Drilling tool intended to widen a well
AssigneeDiamant Boart Stratabit S.A.
InventorRene Deschutter
Life of this patent
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Abstract
The drilling tool (1) intended to widen a drilling well bears a series of helical arms (3) resting at a first end on a first fixed flange (4) so as to be able to turn on themselves by a portion of a turn under the control of a rotating ring (9) driven by an opening mechanism (10) controlled by a variation in the pressure of the drilling fluid, while the other end of the arm (3) slides along a groove (21) provided in a second flange (5).
Claims17
Drilling tool (1) intended to widen a drilling well comprising a hollow cylindrical body (2) bordered at its ends by a first and second fixed flange (4, 5), each flange being provided with threaded joints for connecting it to a set of drill pipes, characterised in that it bears at least one curved arm (3) resting at a first end on the first fixed flange (4) so as to be able to turn on itself by a fraction of a turn around an axis (AA'), under the control of a tool opening mechanism (10), while the other end of the arm slides along a guide member (21) provided in the second flange (5).
Dependencies are inferred from the claim text.