Abstract: Changes in the internal diameter of a fluid handling pipes are measured by measuring the vibrational characteristics by a non-invasive, passive acoustic technique. Deviations from the normal vibrational characteristics are sensed and used to determine changes of increase or decrease in the pipe's internal diameter.

Abstract: The present invention determines the presence of a pig in a pipeline and the condition of the pig, as regards to the material the pig may be pushing, by passive acoustic detectors which determine the acoustic characteristics for the pipe and the pig. From these a computer is used to determine from changes in these characteristics the nature of the materials picked up by the pig or the condition of the pig and the pipe.

Abstract: A multi-phase fluid flow meter based on passive and non-intrusive acoustics is described for use in field applications on pipes. The present design uses the pipe's characteristic acoustic frequency and its amplitude variation in conjunction with a differential pressure measurement to obtain the total mass flow rates and mass flow rates of each phase. In addition to the mass flow rates the void/liquid fraction, fluid velocities and densities become viable estimates. Instrument construction is simple and very robust, allowing for use in extreme environments. This includes down hole as well as surface measurements.

Abstract: A method and apparatus for detecting the flow regime of multiphase fluid flowing in a closed pipeline system utilizes an entirely passive acoustical detector means. The acoustical pattern detected by the detector means is amplified and compared to known patterns to identify the flow regime according to its acoustical fingerprint.

Abstract: The present invention is a formation compensated fluid density meter which includes a well logging sonde that is inserted into a borehole traversing an earthen formation. The sonde includes within it a source which emits gamma rays into the borehole fluid and formation partially collimated and detector assemblies which detect returning gamma rays and provide count signals corresponding to a count of the detected gamma rays. A cable connected to the detector assembly conveys the count signals to the surface where surface electronics includes apparatus which processes the count signals to provide a signal corresponding to the density of the fluid in the borehole.