Method for drilling with casing

Boring or penetrating the earth – Processes – Boring curved or redirected bores

Reexamination Certificate

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Details

C175S171000, C166S380000, C166S381000

Reexamination Certificate

active

07044241

ABSTRACT:
A method for drilling boreholes using casing (16) as the drill string and for advancing a casing string toward the bottom of the borehole is described. In the method, the drilling assembly (26) is used as a guide over which the drill string (16) is advanced toward the bottom of the borehole prior to removing the drilling assembly from the wellbore.

REFERENCES:
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patent: 4544041 (1985-10-01), Rinaldi
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patent: 5168942 (1992-12-01), Wydrinski
patent: 5271472 (1993-12-01), Leturno
patent: 5339909 (1994-08-01), Jenne et al.
patent: 5456326 (1995-10-01), Raines
patent: 5590726 (1997-01-01), Jarvela et al.
patent: 5921332 (1999-07-01), Spedale, Jr.
patent: 5950742 (1999-09-01), Caraway
patent: WO 00/50730 (2000-08-01), None

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