To: alchemy who wrote (1615 ) 11/30/1997 12:00:00 PM From: Michael T Currie Read Replies (1) | Respond to
> How difficult is it to drill one well to access two reservoirs as
mentioned in their last release? How expensive are these wells?
<<On Dec. 1, 1997 the company will commence the drilling of 2 wells to
the D Sands, 2 wells to the D Sands and Niobrara Formation and 2 wells
to the Niobrara Formation for a total of six wells.>>
Not difficult at all, as long as the fluids and pressures are similar. It does increase the completion costs, particularly if one of the targets has to be acid treated or fracture stimulated. The chalk could respond well to either.
> What the heck is a "down dip on the structure"? What are they doing
here?
<<Well No. NX97323A: a Niobrara Formation test drilled to depth of
2,800-ft. flowed after a six day test at 208MSCF at 420psi through a
28/64-inch choke. This well is 40 ft. down dip on the structure and
helps to determine the size of the reservoir. >>
If you think of a hydrocarbon-bearing reservoir in its simplest terms as an inverted bowl shape, the crest is the highest (shallowest) point on the bowl. This is the point that is the farthest vertically away from the water, which of course is heavier than either oil or gas. '40 ft. down dip on the structure' means that the well penetrated the reservoir 40 feet lower than the crest. In other words, if you dropped a line vertically 40 feet down from the crest (inside the bowl) then extended that point out horizontally to the outside of the bowl, you would have the position of the well. The question becomes how much farther downdip can you go until you hit water. Could be 5 feet, in which case this well would produce water very quickly, or it could be 50+ feet, where it could produce water free for quite a long time. No telling with the available information.
Mike
