Reaction Mechanisms in Petroleum: From Experimentation to Upgrading and Geological Conditions

TL;DR

This paper demonstrates that laboratory hydrocarbon cracking results cannot be directly applied to geological conditions, emphasizing the need for detailed kinetic models to accurately predict hydrocarbon evolution in reservoirs.

Contribution

The authors develop a comprehensive kinetic model with 52 reactants to better simulate hydrocarbon reactions across a wide range of geological conditions.

Findings

Laboratory data do not directly extrapolate to reservoir conditions

A detailed kinetic model can predict hydrocarbon evolution in reservoirs

The model covers temperatures 150-500°C and pressures 1-1500 bar

Abstract

Among the numerous questions that arise concerning the exploitation of petroleum from unconventional reservoirs, lie the questions of the composition of hydrocarbons present in deep seated HP-HT reservoirs or produced during in-situ upgrading steps of heavy oils and oil shales. Our research shows that experimental hydrocarbon cracking results obtained in the laboratory cannot be extrapolated to geological reservoir conditions in a simple manner. Our demonstration is based on two examples: 1) the role of the hydrocarbon mixture composition on reaction kinetics (the "mixing effect") and the effects of pressure (both in relationship to temperature and time). The extrapolation of experimental data to geological conditions requires investigation of the free-radical reaction mechanisms through a computed kinetic model. We propose a model that takes into account 52 reactants as of today, and which can be continuously improved by addition of new reactants as research proceeds. This model is complete and detailed enough to be simulated in large ranges of temperature (150-500\degree C) and pressures (1-1500 bar). It is thus adapted to predict the hydrocarbons evolution from upgrading conditions to geological reservoirs.