发明名称 |
Abandonment of offshore oil wells |
摘要 |
A method and apparatus for abandonment of an underwater well head which includes a strip of capped concentric casings (36) with at least one casing supported within another casing by a suspension arrangement, comprises explosively severing the casings a pre-defined distance below the mud-line (37). To achieve this one or more caps (38) are removed from a relevant casing or casings by application of rotational torque to the cap and reacting such torque to an outermost casing (39), using a torque reaction tool (40) secured to the top of the casing (39) and having a platform (41) to receive a hydraulic tongs (42). The tongs (42) serve to apply rotational force to the shaft (43) of a tool (44) engaged with the cap with the torque reaction of such force being taken-up by a cable attached between the tongs (42) and the reaction tool (40) and co-acting with abutments (45) so that the torque is transferred to act on the casing (39). <IMAGE> |
申请公布号 |
GB2285077(A) |
申请公布日期 |
1995.06.28 |
申请号 |
GB19940025197 |
申请日期 |
1994.12.12 |
申请人 |
* OCEAN TECHNICAL SERVICES LTD |
发明人 |
DAVID * DIXON |
分类号 |
E21B19/00;E21B29/02;E21B29/12;E21B33/035 |
主分类号 |
E21B19/00 |
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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