Evaluating the petrophysical properties due to the interaction between C 02 - fluids and reservoir rock

• Published in: Ingeniería y Región
• Main Authors: Sepúlveda Gaona, Jairo Antonio, Losada, Juan Diego
• Format: Article in Journal/Newspaper
• Language: Spanish
• Published: Universidad Surcolombiana 2015
• Subjects: Carbón dioxide; petrophysical properties; wettability; mineral alteration; interfacial tensión; solubility; Dióxido de carbono; propiedades petrofísicas; mojabilidad; alteración mineral; tensión interfacia; solubilidad; Roca; Carbonic acid
• Online Access: http://journalusco.edu.co/index.php/iregion/article/view/732; https://doi.org/10.25054/22161325.732

This paper developed a methodology to allowed evaluating and understanding the alterations of fluids and reservoir rock due to contact with a system involving C02, by using experimental procedures and correlations, that offered the ability to have an idea of what might happen in the reservoir. Dissolved C02 in the brine, generates carbonic acid, therefore, when a mineral comes in contact with a brine saturated in C02 that wasn't in equilibrium previously, the mineral starts to dissolve in order to achieve equilibrium with the brine. The dissolution of mineral changes the composition of the brine and can lead precipitation of secondary minerals. Interaction rock - fluid depends on the type of formation rock (carbonate or sandstone). Interactions that are generates between C02 - oil, may produce benefits as formation damage. If the ratio resinasphaltene is low, crude oil in contact with the C02 will cause the precipitation of asphaltene, providing a formation damage, which added to the mineral alteration product of interaction with carbonic acid, will affect the permeability and wettability of reservoir rock. However, when increasing the solubility of C02 in oil, this results in a decrease of the oil viscosity increasing oil swelling and reducing superficial tensión, improving oil mobility anddecreasing Sor. En este artículo se desarrolla una metodología que permita evaluar y conocer las alteraciones sufridas por los fluidos y la roca del yacimiento al estar en contacto con un sistema que involucre el C02, mediante el uso de procedimientos experimentales y correlaciones, que brindarán la posibilidad de tener una idea de lo que pueda suceder en el yacimiento. El C02 al disolverse en la salmuera, genera ácido carbónico, por lo tanto, cuando un mineral entra en contacto con salmuera saturada de C02 que no estaba en equilibrio con anterioridad, el mineral empieza a disolverse con el fin de alcanzar el equilibrio con la salmuera. La disolución del mineral cambia la composición de la salmuera y puede conducir la ...