Suche in nationalen und internationalen Patentsammlungen

1. (WO1992018746) BLOCKING ROBOT FOR HIGH-PRESSURE OIL WELLS

Pub. No.:    WO/1992/018746    International Application No.:    PCT/FR1992/000323
Publication Date: Fri Oct 30 00:59:59 CET 1992 International Filing Date: Sat Apr 11 01:59:59 CEST 1992
IPC: E21B 33/02
Applicants: FERRAYE, Joseph
Inventors: FERRAYE, Joseph
Title: BLOCKING ROBOT FOR HIGH-PRESSURE OIL WELLS
Abstract:
A robot for sealing and blocking pipes which are subject to very high pressure. The robot comprises a counter-pressure device below the main blocking portion for simultaneously acting on the inner wall, at depth in the pipe, by expansion caused by a single linear movement of a tapered shaft in a cylinder having therein a tapered bore; said shaft having a diameter which is 50 % greater than the difference between the inner taper diameters of the two ends of the cylinder, which cylinder has a slot running the full length thereof and is controlled by hydraulic jacks; a centre pipe allowing oil flow and normalising the upward pressure during the insertion process; and two pantographs for centering the system in the well in spite of the very high pressure. The high pressure in the well helps ensure blocking of the system.