Back end connection in a downhole drill

Details Back end connection in a downhole drill Back end connection in a downhole drill

1998-05-29

1999-11-30

Vo, Peter

Tool driving or impacting

Impacting devices

Selective axial direction of impact

173 17, 173 73, 173 80, E21B 414

Patent

active

059925370

ABSTRACT:
A pneumatic downhole impact drill has a backhead for mounting an inlet check valve and a mounting hub for mounting a fluid delivery tube. A split ring has an interior circumferential groove forming upper and lower shoulders and comprises two substantially identical semi-circular ring segments. The ring segments are positioned around flanges on the backhead and the mounting hub such that the upper shoulder of the split ring slidably engages the upper surface of the backhead flange and the lower shoulder slidably engages the lower surface of the mounting hub flange to mount the backhead to the mounting hub. A first gap is formed between the outside surface of the split ring and the inside surface of the casing. A second gap is formed between the inside surface of the groove and the outside surfaces of the mounting hub and backhead flanges. Taken together, the gaps allow lateral relative movement between the mounting hub and backhead flanges.

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