Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 24 - Class VI Injection Wells and Facilities Underground Injection Control Program › Section 24-2 - Definitions

Current through July 13, 2024
The following definitions supplement the definitions
				  contained in Section §
									
										35-11-103
				  of the Wyoming Environmental Quality Act.
(a) "Abandoned well" means a well whose use
				has been permanently discontinued or that is in a state of disrepair such that
				it cannot be used for its intended purpose or for observation purposes.
				Temporary or intermittent cessation of injection operations is not
				abandonment.
(b) "Aquifer" means a
				zone, stratum, or group of strata that can store and transmit water in
				sufficient quantities for a specific use.
(c) "Area of review" means the subsurface
				three-dimensional extent of the carbon dioxide plume, associated pressure
				front, and displaced fluids, as well as the overlying formations, and surface
				area above that delineated region.
(d) "Background" means the constituents or
				parameters and the concentrations or measurements that describe water quality
				and water quality variability prior to the underground injection.
(e) "Bore/casing annulus" means the space
				between the wellbore and the well casing.
(f) "Carbon dioxide plume" means the
				underground extent, in three dimensions, of an injected carbon dioxide
				stream.
(g) "Carbon dioxide stream"
				means carbon dioxide, plus associated substances derived from the source
				materials and any processing, and any substances added to the stream to enable
				or improve the injection process. Within this Chapter, the term "carbon dioxide
				stream" does not include any carbon dioxide stream that meets the definition of
				a hazardous waste under
				40 C.F.R. §
										261.3.
(h) "Casing" means a pipe or tubing of
				appropriate material, of varying diameter and weight, lowered into a borehole
				during or after drilling to support the sides of the hole to prevent the walls
				from caving, to prevent loss of drilling mud into porous ground, or to prevent
				water, gas, or other fluid from entering or leaving the hole.
(i) "Casing/tubing annulus" means the space
				between the well casing and the tubing.
(j) "Cementing" means sealing the annular
				space around the outside of a casing string using a specially formulated
				mixture to hold the casing in place and prevent any movement of fluid in this
				annular space. Cementing also includes operations to seal the well at the time
				of abandonment.
(k) "Class I well"
				means a well used to inject hazardous or non-hazardous industrial, commercial,
				or municipal waste beneath the lowermost formation containing, within
				one-quarter (1/4) mile of the well bore, an underground source of drinking
				water.
(l) "Class II well" means
				any commercial or non-commercial well used to dispose of water or fluids
				directly associated with the production of oil or gas, any well used to inject
				fluids or gas for enhanced oil recovery, or any well used for the storage of
				liquid hydrocarbons.
(m) "Class V
				facility" means any property that contains an injection well, dry well, or
				subsurface fluid distribution system that is not defined as a Class I, II, III,
				IV, or VI well in these Regulations. A Class V facility includes all systems of
				collection, treatment, and control that are associated with the underground
				injection.
(n) "Class VI well"
				means a well that is used for injecting a carbon dioxide stream for geologic
				sequestration that:
(i) Is not experimental in
				nature and injects a carbon dioxide stream for geologic sequestration, beneath
				the lowermost formation containing an underground source of drinking
				water;
(ii) Has been granted a
				waiver of the injection depth requirements pursuant to requirements of Section
				15 of this Chapter; or
(iii) Has received an expansion to the areal
				extent of an existing Class II enhanced oil recovery or enhanced gas recovery
				aquifer exemption pursuant to Section
				16 of this Chapter.