发明名称 |
EARTH DRILLING APPARATUS AND METHOD |
摘要 |
Well drilling and well casing placement are carried out by a process in which a drill string and surrounding casing are advanced while being rotated, preferably in opposite directions. The process is preferably carried out using a drill rig having a mast that is movable along its direction of elongation and a casing rotation table fixed to the mast.
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申请公布号 |
CA2775875(A1) |
申请公布日期 |
2012.11.30 |
申请号 |
CA20122775875 |
申请日期 |
2012.04.30 |
申请人 |
SCHRAMM, INC. |
发明人 |
SIM, DAVID Y.;BROOKOVER, BRIAN DAVID |
分类号 |
E21B15/00 |
主分类号 |
E21B15/00 |
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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