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Gold/Mining/Energy : KOB.TO - East Lost Hills & GSJB joint venture -- Ignore unavailable to you. Want to Upgrade?

To: grayhairs who wrote (4002)	8/16/1999 9:27:00 PM
From: Salt'n'Peppa	Read Replies (4) \| Respond to of 15703

Evening Grayhairs, Yes, 2-16 TCF does require a little narrowing down. LOL <<< S&P, do you have any definitive info that conclusively indicates the lost circ is to the second\lower sand and not simply a consequence of a breakdown of the plug of the lost circulation zone encountered in the first sand ?? >>> NO! All I have to go on is a drill break on entering the second sand. However, I have sat many wells that have encountered lost circulation that had to be plugged. Several things lead me to believe that it was the lower sand that took a drink this time around. 1) It is my understanding that LCM sets like concrete. I appreciate that an LCM plug can let go, but realistically it is not following the "kiss" rule (kiss = keep it simple stupid). 2) As you pointed out, under normal circumstances, the reservoir pressure should increase as we drill deeper into the Temblor (I think a normal gradient is about 1/3 psi per foot). Since the reservoir pressure in the lower sand should be greater than that in the upper sand, it makes sense that as we become underbalanced due to losses, fluid would preferentially flow from this unrestricted lower zone rather than try to punch past an LCM plugged zone. I put this question to a friend of mine and he pointed out that when an LCM plug is breached, there is usually just a trickle of fluid that gets past it. 3) It seems far too coincidental that following a brief period of fast drilling at 17,428 feet, we should suddenly lose circulation again in a previously plugged zone at around 17,200 feet. It just makes total sense to me that the second sand took the drink of drilling mud. This all leads to the next speculative question of where the gas is coming from, and I'm afraid I have absolutely no response to that. Have a great evening, S&P