RE:JarringWell Dfly, First of all I think that you're not some unbalanced keyboard warrior with nothing better to do. You sound more like a drilling or exploration manager or maybe even higher up so I'll tell you about our experience on Hibernia O-35, Mobil's first step out well after the initial discovery back in 1979.
Baroid sent me out there barely 2 years out of mud school because they liked how I asked a lot of questions like we are discussing right now. Ok so you know that you can easily get differentially stuck after having the pipe sit in the hole inactive with no movement, not even rotation. On O-35 the exact same situation that you describe occured. Drilling away, then drilling break, then bang, huge massive kick. Shut well in. Now drill string does not move. Took mud weight from around 12 ppg if memory serves to over 16 ppg. Kill well. Open up rams. Pipe is differentially stuck. Spot chemicals, jar for over 2 days, rig shaking. Run wireline free point, shoot off just above the heavy weight and leave BHA, collars and heavy weight in the hole. Fill up hole with cement, run bridge plug with cement on top in succession all the way up the hole.
Ok so maybe they took a kick in the zone that you are talking about, killed it, avoided getting differentially stuck or did get stuck but managed to jar free and realized that they needed to go to some kind of low solids mud with sized calcium carbonate to plug up formation pore spaces in order to lower differential pressures between formation and hole. For some reason the number "4.54" rings a bell. Can't think of what it is right now. I'll let you know if I remember anything.
Regarding sp I already told you my theory via private message, which is why I'm holding off buying right now, but I will jump in once I see Olive Oyl hook up with Popeye.