RISER THAT IS TO BE DETACHED NEAR THE WATER SURFACE

Title:

RISER THAT IS TO BE DETACHED NEAR THE WATER SURFACE

Document Type and Number:

WIPO Patent Application WO/1997/018380

Kind Code:

A1

Abstract:

A floating vessel carrying a digging apparatus with a required offshore structure for digging a well in the sea bed. A riser extending from the vessel into the well in the sea bed surrounds a drill string so as to provide a circulation of dug muddy water and dug fluid. This riser is constituted by at least two segments that can detachably be connected to each other, and one of the two can move together with the floating vessel, while the other stays at a predetermined location until the two segments are connected to each other again by providing buoyancy. A riser system for use for a producing operation is also provided that comprises at least two detachable segments.

More Like This:

JP5869414	Underwater construction equipment
WO/2006/010906	IMPROVEMENTS IN OR RELATING TO SUBSEA DRILLING

Inventors:

KOGURE EIJI
MACKIE MICHAEL J
MCCALLA JEFFREY M
HAYASHI HIROICHI

Application Number:

PCT/JP1996/003242

Publication Date:

May 22, 1997

Filing Date:

November 06, 1996

Export Citation:

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Assignee:

JAPAN DRILLING CO LTD (JP)
JAPAN NATIONAL OIL (JP)
MITSUI SHIPBUILDING ENG (JP)
MITSUBISHI HEAVY IND LTD (JP)

International Classes:

E21B7/128; E21B17/01; E21B17/08; E21B33/038; (IPC1-7): E21B17/01

Foreign References:

JPS5537814Y2

1980-09-04

Other References: