EP 0007825 A3 19800220 - UNDERWATER DRILLING METHOD AND APPARATUS RELATING THERETO
Title (en)
UNDERWATER DRILLING METHOD AND APPARATUS RELATING THERETO
Publication
Application
Priority
FR 7819897 A 19780704
Abstract (en)
[origin: US4255068A] The method consists in boring a shaft in the sea floor to form a drilling station of sufficient size to accommodate personnel and equipment, in lining the shaft walls with a casing which is cemented against the walls and surmounted by a water-tight self-contained subsea chamber, in extracting sea water from the shaft, in maintaining atmospheric pressure within the shaft and the subsea chamber, in lowering personnel and drilling equipment into the shaft and in carrying out drilling operations from the bottom of the shaft.
IPC 1-7
IPC 8 full level
E21B 7/124 (2006.01); E21B 17/02 (2006.01); E21B 21/00 (2006.01); E21B 33/037 (2006.01)
CPC (source: EP US)
E21B 7/124 (2013.01 - EP US); E21B 17/02 (2013.01 - EP US); E21B 21/001 (2013.01 - EP US); E21B 41/06 (2013.01 - EP US)
Citation (search report)
- [A] US 4055224 A 19771025 - WALLERS RICHARD A
- [A] DE 2638121 A1 19780309 - TELLER ROBERT
- [X] FR 2183428 A5 19731214 - VOISIN MARCEL [FR]
- [X] GB 160865 A 19210407 - JAMES FORGIE
- US 2937006 A 19600517 - THAYER CLARENCE H
- [X] US 2747840 A 19560529 - THEODORE MILES
- [A] FR 2047934 A1 19710319 - ACF IND INC
- GB 330433 A 19300612 - MATVEY ALCUNOVITCH CAPELIUSHNI
Designated contracting state (EPC)
DE GB IT NL SE
DOCDB simple family (publication)
EP 0007825 A2 19800206; EP 0007825 A3 19800220; EP 0007825 B1 19830209; DE 2964704 D1 19830317; FR 2442953 A1 19800627; FR 2442953 B1 19830318; US 4255068 A 19810310
DOCDB simple family (application)
EP 79400435 A 19790628; DE 2964704 T 19790628; FR 7819897 A 19780704; US 5223779 A 19790626