Well completion

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Well completion

• The value of smart well technology

Hans Ivar Berge 30 Oct. 2007
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Well completion reservoir management

• Important elements in well completion
  assessments
• Field production strategy (gas / water
  injection)
• Commingled production (multiple zone completion)
• Formation properties and expected well
  productivity will help to decide
• Number of wells, single zone / multi zone
  completions...?
• The need for multi lateral technology?
• Multi lateral technology including branch
  control?
• Across field communication and the effect of
  injection scheme?
• What do we need?A flexible downhole completion
  solution to be able to handle unexpected
  production results as water gas breakthrough,
  loss of productivity etc

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Smart well concept
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Schlumberger On/Off valve
TRFC-H
TLFC-H
Path of fluid flow
Annulus to Tubing
In Line
Path of fluid flow
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Norne, Smart well tech., Welldynamics
- Upper, Middle and Lower Assembly -
Infinitely Variable Choke
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WellDynamics Low cost valve (MC)

• On/off
• Two control lines to operate
• Short (1 m)

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Smart well completions, some key pro- elements.

• Remotely controlled inflow systems, ref. the
  trade mark s-c-r-a-m-s
• Production inflow control for the individual
  production interval.
• Pressure monitoring for each of the zones without
  intervention..
• Allows for individual zonal cleanup in reservoirs
  with contrasts in res. pressure.
• Represents a major improvement of injection
  control incommingled water injectors, ref.
  thermal fracturing and change in inflow profile
• Provides critical data for well planning,
  placement of future wells..!
• Will allow for reduced frequency of well
  interventions
• Plug and perf. operations..
• Running of straddle sleeves for isolation of gas
  and water breakthrough
• Reduced need for PLTs etc...

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Smart well completions, some cons- key elements.

• Production inflow control for the individual
  production interval.
• To allow for production inflow control for the
  individual production interval external zonal
  isolation is critical..
• Smart well equipment could have the potential to
  choke back and
• Often reduce the maximum flow capacity of the
  well.
• Can smear out the potential production profile,
  impacting net present value
• Segmentation in well design has to match the
  segmentation in the reservoir
• Equipment reliability is important
• Increased upfront investments, 1,5 3 mil UDS
  time for installation.
• Compatibility with other completion equipment /
  interfacing particular in subsea developments..

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The Tampen Area
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Tampen and the Snorre installations
Snorre B. Reservoirs Lunde 2 STOIIP138.2
MSm3 Reserves 58.1 MSm3
Snorre A. Reservoirs Statfjord, Lunde 2 STOIIP
399.2 MSm3 Reserves 174 MSm3
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Snorre A B
Challenge big contrasts in kH-product and
uncertain injection pressure support
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Snorre production experience

• Production and completion challenges
• Heavily faulted and stacked multiple reservoirs.
  Gross thickness gt 1000 m TVD
• Multiple zone injection of gas and water..
• Big contrasts in productivity and connectivity.
• Multiple zone production
• Snorre A, experience
• Experienced early breakthrough of gas and water
  in high perm. thief zones
• Well intervention with PLT for reservoir
  diagnostics complicated, x-flow!
• Positive experience with smart well equipment..

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Experiences from Snorre A P-14B

• Background
• Snorre A producer
• 4 sleeves 1 mechanical
• Gas breakthrough expected after6 months in the
  Lunde fm.
• Experience
• Gas breakthrough 3 months after startup
• Remotely controlled smart well equipment
  identified zone of breakthrough.
• Result 1815 Sm3/d increase in oil rate

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Experiences from Snorre B C-5H PLT/WSO

• One of three predrilled wells with no smart well
  technology installed.
• Water breakthrough after 2 weeks of production.
• PLT run in April 2003 Inconclusive due to
  X-flow masking flow information.
• Set plug based on reservoir understanding,
  reservoir simulation and separator testing.
• Straddle set over anticipated water producing
  interval. Oil production came back as water was
  produced out of x-flowed interval after 5 days of
  production.

• Swapped production lines. Increase in oil
  production of app 2450 Sm3/d for C-5H.
• In the event of smart well technology potential
  increased value app. 590 MNOK!

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Risk analysis of installation of smart well
technology
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(No Transcript)
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Smart well completions, service companies...

• All the big service providers are involved
• Schlumberger, Weatherford, Baker Inteq,
  Halliburtion (Welldynamics)
• Technology
• Direct hydraulic
• Electric and hydraulic
• Electric, hydraulic and chemical downhole
  injection.
• Fiber optics for distributed temperature and
  pressure sensing in the production interval.
  Veslefrikk downhole mono-phase flowmetering.
• Future wireless communication. Saudi Aramco
  Welldynamics....

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Smart well completions and subsea

• Challenges
• Many subsea providers and hydraulic and electric
  communication systems not standarized.
• Through 2002 2006 the industry has agreed to
  adapt to Intelligent well interface
  standarization.
• As a result all completion providers can
  interface hydraulic and electic signals through
  the subsea control systems.

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Smart well and subsea interfacing.
Surface
Subsea control module
5 suppliers
Subsea control system
Power Communication
Downhole sensor control
10 suppliers
Well
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IWIS (Intelligent Well Interface Standard)
Surface
Subsea control module
5 suppliers
Subsea control system
Standard
Power Communication
Downhole sensor control
10 suppliers
Well
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IWIS update

• JIP completed (ex. Qantex) beginning of April
  2006 - Successfully

FMC
Vetco
Kværner
Cameron
DrillQuip
Schlumberger
Weatherford
Roxar
Wood Group
WellDynamics
Promore
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IWIS testing
FMC
Vetco
Kværner
Cameron
DrillQuip
Schlumberger
WellDynamics
Promore
Roxar
Wood Group
Weatherford
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Implementing IWIS
Downhole application
Surface Control
Surface Control
Subsea Electronic Module
Subsea Electronic Module
Interface Card
Interface Card
Well equipment
Well equipment
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Full flexibility
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The value of smart well completions

• Close linked to a multi disciplinary
  understanding of the challenge
• Understanding the reservoir production strategy
  and production profile.
• Completion strategy and effect of same on
  production profile
• Acceleration / possible negative effect on
  production profile.
• Economics and net present value.!
• The value of production flexibility and
  production monitoring (future wells, bypassed
  reserves..)
• Understanding the risk and interfaces in the
  installation phase.
• Every case is unique and requires good multi
  engineering input from the subsurface teams as
  well as from the production facilities group..

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Back-up
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Light Well Intervention due to lack of smart well
technology
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Tyrihans, an example of a multi lateral oil
producer

• Multi laterals with individual flow control.
• Increased reservoir contact to minimize gas and
  water coning.
• Installation of gas lift to aid production at
  start up and to increase oil production at high
  water cuts.