Method of drilling a stable borehole

Details Method of drilling a stable borehole Method of drilling a stable borehole

E - Fixed Constructions

21

B

E21B 7/00 (2006.01) E21B 7/18 (2006.01) E21B 43/00 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2621655

A method of drilling a stable borehole in a formation containing a stress field having a direction of maximal stress, whereby the borehole is drilled with an elongated non-circular cross sectional contour along an axis of elongation and whereby a directional component of the axis of elongation is kept oriented substantially parallel to the direction of maximal stress.

La présente invention concerne un procédé de forage d~une carotte stable dans une formation contenant un champ de contrainte ayant une direction de contrainte maximale, la carotte étant forée avec un contour de section transversale non circulaire allongé le long d~un axe d~allongement et une composante directionnelle de l~axe d~allongement restant orientée pour l~essentiel parallèlement à la direction de contrainte maximale.

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