EP 0434924 B1 19930922 - APPARATUS FOR DRILLING AN OFFSET OR SIDE-TRACKED WELL, ESPECIALLY FROM A CASED WELL
Title (en)
APPARATUS FOR DRILLING AN OFFSET OR SIDE-TRACKED WELL, ESPECIALLY FROM A CASED WELL
Publication
Application
Priority
DE 3942438 A 19891222
Abstract (en)
[origin: EP0434924A1] The invention relates to an apparatus for drilling an offset or side-tracked well, especially from a cased well in underground rock or earth formations, having a deflector-wedge unit 2 which can be fixed in the well by means of a packer 1 as well as having a starting cutting tool 6, which can be fastened on a drill string 10 and is for cutting a well window, assigned to which is a deflecting guide 9, which is in effective connection with the deflector-wedge unit 2 and is for initiating a deflecting operation. In order in particular to be able to produce a well window with a reduced amount of work and consequently in less time, the deflecting guide 9 is arranged after the starting cutting tool 6 in the direction in which drilling progresses (Fig. 2).
IPC 1-7
IPC 8 full level
E21B 7/06 (2006.01); E21B 7/08 (2006.01); E21B 29/06 (2006.01)
CPC (source: EP US)
E21B 7/061 (2013.01 - EP US); E21B 29/06 (2013.01 - EP US)
Designated contracting state (EPC)
BE FR GB NL
DOCDB simple family (publication)
EP 0434924 A1 19910703; EP 0434924 B1 19930922; CA 2033048 A1 19910623; DE 3942438 A1 19910711; DE 3942438 C2 19920130; NO 905506 D0 19901220; NO 905506 L 19910624; US 5109924 A 19920505
DOCDB simple family (application)
EP 90120537 A 19901026; CA 2033048 A 19901221; DE 3942438 A 19891222; NO 905506 A 19901220; US 62823590 A 19901217