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Gold/Mining/Energy : Ultra Petroleum (UPL)
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To: ISPYOIL who wrote (4096)5/2/1999 3:25:00 PM
From: Gerald Atwater  Read Replies (2) of 4851
 
ISPYOIL --
After a few more readings of your post (and a lot more 80 proof) I "see" more clearly. Does this layman's paraphrase track your post at all?

Gas moves from an area of higher pressure to an area of lower pressure. (The size of the reservoir remains constant.) The sharper the drop in the pressure, the quicker will be the movement of the gas. If the flow of gas out of the well is restricted by a choke, the pressure drop will be less and the movement of gas toward the well will slow. If the choke is opened, the pressure will drop quicker, and the movement of gas toward the well will quicken. The movement of gas within the reservoir will cause gas from outside the reservoir to move into the reservior, replacing what has left.

The hyperbolic decline occurs when the gas within the vicinity of the well fractures has mostly been produced into the sales line. Replacement gas is still moving into this area but never at a fast enough rate to restore the original amount of gas because of the tight sands and the higher pressure as the distance of the gas from the well increases. But still at a faster rate than with a restricted choke because of the lower resultant pressure. Thus more total gas produced.

The flow is asymptotic because it will never reach zero, only increasingly slowly approach it.

Am I too far out of sync with your post?

GAtwater

(I have no idea whether any of this has any validity or not.)
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