PVT Experimental And Modelling Study Of Some Shale Reservoir Fluids From Argentina

MARTÍN CISMONDI; TASSIN, N.G.; CANEL, C.; RABASEDAS, F.; GILARDONE, C.

BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING

BRAZILIAN SOC CHEMICAL ENG

Lugar: BRASIL; Año: 2018 vol. 35 p. 313 - 326

0104-6632

Shalereservoir fluids have been receiving much attention, specially during the lastdecade, due to the important reserves confirmed in many places around the worldand the recent production grow in United States, Argentina, and probably othercountries to follow. In some fields of the Vaca Muerta formation in Argentina,the fluids can be classified as gas condensate or near-critical in some cases,presenting retrograde condensation of up to 30% in volume.Thiswork presents compositional and PVT data of two gas condensate fluids, togetherwith a new methodology for assigning molecular weights and densities to thedifferent carbon number fractions, when measured values are available for thewhole fluid or liquid phase, and only a weight fraction is collected throughchromatography for each single cut. A thermodynamic modelling study of thesefluids, and also a third one classified as volatile oil, is based on both the PR(Peng and Robinson, 1976) and RKPR (Redlich Kwong Peng Robinson, apud Cismondi and Mollerup, 2005) equationsof state, together with different ways of characterizing the heavy fractions. Thefocus is on phase envelopes, but knowing only the saturation point at reservoirtemperature, and also on retrograde behavior.