24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No.593 /DEL/1997 A (22) Date of filing of Application: 10/03/1997
(54) Title of the invention: “UNDERWATER INSTALLATION.”
(51) International Classification 7 : E21B 7/128,
E21B 7/132, E21B 43/01, E21B 43/013
(30) Priority Data:
(31) Document No.: 960997
(32) Date: 12/03/1996
(33) Name of convention country: NORWAY
(66) Filed U/s 5(2): NIL
(61) Patent of addition to application No.: NA
(62) Filed on: NA
(63) Divisional to Application No.: NIL
(64) Filed on: NA
Total No Of Page: 8
(57) Abstract
(71) Name of the applicant:
TERJE MAGNUSSEN
Address of the Applicant:
Oksevollveien 24,4500 Mandal, Norway.
(72) Name of the Inventor:
TERJE MAGNUSSEN
An underwater installation for use in offshore drilling of and production from, respectively, oil and
/or gas wells at deep and moderate deep water comprises an intermediate station in the form of a
buoyancy based hollow body (16) tension strut anchored at the seabed (10) and located at a depth
substantially closer to the surface of the sea than the seabed (10). At least one hydrocarbon
conveying pipeline extends between the buoyancy body (16) sand seabed depth, for the transfer of
hydrocarbons from, the reservoir to said buoyancy body (16). At least one casing liner string (18a-
18h) constitutes the tension leg/strut anchoring of the buoyance body (16).
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