Rotary drill indexing system

Details Rotary drill indexing system Rotary drill indexing system

1982-04-23

1984-07-24

Pate, III, William F.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 65, 175 62, 175 73, E21B 704

Patent

active

044613598

ABSTRACT:
Rotary process and apparatus for drilling a borehole through a subterranean formation in which the path of a rotary drill bit is varied by deflecting the drill string in response to the pulsating flow of drilling fluid through the drill string. The pulsating drilling-fluid flow is synchronized with the rotation of the drill string by generating a function representative of the rotational position of the drill string and, in response to this function, diverting a portion of the drilling fluid through a secondary line. Flow through the secondary line is controlled by a valve which is opened and closed in synchronization with the rotational position of the drill string. The diverted fluid is supplied to the drilling fluid source for recirculation.

REFERENCES:
patent: 3554302 (1971-01-01), Adkins
patent: 3595326 (1971-07-01), Claycomb
"Rotary Drilling Holes in Coal Beds for Degasification," Bureau of Mines Report of Investigation 8097, U.S. Department of the Interior, 1975, Joseph Cervik et al.

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