DATA REQUIREMENT FOR ECLIPSE INPUT FILE.pdf

DATA REQUIREMENT FOR ECLIPSE INPUT FILE This description is tailored towards building input file for senior design or 402 term project Blackoil simulation case. The Cartesian coordinate system.

REQUIRED

Section Name RUNSPEC

REQUIRED

GRID

OPTIONAL EDIT REQUIRED

PROPS

OPTIONAL REGIONS

REQUIRED

SOLUTION

OPTIONAL SUMMARY

REQUIRED

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SCHEDULE

Description

Title, problem dimensions, switches, phases present, components etc Specification of geometry of computational grid (location of grid block corners), and of rock properties (porosity, absolute permeability, etc.) in each grid block. Modifications to calculated pore volumes, grid block center depths and transmissibilities. Tables of properties of reservoir rock and fluids as functions of fluid pressures, saturations and compositions (density, viscosity, relative permeability, capillary pressure, etc. Splits computational grid into regions for calculation of; • PVT properties (Fluid densities d ensities and viscosities) • Saturation properties (Relative permeabilities and capillary pressures) • Initial conditions (Equilibrium pressures and saturations) • Fluids in place (Fluid in i n place and inter-region flows) If this section is omitted, all grid blocks are put in region 1 Specification of initial conditions in reservoir - may be: • Calculated using specified fluid contact depths to give potential equilibrium • Read from a restart file set up by an earlier run • Specified by the user for every grid block (Not recommended for general use) Specification of data to be written to the Summary file after each time step. Necessary if certain types of graphical output (for example water-cut as a function of time) are to be generated after the run has finished. If this section is omitted no Summary files are created. Specifies the operations to be simulated (production and injection controls and constraints) and the times at which output reports are required. Vertical flow performance curves and simulator tuning parameters may also be specified in the SCHEDULE section

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RUNSPEC SECTION (REQUIRED) MINIMUM REQUIRED DATA 

Project title (TITLE). o

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EX “History Matching’’.

Dimensions of the reservoir (DIMENS). o

This is the discretization of the reservoir in the x, y, z coordinates or the number of gridblocks divisions in the x, y, and z coordinates.

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If for example we have a field of dimensions 15000ft x 15000ft x 150ft and we want to discretize into 10000 gridblocks. We can specify the dimension as “50 50 4” i.e. 50 divisions in x-direction and y-direction and 4 divisions in z-direction.

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Phases present in the simulation model (OIL, WATER, GAS, VAPOIL, and DISGAS).

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Unit of the simulation model (FIELD, METRIC and LAB).

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The date when the production from the field started (START).

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The dimension of the well and groups to be used in the run (WE LLDIMS). o

This is used for defining the maximum number of wells, maximum number of connections per well, maximum number of wells per group etc. in the simulation model.

EXTRA DATA DEPENDING ON YOUR OBJECTIVE 

Dimensions of the table (TABDIMS). o

This defines maximum number of nodes in the saturation, PVT and fluid-in place regions used in the simulation run or the maximum number of rows for each table.

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Dimensions for aquifer (AQUDIMS)

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Regions dimension data (REGDIMS) o

This defines the maximum number of fluid in place regions, the number of sets of fluid-in-place regions etc.

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GRID SECTION (REQUIRED) This section is for defining the geological model. MINIMUM REQUIRED DATA 

Porosity for each gridblocks (PORO). o

 A constant porosity can be defined for whole reservoir or each layer (zdivisions) of the simulation model.

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Permeability for each gridblock in x, y, and z direction (PERMX, PERMY and PERMZ).

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Discretization of the reservoir in x, y, and z direction (DX, DY and DZ).

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Depth of top face of each gridblock (TOPS).

