Illinois Administrative Code
Title 62 - MINING
Part 240 - THE ILLINOIS OIL AND GAS ACT
Subpart D - SPACING OF WELLS
Section 240.455 - Horizontal Drilling
Current through Register Vol. 48, No. 12, March 22, 2024
a) For purposes of this Subpart, a horizontal well is a wellbore that has an overall length within the reservoir of twice the thickness of the reservoir.
b) An oil or gas production well may be developed with one or more horizontal drainholes drilled from a single vertical wellbore and may be considered a single well and permitted in accordance with the provisions of Subpart B.
c) If the proposed horizontal well will be part of an enhanced oil recovery project, the spacing requirements for all portions of the horizontal drainholes shall comply with Section 240.430(b).
d) For a horizontal well:
e) For the horizontal wells described in subsection (d), all portions of the horizontal drainhole:
f) If a horizontal drilling unit configuration other than that allowed in subsection (d)is necessary because of geology or reservoir conditions, a modified or special drilling unit is required in compliance with Section 240.460 and/or Section 240.465.