(19)

(11)

EP 1 702 136 A1

(12)

(43) Date of publication: 20.09.2006 Bulletin 2006/38 (21) Application number: 04798666.6 (22) Date of filing: 25.11.2004

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 34/10(2006.01) E21B 34/06(2006.01) (86) International application number: PCT/GB2004/004961 (87) International publication number: WO 2005/056980 (23.06.2005 Gazette 2005/25)

(84) Designated Contracting States: FR GB (30) Priority: 09.12.2003 GB 0328440 (71) Applicant: Vetco Gray Controls Limited Bristol BS48 1BS (GB)	(72) Inventors: DOUGLAS, Neil Clevedon, North Somerset BS21 7DS (US) ASSKILDT, Knut N-1390 Vollen (NO) YAGHMAI, Sohrab N-1254 Oslo (NO) JOHANNESSEN, Svein N-0376 Oslo (NO) (74) Representative: Newstead, Michael John et al Page Hargrave Southgate Whitefriars Lewins Mead Bristol BS1 2NT Bristol BS1 2NT (GB)