Hmmm... not sure what to say. This is not the 'expected' behaviour

You have specified a wet gas rate target of 10mmscf/day, with THP limit of 200psi and BHP limit of 300 psi

The correct Eclipse behaviour would then be to try to attain a 10 mmscf/day wet gas rate plateau for as long as possible while not falling below EITHER 200 psi THP or 300 psi BHP. If it falls to either one of the pressure limits, it should then switch to control by that parameter which is about to be violated (in this case THP) and your well will start rate decline. Ultimately your gas rate will dwindle to negligible/zero depending on whether your tubing is loading up

The only logical reason I can see for this not to occur would be if subsequently in your SCHEDULE section you have redefined the WCONPROD for that well..... could this be a possibility? It shouldn't affect things, but are you sure your VLP tables are defined over the entire THP range? Eclipse sometimes does funny things when it has to extrapolate.

If not, there may be some issues with calculation convergence at your wells or something similar - contact your local SLB support rep and send them to deck to see if they can figure it out.

As a quick & dirty workaround, take a look at what rate the well is doing as it passes 200 psi THP, and set that rate as a WECON cutoff