(19)

(11)

EP 1 330 609 A1

(12)

(43) Date of publication: 30.07.2003 Bulletin 2003/31 (21) Application number: 00978303.6 (22) Date of filing: 31.10.2000

(51) International Patent Classification (IPC)7: F15B 15/18 (86) International application number: PCT/US0029/972 (87) International publication number: WO 0203/6968 (10.05.2002 Gazette 2002/19)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (71) Applicant: Halliburton Energy Services, Inc. Carrollton, TX 75006 (US)	(72) Inventors: SCHULTZ, Roger, L. Aubrey, TX 76227 (US) WATSON, Brock, W. Carrollton, TX 75006 (US) MICHAEL, Robert, K. Plano, TX 75023 (US) MASINO, James, E. Houston, TX 77094 (US) (74) Representative: Curtis, Philip Anthony et al A.A. Thornton & Co.,235 High Holborn London WC1V 7LE London WC1V 7LE (GB)