A common PVT calculation for a oil is differential depletion.
The calculations is a series of flash calculations where the pressure is lower in each step and the heavy phase is used as feed to the next flash.
VLXE Oil and Gas lets the user give a feed, a temperature and a list of pressures and the function will then perform the series of flash calculations and display the result to the user in a range.
A wizard is provided to help the user setup the calculation and prepare the sheet for both in- and output.
To open the wizard select Oil and Gas/Calculation.
Below is a screen dump showing the wizard
Below is a screen dump showing the resulting output from the wizard:
Description of the function argument list
Input
Argument |
Type |
Optional |
Description |
Feed |
Range of double |
No |
A range of cells with the feed |
TemperatureList |
Range of double |
No |
One column with a number of rows given the list of temperatures to use in the flash calculations |
PressureList |
Range of double |
No |
One column with a number of rows given the list of pressures to use in the flash calculations |
Output |
C# : string |
No |
Defines the output. (Note currently unused, so just leave blank) |
Components |
C# : string |
No |
Give a list of component names. Only those components are used in the calculations. |
Units |
C# : string |
No |
Set the units used in this calculation. |
Distribution |
C# : object (Expect a range of double) |
Yes |
Gives a range with the distribution of the polymer. Can for example be used if 2 flash calculations are liked as 2 separation tanks. |
BlockMassfraction |
C# : object (Expect a range of double) |
Yes |
Sets the block mass fractions in a co-polymer. |
ProjectSheet |
C#: object |
Yes |
Lets the user set the project sheet to use. |
AdvVLXE |
C# : object |
Yes |
Advanced used. Reserved for use by VLXE. |
AdvUser |
C# : object |
Yes |
Advanced used. Reserved for the user. For example it can be used to force the function update. |
Extra
The function is defined in C# as:
public Object[,] DifferentialDepletion(Range Feed, double Temperature, Range TemperatureList, Range PressureList, string Output, object Components, object Units, [In, Optional] object Distribution, [In, Optional] object BlockMassfraction, [In, Optional] object AdvVLXE, [In, Optional] object AdvUser)