Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2007-07-17
2007-07-17
Neuder, William (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S070000, C166S050000, C166S117500, C166S313000
Reexamination Certificate
active
11190166
ABSTRACT:
A process for underbalanced drilling into multiple coal and shale formations, and dewatering the drilled formations, which includes drilling a first borehole through several coal seams to a certain depth; lowering an upstock on the end of a carrier string to the depth of the upper coal seam; lowering a drill string in the carrier string, and angling off of the upstock, to drill a lateral or horizontal borehole within the coal seam; repeating the process for the second coal seam; setting a packer in place above the first coal seam in the annulus between the cased borehole and the carrier string; forming perforations in the wall of the carrier string below the packer; retrieving the upstock from the carrier string; lowering an electrical submersible pump to the bottom of the principal borehole; pumping water from the sump portion to the surface within the annulus of the second drill string.
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patent: 5720356 (1998-02-01), Gardes
patent: 6065550 (2000-05-01), Gardes
patent: 6357523 (2002-03-01), Zupanick
patent: 6425448 (2002-07-01), Zupanick et al.
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patent: 2004/0060737 (2004-04-01), deBoer
Garvey, Smith Nehrbass & North, L.L.C.
Neuder William
Smith Gregory C.
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