发明名称 |
Axial balancing device for downhole drilling motors. |
摘要 |
<p>A downhole drilling motor is described which has an outer drill casing (11), a shaft (12) for driving a drill bit connected thereto, and the shaft (12) being rotatable relative to the casing (11). A turbine (15) is disposed between the casing (11) and the shaft (12) to permit the shaft (12) to be rotated. A pressurised fluid can be admitted via an inlet (13) and is transmitted to the turbine (15) via a passage (20) to effect operation. The shaft is provided with reaction means which includes a sleeve (17) mounted on the shaft (12) and which sleeve and shaft have pressure surfaces (23, 24) which can be acted on by the pressure fluid to produce a force acting counter to the normal hydraulic thrust on the shaft (12) to produce a reduced resultant hydraulic thrust on the shaft (12). In a preferred arrangement, the reaction member and thrust bearing is located above the turbine (15) so that the unit can be replaced as a whole.</p> |
申请公布号 |
EP0209310(A2) |
申请公布日期 |
1987.01.21 |
申请号 |
EP19860305258 |
申请日期 |
1986.07.08 |
申请人 |
WEIR DRILLING LTD. |
发明人 |
RYALL, MICHAEL LESLIE;GRANT, ALEXANDER ANGUS;SMITH, ANTHONY MICHAEL;DOWNIE, ANDREW MCPHERSON;TAYLOR, JOHN MACFARLANE;DERRICK, JOHN |
分类号 |
E21B4/02;F03B13/02;(IPC1-7):F03B13/02 |
主分类号 |
E21B4/02 |
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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