STOMP

Initial Conditions Options (EOR-BO)

STOMP-EOR-BO is designed to solve problems involving the transport of water, oil, gas, and salt with passive solutes or reactive species through variably saturated geologic media under isothermal conditions. Alternatively under the compositional option, the simulator solves problems involving the transport of energy, water, CO2, CH4, salt, and a user-defined number of petroleum components with passive solutes or reactive species through variably saturated geologic media under non-isothermal conditions. The Initial Conditions Card for this operational mode is used to specify the state of the system at the start of the simulation.  For STOMP-EOR-BO the number of degrees of freedom depends on the initial phase condition: 1) aqueous saturated (IC1), 2) aqueous and nonaqueous-liquid saturated (IC2), 3) three-phase (IC3), 4) nonaqueous-liquid saturated (IC4), or 5) nonaqueous-liquid and gas saturated (IC5).  A phase condition must be specified for every grid cell, and each phase condition has a prescribed number of input parameters, which must be defined.  Solutes are passive tracers that partition between the three mobile (i.e., aqueous, nonaqueous-liquid and gas) phases and the immobile solid phase (i.e., geologic media).  When solute transport is specified the initial concentrations of solutes are defined via the solute variable options.  Species are reactive tracers that are associated with a single mobile phase (i.e., aqueous, nonaqueous-liquid, or gas) or the immobile solid phase (i.e., geologic media).  Species migrate between phases via defined equilibrium or kinetic reactions.  When reactive transport is specified and the ECKEChem module is implemented, the initial concentrations of species are defined via the species variable options.  There are three types of parameters, whose initial conditions can be specified: 1) state variables, 2) solute variables, and 3) species variables.  A number of options are available for specifying parameters.

Initial Conditions - IC1 Phase Condition (EOR-BO)

IC1

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Aqueous saturated phase condition. Required entries are temperature, pressure, and salt concentration.

Click here to see the IC1 Phase Condition Parameters...

Temperature

Temperature at the volumetric centroid of the grid cell.  For STOMP-EOR the temperature should be between the triple point 0.01˚C and the critical point 374.14˚C of water.

Pressure

Pressure at the volumetric centroid of the grid cell.  The value should be specified in terms of absolute pressure.

Aqueous Salt Relative Saturation

The relative amount of salt that can be dissolved in the aqueous phase as a function of temperature and pressure at the volumetric centroid of the grid cell.  The value should be between 0.0 and the solubility limit for salt as a function of temperature and pressure.

Aqueous Salt Mass

The mass fraction of salt that is dissolved in the aqueous phase at the volumetric centroid of the grid cell.  The value should be between 0.0 and the solubility limit for salt as a function of temperature and pressure.

 

Overwrite

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When the keyword "overwrite" is included with any of the above options during at restart simulation, the specified values will overwrite those from the restart file.

Initial Conditions - IC2 Phase Condition (EOR-BO)

IC2

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Aqueous plus nonaqueous-liquid saturated phase condition. Required entries are temperature, pressure, aqueous saturation, gas-oil ratio, and salt concentration.

Click here to see the IC2 Phase Condition Parameters...

Temperature

Temperature at the volumetric centroid of the grid cell.  For STOMP-EOR the temperature should be between the triple point 0.01˚C and the critical point 374.14˚C of water.

Pressure

Pressure at the volumetric centroid of the grid cell.  The value should be specified in terms of absolute pressure.

Aqueous Saturation

The aqueous saturation at the volumetric centroid of the grid cell.  The value should be between the residual aqueous saturation and 1.0, unless the s-P function has been extended to saturations below the residual aqueous saturation.  In this case the value should be between 0.0 and 1.0.

Aqueous Salt Relative Saturation

The relative amount of salt that can be dissolved in the aqueous phase as a function of temperature and pressure at the volumetric centroid of the grid cell.  The value should be between 0.0 and the solubility limit for salt as a function of temperature and pressure.

Aqueous Salt Mass

The mass fraction of salt that is dissolved in the aqueous phase at the volumetric centroid of the grid cell.  The value should be between 0.0 and the solubility limit for salt as a function of temperature and pressure.

Gas-Oil Ratio

The gas-oil ratio (GOR) is the amount of gas dissolved in the oil. Heavy oils (lower API gravity) contain less dissolved gas than lighter oils. Gas-oil ratio can range from 0 to approximately 2000 scf / bbl. For most purposes, the solution GOR at the bubblepoint is the value of interest. Past the bubblepoint, the gas begins to come out of solution and form free gas, and the oil is said to be undersaturated.

Mole Fraction Summation

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The summation of the total mole fractions of all petroleum components, including CO2 and CH4 must be 1.0 

Overwrite

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When the keyword "overwrite" is included with any of the above options during at restart simulation, the specified values will overwrite those from the restart file.

Initial Conditions - IC3 Phase Condition (EOR-BO)

IC3

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Three-phase condition. Required entries are temperature, pressure, aqueous saturation, gas saturation, and salt concentration.

Click here to see the IC3 Phase Condition Parameters...

Temperature

Temperature at the volumetric centroid of the grid cell.  For STOMP-EOR the temperature should be between the triple point 0.01˚C and the critical point 374.14˚C of water.

Pressure

Pressure at the volumetric centroid of the grid cell.  The value should be specified in terms of absolute pressure.

Aqueous Salt Relative Saturation

The relative amount of salt that can be dissolved in the aqueous phase as a function of temperature and pressure at the volumetric centroid of the grid cell.  The value should be between 0.0 and the solubility limit for salt as a function of temperature and pressure.

Aqueous Salt Mass

The mass fraction of salt that is dissolved in the aqueous phase at the volumetric centroid of the grid cell.  The value should be between 0.0 and the solubility limit for salt as a function of temperature and pressure.

