Abstract: An improved wireline operated oil well dump bailer includes an elongated tool body having a longitudinal bore that extends through the tool body, the bore including a chamber section for carrying cement. A port through the tool body provides fluid communication between the tool bore and the oil well bore. A piston is slidably movable within the tool body between a first position in which the piston seals the port and a second position in which the piston is spaced from the port so that well bore fluid pressure can enter the tool body through the port and communicate with the piston. A trigger carried by the tool body, preferably in the form of an explosive charge which can be activated using the wireline moves the piston away from the first position to the second position so that the well fluid pressure enters the bore and powers the piston to dispense cement from the cement carrying chamber section.

Abstract: An oil well downhole safety valve is operated using annulus pressure. The device includes a tool body having a continuous wall defining a flow bore for conveying liquid, the tool body being adapted to travel through a well annulus as part of a work string. A valve body is slidably mounted within the tool body bore. Annular seals carried on the external surface of the valve body form a seal between the valve body and the continuous wall of the tool body. At least one opening is provided through the tool body for allowing annulus pressure to communicate with the flow bore. A valving member is carried by the valve body and is movable between open flow and closed flow positions for valving the flow of fluid through the flow bore. Piston drives, operated by annulus pressure, move the valving member between open flow and closed flow positions. The apparatus can include a spring carried by the tool body for biasing the valving member to an open flow position.