Arrangement for full hole drilling

E - Fixed Constructions – 21 – B

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E21B 33/13 (2006.01) E21B 7/00 (2006.01) E21B 25/00 (2006.01) E21B 33/068 (2006.01) E21B 33/138 (2006.01)

Patent

CA 1165756

Abstract of the Disclosure An arrangement for full hole drilling, wherein a drilling bit having a passage for drilling fluid is attached to a drill pipe string. A hole wall former is provided above the bit for closing the space between the hole walls and the drill pipe string. A container containing a plug- ging material is provided in the interior of the drill pipe string immediately above the bit, which is adapted to let drilling fluid between the walls of said container and said drill pipe string. The bit has an axial bore of a diameter which is greater than the inside diameter of the container and which is adapted to receive the lower end of said container.

385639

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