发明名称 |
FremgangsmÕte ved horisontalboring av fjellformasjoner |
摘要 |
<p>The method includes the step of causing a specially-configured drill bit (102) at one end of a drill string (104) to intermittently rotate as it digs in, stops rotation until the rock fractures, and then moves after fracture in a random, orbital intermittent motion. Preferably the drill string (104) is rotated under pressure at a substantially constant rotational velocity at the other end of the drill string by a conventional directional drilling machine. A fluid (not shown) may be pumped into the drill string (104) and out the drill bit (102) to lubricate the hole and disperse cuttings. <IMAGE></p> |
申请公布号 |
NO980488(A) |
申请公布日期 |
1998.08.06 |
申请号 |
NO19980000488 |
申请日期 |
1998.02.04 |
申请人 |
RAILHEAD UNDERGROUND PRODUCTS LLC |
发明人 |
COX, DAVID M. |
分类号 |
E21B7/04;E21B3/00;E21B7/06;E21B7/08;E21B10/26;E21B10/36;E21B10/56;E21B10/60;E21B17/046;E21B47/01;(IPC1-7):E21B7/04;E21B4/16 |
主分类号 |
E21B7/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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