Patent ID: 9551209
Date: 2017-01-24
CPC Classifications: B65G,E21B,E21F,G01V

Claim:
1. A system for accessing one or more subterranean zones, the system comprising: a drilling pad at a land surface; a first well, located on the drilling pad, comprising a substantially vertical wellbore coupled to a first junction proximate a subterranean zone, a first horizontal drainage wellbore extending from the first junction with a horizontal portion that extends at least 2,440 feet; a second well, located on the drilling pad, comprising a substantially vertical wellbore coupled to a second junction proximate the subterranean zone, a second horizontal drainage wellbore extending from the second junction with a horizontal portion that extends at least 2,440 feet; wherein the wells are offset from each other by 2-100 feet at the surface; wherein the first well horizontally extends into the subterranean zone in a first direction; wherein the second well horizontally extends into the subterranean zone in a second direction; wherein a drilling pad surface area is smaller than an area containing the first and second horizontal drainage wellbores; wherein the subterranean zone is a low porosity zone; and wherein both the first and second wells are cased at least in the substantially vertical wellbores and are configured to produce fluids to the surface.