Aqueous Saturation

The aqueous saturation at the volumetric centroid of the grid cell.  The value should be between the residual aqueous saturation and less than 1.0, unless the s-P function has been extended to saturations below the residual aqueous saturation.  In this case the value should be greater than 0.0 and less than 1.0 for this phase condition.

Gas Saturation

The gas saturation at the volumetric centroid of the grid cell. The value should be greater than 0.0 and less than 1.0 for this phase condition.

Saturation Summation

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The aqueous, nonaqueous-liquid, and gas saturations sum to 1.0. The nonaqueous-liquid saturation is determined from the aqueous and gas saturation and should be greater than 0.0 and less than 1.0 for this phase condition.

Overwrite

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When the keyword "overwrite" is included with any of the above options during at restart simulation, the specified values will overwrite those from the restart file.

Initial Conditions - IC4 Phase Condition (EOR-BO)

IC4

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Nonaqueous-liquid saturated. Required entries are temperature, pressure, gas-oil ratio, and water vapor relative saturation.

Click here to see the IC4 Phase Condition Parameters...

Temperature

Temperature at the volumetric centroid of the grid cell.  For STOMP-EOR the temperature should be between the triple point 0.01˚C and the critical point 374.14˚C of water.

Pressure

Pressure at the volumetric centroid of the grid cell.  The value should be specified in terms of absolute pressure.

Gas-Oil Ratio

The gas-oil ratio (GOR) is the amount of gas dissolved in the oil. Heavy oils (lower API gravity) contain less dissolved gas than lighter oils. Gas-oil ratio can range from 0 to approximately 2000 scf / bbl. For most purposes, the solution GOR at the bubblepoint is the value of interest. Past the bubblepoint, the gas begins to come out of solution and form free gas, and the oil is said to be undersaturated.

Water Vapor Relative Saturation

The relative humidity of the water vapor for the given temperature and pressure.

Overwrite

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When the keyword "overwrite" is included with any of the above options during at restart simulation, the specified values will overwrite those from the restart file.

Initial Conditions - IC5 Phase Condition (EOR-BO)

IC5

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Nonaqueous-liquid and gas saturated. Required entries are temperature, pressure, gas saturation, and water vapor relative saturation.

Click here to see the IC5 Phase Condition Parameters...

Temperature

Temperature at the volumetric centroid of the grid cell.  For STOMP-EOR the temperature should be between the triple point 0.01˚C and the critical point 374.14˚C of water.

Pressure

Pressure at the volumetric centroid of the grid cell.  The value should be specified in terms of absolute pressure.

Gas Saturation

The gas saturation at the volumetric centroid of the grid cell. The value should be greater than 0.0 and less than 1.0 for this phase condition.

Saturation Summation

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The aqueous, nonaqueous-liquid, and gas saturations sum to 1.0. The nonaqueous-liquid saturation is determined from the aqueous and gas saturation and should be greater than 0.0 and less than 1.0 for this phase condition.

Water Vapor Relative Saturation

The relative humidity of the water vapor for the given temperature and pressure.

Overwrite

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When the keyword "overwrite" is included with any of the above options during at restart simulation, the specified values will overwrite those from the restart file.

Initial Conditions - Solute Variable Options (EOR-BO)

Click here to see the Solute Variable Options...

Solute Volumetric Concentration

Solute concentration per grid-cell volume at the volumetric centroid of the grid cell.  The value should be greater than or equal to 0.0 and the units for solutes need be consistent across all input cards.

Overwrite

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When the keyword "overwrite" is included with any of the above options during at restart simulation, the specified values will overwrite those from the restart file.

Initial Conditions - Species Variable Options (EOR-BO-R)

ECKEChem

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Species are reactive and require the ECKEChem Module to be implemented in the simulator.

Click here to see the Species Variable Options...

Aqueous Species - Aqueous Concentration

Aqueous species aqueous concentration, in terms of moles of species per mass of aqueous phase at the volumetric centroid of the grid cell.  The value should be greater than or equal to 0.0.

Aqueous Species - Aqueous Molal Concentration

Aqueous species aqueous concentration, in terms of moles of species per kg of water at the volumetric centroid of the grid cell.  The value should be greater than or equal to 0.0.

Nonaqueous Species - Nonaqueous-Liquid Concentration

Nonaqueous-liquid species nonaqueous-liquid concentration, in terms of moles of species per mass of nonaqueous-liquid phase at the volumetric centroid of the grid cell.  The value should be greater than or equal to 0.0.

Gas Species - Gas Concentration

Gas species gas concentration, in terms of moles of species per mass of gas phase at the volumetric centroid of the grid cell.  The value should be greater than or equal to 0.0.

Species Volumetric Concentration

Aqueous, nonaqueous-liquid, gas, or solid species volumetric concentration, in terms of in terms of moles of species per grid-cell volume at the volumetric centroid of the grid cell.  The value should be greater than or equal to 0.0.

Overwrite

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When the keyword "overwrite" is included with any of the above options during at restart simulation, the specified values will overwrite those from the restart file.

Initial Conditions - Parameter Specification Options (EOR-BO)

Click here to see the Parameter Specification Options...

Direct Input

Parameters are read directly from the input file with an associated domain and directional gradients.

Rock/Soil Zonation

Parameters are associated with a rock/soil type. All grid cells with the specified rock/soil type are assigned the specified parameter value.

External Binary File

Parameters are read from an external file in binary format. This option requires one parameter be specified for every node, following the I-J-K indexing order.

External Text (ASCII) File

Parameters are read from an external file in text format. This option requires one parameter be specified for every node, following the I-J-K indexing order.

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