Percussion drilling assembly having erosion retarding casing

Details Percussion drilling assembly having erosion retarding casing Percussion drilling assembly having erosion retarding casing

2008-08-19

2011-11-22

Thompson, Kenneth L (Department: 3676)

Boring or penetrating the earth

With tool shaft detail

C175S296000

Reexamination Certificate

active

08061450

ABSTRACT:
A percussion drilling assembly for drilling through earthen formations and forming a borehole. In some embodiments, the drilling assembly includes a retainer sleeve having an upper end with an outer diameter and a tubular casing engaging the retainer sleeve. The tubular casing includes a first, second, and third tubular portion. The first tubular portion engages the upper end of the retainer sleeve at a first end having an outer diameter substantially equal to the outer diameter of the retainer sleeve. The second tubular portion is connected to the first tubular portion at a first end and has a second end with an outer diameter that differs from the outer diameter of the retainer sleeve. The third tubular portion is coupled to the second tubular portion. The first and third tubular portions each have a length configured to enable gripping of the tubular casing using tongs.

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Dictionary definitions of “Hole” “Dimple” and “Pit” from thefreedictionary.com, accessed Dec. 17, 2010.

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