Abstract: A jarring apparatus for use with an electric line for upward jarring of a tool element stuck in an oil well including a tubular member having a tool element attached to its lower end. A hammer disposed in the tubular member is attached to a cylindrical rod for motion therewith by an electric line disposed through a longitudinal bore in the rod and is moved from a first configuration upwards to a second configuration by a quick, generally upward motion of the electric line toward an opposed anvil included with the tubular member, the quick generally upward motion of the cylindrical rod from its first configuration to its second configuration rapidly moving the hammer to strike against the anvil to provide a generally upward jarring action which is transmitted to jar the element in a generally upward direction. If the jarring does not loosen the stuck tool, disconnect means are provided for leaving the tubular member and tool element in the well but retrieving the electric line.

Abstract: A granulated blasting agent composition comprising ammonium nitrate, a nitroalkane having of from 2 to 3 carbon atoms and mixtures thereof, a density improver selected from the group consisting of wheat flour and bentonite and polyoxyethylene ether as a thickening agent for the nitroalkane in an amount sufficient to prevent migration of the nitroalkane from the ammonium nitrate.

Abstract: A blasting agent comprising ammonium nitrate, fuel, a nitroalkane and bentonite as a thickening agent.