EP 0298663 A3 19900103 - DOWNHOLE CUTTING TOOL
Title (en)
DOWNHOLE CUTTING TOOL
Publication
Application
Priority
GB 8716040 A 19870708
Abstract (en)
[origin: EP0298663A2] The tool, for example an underreamer for descaling a casing (46), has an upper body (10) telescoped within a lower body (12) on which are pivoted operating arms (22). The arms (22) are deployed from a retracted to an extended position by the hydraulic pressure of drilling mud pumped through a through-bore (18) against a shoulder (26) causing the upper body (10) to move within the lower body (12), which movement pivots the arm (22) via camming surfaces (28,29). In the fully extended position, an outer surface (44) of the arm (22) acts as a locating pad, and the arm is mechanically locked by mating surfaces (34,36).
IPC 1-7
IPC 8 full level
E21B 10/32 (2006.01); E21B 37/02 (2006.01); E21B 37/04 (2006.01)
CPC (source: EP)
E21B 10/322 (2013.01); E21B 37/02 (2013.01); E21B 37/04 (2013.01)
Citation (search report)
- [X] US 4565252 A 19860121 - CAMPBELL THOMAS R [US], et al
- [X] US 2756968 A 19560731 - VINCENT EMANUEL, et al
- [Y] US 2823901 A 19580218 - KAMMERER ARCHER W
- [A] US 3196960 A 19650727 - KAMMERER ARCHER W
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0298663 A2 19890111; EP 0298663 A3 19900103; GB 8716040 D0 19870812; NO 883016 D0 19880706; NO 883016 L 19890109
DOCDB simple family (application)
EP 88305962 A 19880629; GB 8716040 A 19870708; NO 883016 A 19880706