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Three / Four jobs in one go
This job started as all jobs do. Lots of paperwork and no one letting you start anything until you have met all their requirements. I wrote out four permits, two for one well and two for another and in the process killed a tree with all the msds datasheets, risk assessments and procedures they require. We had to wait a day for these to go through the daily permit meeting and after humoring their requirements, we were off. The plan was to leave the paperwork for the last well until we had finished these first two off. We started with the C11 line and after pumping some silicon, all the debris in the control line consolidated together and blocked the line. A blocked line meant that we had no chance of getting a fiber in the line.... the first failure of the job so far. After some messing around raising and dropping the pressure we decided to lock 8000psi in the control line and leave it for a few days to see if pressure and time is enough to break up the plug. The next well to work on was C06, this well had a fiber installed during 2006 but there had been a failure downhole and the fiber believed to have broken. The expectation / hope of this job was that the fiber was useless and we could go through the simple and drawn out procedure of installing a new one. BP had allocated three weeks for our work so the longer things took the more money we would get : - ) Unfortunately after a bit of pumping we managed to get temperature data all the way to the bottom of the well and through the reservoir. BP view a single ended system acceptable and better than spending another $100k on a new fiber, the time involved and the risk of it not working at all. End result we just had to splice everything up again and move onto something else. During the work on C06, the pressure on C11 managed to break up the plug and the pressure had fallen to zero. It took about four days but the pressure won in the end. To stop another plug forming we modified the procedure and pumped small amounts of silicon separately rather than one big slug. After pumping a few hundred liters of brine, silicon and diaqua the control line was deemed to be clean and we were ready to pump a fiber. We set up the deployment beam and started the pumping process. Because there is a hole in the control line somewhere in the reservoir region, the decision was made to only pump the fiber past the turn-around sub at the bottom of the well. We were to pump just enough fiber to get temperature data all the way from the top to the bottom of the well. Video showing fiber deployment 1 Video showing fiber deployment 2 Video showing fiber deployment 3 With these two job successfully completed the decision was made by BP to cancel the rest of the work. I attended a meeting on the platform where we went through all the risks of the C07 job. The big sticking point was that we would need to have enough brine to kill the well if anything went wrong; with this we would also need to use the rig pumps and have high pressure lines routed ready to kill the work at a moments notice. We would also require a couple of contractors from another company to supervise the work on the tree and they would need spare parts. End result BP decided that it would be too much of a headache and best to leave it till the next completion is run and everything will be in place. The final job was to pump a "Seal Tite" down one side of C11 to seal it up and permanently prevent reservoir pressure from migrating to the surface. After some confusion with onshore, the equipment was finally sent and BP angry about how late it happened. Unfortunately due to bedspace and pressure from BP onshore we had to down-man from four people to one. I volunteered to go at this point because I was sick of having to deal with excessive ignorance from one of my crew and just wanted some time without having to deal with the constant mess. After I left the platform I found out that the local guy messed up the job and didn't carry out the final pressure test as per the program. This guy had been the night shift supervisor and constantly broke the agreed program; every day I had to deal with the mess he left with the platform crew. At least the job was over and a relative success. Video showing 360 view of Well bay |