It only makes sense to try to optimize the distribution of lift gas if
the amount of lift gas is constrained either by the maximum allowed
gaslift or total gas or the group is under individual control.
If a well is under a group that is limited by a target, it should use as little gaslift as possible.
The reduction algorithm will reduce the gaslift of the well as long as the groups potential is above the groups target.
Introduces two new data types BasicRates and LimitedRates to capture
oil, gas, and water rates, and whether they have been limited by well
or group targets. This reduces the number of variables that are passed
to and returned from various methods and thus makes the code easier to
read.
Introduces a gaslift debugging variable in ALQState in WellState. This
variable will persist between timesteps in contrast to when debugging
variables are defined in GasLiftSingleWell, GasLiftGroupState, or GasLiftStage2.
Currently only an integer variable debug_counter is added to ALQState,
which can be used as follows: First debugging is switched on globally
for BlackOilWellModel, GasLiftSingleWell, GasLiftGroupState, and
GasLiftStage2 by setting glift_debug to a true value in BlackOilWellModelGeneric.
Then, the following debugging code can be added to e.g. one of
GasLiftSingleWell, GasLiftGroupState, or GasLiftStage2 :
auto count = debugUpdateGlobalCounter_();
if (count == some_integer) {
displayDebugMessage_("stop here");
}
Here, the integer "some_integer" is determined typically by looking at
the debugging output of a previous run. This can be done since the
call to debugUpdateGlobalCounter_() will print out the current value
of the counter and then increment the counter by one. And it will be
easy to recognize these values in the debug ouput. If you find a place
in the output that looks suspect, just take a note of the counter
value in the output around that point and insert the value for
"some_integer", then after recompiling the code with the desired value
for "some_integer", it is now easy to set a breakpoint in GDB at the
line
displayDebugMessage_("stop here").
shown in the above snippet. This should improve the ability to quickly
to set a breakpoint in GDB around at a given time and point in the simulation.
This is in agreement with C++ Core Guidelines. A member function should
be marked const unless it changes the object’s observable state. This
gives a more precise statement of design intent, better readability, more
errors caught by the compiler, and sometimes more optimization opportunities.
Refactor getOilRateWithGroupLimit_(), getGasRateWithGroupLimit_(),
getWaterRateWithGroupLimit_(), and getLiquidRateWithGroupLimit_() into
a single generic method called getRateWithGroupLimit_().
GasLiftGroupInfo.cpp did not include "config.h" which caused HAVE_MPI
to be undefined causing the file to be compiled with
Dune::Communication<No_Comm> instead of with
Dune::Communication<MPI_Comm>. Which later caused linking problems with files
that used MPI.
Check group limits in gas lift stage 1 to avoid adding too much ALQ which must
anyway later be removed in stage 2. This should make the optimization
more efficient for small ALQ increment values. Also adds MPI support.
