Assembly for drilling low pressure formation

Details Assembly for drilling low pressure formation Assembly for drilling low pressure formation

2006-08-15

2006-08-15

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

With fluid conduit lining or element

C175S057000, C175S324000

Reexamination Certificate

active

07090039

ABSTRACT:
The invention relates to a drilling assembly for drilling a borehole into geological formations which assembly comprises:a drilling shaft placable in the borehole, which shaft has a drilling head; anda pump device placable in the borehole, wherein the pump device has sealing meansfor sealing a first borehole part below the sealing means from a second borehole part above the sealing means, and wherein the pump device is enabled to pump a fluid from the first borehole part to the second borehole part.

REFERENCES:
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patent: 4137975 (1979-02-01), Pennock
patent: 4630691 (1986-12-01), Hooper
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patent: 4898244 (1990-02-01), Schneider et al.
patent: 6209663 (2001-04-01), Hosie
patent: 6877571 (2005-04-01), Hughes et al.
patent: 6957698 (2005-10-01), Krueger et al.
patent: 2002/0170749 (2002-11-01), Hoyer et al.
patent: 02/14649 (2002-02-01), None

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