Title:
水底削岩システム及び水底下方の地層を削岩する方法
Document Type and Number:
Japanese Patent JP4654324
Kind Code:
B2
Abstract:
A method for drilling formations below the bottom of a body of water includes disposing a drilling system on the bottom of the body of water. The formations are drilled by rotating a first drill rod having a first core barrel latched therein and advancing the drill rod longitudinally. At a selected longitudinal position, an upper end of the first drill rod is opened and a cable having a latching device at an end thereof is lowered into the first drill rod. The winch is retracted to retrieve the first core barrel. The first core barrel is laterally displaced from the first drill rod. A second core barrel is inserted into the first drill rod and latched therein. A second drill rod is affixed to the upper end of the first drill rod. Drilling the formation is then resumed by longitudinally advancing and rotating the first and second drill rods.
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Inventors:
Williamson, Michael Yee
Matsuginis, Timothy
Saatchiya, Herbert
Robinson, rally
Matsuginis, Timothy
Saatchiya, Herbert
Robinson, rally
Application Number:
JP2010506391A
Publication Date:
March 16, 2011
Filing Date:
April 15, 2008
Export Citation:
Assignee:
Williamson Deep Ocean Engineering Incorporated
International Classes:
E21B15/02; E21B7/128
Foreign References:
| US20060016621 | ||||
| US3670830 | ||||
| US4255068 | ||||
| US4043407 | ||||
| US3741320 | ||||
| US2937006 | ||||
| US4249619 | ||||
| US3279547 | ||||
| US20070119622 |
Attorney, Agent or Firm:
Patent business corporation Odashima patent office