Patent ID: 6575235
Filing Date: 2003-06-10
Classification: E21B

Abstract:
A substantially horizontal subterranean drainage pattern for accessing an area of a subterranean zone from the surface, comprising:a substantially horizontal diagonal well bore extending from a surface well bore defining a first end of the area in the subterranean zone to a distant end of the area; a first set of substantially horizontal lateral well bores extending in a spaced apart relation to each other from the diagonal well bore to a periphery of the area on a first side of the diagonal well bore; a second set of substantially horizontal lateral well bores extending in a spaced apart relation to each other from the diagonal well bore to a periphery of the area on a second side of the diagonal well bore opposite the first side; and wherein a first lateral of the first set and a first lateral of the second set each include a short reversal of radius proximate to the substantially horizontal diagonal well bore.