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Hydraulic circulating system
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
A method used to drill a borehole wherein water or a mud-laden liquid is circulated through the drill string during drilling. see diamond drill.
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Swivel barrel, английский
A misnomer applied to a swivel-type double-tube core barrel; also, the inner tube of a like^type core barrel.
Fusion piercing, английский
A method of producing vertical blast-holes by virtually burning holes in rock. the burning device is essentially a long blowpipe consisting of three tubes equipped with jets at the bottom end. two of the tubes carry kerosine and oxygen, which, when jetted together and ignited, generate a flame having a temperature of about 4,000° f. this flame is directed downward against the rock, superheating a circular area. a following jet of water cools the heated rock, causing it to contract and spall, or, if partially molten, to granulate. the resulting steam evacuates the spall from the hole and also keeps the burner from melting. also commonly, although incorrectly, called jet piercing. see linde drill.
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