Slot cavity

Details Slot cavity Slot cavity

2007-09-04

2007-09-04

Thompson, Kenneth (Department: 3672)

Wells

Processes

Specific pattern of plural wells

C166S050000, C166S052000, C175S062000, C405S055000

Reexamination Certificate

active

10419529

ABSTRACT:
A method for accessing a subterranean zone from the surface includes drilling a substantially vertical well bore from the surface to the subterranean zone and forming a slot cavity in the substantially vertical well bore proximate to the subterranean zone. The slot cavity comprises a substantially non-cylindrical shape. The method also includes drilling an articulated well bore from the surface to the subterranean zone. The articulated well bore is horizontally offset from the substantially vertical well bore at the surface and intersects the substantially vertical well bore at a junction proximate to the subterranean zone. The method may include drilling the articulated well bore to intersect the slot cavity of the substantially vertical well bore and drilling a substantially horizontal drainage pattern from the slot cavity into the subterranean zone. The subterranean zone may comprise a coal seam.

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