发明公开
- 专利标题： Flexible Drill Shaft
- 专利标题（中）： 灵活的Bohrwelle
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申请号： EP07106674.0申请日： 2007-04-20
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公开(公告)号： EP1983148A1公开(公告)日： 2008-10-22
- 发明人: Teixeira, Jose
- 申请人： Services Pétroliers Schlumberger , Schlumberger Technology B.V. , Schlumberger Holdings Limited , PRAD Research and Development N.V.
- 申请人地址： 42, rue Saint Dominique 75007 Paris FR
- 专利权人： Services Pétroliers Schlumberger,Schlumberger Technology B.V.,Schlumberger Holdings Limited,PRAD Research and Development N.V.
- 当前专利权人： Services Pétroliers Schlumberger,Schlumberger Technology B.V.,Schlumberger Holdings Limited,PRAD Research and Development N.V.
- 当前专利权人地址： 42, rue Saint Dominique 75007 Paris FR
- 代理机构： Hyden, Martin Douglas
- 主分类号： E21B7/06
- IPC分类号： E21B7/06 ; E21B17/20 ; E21B17/22
摘要：
A flexible drill shaft for drilling lateral boreholes comprising:
a helical outer wire coil spring; and
at least one inner helical wire coil spring residing concentrically within the outer coil spring, with the coils of adjacent springs having an opposite pitch;
wherein the wire forming each helical spring has a cross section such that when the drill shaft is in a straight alignment there is planar contact between adjacent coils of the spring. There may be grooves (3) and ridges (2) on the contact surface of the coils.
a helical outer wire coil spring; and
at least one inner helical wire coil spring residing concentrically within the outer coil spring, with the coils of adjacent springs having an opposite pitch;
wherein the wire forming each helical spring has a cross section such that when the drill shaft is in a straight alignment there is planar contact between adjacent coils of the spring. There may be grooves (3) and ridges (2) on the contact surface of the coils.
公开/授权文献
- EP1983148B1 Flexible Drill Shaft 公开/授权日：2011-04-06
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