relation: https://khub.utp.edu.my/scholars/575/
title: An evaluation of gas diffusivity measurement in reservoir fluid from low to high pressure systems for oil recovery applications
creator: Zainal, S.
creator: Yee, H.V.
creator: Saaid, I.M.
creator: Jelani, J.
description: Gas diffusivity is a subject of interest in oil recovery projects. Its study is imperative in understanding the transport properties of two different species; gas and liquid. It enables the analysis of the rate of transport caused by concentration gradient. Considering that different gas and liquid systems have different diffusivities, there is a need to determine its value to be able to incorporate the effect of mass transfer in the design and planning of any gas injection and enhanced oil recovery projects; for instance, miscible gas flooding and non-thermal recovery of heavy oil by solvent injection. Diffusivity also assists in understanding methane hydrates formation and phase distribution process in a shut-in well. In reservoir engineering application specifically, diffusivity may be important when modeling gas displacement process at extremely low flow rate or in very small scale such as a micro-model. Even though there are a number of reported diffusivity experiments conducted around the world, limited information is available under elevated reservoir conditions. In the Malay Basin specifically, there is no evidence of diffusion coefficient experiments conducted at reservoir conditions for the petroleum industry applications. This might be due to the difficulty in measuring diffusivity, especially in multicomponent liquid systems. Even so, experiments are necessary as there is no universal theory to calculate diffusion coefficients from other known properties of the system. Each binary system is unique from one condition to another. This paper presents a review of reported experimental works on gas diffusivity. It compares different diffusivity measurement for different areas of oil recovery projects. This includes identification of laboratory apparatus and various experimental approaches and mathematical analyses of reported results. It then highlights the effects of pressure, operating temperature and binary system selection in validating the correct diffusivity test set-up before progressing to actual test involving multicomponent fluid system. Copyright 2009, International Petroleum Technology Conference.
date: 2009
type: Conference or Workshop Item
type: PeerReviewed
identifier:   Zainal, S. and Yee, H.V. and Saaid, I.M. and Jelani, J.  (2009) An evaluation of gas diffusivity measurement in reservoir fluid from low to high pressure systems for oil recovery applications.  In: UNSPECIFIED.     
relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-77952355810&partnerID=40&md5=0f457d87fb76044b75b5d5d156abc2d8