Description of the Application.
The real time and in-situ analysis of natural gas composition is a powerful tool in oil&gas industry for estimating reserves, rock characterization and assisted drilling. Laser based optical techniques represent suitable solutions for addressing this tasks, since they exploit the laser’s narrow spectral resolution and allow for unambiguous detection of trace gas for each component in downhole samples. To date it has been demonstrated that trace gas species can be optically detected with sensitivities down to parts – per – quadrillion concentration levels when operated in controlled environment, such as research laboratories. Therefore, laser-based techniques are excellent candidate for hydrocarbon identication in the part-per-billion up to part-per-million concentration scale for real world applications. The biggest challange is rather the extention of detection dynamic range to the percent scale. Infact, a typical sample of natural gas contains >80% of methane and the rest divided among the heavier molecules such as ethane, propane, butane. In this context, the concentrations to be measured are way beyond the sensitivity of the spectrometer and absorption non-linearity as well as saturation in the sensor response may occur. One of the smartest solution to address these issues is the dilutions of the natural gas mixture with pure nytrogen in ratios that can vary from 1/10 down to 1/20.
Benefits and Savings.
The gas blender GB100 Series turned out to be a reliable and compact device for diluting the gas sample and generate a controlled flow to be directly fed to the spectrometer. With this configuration the sensor is able to operate in a comfortable range, measure the hydrocarbon concentrations and re-calculate the actual values according to the dilution ratio used. The potential developments for in-situ gas analyzers is the integration of dilution/sampling systems inside the sensors.
READ THE SCIENTIFIC PAPER.
Journal: SPIE Digital Library
Title: Partial least squares regression as novel tool for gas mixtures analysis in quartz-enhanced photoacoustic spectroscopy
GAS SPECTROMETER - MASS FLOW
The Polytechnic University of Bari (Italian: Politecnico di Bari) is a university located in Bari, Italy. It was founded in 1990 and it is organized in 3 Faculties.
In 2016, around 9752 students were enrolled. In 2013, the professors, researchers and assistants amounted to 302 people.
The Polytechnic University of Bari is the youngest among the Italian polytechnic universities. Even though other Italian universities also incorporate engineering and science faculties, Italian polytechnic universities are focused on technological faculties and subjects.