Impact drilling tool

Details Impact drilling tool Impact drilling tool

1976-07-19

1977-08-30

Purser, Ernest R.

Tool driving or impacting

Work cleansing

By motive fluid for drive motor or advance causing or...

91 50, 175 92, E21B 106

Patent

active

040448444

ABSTRACT:
A fluid operated impact drilling tool has a hammer slidably mounted in a casing connected to a string of drilling pipe. Inside the casing above the hammer is mounted a valve. Both the valve and hammer have reciprocal sliding movement along the longitudinal axis of the tool to substantially interrupt flow of a drilling fluid therethrough. Movement of the valve and hammer predominantly results from different pressures acting on separate pressure areas of the valve and hammer. The hammer may impact either an anvil or a bit attached thereto. Wear on the valve and hammer is reduced by smooth, hardened surfaces at locations subject to wear. A trapped fluid may also be used in an alternative embodiment to dampen the shock effect of the valve as it reaches its upper and lower stops.

REFERENCES:
patent: 1892517 (1932-12-01), Pennington
patent: 2620162 (1952-12-01), Pennington
patent: 2943603 (1960-07-01), Bassinger
patent: 3162251 (1964-12-01), Bassinger
patent: 3768576 (1973-10-01), Martini

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