A drilling procedure in which a sharply pointed bit attached to a cable is repeatedly picked up and dropped on the bottom of the hole.



Related Terms

BUOYED UP

Lifted by a buoy, especially a cable that has been lifted to prevent it from trailing on the bottom.

M-DESIGN CORE BARREL

A double-tube core barrel in which a 21/2 -taper core lifter is carried inside a short tubular sleeve coupled to the bottom end of the inner tube, and the sleeve extends downward inside the bit shank to within a very short distance behind the face of the core bit.

ANCHOR CHARGE

A procedure that allows several charges to be preloaded in a seismic shot hole; the bottom charges are fired first, and the upper charges are held down by anchors.

CABLE DRILLING

Rock drilling in which the rock is penetrated by percussion, at the bottom of the hole, of a bit suspended from a wire line and given motion by a beam pivoted at the center.

MOORING LINE

A cable or rope used in securing a ship

RISE OF FLOOR

The amount by which the line of the outer bottom plating amidships rises above the base line, when continued to the moulded breadth lines at each side.

HAWSEHOLE

A hole for ship's cable

GUY DERRICK

A derrick having a vertical pole supported by guy ropes to which a boom is attached by rope or cable suspension at a distance the indications of the master gyro compass system.

BLASTHOLE

  1. A hole that takes a heavy charge of explosive. 2. The hole through which water enters in the bottom of a pump stock.

DIVING BELL

An early diving apparatus constructed in the shape of a box or cylinder without a bottom and connected to a compressed-air hose.

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