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  1. Hi all,
    What important simulation aspects are to be considered when modeling an oil-gas system with gas lift wells, especially as the model will be used for prediction. It is my first time to handle such a case and wish to solicit the help of those with some experience with such field cases. Thanks for helping.


    See More: Question to simulation engineers!

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  3. dear all

    i have to forecast new field, and no well before, what should i do to make a reservoir model, what constraint i have to use. because the forecast could be so high or even low rate.

    thanks
    acang

    My threads; acang024 :


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    • Dear all
      For constrain or Predication economical limit put
      1-Limit BHFP
      2-Maximum Water Cut
      3-Minimum Oil Production Rate
      4-Prediction time

      My threads; elamin :


    • my field is new, i can't predict what the dominant drive mechanism on my reservoir. Could i make a aquifer in my model? because it can maintenance reservoir pressure, so i can get high cumulative production. but, of course that way could gets wrong forecast. So, my question is, what should i do if i want to make a forecast in a new field.

      My threads; acang024 :


      • Re: Question to simulation engineers!

        Hello,

        I would like to know if there is facility to define multi-stage compressor in Eclipse extended network model.
        For now we used to describe all compressor units in one VFPPROD table in conjunction with NETCOMPA keyword.
        The following keywords used to define interaction with compressors in my model:

        VFPPROD
        WCONPROD
        NETCOMPA
        NWATREM
        WTEST
        WEFAC
        WORKTHP
        WORKLIM
        PRORDER
        WELDRAW
        WELOPEN
        WECON
        NETBALAN
        GCONPROD

        If you need more information, I will excerpt keyword data from Eclipse input file. I omit these info in sake of clarity.

        I define dtwo delivery points in the network named UKPG and UPPG. First I put all wells in THP control mode
        and then define monthly production rates for this points. Also we have two compressor units just before delivery points.
        There compressors defined in two VFPPROD tables.

        In real world there is two stage compression for flow before it get to gas-main pipeline. The delivery scheme schematically presented in the following drawing:


        [link Point to another website Only the registered members can access]
        Can I define these compression rig in network model? It would be interesting to see how cumulative power changes in
        different time steps, how compression units switched on or off, what mode of operation will be necessary to get
        fixed pressure in final node. It will be wonderful if Eclipse could balance compression ration between stages so
        that power spent on each stage will be equal.


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      • Re: Question to simulation engineers!

        hi all,

        i am a postgraduate student and I ll use eclipse from my thesis. I am trying to understand the basics. So I copied data file from petrofaq website

        [link Point to another website Only the registered members can access]
        Advanced -> Enable -> Edit Command Line

        it says no data selected. What am i doing wrong?

        The way I am trying to import the data is

        Simulation launcher -> Simulators -> Eclipse -> Summary -> Select -> Add dataset

        [link Point to another website Only the registered members can access]

        RUNSPEC
        -- Title is used as header on output, to identify run
        TITLE
        Example Simulation
        -- Specify dimension of model, NX, NY, NZ
        DIMENS
        -- NX NY NZ
        10 10 3 /
        -- Phases included (oil and water, i.e. 2-phase run)
        OIL
        WATER
        -- Units to use, METRIC, FIELD or LAB
        FIELD
        -- Specify maximum values for well data
        WELLDIMS
        -- max.wells; max.cell-connections; Next three values are defaulted
        4 5 3* /
        -- Start date, i.e. “Day 0” in simulation
        START
        1 'JAN' 2012 /


        GRID
        -- Definition of grid cells. From DIMENS keyword above, we have:
        -- N = NX*NY*NZ = 10*3*3 = 90.
        -- In each cell DX = DY = 1000 ft and DZ = 50 ft
        -- (Dimension measured in feet since units were defined as FIELD above)
        -- The grid cells are then defined by:
        DX
        300*1000 /
        DY
        300*1000 /
        DZ
        300*50 /

        --depths which are consistent with the DZ-values defined by:
        TOPS
        100*5000 100*5050 100*5100 /

        -- Permeabilities are constant, so define 300 equal values.
        PERMX
        300*100 /
        PERMY
        300*100 /
        PERMZ
        300*20 /

        -- Porosity is constant in each layer, so define 100 values in layer 1, 100 in layer 2, and 100 in layer 3.
        PORO
        100*0.3
        100*0.23
        100*0.18 /

