Abstract: A method for testing physical integrity of production tubing and production casing in a gas-lift well includes the steps of opening communication from a pressure source to an interior space of the production tubing; disposing a sealing tool in the production tubing to obtain a seal at a desired location of the production tubing; opening communication from an inner annular space of the well; applying a predetermined test pressure to the interior space of the production tubing; monitoring the test pressure applied for a pressure drop; and monitoring flow from the inner annular space. The physical integrity of the production casing is then tested by opening communication from a pressure source to the inner annular space; closing communication from the interior space of the production tubing; applying a predetermined test pressure to the inner annular space; and monitoring the test pressure for a pressure drop.

Abstract: A system for severing anchor cable mooring lines and oil well drill pipes is disclosed in which a primary hydraulic system containing a first fluid under pressure is utilized to actuate cutters and a secondary hydraulic system containing a second fluid under pressure is used to control valves which regulate the application of the first fluid to the cutters. The system is designed to operate independently of local power sources during an emergency.

Abstract: An electronic interface controller is disclosed. The controller is particularly suited for use in controlling dehydration processes of light, heavy and extra heavy crude oils on the basis of the interface between the oil and water. The controller includes sensor elements which generate a signal representative of current flow between the sensors to indicate the conductivity of liquids between the sensors. A first device, responsive to a current flow signal from the sensors, generates a control signal according to the conductivity of liquid in contact with the sensors. A timer is provided for delaying a control signal generated by the first device for a delay period between 0 and 180 seconds.

Abstract: The present invention relates to an improved system and method for recovering oil. The system includes a subsoil pump for pumping oil to the surface having an opening in its casing through which an assisting, treatment, or maintenance fluid may be added in a desired quantity. The opening is located substantially at the level of the pump's oil inlet and communicates with a supply of fluid via a passageway having a check valve for admitting only precise quantities of fluid to the opening.

Abstract: A collapsible inner form for making tubular concrete products has upper and lower sections with rigid casting faces, and flexible side sections which buckle inwardly when the internal form is collapsed. Jacks are used to push wheels in the upper and lower sections outwardly against the cast product, forcing the sections to their collapsed positions. The inner form is movable on the wheels for removal of the inner form from the solidified cast product.