E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/28
E21B 17/10 (2006.01) E21B 17/07 (2006.01) F16D 3/76 (2006.01) F16F 1/52 (2006.01)
Patent
CA 1101832
ABSTRACT OF THE DISCLOSURE The present invention relates to a shock absorbing apparatus for connection in a drilling string and capable of transmitting the axial drilling work loads and the torsional forces required for rotating a drill bit at the bottom of the drill string. The apparatus includes an elongated housing and a mandrel extending longitudinally within the housing. The housing interior and the mandrel have mutually co-operating formations thereon for transmitting the axial and torsional forces. The mutually co-operating formations have substantial clearance spaces therebetween such that the mandrel has a substantial degree of axial and torsional freedom relative to said housing. A matrix of resiliently deformable material is disposed in the clearance spaces between the mutually co- operating formations so that under the influence of shock loadings on the drill string, the matrix of material deforms and flows to take up and reduce the shocks and vibrations transmitted between the mandrel and the housing.
336232
Delta Oil Tools Ltd.
Gowling Lafleur Henderson Llp
LandOfFree
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