Drilling shock sub

Details Drilling shock sub Drilling shock sub

E - Fixed Constructions

21

B

255/28

E21B 17/00 (2006.01) E21B 3/00 (2006.01) E21B 41/00 (2006.01)

Patent

CA 1068253

ABSTRACT OF THE DISCLOSURE A drill string protecting axial shock absorbing sub which is relatively short and rugged and comprises inner and outer telescopically intersplined tubular elements forming therebetween an annular shock abgorbing cushion confining piston chamber which is filled with a tightly packed suspension of 3/8" polyurethane pellets in a highly heat resistant lubricant such as "Mobil #1 Synthesized Engine Lubricant".

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