E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/28
E21B 17/00 (2006.01) E21B 17/04 (2006.01) F16D 3/06 (2006.01)
Patent
CA 1037464
"DRILLING STRING SHOCK-ABSORBING TOOL" ABSTRACT OF THE DISCLOSURE A shock absorbing tool is provided having a low spring rate deformable element disposed in an oil bath in a sealed, annular chamber formed between the barrel and mandrel. The deformable element comprises an annular stack of alternating rigid washers and deformable rings. The washers are operative to prevent the deformable rings from bridging the walls of the mandrel and barrel, which bridging would transmit shock load between them. Thus the stack of rings function as a long unit to absorb the axial movement of the mandrel originating from the action of the bit on bottom. One of the chamber seals is a floating seal, exposed to the drilling fluid outside the tool so that the pressure within the chamber is equalized with the hydrostatic bottom hole pressure. As a result, the tool is not pre-loaded, when lowered to the bottom of the well bore, leaving the most effective shock-absorbing capability of the element available to absorb the axial thrusts of the drilling bit.
277085
Anderson Clifford
Mason Leonard
LandOfFree
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