Abstract: A detector structure is used to sense and log the joints in a downhole jointed tubular structure, such as a well bore casing or production tubing, in a subterranean well. The detector is moved through the jointed tubular structure on an elongated positioning member, representatively a slick line, through a series of joints to be logged. As the detector passes through each joint it electromagnetically senses the joint and responsively generates an electric output signal. The output signal is used to momentarily cause a drag structure portion of the detector, in cooperation with the interior side surface of the tubular structure, to momentarily create a detectable tension change in the elongated positioning member. Alternatively, a pyrotechnic or compressed gas device may be used to create the detectable changes in response to the generation of the electrical output signals.

Abstract: A specially designed electronic component is surface mounted on a printed circuit board substrate member having a spaced series of electrically conductive circuitry connection portions disposed on a side surface thereof. The electronic component has a body portion with a spaced series of elongated metal lead members fixedly secured thereto and projecting outwardly therefrom. Longitudinal portions of the lead members are soldered to the circuitry connection portions. Side surface areas of these longitudinal portions are clad with a second metal material having a coefficient of thermal expansion substantially different than that of the underlying longitudinal lead member portions. During fabrication of the circuit board a solder paste material is deposited on the circuitry connection portions and the lead member longitudinal portions are placed in a closely adjacent, aligned relationship with the circuitry connection portions.

Abstract: In a gas turbine engine compressor power unit fuel is supplied at an essentially constant pressure to a fuel nozzle for injection into the combustion liner of the power unit's combustor. Nozzle fuel flow is modulated solely by bleeding off combustor supply air to vary the internal liner pressure, thereby altering the fuel pressure drop across the nozzle.