Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Patent
1987-05-19
1989-04-04
Dang, Hoang C.
Boring or penetrating the earth
Automatic control
In response to drilling fluid circulation
175232, 175317, 175324, E21B 2110
Patent
active
048177393
ABSTRACT:
A drilling fluid pulse generator for use above a drill bit to produce pulsations in drilling fluid flow. An autocycling valve briefly interrupts the flow of fluid to bit jets to reduce the effective hydrostatic pressure at the drilling face and to hydraulic energy in the drill string to thoroughly scour the hole face when the briefly closed valve reopens. An alternate configuration provides a bypass route for fluid diverted from the bit, and the bypass includes jet nozzles to add energy to the return fluid stream to further reduce the effective hydrostatic pressure at the drilling face.
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patent: 4583603 (1986-04-01), Dorleans et al.
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Dang Hoang C.
Jeter John D.
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