Heat shield for a drill string shock absorbing apparatus

Details Heat shield for a drill string shock absorbing apparatus Heat shield for a drill string shock absorbing apparatus

1978-03-16

1979-03-20

Reger, Duane A.

Spring devices

Fluid

Expansible-contractible chamber device

175321, 188264G, E21B 1702

Patent

active

041450345

ABSTRACT:
A shock absorbing apparatus for earth boring drilling is disclosed herein. The shock absorber is of the type having telescoping members with a sealed chamber containing pressurized fluid between the members for supporting load and absorbing shock. The members have axial passages for the passage of high pressure air to the bottom of a borehole to remove cuttings. A tube is connected to one of the members and inserted in telescoping relationship into the axial passage of the other member to transmit the circulating air. The seals of the tube are protected from the heat of the circulating air by a liner disposed concentrically in the tube. The liner is cylindrical and of lesser diameter than the inner diameter of the tube to create an annular air space for thermal insulation.

REFERENCES:
patent: 2964137 (1960-12-01), Luedtke et al.
patent: 3349858 (1967-10-01), Chenoweth
patent: 3350900 (1967-11-01), Harrison
patent: 4055338 (1977-10-01), Dyer

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