EXTRA DATA DEPENDING ON YOUR OBJECTIVE

KEYWORD  ADD BOX COPY ENDBOX EQUALS MULTIPLY NOGGF  ACTNUM INIT RPTGRID NTG

DESCRIPTION  Adds specified constants to specified arrays in the current input box. Redefines the current input box. Copies data in the current box from one specified array to another. Redefines the current input box to encompass the whole grid. Sets specified arrays to specified constants within the c urrent box. Multiply specified arrays by specified constants within the current box. Specifies that no Grid Geometry file is to be produced (for graphical output). Identifies active grid blocks. Request initial model before start of simulation Output the input and calculated data under this section Net to gross ratio

EDIT SECTION (OPTIONAL) The EDIT section contains instructions for modifying the pore volumes, block center depths, transmissibilities, and non-neighbor connections (NNCs) computed by the program from the data entered in the GRID section. This section is optional. For this course, we will not be covering it.

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PROPS SECTION (REQUIRED) This section is for defining the rock-fluid properties of the simulation model. MINIMUM REQUIRED DATA 

PVT for dead oil (i.e.

Pressure, formation volume factor, viscosity and

 viscosibility) of oil (PVCDO or PVDO). 

PVT for live oil (i.e.

Pressure, formation volume factor, viscosity and

 viscosibility) of oil (PVCO and PMAX or PVTO). 

PVT for water (i.e.

Pressure, formation volume factor, viscosity and

 viscosibility) of oil (PVTW). 

Oil-water relative permeability table with oil-water capillary pressure (SWOF). o

This is in table format. The order of the columns is water saturation, relative permeability of water, relative permeability of oil when water is present and corresponding water-oil capillary pressure.

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The water saturation is in ascending order with corresponding relative permeability of oil when water is present and water-oil capillary pressure.

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There is a choice of two families of keywords for entering relative permeabilities and capillary pressures as functions of saturation. The first family: SWOF and (SGOF or SLGOF), allows you to enter the oil relative permeabilities in the same tables as the water and gas relative permeabilities. The second family: SWFN, SGFN and (SOF3, SOF32D or SOF2), requires the oil relative permeabilities to be entered in a separate table versus oil saturation. KEYWORD SWOF SGOF or SLGOF SOF3 or SOF32D SOF2 SGFN SWFN SGWFN

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DESCRIPTION If both water and oil are present If both gas and oil are present For oil in a 3-phase run For oil, if present, in a 2-phase run For gas, if present For water, if present For gas-water runs only

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Rock compressibility and reference pressure of compressibility (ROCK). o

Written in single row format with reference pressure first then compressibility.

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Density of oil, water and gas (DENSITY). o

Written in single row format with density of oil first then water and gas density.

PROPS KEYWORDS TO BE USED WITH THE DIFFERENT PHASE COMBINATIONS IN A BLACK OIL RUN

Phase combinations Oil and Wet Gas and Dissolved  Vaporized Gas Oil

Oil and Dry Gas Dissolved Gas

Water

Water

Oil and Wet Gas and Dissolved  Vaporized Gas Oil Undersaturated Oil and Constant Dissolved Gas

Dry Gas Dry Gas and Constant  Vaporized Oil

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Water

Water

Keywords either : PVCO,PMAX,PVTG,PVTW or : PVTO, PVTG,PVTW either : SGOF or SLGOF, SWOF or : SOF3 or SOF32D, SGFN, SWFN either : PVCO,PMAX,PVDG,PVTW or : PVTO, PVDG,PVTW either : SGOF or SLGOF, SWOF or : SOF3 or SOF32D, SGFN, SWFN either : PVCO,PMAX,PVTG or : PVTO, PVTG either : SGOF or SLGOF or : SOF2, SGFN either : PVDO, RSCONST(T), PVTW or : PVCDO, RSCONST(T), PVTW either : SWOF or : SOF2, SWFN PVDG or PVZG RVCONST(T), PVDG, PVTW either : SGFN, SWFN or : SGWFN

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REGIONS SECTION (OPTIONAL) The REGIONS section divides the computational grid into regions for: 

Calculation of saturation functions (relative permeability and capillary pressure)

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Calculation of PVT properties (fluid densities, FVFs, viscosities)

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Equilibration (setting initial pressures and saturations)

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Reporting of fluids in place and inter-region flows

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Calculation of directional relative permeabilities

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Calculation of saturation functions for imbibition (Hysteresis option)

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Calculation of ROCKTAB properties for the Rock Compaction option

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Calculation of initial tracer concentrations (Tracer Tracking option)

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Calculation of the saturation table end points from depth tables (for the saturation table End Point Scaling option)

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Calculation of mixture properties (Miscible Flood option)

KEYWORDS

Keywords RPTREGS FIPNUM SATNUM EQLNUM PVTNUM

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Descriptions Report levels for REGIONS data. Fluid-in-Place regions. Saturation table regions. Equilibration regions. PVT data regions.

