RE: ESP Switch on30 May 2020 19:49
proverloop,
Your post from Thursday:
"The plan was to commission the pumps, but restrictions on non essential personnel coming offshore at present has put this on the back burner. I can't see Hurricane actually using them anytime soon,(once they are commissioned) if the well or wells are flowing naturally, especially as we are still in the testing phase."
This is a technical thing which has been vexing my poor little brain for a couple of days now ! But at least it keeps me away from thinking about the SP, which is simply depressing.
My view differs from yours, in that I believe getting one of the ESP's on 7z into play asap might be a good idea. But not (when opened up) to increase production rate. But instead, to act as a 'stabilizing factor' as to that well's flow, which we've been told had become 'unstable', and that due to the excellent pressure communication factor with 6, risks making that well 'unstable' equally. Hence the shutin of 7z for now.
Right now, producing naturally, flow is going through the 'Y bypass' AROUND the ESP's. So the only 'limiting control mechanism' for that flow is the wellhead choke on the seabed. So if (as I suspect) the well is 'slugging' due to the water-cut, all sorts of weird pressure-transients are taking place all along the production string, including below the packer. This could be potentially damaging, especially if some sort of harmonic set itself up, leading to positive feedback.
However, with one of the ESP's on 7z was kicked in, it might (nb 'might', just opinion) act as a 'second choke', a lot closer to the OH than the wellhead choke. In other words, run the ESP, giving the same bottomhole drawdown pressure (ie no flow increase), but against a far more pinched-in wellhead choke setting.
I've a feeling this might not only tend to 'stabilise' things a bit (because you wouldn't have those transient pressure differences going up and down 2000 metres of tubing), but also by the oil / water mix going through the pump, it may homogeonise the 'mixture' somewhat, reducing 'slugs' of water, followed by 'slugs' of oil / gas running through the system.
Just thinking aloud here. Might be wrong.
Like others here, I thought the ESP VSD's were supposed to be in the comissioning phase during Jan / Feb. That was before this 'lockdown' idiocy. I hope it gets prioretised as things ease.