2-stage underreamer

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/32 (2006.01) E21B 10/56 (2006.01) E21B 17/10 (2006.01) E21B 47/09 (2012.01) E21B 47/18 (2012.01)

Patent

CA 2204018

A 2-stage underreamer for use in a subterranean wellbore comprises a unitary body (2) having upper and lower blades (5A, 5B) and (6A, 6B) mounted in slots (3, 4) formed perpendicular to each other in the body. Separate upper and lower piston assemblies are provided for driving the blades (5A, 5B) and (6A, 6B) respectively from a storage configuration in which they are located substantially completely within the slots (3, 4) to a use position as illustrated in the figure. The blades each preferably comprise a steel arm having mounted thereon a base of tungsten nickel cobalt matrix in which diamond and/or tungsten carbide inserts are provided. A signal is given to the surface that the blades are in their extended position by changing the mud.

Cet élargisseur à deux étages, utile dans un puits de forage souterrain, comprend un corps (2) d'un seul tenant pourvu de lames supérieures (5A, 5B) et inférieures (6A, 6B) montées dans des fentes (3, 4) pratiquées perpendiculairement les unes aux autres dans le corps. Des ensembles pistons supérieur et inférieur sont montés afin d'entraîner respectivement les lames (5A, 5B) et (6A, 6B) d'une configuration de repos dans laquelle ces lames sont logées pratiquement complètement dans les fentes (3, 4), à une position d'utilisation telle qu'illustrée sur la figure. De préférence, chaque lame comprend un bras de lame en acier sur lequel on a monté une base de matrice en tungstène, nickel, cobalt, dans laquelle on a encastré des diamants et/ou des éléments en carbure de tungstène. Une indication est donnée à la surface que les lames se trouvent dans la position déployée en chargeant la boue.

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