WELLB
WELLB provides data for wellbore simulation using drift model.
Record WELLB.1
Free format for 7 parameters
solidFrac, MaxC0, ku, WellFrac, Epson, sg1, bhExchange (Apply to all well sections)
SolidFrac Solid fraction (only used if one wants to increase thermal stability of wellbore cells by including a skin of rock around wellbore or a core of solid inside an annular tunnel in calculation of energy balance but not invoke the usage of the x material). This solid fraction would not affect anything else (e.g., the volume of wellbore cell in fluid flow calculation).
MaxC0 the maximum value of the profile parameter (Cmax).
ku critical Kutateladze number.
WellFrac wellbore fraction in the model grid (default is 1.0, must be <=1.0).
Epson roughness parameter of the well wall.
Sg1 parameter.
btExch borehole heat exchange with surrounding rocks, TRUE or FALSE. If it is TRUE, the input of HeatExch (see WELLB.2.1) for all well sections will be neglected.
Record WELLB.2.1 （optional)
Free format for multiple parameters
ActionWord, para_1, ......, para_n
ActionWord a string which can be a rock name, "GEOTH", "REGFX", or "OFFMA"
(1) If ActionWord is a rock name, parameters for specific well section defined by this rock will be inputted. The parameters are:
RockName, roughness, perforationF, CSArea, surFMulti, outdiam, perimeter, HeatExch
roughness roughness parameter of the well wall at this well section.
perforationF perforation (screen) fraction at this well section.
CSArea cross-section area at this well section.
surFMulti multipler for side surface area describing nozal effect for "x" type well at this section.
outdiam if >0.0 indicating this rock represents a wellbore annulus section; the outdiam value is the outside diameter of the annulus section.
perimeter User-specified perimeter of the pipe, used to account for the additional pressure loss due to complicated geometry (e.g., elbow, joint, and other non-straight pipe) by assigning a larger value. If omitted, the default perimeter (calculated based on the grid) will be used.
HeatExch if HeatExch>0.0, the heat exchange between the well and surrounding rocks at this wellbore section will be turn on. If HeatExch<=0.0, it will be turn off (default).
(2) If ActionWord is "GEOTH", parameters for calculation of the initial temperatures in the model domain will be inputted. The parameters are:
GEOTH, GrToAll, ref_temp, ref_elev1, T_grad1 , ref_elev2, T_grad2, ......
GrToAll indicator for geothermal gradients applying range, =0 apply to well elements only, >0 apply to all model elements.
ref_temp reference temperature at the elevation ref_elev1.
ref_elev1 the lowest reference elevation level.
T_grad1 temperature gradient at the elevation ref_elev1
ref_elev2 the second reference elevation level.
T_grad2 temperature gradient at the elevation ref_elev2
As many as 4 reference elevations and temperature gradients can be inputted.
(3) If ActionWord is "REGFX", parameters for assigning known mass flow rate to a well face will be inputted. The parameters are:
REGFX, FaceName, iniTarget, TransTime, endTarget, maxTarget, Nsteps
FaceName the name of a well face that the mass flow rate will apply to. It must be identical to the connection name of two elements in the wellbore.
iniTarget the mass flow rate at time 0, a negative value indicates flow from Cell 1 to Cell 2 (kg/s).
TransTime end time of flow rate transition period (s).
maxTarget total mass flow rate at the end of transition period (kg/s).
endTarget total mass flow rate for the time after transition period (kg/s).
Nsteps number of tabular flow rate
If Nsteps>0, additonal Nsteps data records are required.
Record WELLB.2.2 （required only when Nsteps>0)
rcTime, flowRate
rcTime time for mass flow rate change (s).
flowRate flow rate at the time rcTime (kg/s).
Repeat data record WELLB.2.2 Nsteps times.
(4) If ActionWord is "OFFMA", input of a list of connections which link a well branch away from the main wellbore. The maximum number of connections for the list is 10.
OFFMA, connection1, connection2, ...... , connection10
connectionN connection name of two wellbore elements. it must be one of the connections defined in the "CONNE" data section in MESH file.
(5) If ActionWord is "FREEE", input of a list of free-end well elements whose density or saturation does not count for spatial average. The maximum number of elements for the list is 10.
FREEE, element1, element2, ...... , element10
elementN name of an end element of a well or tube. it must be one of the elements defined in the "ELEME" data section in MESH file.
Used in: All EOS modules
Example
WELLB
0.0, 1.2, 1.53, 1.0, 0.046e-3, , true //solidfac, maxc0, ku, wellfraction, Epson, , btExch
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