RE: Mud losses12 Nov 2019 20:03
From Slipanchor.
"When does the actual mud losses take place, while drilling the horizontal through the fractures, or when the drilling string is removed?"
From AlfaMale.
"Whilst drilling."
AlfaMale, your answer is totally wrong and incorrect. If the formation is taking fluid, in 99% of cases it will continue to do so all the time, unless some sort of LCM has been added. (Not the case in HUR's operations to my knowledge.) It's true that while drilling, losses may be greater, due to ECD, (equivalent circulating density) which is too complicated to explain here in depth, but simplified, means that while drilling the fluid (in 'circulation') exerts a higher pressure on the formation due to friction-losses (backpressure) in the annulus.
But even when the well is open to the formation, the fluid not being 'circulated', losses will continue unless the fluid is in perfect 'balance' with formation pressure. These are called 'static losses', and are monitored frequently, and the hole is kept 'topped-up' to compensate.
Obviously, if one ends up waiting on weather for any length of time, with the hole experiencing static losses, more fluid has to be mixed or obtained to keep things 'topped-up', and maintaining safe pressure-control over things.
Hurricane will not have been drilling 'on balance', if for no other reason than regulations, even though WW is appraisal rather than exploration, so they'll have been using lighter fluid than on WD. And the rig's not equipped with MPD, which would allow them to do so. Ergo, if they were experiencing losses while drilling, they'll continue to do so with the well 'static', just to a lesser extent.