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SOLUTION SECTION (REQUIRED) The SOLUTION section contains sufficient data to define the initial state (pressure, saturations) of every grid block in the reservoir. EQUILIBRATION KEYWORDS

Restriction Required for equilibration.

Optional for equilibration in live oil systems. Optional for equilibration in live oil systems. Optional for equilibration in wet gas systems. Optional for equilibration in wet gas systems.

Keyword Description EQUIL Fluid contact depths and other equilibration parameters. RSVD  Variation of solution GOR with depth.

PBVD RVVD PDVD

 Variation of bubble point pressure  with depth.  Variation of vapor OGR with depth.  Variation of dew point pressure with depth.

ENUMERATION KE YWORDS

Restriction Either RS or PBUB required for enumeration in live oil systems. Either RV or PDEW required for enumeration in wet gas systems. Either PRESSURE or PRVD is required for enumeration. Either RS or PBUB required for enumeration in live oil systems. Either RV or PDEW required for enumeration in wet gas systems. Required for enumeration in two/threephase systems with gas. Required for enumeration in two/threephase systems with water

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Keyword PBUB

Description Bubble point pressures in every grid block. PDEW Dew point pressures in every grid block. PRESSURE Pressures in every gridblock RS Solution gas-oil ratios in every grid block. RV Vapor oil-gas ratios in every grid block. SGAS Gas saturation in every gridblock. SWAT Water saturation in every grid-block

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SUMMARY SECTION (OPTIONAL) The SUMMARY section specifies a number of variables that are to be written to Summary files after each timestep of the simulation. The graphics post-processor may be used to display the variation of variables in the Summary files with time and  with each other. If there is no SUMMARY section, ECLIPSE does not create any Summary files. SCHEDULE SECTION (REQUIRED) The SCHEDULE section specifies the operations to be simulated (production and injection controls and constraints) and the times at which output reports are required. Vertical flow performance curves and simulator tuning parameters may also be specified in the SCHEDULE section.

MINIMUM REQUIRED DATA To define a well and its connection properties and controls, the following keywords should be used: 1. WELSPECS (to introduce the well). Having created a well specification you can now set its completion and control data. 2. COMPDAT (to specify its completion data) 3.  You can specify well controls using the following keywords: 

WCONPROD (production controls, if the well is a producer) or

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WCONINJE (injection controls, if the well is an injector) or

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WCONHIST  (measured flows and pressures, if it is a history matching producer) or

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WCONINJH  (measured flow and pressures, if it is a history matching injector) or

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WCONINJP (control of a pattern flood injector)

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TIME, TSTEP or DATES keyword advances the simulation to a specified time or dates. WEFAC Sets well efficiency factors, to take account of downtime when  wells are taken down individually on a regular basis. WELOPEN Opens or closes wells or connections. WLIST Constructs well lists for use with other well keywords. WLISTARG Resets individual operating targets or limits for a list of wells, constructed with the WLIST keyword. WECON Economic operating limits on well rates and production ratios. CECON Economic operating limits on individual well connections. WCUTBACK Instructions to cut back well rates to limit coning. WLIMTOL Tolerance fraction for economic limits. If the limit is broken by more than the specified tolerance, the timestep will be repeated after the remedial action has been taken. WORKTHP Instructions to perform a workover if the well is unable to produce at its THP limit. TUNING Timestep and convergence controls. RPTSCHED Report switches to select which simulation results are to be printed at report times. RPTRST Controls data written to the Restart file. END Terminates the simulation.

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