Ann: BYE: SM 71 Update on Completion Operations, page-20

Sounds like they're completing the well with either a gravel pack or frac pack which is a standard sand control technology for GOM. They perforate the casing, install lower completion (metal screen which prevents sand flowing into the well) and then pump good quality sand behind the screen. If they pump over fracture pressure, that's a frac pack, otherwise it's a gravel pack. The good quality sand acts as a depth filter to prevent formation sand entering the well, the metal screen prevents the larger better quality pumped sand entering the well. To pump the sand, they run a work string (tubing), stab into the lower completion and pump the job. When done, they pull out (which is where they're having difficulty) and run in upper completion. The lower completion stays in place. The equipment is designed to unlatch after the pump job, but seems to be stuck. Hopefully they can recover it. I don't know the POS of the CT operation. If they can't unlatch, I would have thought they'll cut the work string above the sticking point and run the upper completion anyway, but that's pure speculation. Hope this helps. If you need me to explain any part in more simpler terms let me know.