Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1975-01-27
1976-03-30
Leppink, James A.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
173 78, E21B 106
Patent
active
039468194
ABSTRACT:
A tool adapted for connection to the lower end of a fluid supply line comprising: a housing; a tubular stem telescopically received by the housing for relative reciprocal movement therewith in response to fluid pressure communicated to the housing through the supply line; a working element attached to one end of the stem for movement therewith; and a valve assembly carried by the housing and responsive to predetermined movement of the stem relative to the housing to relieve fluid pressure within the tool, permitting a return of the stem and housing to their initial position relative to each other. In the method, the tool is attached to the end of a fluid supply line and inserted into a well conduit, the continuous supply line is inserted into the conduit until the tool reaches a preselected level; the tool is operated by applying fluid pressure thereto through the supply line; and the supply line is further fed into the conduit as the tool advances through the conduit. When the working element engages a firm obstruction, the housing and tubing are repeatedly reciprocated relative to the stationary bit imparting hammering blows thereto. When the working element is substantially free to move, it reciprocates relative to the stationary housing.
REFERENCES:
patent: 2813516 (1957-11-01), Dulaney
patent: 3116781 (1964-01-01), Rugeley et al.
patent: 3361220 (1968-01-01), Brown
patent: 3702223 (1972-11-01), Bednar
patent: 3791447 (1974-02-01), Smith et al.
Brown Equipment & Service Tools, Inc.
Leppink James A.
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