data
24
NETool Ex 3 Final Completion Run
25
NETool Ex 4 PLT Interpretation
26
NETool - Multidisciplinary Work Process
Drilling
NETool
Reservoir

• Well Location
• Well Length
• Hole Size
• Rough Completion

• Drilling Feasibility
• Drillable Well
• Hole Size
• Completeable Well

Initial Reservoir Simulations
Data
Design
Profiles
Drilling and Completion Program
Refined Simulations
Coupled Simulations
Communication
Drill and Log
Final Completion Design (Realtime Sims)
Log Data
Refined Completion
Complete Well
27
NETool - Current developments

• NETool Version 2.0 mid 2004
• Beggs Brill Multi-phase tubing and annular
  flow model
• Ability to use OLGAS2000 from Scandpower for
  modeling multi-phase flow in tubing and annulus
• Cased hole Gravel Pack
• Tabular input option
• User friendly log data import

• NETool.dll Version 1.0 mid 2004
• Allows easier coupling to other simulators

28
NETool - RD projects _at_
RD at Memorial University under Dr. T.Johansen

• Stream-tube based pre-processor for IPR Upscaling

• Combining Stochastic Reservoir modeling,
  Stream-tube modelling and Well Flow modeling
• Simulation while drilling
• Risked based decision making

• Modeling of Transient well flow phenomena
• Transient well test analysis in advanced wells
• Water blocking
• Well clean up
• Gravel packing

• Experimental research in Multi-Phase flow rig
• Flow in annulus with radial inflow and varying
  pipe roughness
• Modeling slip phenomena in well flow

• Modeling of Compositional well flow phenomena
  for Prediction of Solids Precipitation in Well
  Completions

29
NETool - Summary
NEToolTM is a Reservoir Management Toolbox for
multidisciplinary teams dealing with well
planning, completion and production optimization
NEToolTM can model any well geometry and most
completions currently available in the market
NEToolTM encourage interdisciplinary interaction
and decision processes and ensures that all
expertise and experience is involved to the
benefit of the project
NEToolTM is under continuous development to
meet the challenges of tomorrow