(19)

(11)

EP 0 094 383 A1

(12)

(43) Date of publication: 23.11.1983 Bulletin 1983/47 (21) Application number: 82900173.0 (22) Date of filing: 20.11.1981

(51) International Patent Classification (IPC):  E21B 19/ 15( . ) (86) International application number: PCT/US1981/001552 (87) International publication number: WO 1983/001810 (26.05.1983 Gazette 1983/13)

(84) Designated Contracting States: FR (71) Applicant: INGRAM CORPORATION New Orleans, LA 70139 (US)	(72) Inventors: FRIAS, Robert Odessa, TX 79761 (US) CAIN, Troy Dale Fort Worth, TX 76119 (US) GALLAGHER, John J., Jr. Jeanerette, LA 70544 (US) WATSON, William E. Layfayette, LA 70505 (US)