Selecting X-Ray Energy Levels for Three-Phase Saturation Measurements (2005)

Selecting X-Ray Energy Levels for Three-Phase Saturation Measurements A. S. Lackner; A. S. Lackner NTNU Search for other works by this author on: This Site Google Scholar G. Haaskjold; G. Haaskjold Hydro ASA Search for other works by this author on: This Site Google Scholar O. Torsaeter O. Torsaeter NTNU Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Latin American and Caribbean Petroleum Engineering Conference, Rio de Janeiro, Brazil, June 2005. Paper Number: SPE-95098-MS https://doi.org/10.2118/95098-MS Published: June 20 2005 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Lackner, A. S., Haaskjold, G., and O. Torsaeter. "Selecting X-Ray Energy Levels for Three-Phase Saturation Measurements." Paper presented at the SPE Latin American and Caribbean Petroleum Engineering Conference, Rio de Janeiro, Brazil, June 2005. doi: https://doi.org/10.2118/95098-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Latin America and Caribbean Petroleum Engineering Conference Search Advanced Search Abstract The effect of pressure and rock type on optimal dual energy levels and minimalisation of saturation uncertainties for three-phase core experiments was investigated.X-ray scanning of a composite core comprising of two chalk plugs and one Berea sandstone core was done. Reference scans using CO2, natural seawater, n-Ci10 and a CO2/n-Ci10 mixture at four pressure stages and five different pre-defined dual energy levels were acquired. Two unique typical given saturations were input together with data from the reference scans in a routine for back-calculating three-phase intensity data. A detailed uncertainty analysis using these synthetic three-phase data and combining low and high energies was performed. The resulting combination of low and high energy level giving the lowest uncertainty was selected as a given setting for all dynamic scans. Saturated with live oil, the core was waterflooded while dynamic X-ray scans were acquired. After the waterflood, the core was depleted below the bubble point to atmospheric pressure while scans were acquired continuously.The results show that the rock type largely effects the selection of energy levels for both two- and three-phase X-ray scans. To minimise the uncertainty, the chalks generally required a higher low energy level independent of pressure than the sandstone. Also, at high pressures and for all rocks the optimal high energy level was found in the same range. At lower pressures, a lower high energy level was favourable. Keywords: calculation, saturation measurement, barg, three-phase saturation measurement, pvt measurement, rock type, intensity, energy level, experiment, enhanced recovery Subjects: Fluid Characterization, Improved and Enhanced Recovery, Formation Evaluation & Management, Phase behavior and PVT measurements Copyright 2005, Society of Petroleum Engineers You can access this article if you purchase or spend a download.