发明名称 |
DOWNHOLE APPARATUS |
摘要 |
Downhole flow pulsing apparatus comprises a housing (14) for location in a drillstring, the housing (14) defining a throughbore to permit passage of fluid through the housing. A valve (27, 30) is located in the bore and defines a flow passage (29, 31). The valve includes a valve member (27) which is movable to vary the area of the passage (29, 31) to provide a varying fluid flow therethrough. A fluid actuated positive displacement motor (15, 16) is associated with the valve member (27). In a preferred embodiment, the apparatus is provided in combination with a drill bit (5) and a pressure responsive device, such as a shock-sub (3), which expands or retracts in response to the varying drilling fluid pressure created by the varying flow passage area. The expansion or retraction of the shock-sub (3) provides a percussive effect at the drill bit. |
申请公布号 |
WO9744565(A1) |
申请公布日期 |
1997.11.27 |
申请号 |
WO1997GB01343 |
申请日期 |
1997.05.16 |
申请人 |
ANDERGAUGE LIMITED;EDDISON, ALAN, MARTYN;HARDIE, RONNIE |
发明人 |
EDDISON, ALAN, MARTYN;HARDIE, RONNIE |
分类号 |
E21B4/02;E21B7/18;E21B7/24;E21B21/10;(IPC1-7):E21B21/10 |
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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