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

To: Greg R who wrote (4095)	8/19/1999 7:19:00 AM
From: 1st.mate	Read Replies (1) \| Respond to of 15703

So, You feel that more gas is a bad thing????(LOL)Matey

To: Greg R who wrote (4095)	8/19/1999 11:12:00 AM
From: grayhairs	Read Replies (3) \| Respond to of 15703

Good morning Greg, <<As they penetrate higher pressure zones, is not the gas flowing up to the lower pressure zone where the first well is sealed off? No, the mud column in the wellbore prevents (when things are working according to Hoyle !!) stops any fluids from entering the new wellbore and crossflowing between zones. When things are not working according to Hoyle (and they are flaring gas at surface), the flow "potential" is up the wellbore and not between zones. <<Would that not put additional pressure on the plug and can it take it?>> The actual cement "plug" is thousands of feet long. It will hold whatever is thrown at it now !! Besides, and even more important, during the kill operation of the blowout well, cement was actually injected out of the wellbore and into the rock pore space immediately surrounding the wellbore. That "blocked off" all pathways by which gas could enter the old wellbore. That plug is there to stay, Greg. <<As well, is the transfer of gas from the lower high pressure zones to the lower pressure higher zones not tending to change the reserve level at each level?>> First, I'm going to re-iterate that the relative pressure levels of the zones is only "speculation" until actual pressures are measured. I do know what the experts on site "think" the relative pressures are, and while I agree with their "speculation", I'm telling you (and they would agree) that they will NOT actually "know" definitively until they have actual pressure measurements. IF there were any crossflow between zones, theoretically the transfer would work to bring the zones into pressure equilibrium over time. But, the time required to do so would be extremely long (many years). First, for relatively small pressure differences between the zones, the flow rates would be small (perhaps in the order of 2-3 MMCF/d versus the 100+ MMCF/d observed when the blowout flowed against NO backpressure). Second, both the flowing zone and the receiving zone are "damaged" from drilling operations. So, while one zone may actually be capable of flowing gas, the other zone may not be capable of "accepting" much, if any, flow. Third, you will recall that the blowout persisted for many months and saw the removal of several BCF of gas, a swack of condensate and about 3 MMbbls of water from the top zone. All that flow and no "change" of reservoir pressure. That is the entire essence of how we know the top reservoir sand is so HUGE !!! So, in reverse, even if a similar large amount of gas were to flow into the upper zone by wellbore crossflow, there'd still be no "perceptible" change in pressure of that top zone. I hope this answers your most thoughtful but unnecessary concerns. Later, grayhairs