Determining Reservoir Connectivity and Compositional Grading by Mapping Asphaltene Gradients (Russian)

Tsiklakov, Alexander; Weinheber, Peter; Wichers, Wicher Roelf; Zuo, Julian Y.; Zimin, Sergey; Driller, Anna; Oshmarin, Roman

doi:10.2118/160590-ru

Cited by 1 publication

(1 citation statement)

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“…Considering that the three samples were collected at similar depth conditions, the differences in the physicochemical properties of the three samples can be explained by the areal variations in composition that extra-heavy (Kalehbasti et al, 2011). The compositional variations are mainly caused, but not exclusively, by the distribution and molecular weight of asphaltenes of extra-heavy crude oils (Elshahawi et al, 2007;Weinheber et al, 2012). Considering that properties of paraffins, naphtenes and aromatics may also vary along the reservoir, fluid parameters that depends on the interaction of the SARA fractions for extra-heavy oils can show important variations in physicochemical properties (like viscosity), for the same reservoir fluid, within the geological system (Danesh, 1998).…”

Section: Kinetics Theorymentioning

confidence: 99%

Thermogravimetric and differential thermogravimetric analysis of effect of areal compositional gradient on combustion kinetics of Mexican extra-heavy crude oil

Avendaño-Salazar

Ramírez-Jaramillo

Cruz

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Numerous studies have contributed to a better understanding of the in-situ combustion process that have allowed to determine the most suitable conditions to carry out this process in reservoirs from volatile to extra-heavy crude oils. One of the elements that alter the behavior of this process is the compositional gradient. In this work, the effects of areal compositional variations in the in-situ combustion of three Mexican extra-heavy crude oil samples obtained from the same reservoir and extracted under similar production conditions were studied. Physicochemical, thermal, and kinetics analyses (by means of one non-linear method) were carried out to study the areal compositional variations of the extra-heavy crude oil samples, and their effect on the in-situ combustion of this type of crude oil was also analyzed. Physicochemical characterization includes measurements of viscosity, density, water content, and SARA content. Thermal analyses were performed using three heating rates (5 °C/min, 10 °C/min, and 15 °C/min), while kinetic analyses were calculated using Friedman’s method.

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Section: Kinetics Theorymentioning

confidence: 99%