On Wed, 16 Feb 2005 06:15:25 GMT, "Martin H. Eastburn"
wrote:

approached.
Consider a 5000 foot hole - not the deepest by any means. That is 5000 feet
of drill pipe above it. Then the heavy drill head of three rotating cutters.
The pressure is very high. The temperature is static vary high and is boosted
by the grinding of rock with rock. Forced water or fluid is driven down the tube
through the center of the cutter (sounds like a mill doesn't it) and the now
dirty, grimy dust is forced upward around the sides of the drill tube.
I suspect the point contact temperature and pressure is extremely high. Few
really know as much of it is protected under patents. Bound to be some in
theory books and now the web.

Ive pulled more than one string of drill pipe to find the bit melted
down because the weight scale on the drilling line was fooked up and a
hell of a lot more weight was allowed on the bit than was proper

Gunner

Rule #35
"That which does not kill you,
has made a huge tactical error"