MODELING DENSITY EFFECTS IN CO2 INJECTION IN OIL RESERVOIRS AND A CASE STUDY OF CO2 SEQUESTRATION IN A QATARI SALINE AQUIFER
油藏CO2注入中的密度效应模拟及卡塔尔盐水层CO2封存案例研究
ABSTRACT
CO2 Injection has been used to improve oil recovery for several decades. In recent years, CO2 injection has become even more attractive because of a dual effect; injection in the subsurface 1) allow reduction of CO2 concentration in the atmosphere to reduce global warming, and 2) improve the oil recovery.
In this study, the density effect from CO2 dissolution in modelling of CO2 injection is examined. A method to model the increase in oil density with CO2 dissolution using the In this study, the density effect from CO2 dissolution in modeling of CO2 injection is Peng - Robinson equation of state and the Pedersen viscosity correlation is presented. dissolution in a West Texas crude oil. compositional simulation of CO2 injection was results show that the density increase from CO2 dissolution may have a drastic effect on This method is applied to model the observed increase in oil density with CO performed in a 2D vertical cross section and a 3D reservoir with the density effect. The there is a need to have accurate density data for CO2/oil mixtures at different CO2CO2 flow path and recovery performance. One main conclusion from this work is that concentrations to ensure successful CO2 injection projects.
While CO2 enhanced oil recovery ( EOR ) is part of the solution , saline aquifers have the largest potential for CO2 sequestration . A literature review of the CO2 sequestration in saline aquifers is performed. The dominant trapping mechanisms and transport processes and the methods used to model them are discussed in detail. The Aruma aquifer, a shallow saline aquifer in southwest Qatar is used as a case study for CO2 sequestration. A compositional simulation model is prepared for the Aruma aquifer using the available CO2 sequestration accurately. It affects the propagation of the CO2 plume and amount of log data and flow test data. It was found that the grid size is a key parameter in modeling CO2 dissolved in brine.
