Annulus bypass peripheral nozzle jet pump pressure differential drilling tool and method for well drilling
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United States of America Patent
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-
Dec 23, 1986
Issued Date -
N/A
app pub date -
Dec 26, 1984
filing date -
May 19, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pressure differential drilling tool and method of underbalanced pressure controlled well bore drilling, characterized by a modulating plug closely expanded to the well bore diameter to form an annulus for external bypass of well fluid immediately above the drill bit and through which the drill string continuously makes hole, and by an upwardly disposed peripheral nozzle jet pump with controlled suction of fluid from the bit so as to establish a reduced and/or underbalanced fluid pressure condition at the bit-to-bore bottom interface for operating the drill bit at an increased rate of penetration while maintaining a higher pressure condition in the well bore annulus above the modulating plug controllably expanded by hydraulic pressure applied to operate the jet pump.
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