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Vol. 227, Issue 11, November 2018, pp. 82-87

 

Bullet

 

High Temperature Fluorescence Sensor for Oilfield Applications
 

* Sebastian Csutak, Greg Bernero, Gregory Ham

Aramco Services Company: Aramco Research Center –Houston 17155 Park Row 77084 Houston TX
Tel.: 713 432 4479, Fax: 713 432 4279

* E-mail: Sebastian.Csutak@aramcoservices.com

 

Received: 31 July 2018 /Accepted: 28 September 2018 /Published: 30 November 2018

Digital Sensors and Sensor Sysstems

 

Abstract: Optical fluorescence spectra of crude oils depends on the concentrations of certain chemical components, such as asphaltenes, saturates and aromatics present in these oil samples. In this work, we report a high temperature optical fluorescence spectrometer tool for in situ measurements. This instrument uses a miniaturized spectrometer with a small semiconductor laser source and an optical reflection probe. The miniature sensor was controlled with an Arduino Nano device. We have tested our spectrometer to elevated temperatures present in borehole conditions (100 °C). The results indicate that our logging tool will be able to measure ~95 % of our liquid wells. The fluorescence measurements were compared to standard Saturates- Aromatic-Resins-Asphaltenes (SARA) and Gas Chromatograph (GC) data. The results indicate that the fluorescence spectra could be potentially used to estimate the chemical components of the crude oils. Saturates-Aromatic-Resins-Asphaltenes and Gas Chromatograph measurements are not available downhole, but fluorescence spectroscopy could be used to measure density stratification inside an oil reservoir, which can guide production strategies. It can alert production engineers to heavier crudes, which are less valuable and can be problematic to produce. It can also identify condensate-rich zones in wet gas reservoirs, so that these more valuable zones can be targeted for production.

 

Keywords: Optical sensors, CMOS sensors, Arduino, Fluorescence, Downhole tool, Oil density.

 

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