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(11)    Patent No :    AP 2054   
(21)    Application No :    AP/P/2005/003228   
(22)    Filing Date :    15.02.2005   
(24)    Date of Grant &    09.10.2009               
(45)    Publication :
(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    10/994,799    22.11.2004

(84)    Designated State

GM    GH   KE   MZ   NA   SL   T Z

(73) Applicant(s)

ANADARKO PETROLEUM CORPORATION, 1201 Lake Robbins Drive, The Woodlands, 77380,Texas, United States of America

(72) Inventors

MILLHEIM Keith, United States of America

MAIDLA Eric E, United States of America

KING Charles H, United States of America

et al

(74) Representative

FISHER CORMACK & BOTHA

(51)  International  Classification   E21B 33/038 (2006.01)    E21B 33/03 (2006.01)

(54)    Title

System and method of installing and maintaining an offshore exploration and production system having an adjustable buoyancy chamber

(57)    Abstract

A system and method of establishing an offshore exploration and production system is disclosed, in which a well casing is disposed in communication with an adjustable buoyancy chamber and a well hole bored into the floor of a body of water. A lower connecting member joins the well casing and the chamber, and an upper connecting member joins the adjustable buoyancy chamber and a well terminal member. The chamber's adjustable buoyancy enables an operator to vary the height or depth of the well terminal member, and to vary the vertical tension imparted to drilling and production strings throughout 10 exploration and production operations. Also disclosed is a system and method of adjusting the height or depth of a wellhead while associated vertical and lateral forces remain approximately constant. A variety of well isolation members, lateral stabilizers and anchoring means, as well as several methods of practicing the invention, are also disclosed.

(56)    Documents Cited :    US 4 448 766 A   GB 2 337 068 A   US 3 280 908 A

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