Bhavani Raghuraman
Schlumberger
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Publication
Featured researches published by Bhavani Raghuraman.
Journal of Chromatography A | 2011
G. Todd Ventura; Gregory J. Hall; Robert K. Nelson; Glenn S. Frysinger; Bhavani Raghuraman; Andrew E. Pomerantz; Oliver C. Mullins; Christopher M. Reddy
The accurate establishment of oil similarity is a longstanding problem in petroleum geochemistry and a necessary component for resolving the architecture of an oil reservoir. Past limitations have included the excessive reliance on a relatively small number of biomarkers to characterize such complex fluids as crude oils. Here we use multiway principal components analysis (MPCA) on large numbers of specific chemical components resolved with comprehensive two-dimensional gas chromatography-flame ionization detection (GC×GC-FID) to determine the molecular relatedness of eight different maltene fractions of crude oils. MPCA works such that every compound eluting within the same first and second dimension retention time is quantitatively compared with what elutes at that same retention times within the other maltene fractions. Each maltene fraction and corresponding MPCA analysis contains upwards of 3500 quantified components. Reservoir analysis included crude oil sample pairs from around the world that were collected sequentially at depth within a single well, collected from multiple depths in the same well, and from different depths and different wells but thought to be intersected by the same permeable strata. Furthermore, three different regions of each GC×GC-FID chromatograms were analysed to evaluate the effectiveness of MPCA to resolve compositional changes related to the source of the oil generating sediments and its exposure to biological and/or physical weathering processes. Compositional and instrumental artefacts introduced during sampling and processing were also quantitatively evaluated. We demonstrate that MPCA can resolve multi-molecular differences between oil samples as well as provide insight into the overall molecular relatedness between various crude oils.
Applied Spectroscopy | 2006
Bhavani Raghuraman; Gale Gustavson; R. E. G. Van Hal; Emilie Dressaire; Oleg Zhdaneev
The spectroscopic technique for pH measurement is a well-established laboratory technique that can give high-accuracy pH values. Recent studies have shown the advantage of this technique over standard potentiometric methods for pH measurements in fresh water and seawater and also at high temperatures and pressures. However, a limitation of the spectroscopic technique is that a single pH dye is sensitive only over a narrow pH range. We have developed optimized dye mixtures that are both sensitive and accurate over a broad pH range. The measurement is robust and simple, requires a minimum of two wavelengths, and is independent of the volume of the dye mixture added. Optimization of the dye mixture formulation to maximize accuracy in a broad range of pH involves varying both the dye type and its mole fraction and also accounting for spectral noise. This technique has been successfully applied for in situ pH measurements of oilfield formation waters.
Archive | 2002
Bhavani Raghuraman; Benoit Couet
Organic Geochemistry | 2010
G. Todd Ventura; Bhavani Raghuraman; Robert K. Nelson; Oliver C. Mullins; Christopher M. Reddy
Archive | 2005
Lalitha Venkataramanan; Go Fujisawa; Bhavani Raghuraman; Oliver C. Mullins; Andrew Carnegie; Ricardo Vasques; Chengli Dong; Kai Hsu; Michael O'Keefe; Henry-pierre Valero
Archive | 2011
Ronald E. G. Van Hal; Anthony R. H. Goodwin; Oliver C. Mullins; Peter S. Hegeman; Bhavani Raghuraman; Soraya S. Betancourt; Cosan Ayan; Ricardo Vasques; Francois Xavier Dubost; Christopher S. Del Campo
Archive | 2009
Min-Yi Chen; Bhavani Raghuraman; Ian D. Bryant; Michael Supp; Jose Navarro
Journal of Chromatography A | 2007
Christopher M. Reddy; Robert K. Nelson; Sean P. Sylva; Li Xu; Emily A. Peacock; Bhavani Raghuraman; Oliver C. Mullins
Archive | 2011
Li Jiang; Oliver C. Mullins; Gale Gustavson; Christopher Harrison; Bhavani Raghuraman; Ronald E. G. Van Hal; Jimmy Lawrence; Kosta Ladavac; A. Ballard Andrews; Timothy Gareth John Jones; Rogerio Tadeu Ramos
Archive | 2005
Philippe Salamitou; Joyce Wong; Bhavani Raghuraman; Jagdish Shah; Ronald E. G. Van Hal; Robert J. Schroeder; Patrick Tabeling