CLOSED LOOP FLUID-HANDLING SYSTEM FOR USE DURING DRILLING OF WELLBORES - Patent 0897454

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EP 0 897 454 A1

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(43)	Date of publication:
	24.02.1999 Bulletin 1999/08

(21)	Application number: 97922650.0

(22)	Date of filing: 05.05.1997

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International Patent Classification (IPC):

E21B 21/ 06^{( . )}
E21B 44/ 00^{( . )}

E21B 21/ 14^{( . )}
E21B 21/ 00^{( . )}

(86)	International application number:
	PCT/US1997/007533

(87)	International publication number:
	WO 1997/042395 (13.11.1997 Gazette 1997/49)

(84)	Designated Contracting States:
	BE DE FR GB IT NL

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Priority:

03.05.1996 US 19960642828
29.10.1996 US 19960030752P

(60)	Divisional application:
	00112899.0 / 1048819

(71)	Applicant: BAKER HUGHES INCORPORATED
	Houston Texas 77027 (US)

(72)	Inventors:
	BRADFIELD, David H. Wantage, Oxfordshire OX12 7NQ (GB) CUMMINS, David P. J. Newbury, Berkshire RG20 9HG (GB) BRIDGER, Philip J. Rugby, Warwickshire CV23 0XB (GB)

(74)	Representative: Finck, Dieter, Dr.Ing., et al
	Patentanwälte v. Füner, Ebbinghaus, Finck Mariahilfplatz 2 - 3 81541 München 81541 München (DE)

(54)	CLOSED LOOP FLUID-HANDLING SYSTEM FOR USE DURING DRILLING OF WELLBORES