发明名称 |
Improvements relating to subsea drilling of boreholes |
摘要 |
<p>Apparatus and a method are described for drilling with casing in a borehole in a typically unconsolidated formation, wherein the method involves isolating the annulus between the casing and the borehole section from fluid circulation and creating a hydrostatic pressure in the annulus which is adapted to balance any over-pressurised water in the formation. <IMAGE></p> |
申请公布号 |
EP1050661(A2) |
申请公布日期 |
2000.11.08 |
申请号 |
EP20000303819 |
申请日期 |
2000.05.05 |
申请人 |
BBL (DOWNHOLE TOOLS) LIMITED |
发明人 |
WARDLEY, MIKE;STRONG, PHILIP |
分类号 |
E21B7/12;E21B21/08;(IPC1-7):E21B7/18;E21B7/20 |
主分类号 |
E21B7/12 |
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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