Schlumberger Technology Corporation

Philip Rabbito

Oliver Clinton Mullins

Bhavani Raghuraman

Gale Hyslip Gustavson

Edward Harrigan

Xu Wu

Ricardo Vasques

Toru Terabayashi

Torleif Torgersen

Li Jiang

Timothy Gareth John Jones

Andrew L Kurkjian

Go Fujisawa

Anthony Robert Holmes Goodwin

Moin Muhammad

Kazuyoshi Kegasawa

Lawrence E McGowan

Jinglin Gao

Craig Borman

Fredrick A Jenet

Maria A Van Agthoven

A method for analyzing formation fluid in earth formation surrounding a borehole includes storing analytical reagent in a reagent container in a fluids analyzer in a formation tester and moving the formation tester, including the reagent, downhole. Reagent from the reagent container is injected into formation fluid in the flow-line to make a mixture of formation fluid and reagent. The mixture is moved through a spectral analyzer cell in the fluids analyzer to produce a time-series of optical density measurements at a plurality of wavelengths. A characteristic of formation fluid is determined by spectral analysis of the time-series of optical density measurements.

Fluid analyzer for determining fluid chemistry of formation fluid by downhole reagent injection spectral analysis

Determining fluid chemistry of formation fluid by downhole reagent injection spectral analysis

Methods and apparatuses for high-temperature and high-pressure measurement of pH and/or alkalinity of a fluid is described.

Spectroscopic pH measurement at high-temperature and/or high-pressure

The invention concerns an apparatus for analysing water chemistry. According to the invention, the apparatus is adapted to operate downhole and comprises a colouring agent supply device for supplying a colouring agent to a water sample, the colour of the water sample thus supplied being indicative of the water sample chemistry, and a colorimetric analyser arranged to determine the colour of the water sample.

Apparatus and method for analysing downhole water chemistry

Methods of analyzing formation fluids in an oilfield environment are near-infrared absorption spectroscopy. Indications of near-infrared absorptions are analyzed to determine the concentration of compounds in a formation fluid sample.

Methods and apparatus for determining chemical composition of reservoir fluids

Methods of detecting carbon dioxide in downhole environments are provided. Near-infrared light is transmitted through a gas downhole. Indications of near-infrared absorptions are detected from the gas and used to determine the presence of carbon dioxide.

Method of detecting carbon dioxide in a downhole environment

A method of locating in situ hydrocarbons in underground formations comprises illuminating the borehole wall with light such as visible, infrared or ultraviolet light or combinations of these, from a source in a tool such as a wireline logging tool or an LWD tool, detecting any fluorescent radiation with a detector in the tool and analyzing the florescent radiation to determine the presence of hydrocarbon in the formation. The tool is moved through the borehole while irradiating the formation and detecting fluorescence. The borehole wall is illuminated and fluorescence detected through a window in the tool which is pressed against the borehole wall with sufficient force to displace any mudcake. The window is made of a wear resistant material such sapphire or diamond and is conveniently secured in a wear resistant housing which might be made of tungsten carbide or the like.

Method and apparatus for fluorescence logging

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Milford, CT, United States of America

Philip Rabbito