Underbalance jet pump drilling method

Details Underbalance jet pump drilling method Underbalance jet pump drilling method

1992-10-30

1994-10-18

Dang, Hoang C.

Boring or penetrating the earth

Processes

Boring with specific fluid

175339, 175393, E21B 1060

Patent

active

053559673

ABSTRACT:
A method for rotary drilling and removing cuttings provides a underbalanced drilling fluid pressure at the drilling face but overbalanced pressure in the wellbore. The preferred method uses a rotary drill within a housing which also encloses a jet pump which draws and pressurizes the cuttings and drilling fluid, a separator of the cuttings and a portion of the pressurized drilling fluid, and a nozzles to supply separated and reduced pressure drilling fluid back to drilling face while the cuttings and remaining pressurized drilling fluid flows up towards the surface. The method avoids overpressure strengthening of the drill face and underpressure damage to the wellbore.

REFERENCES:
patent: 2849214 (1958-08-01), Hall
patent: 3455402 (1969-07-01), Tiraspolsky
patent: 4083417 (1978-04-01), Arnold
patent: 4475603 (1984-10-01), Hayatdavoudi
patent: 4605069 (1986-08-01), McClaflin et al.
patent: 4624327 (1986-11-01), Reichman
patent: 4765416 (1988-08-01), Bjerking et al.
patent: 4809791 (1989-03-01), Hayatdavoudi

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