Plugging and abandonment

Notice of intention to abandon any geothermal energy extraction facility must be filed with the state geologist by the producer prior to the commencement of plugging operations, on a form prescribed by the state geologist. The notice must state the name and location of the well or well field and the name of the producer. Before any geothermal energy extraction facility is abandoned, it must be plugged in a manner which will confine permanently all subsurface minerals, oil, gas, and water in the separate strata originally containing them. This operation must be accomplished by the use of mud-laden fluid, cement, and plugs, used singly or in combination as may be approved by the state geologist. Casing must be cut off three feet [.91 meters] below the surface of the ground. The top plug in any hole must be set at least three feet [.91 meters] below ground level, and the land surface must be restored as nearly as possible to its original condition. Shallow closed-loop systems using an approved heat transfer fluid may, upon approval of the state geologist, be abandoned by permanently sealing all of the loop ends and burying all pipes at least three feet [.91 meters] below ground. Closed-loop systems must be completely purged of heat transfer fluid prior to plugging. This fluid must be disposed of in accordance with the provisions of North Dakota Century Code chapter 61-28 and other state laws and regulations.