Abstract: A gas-lift petroleum well and method for producing petroleum products using downhole pressurized gas to provide lift. The gas-lift well having a well casing, a production tubing, a packer, and a gas-lift valve. The well casing extends within a wellbore of the well, and the wellbore extends through oil and gas zones. The production tubing extends within the casing. The tubing having an opening formed therein, which is in fluid communication with an oil zone. The packer is located downhole in the casing and coupled to the tubing. The packer can have an electrically controllable packer valve, which is adapted to control a flow of downhole pressurized gas from one side of the packer to another. The downhole pressurized gas is provided by a gas zone that the wellbore passes through. The downhole gas-lift valve is coupled to the tubing and is adapted to control a flow of downhole pressurized gas into oil in the tubing for lifting the oil. The gas-lift valve can be an electrically controllable valve.

Abstract: A gas-lift petroleum well (38, 98, 150) and method for producing petroleum products using downhole pressurized gas to provide lift. The gas-lift well (38, 98, 150) comprises a well casing (22), a production tubing (24), a packer (40), and a gas-lift valve (148). The well casing (22) extends within a wellbore of the well (38), and the wellbore extends through oil and gas zones. The production tubing (24) extends within the casing (22). The tubing (24) comprises an opening formed therein, which is in fluid communication with an oil zone. The packer (40) is located downhole in the casing (22) and coupled to the tubing (24). The packer (40) can comprise an electrically controllable packer valve (44), which is adapted to control a flow of downhole pressurized gas from one side of the packer to another. The downhole pressurized gas is provided by a gas zone that the wellbore passes through.

Abstract: A method and apparatus for identifying the fluid in a vessel, such as, a storage tank or pipeline using ultrasonic techniques. The method uses a transducer to project ultrasonic energy through the vessel and a second transducer positioned opposite the first to receive the energy that has been transmitted through the vessel and fluid. The transducers are included in a circuit whose parameters are adjusted to cause the circuit to resonate with the magnitude of the adjusted parameter being related to the fluid in the vessel.