Talk:Drilling rig
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[edit] Drilling Companies
Can somebody write articles on these companies - Blastcube 07:37, 11 June 2006 (UTC)
- Drill Corp
- Layne Drilling
- Boart Longyear
- Wallis Drilling
[edit] Images which need articles
- Drill_bit_tricone_new.jpg (Drilling bits)
- minipiling.JPG (Minipiling drilling rig)
- MC Drill Rig.jpg (Multi-combination drilling rig, capable of both diamond and RC drilling)
It would be good to get a higher resolution image of a drill bit from an RC rig and a diamond rig. The image here is a less commonly used diamond drill bit and image resolution is very low, unfortunately - Blastcube 07:37, 11 June 2006 (UTC)
Mike wai 00:16, 24 January 2007 (UTC)
[edit] Diamond drilling vs RC
Article currently reads:
"Diamond drilling is much slower than reverse circulation (RC) drilling due to the hardness of the ground being drilled. Drilling of 1200 to 1800 metres is common and at these depths, ground is mainly hard rock. Diamond rigs need to drill slowly to lengthen the life of drill bits and rods, which are very expensive."
My expertise is in oilwell drilling technology, but I would think what the "core-drilling" industry calls "Diamond Drilling" is slower solely because of "the hardness of the ground being drilled." Reverse circulation per se has nothing to do with it, but may be a better method for other reasons at the deeper depths. (However, if water or mud is being used, the additional head of the liquid in the annular area does indeed change the stress conditions at the bottom of the hole -- possibly enough to cause the rock failure mode to become plastic rather than elastic -- and can slow down penetration rate. But this effect is trivial with air as the circulating fluid.)
Diamond bits are more expensive than milled-cutter steel bits, but are the rods also "very expensive" enough to mandate drilling slowly (e.g., to minimize external wear)? I wouldn't think so unless we're talking about very high RPM in the other drilling applications. In any event, the optimum RPM and WOB (weight-on-bit) in hard and abrasive rocks probably are different from those used in softer rock. Again I suspect "Diamond rigs" drill slowly because the rock is hard and not for any other reason.
Also, in oilwell drilling the following terminology is used:
1) Conventional circulation: Mud down the drill pipe and up the borehole annulus 2) Reverse circulation: Mud down the borehold annulus and up the drill pipe. This is rarely used as a drilling technique because of need for a special rotating pressure pack-off at the surface and danger of the drill pipe becoming plugged with rock cuttings.
I'll clarify this eventually in the main article.
Finally, the drill "rods" the article describes with the drilling fluid going up or down in a dual-walled tube would be called "concentric drill pipe" in the oilwell drilling industry -- but is rarely used.
Irv Smith —The preceding unsigned comment was added by Casey56 (talk • contribs) 17:23, 8 December 2006 (UTC).
[edit] RC Drilling or dual-wall percussion hammer RC drilling?
It is a little unclear to me what is described in the article as RC drilling, maybe this is a regional thing? It sounds similar to what I know as dual-wall percussion hammer drilling with reverse circulation. To me, reverse circulation is a term which describes merely the direction of flow of the drilling fluid/air, as Irv writes. It would be great if whoever wrote the section could take another stab to explain it better since it looks very interesting. Anyway, all in all, the entire drill(ing) rig article needs mucho helpo. Drillerguy 22:51, 9 May 2007 (UTC)
[edit] Related articles need help
Borehole, water well, etc. could use help from a variety of perspectives. If you are contributing here, please have a look at those articles as well. Thanks! Drillerguy 05:32, 25 September 2007 (UTC)