        PROPS
        -- Relative permeability for water and oil,
        -- and water-oil capillary pressure, as a function of water saturation
        SWOF
        -- Sw Krw Krow Pcow
        0.2 0.00 1.00 326.2
        0.3 0.01 0.99 168.7
        0.4 0.02 0.88 101.2
        0.5 0.03 0.67 67.4
        0.6 0.04 0.56 52.9
        0.7 0.06 0.39 42.4
        0.8 0.19 0.16 0.00
        0.9 0.45 0.00 0.00
        1.0 0.78 0.00 0.00
        /

        -- PVT properties for water.
        -- Pref: Reference pressure for rest of data (psi)
        -- Bw: Volume formation factor for water
        -- Cw: Water compressibiblity
        -- ViscW: Water viscosity
        PVTW
        -- Pref Bw Cw ViscW
        4014.7 1.029 3.13D-6 0.31 0 /

        -- PVT properties for oil
        PVDO
        -- P Bo viscO
        3337.0 1.2600 1.042
        3725.0 1.2555 1.072
        4139.5 1.2507 1.096
        4573.2 1.2463 1.118
        5053.9 1.2417 1.151
        5487.5 1.2377 1.174
        5813.9 1.2356 1.2 /

        -- Dead oil: Rs (Gas resolution factor) is constant
        RSCONST
        -- Rs Bubble-point-pressure
        0.4 3337.0 /
        -- Specify constant rock compressibility.
        ROCK
        -- Pref Cr
        14.7 3.0D-6 /
        -- Fluid densities at surface conditions
        DENSITY
        -- Oil Water Gas
        49.1 64.79 0.06054 /

        SOLUTION
        EQUIL
        -- DD = Datum depth, the depth to which all reports will be referenced.
        -- DD Pres.at.DD OWC Pcow(OWC) Default rest of data items
        5000 4800 6000 0.0 6* /

        SUMMARY
        -- List data vectors which we want stored for graphics post-processing
        -- Field Oil Production Rate
        FOPR
        -- Field Oil Production Total
        FOPT
        -- Field Pressure (averaged reservoir pressure)
        FPR
        -- Field Oil In Place
        FOIP
        -- Field Water Production Rate
        WWPR
        -- Field Water Injection Rate
        WWIR
        -- Well Water Cut for all wells
        WWCT
        /

        SCHEDULE
        -- Specify output of graphics result files for cell data, and times which to write these.
        RPTRST
        BASIC=5 NORST=1 FREQ=6 /

        -- Well specification: Give names, positions (i, j) and main phase of wells
        WELSPECS

        --wname group i j Z(bhp) prefPhase
        'WP1' 'G' 10 2 1* 'OIL' /
        /

        -- Completion data, the well is open to the reservoir in cells in layers from k_hi to k_lo.
        COMPDAT
        --wname ic jc k_hi k_lo open/shut 2*default well_diam 4*default
        'WP1' 10 2 1 2 'OPEN' 2* 0.5 4* /
        /

        -- Well WP1 will produce with an oil rate of 2000 STB/day constrained by that well’s flowing bottomhole pressure is minimum 3350 psi.
        WCONPROD
        --wname open/shut ctrlmode orat 4*Default bhpmin Rest default
        'WP1' 'OPEN' 'ORAT' 2000 4* 3350 /
        /

        -- Milestone dates, e.g. to write results
        DATES
        1 'FEB' 2012 /
        1 'MAR' 2012 /
        /
        -- Change production rate to 4000 STB/day
        WCONPROD
        --wname open/shut ctrlmode orat 4*Default bhpmin Rest default
        'WP1' 'OPEN' 'ORAT' 4000 4* 3350 /
        /
        DATES
        1 'APR' 2012 /
        /

        DATES
        1 MAY 2012 /
        /
        DATES
        1 JUN 2012 /
        /
        DATES
        1 JUL 2012 /
        /
        DATES
        1 AUG 2012 /
        /
        DATES
        1 SEP 2012 /
        /
        DATES
        1 OCT 2012 /
        /
        DATES
        1 NOV 2012 /
        /
        DATES
        1 DEC 2012 /
        /
        DATES
        1 JAN 2013 /
        /

        END
        EDIT -> Problem FiXED
        Last edited by boomtata; 06-04-2014 at 01:45 PM.

        My threads; boomtata :


        • Re: Question to simulation engineers!

          HI , Can any one suggest development strategy for maximum recovery and wells model in petrel and simulator is eclispe100 - I dont know how and which parameters to fill in the prediction/depletion and water injection prediction rules. Here is the link to the model i am working, I have basic idea of how petrel works since I am very new to petrel and eclipse (gives me convergence problem), any help will be appreciated.
          Here is the link to the model:

          [link Point to another website Only the registered members can access]
          Read more:

          [link Point to another website Only the registered members can access]

          My threads; jahsan99 :


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