초록 ▼

Well drilling apparatus including a powered drilling unit connectable to the upper end of a drill string and adapted to rotate it to drill a well, and a vertically extending guide track structure which guides the drilling unit for movement along the axis of the well, with a portion of the guide trac

Well drilling apparatus including a powered drilling unit connectable to the upper end of a drill string and adapted to rotate it to drill a well, and a vertically extending guide track structure which guides the drilling unit for movement along the axis of the well, with a portion of the guide track structure being mounted for swinging movement between a drilling position in which the drilling unit is aligned with the axis of the well and a slightly inclined position in which the track structure guides the drilling unit for movement along an inclined axis in alignment with a mousehole, and with the drilling unit also preferably being mounted for movement to a laterally retracted position at a side of the well in which it leaves an area along the axis of the well unobstructed for use of conventional hoisting equipment in making a ‘round trip’of the drill string out of and then back into the well.

대표청구항 ▼

Well drilling apparatus comprising: a mast or derrick; a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; a pair

Well drilling apparatus comprising: a mast or derrick; a drilling unit including an element adapted to be connected to the end of a drill string for rotation therewith about the axis of the string, and a motor operable to drive said element and the connected string rotatively about said axis; a pair of elongated first guide rails; a pair of shorter second guide rails forming lower extensions of said first rails; a carriage by which said drilling unit is carried and engaging said rails for movement therealong between an upper position of guided engagement with said first rails and a lower position of guided engagement with said second rails; pivotal connection means mounting said first rails near their upper ends for swinging movement of said first rails and said second rails and said carriage and carried drilling unit relative to said mast or derrick between drilling positions in which said carriage and drilling unit are guided by said first and second rails for movement along said axis of the drill string and inclined positions in which the first and second rails extend at an angle to said axis and guide the carriage and drilling unit for movement along an inclined path at an angle to the axis for access to a mousehole; and a connection mounting at least one of said second rails to a corresponding one of said first rails for movement therewith between said drilling and inclined positions, and for swinging movement relative thereto with said carriage and drilling unit to move the drilling unit from an active position of alignment with said axis to a retracted position at a side of the axis.