Abstract:One objective of well abandonment is to help prevent pollution to the environment from residual fluids left in the well post caprock restoration. These fluids may have been present in the annuli when well construction was commenced. They are normally removed when the casing(s) is retrieved from the well and capped with an environmental cement plug, or more recently, via perforating the casing(s) and circulating out the annuli contents prior to setting the environmental cement plug.
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