E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/06 (2006.01) E21B 7/20 (2006.01)
Patent
CA 2173585
A drilling head (12) for making a borehole (18) along a predetermined underground path is formed by a tubular body (22) having a guidable rotary drilling sub normally axially mounted in the body by means of a sleeve bearing (36) journalling a drill bit (40) equipped rotary drilling string sub joint moveable with and within the sleeve bearing for disposing the drilling bit (40) on a predetermined angle in a predetermined direction relative to the longitudinal axis of the body (22) by means of diametrically opposite superposed pairs of wedges (28-29), (30-31) interposed between respective end portions of the sleeve bearing and the inner periphery of the body.
Une tête de forage (12) servant à percer un trou (18) le long d'une voie souterraine prédéterminée est formée d'un corps tubulaire (22) doté d'un raccord de perçage rotatif, orientable, monté axialement et perpendiculairement dans le corps au moyen d'un palier à douille (36) faisant tourbillonner un foret (40) pourvu d'un joint de raccord de tige rotatif pouvant se déplacer avec et dans le palier à douille, ceci afin de positionner le foret (40) à un angle prédéterminé, dans un sens prédéterminé par rapport à l'axe longitudinal du corps (22) à l'aide de paires superposées, diamétralement opposées, de clavettes (28-29, 30-31) intercalées entre des sections terminales respectives du palier à douille et la périphérie interne du corps.
Borden Ladner Gervais Llp
Hale Robert G.
LandOfFree
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