Hydraulic shock absorbing method

Details Hydraulic shock absorbing method Hydraulic shock absorbing method

1977-12-14

1979-10-16

Purser, Ernest R.

Boring or penetrating the earth

Processes

Boring with specific fluid

175321, 267125, E21C 706

Patent

active

041710258

ABSTRACT:
A hydraulic shock absorbing method for protecting the drill bit and drill pipe in rotary earth drilling comprising the steps of slidably moving an anvil connected to a drilling bit in a casing in response to increased down weight on the drill bit and sequentially transmitting further increases in the down weight and shocks from the anvil to a plurality of independently operating hydraulic pistons slidably mounted within the casing when down weight on the drill bit exceeds increasing predetermined amounts to activate the pistons in sequence. The drilling fluid within the casing is transmitted to first pressure areas on the anvil and the plurality of pistons and the drilling fluid is passed through the drilling bit to provide a pressure drop and then communicated to second pressure areas on the plurality of pistons.

REFERENCES:
patent: 1785559 (1930-12-01), Ponti
patent: 2661928 (1953-12-01), Topanelian, Jr.
patent: 2712435 (1955-07-01), Allen
patent: 2851251 (1958-09-01), Mori
patent: 2901221 (1959-08-01), Whittle
patent: 2946314 (1960-07-01), Nast
patent: 2987007 (1960-05-01), Whittle
patent: 3834472 (1974-09-01), Perkins
patent: 4055338 (1977-10-01), Dyer

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