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					Updates of the latest developments
  in OLGA-for-Wells applications


             Bin Hu
Main contents

•   OLGA-for-Wells Round Table II
•   New applications
•   Status of developments
OLGA-for-Wells: Round Table II

•   Attracted 40 participants from 20 organizations
•   20 technical presentations on well flow simulations were
    made
•   2 break-out sessions were held on
    – Improvement and modeling needs
    – OLGA potentials in well flow simulations
    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
                                                                Leak Detection
                      Cleanup
                                                                   Erosion
                   Well Testing
                                                                  Corrosion
                    Artificial Lift
                                                              Equipment Integrity
              Gas Well Deliquification
                                                                 Temperature
             Horizontal & Multilaterals
                                                                 Well Control
             Well-Pipeline Interaction
                                           Well Surveillance
             Well-Reservoir Interaction
                                                                     DTS
                      Injection
                                                                     PLT
                   CO2 Storage
                                                         Online/Offline Soft Sensing
                       SAGD
                                                               Water Monitoring
Publications: more than 60 papers published

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

                   12
                                                                                                                                                                            General

                   11                                                                                                                                                       Control and
                                                                                                                                                                            Optimisation
                   10                                                                                                                                                       Validation

                    9                                                                                                                                                       Near-Wellbore

                                                                                                                                                                            Liquid Loading
                    8
Number of papers




                                                                                                                                                                            Flow Assurance
                    7
                                                                                                                                                                            Transient Operation
                    6
                                                                                                                                                                            Sluging

                    5                                                                                                                                                       Artificial Lift

                    4                                                                                                                                                       Well Testing

                    3                                                                                                                                                       Cleanup

                                                                                                                                                                            Smart Wells
                    2
                                                                                                                                                                            Well Control
                    1
                                                                                                                                                                            Drilling
                    0
                        1990
                               1991
                                      1992
                                             1993
                                                    1994
                                                           1995
                                                                  1996
                                                                         1997
                                                                                1998
                                                                                       1999
                                                                                               2000
                                                                                                      2001
                                                                                                             2002
                                                                                                                    2003
                                                                                                                           2004
                                                                                                                                  2005
                                                                                                                                         2006
                                                                                                                                                2007
                                                                                                                                                       2008
                                                                                                                                                              2009
                                                                                                                                                                     2010
                                                                                              Year
New applications:
Fluid displacement with coiled tubing (done by SPT London)


•   Use the drilling bit and
    moving grid concept to build
    the model
     – Injection while moving
•   To diagnose the failure of
    fluid displacement operation
    by coiled tubing
     – Gas injection rate
     – Gas injection location
•   Suggest the optimized
    operation procedure
New applications:
Downhole virtual metering for decovolution technique
(done by SPT Perth)
                                                   Upstream P-T                    Separator P-T

                                                           Pwh                             Ps Ts
                                                           Twg



                                                                                                   What we know from measurement
           Diesel                                                          Surface Choke
                                                                           Test Manifold
           Completion Mud
                                                                                                   Surface flow rate
                                                                                                   Pressure & Temperature
                   Upper Gauge
   Bottomhole P-T measurements


                      Packer
                    Tester Valve         Downhole Choke effects
                                                                                                   What we don’t know, but have to know
                                         Opening - Closing Test Valve




                                                                                                   Pressure & Flow Rate at the sandface
                                         Middle Gauge
   Pg Tg                                 Bottomhole P-T measurements

                                                                                                   How to know it?
           Gauge P correction
           ΔP=ρgh
           in-situ density                         Flowing bottomhole P-T                          Use this pressure signal as the outlet
                                                                           Formation Top

                                   Pwf
                                   Twf
                                                                  Pr Tr
                                                                           Datum
                                                                                                   boundary condition in the model
                                                                           Formation Bottom

                   Lower Gauge
   Bottomhole P-T measurements
                                                   Initial Reservoir P-T                           Tune the quasi-dynamic IPR
                                         Rathole

                                                                                                   to match the other
                                                                                                   pressure measurements
New applications:
Blow-out rate estimation (OLGA-ROCX, done by SPT Houston)

•   Blow-out is a transient
    process for both wellbore
    and reservoir.
•   The near-wellbore dynamics
    can have a big impact on the
    blow-out rate estimation
•   Using OLGA-ROCX reduces
    the uncertainty induced by
    conservative PI
New applications:
Intermittent gas-production (OLGA-ROCX, done by SPT Oslo)
Development – ROCX JIP

•   A two-year program started from 2009
•   Sponsored by Statoil and Total
•   Main goals:
    – To develop ROCX into a suitable reservoir model to fit its purpose
    – To enhance the robustness of the numerical link between OLGA
      and ROCX
    – To develop primary capabilities for advanced integrated
      simulation, such as component tracking across the sandface
•   The project is due to complete by the end of next year
    – Initial applications have shown promising results
Development – Well GUI

•   Current OLGA GUI is not very convenient for well modeling
•   A project on developing a Well GUI was initialized in 2007
    – The preliminary version was released, setting focus on well
      geometry editing!
•   The development will continue
    – The ambition is to develop it into a comprehensive GUI so that
      most of the well simulations can be done in it without resorting to
      the OLGA GUI
•   The main challenges however are:
    – Network translation, e.g. multi-laterals with smart completions
    – Database for conventional well equipment
OLGA-for-Wells: the new short-cut for promotion!

•   The first gas well liquid loading
    simulation
•   The first intermittent gas
    production simulation
•   The first coiled tubing
    simulation
•   The first blowout simulation
    with reservoir dynamics
    considered
•   The first WAG simulation
•   The first CO2 sequestration
    simulation
•   …
    These are all done by young
    consultants below 30!
    It is time to change your track!
   Why you come back
   so late today? Who   I was together
      have you been     with OLGA...
      together with?



                                  Some tips
Ah.. OLGA,                      and tricks…
What did you
get from her?



                                   Time to
  What else                      change!
 did she say?
be careful... and good night!




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posted:5/10/2012
language:English
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