Abstract: The present disclosure describes systems and methods for flow-activated plug assembly flow seat initiation, which in some aspects may comprise sealing a plug within a downhole bore, and may include a plug assembly comprising a frustoconical tube; a tubular mandrel positioned longitudinally through the frustoconical tube and having port(s) fluidly connecting a mandrel bore with the bore of the frustoconical tube, and having a shear ring extending from the mandrel; and a ball configured to fluidly seal the proximal end of the tubular mandrel; wherein the tubular mandrel is configured to move between a first position having a fluid passageway through the ports and a second position wherein the shear ring has been sheared away when a predetermined fluid pressure is applied to the plug assembly and the tubular mandrel is positioned relative to the frustoconical tube such that the port(s) are blocked, closing the fluid passageway.

Abstract: A downhole tool comprising magnesium is placed in a well bore in a subterranean formation for performance of a downhole operation. After performance of the downhole operation, rather than mechanically retrieving or removing the tool, at least a portion of the magnesium in the downhole tool is dissolved by contacting the downhole tool with an aqueous ammonium chloride solution.

Abstract: A downhole tool comprising magnesium is placed in a well bore in a subterranean formation for performance of a downhole operation. After performance of the downhole operation, rather than mechanically retrieving or removing the tool, at least a portion of the magnesium in the downhole tool is dissolved by contacting the downhole tool with an aqueous ammonium chloride solution.