Schlumberger Technology Corporation

Donald Charles McKeon

Oliver Clinton Mullins

Xu Wu

Felix K Chen

Jaideva C Goswami

Elizabeth B Dussan V

Richard W Oldigs

Richard P Harris

Henning Groenzin

Clelia Canuel

Apparatus and methods for measuring oil flow velocity in a well are provided which utilize fluorescence quenching. A marker which quenches the natural fluorescence of crude oil is chosen and injected into the oil flow at a first location. At a second location, the oil flow is subjected to light at a wavelength which will cause oil to naturally fluoresce. The fluorescence signal is detected at the second location by a sensing probe. The time that it takes for the quenching marker to move from the first location to the second location is measured by sensing a decrease in fluorescence due to the quencher. Fluid velocity is determined by dividing the distance between the marker-ejection point and the optical probe position by the time it took the marker to move that distance.

Apparatus and methods for determining velocity of oil in a flow stream

A magnet assembly for nuclear magnetic well logging apparatus includes two diametrically opposed magnets which produce a static and substantially homogeneous magnetic field. Each magnet has a magnet axis and is partitioned into a first and a second magnet segment by a plane substantially parallel to the magnet axis.

Magnet assembly for nuclear magnetic resonance well logging tools

Growing community of inventors

Paris, France

Donald Charles McKeon