Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1984-04-10
1985-11-12
Novosad, Stephen J.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
267125, 464 20, E21B 1707
Patent
active
045522308
ABSTRACT:
A telescopic shock absorber for use in a drill string includes a resilient arrangement to cushion telescopic contraction and extension of the shock absorber in response to shock loads and vibrations imparted during drilling. The shock absorber operates independently of the drilling fluid pressure conducted through the structure during drilling operations. A dampening system assists in cushioning the shock loads and vibrations and the dampening system and resilient arrangement are deactivated when jarring impacts are delivered to the well string by a drilling jar carried therein. The resilient arrangement provides a combination mechanical and hydraulic system for cushioning the impact loads and vibrations encountered.
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"OSG-3 Oil Packed Pressure Balanced Bumper Sub", Dec. 27, 1966.
Anderson Edwin A.
Webb Derrel D.
Dang Hoang C.
Hayden Jack W.
Novosad Stephen J.
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