[case] WELLBORE_SIMULATOR

Under the assumptions of the drift-flux model in a geothermal well with a constant cross-sectional area, the transient geo-fluid flow in a two-phase one-component geothermal well can be quantified using one-dimensional formulations of mass, momentum, and energy balance.

Attention

The process is restricted to vertical wells. Gravity enters the balance equations twice, and the two paths do not treat an inclined well consistently:

• The specific body force is projected onto the well axis, so it carries the factor \(\cos\theta\) with the inclination \(\theta\) measured from the vertical.
• The drift-flux closure is not projected. Both its drift flux velocity, MaterialPropertyLib::driftFluxVelocity(), and its profile parameter, MaterialPropertyLib::driftFluxProfileParameter(), are correlations for vertical flow and receive no inclination correction.

A simulation on an inclined mesh therefore combines an inclination-corrected body force with an uncorrected buoyant slip and is incorrect: the axial drift, and with it the void fraction and the phase holdup, are overestimated. The mismatch is worst for a horizontal section, where the body force vanishes while the drift flux velocity keeps its full vertical value. Beyond roughly 70 degrees from the vertical the flow leaves the bubbly and slug regimes the closure is derived for, so an inclination correction alone would not make such a section right either.

Child parameters, attributes and cases

• [tag] heat_exchange_with_formation
• [tag] process_variables
• [tag] productivity_index
• [tag] reservoir_properties
• [tag] specific_body_force
• [tag] wellbore
• [tag] wellbore_ref_enthalpy
• [tag] wellbore_ref_pressure

This process is commonly used together with the following media properties

Note: This list has been automatically extracted from OGS's benchmark tests (ctests). Therefore it might not be exhaustive, but it should give users a good overview about which properties they can/have to use with this process. Probably most of the properties occurring in this list are mandatory.

The list might contain different property <type>s for some property <name> to illustrate different possibilities the users have.

• OpenGeoSysProject/media/medium/phases/phase
  • <type> [case] AqueousLiquid
  • <type> [case] Gas
• OpenGeoSysProject/media/medium/phases/phase/properties/property
  • <name> density
    <type> [tag] WaterDensityIAPWSIF97Region1
  • <name> enthalpy
    <type> [tag] WaterEnthalpyIAPWSIF97Region1
  • <name> saturation_density
    <type> [tag] WaterLiquidDensityIAPWSIF97Region4
  • <name> saturation_density
    <type> [tag] WaterVapourDensityIAPWSIF97Region4
  • <name> saturation_enthalpy
    <type> [tag] WaterLiquidEnthalpyIAPWSIF97Region4
  • <name> saturation_enthalpy
    <type> [tag] WaterVapourEnthalpyIAPWSIF97Region4
  • <name> saturation_temperature
    <type> [tag] WaterSaturationTemperatureIAPWSIF97Region4
  • <name> temperature
    <type> [tag] WaterTemperatureIAPWSIF97Region1
  • <name> viscosity
    <type> [tag] WaterViscosityIAPWS

Additional info

No additional info.

Used in the following test data files

• [→ ogs/ogs/master | → doc] WellboreSimulator/1Phase_wellbore_small_newton.prj
• [→ ogs/ogs/master | → doc] WellboreSimulator/2Phase_wellbore_small_newton.prj
• [→ ogs/ogs/master | → doc] WellboreSimulator/2Phase_wellbore_small_newton_nonnegdamping.prj