发明名称 |
VACUUM, VACUUM-PRESSURE, OR PRESSURE REVERSE CIRCULATION BIT |
摘要 |
<p>VACUUM, VACUUM-PRESSURE, OR PRESSURE REVERSE CIRCULATION BIT Drill cuttings are effectively removed from the bottom of a bore before they can adversely affect the operation of the bit. The bit includes a body member rotatably supporting individual cutter members. A shield means projects from the body member proximate the cutter members. A first portion of the shield means has an outside diameter substantially equal to the outside diameter of the cutter means and substantially equal to the diameter of the bore and a second portion having an outside diameter substantially less than the outside diameter of the cutter members and substantially less than the diameter of the bore. A first passage extending through the bit is adapted to provide communication with a vacuum source to assist in removing the drill cuttings. A second passage extending through the bit is adapted to provide communication with a gas pressure source to assist in removing the drill cuttings. 1a</p> |
申请公布号 |
CA1048486(A) |
申请公布日期 |
1979.02.13 |
申请号 |
CA19760243678 |
申请日期 |
1976.01.16 |
申请人 |
DRESSER INDUSTRIES, INC. |
发明人 |
LANGFORD, JAMES W. (JR.) |
分类号 |
E21B10/18;E21B21/12;(IPC1-7):21B9/08;21B9/10 |
主分类号 |
E21B10/18 |
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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