Development of an equation-of-state thermal flooding simulator

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Title: Development of an equation-of-state thermal flooding simulator
Author: Varavei, Abdoljalil
Abstract: In the past thirty years , the development of compositional reservoir simulators using various equations of state (EOS ) has been addressed in the literature . However , the development of compositional thermal simulators in conjunction with EOS formulation has been ignored , in particular . Therefore in this work , a fully implicit , parallel , compositional EOS -based simulator has been developed . In this model , an equation of state is used for equilibrium calculations among all phases (oil , gas , and aqueous ) . Also , the physical properties are calculated based on an equation of state , hence obviating the need for using steam tables for calculation of water /steam properties . The governing equations for the model comprise fugacity equations between the three phases , material balance , pore volume constraint and energy equations . The governing partial differential equations are solved using finite difference approximations . In the steam injection process , the solubility of oil in water -rich phase and the solubility of water in oil phase can be high . This model takes into account the solubility of water in oil phase and the solubility of hydrocarbon components in water -rich phase , using three -phase flash calculations . This simulator can be used in various thermal flooding processes (i .e . hot water or steam injections ) . Since the simulator was implemented for parallel computers , it is capable of solving large -scale thermal flooding problems . The simulator is successfully validated using analytical solutions . Also , simulations are carried out to compare this model with commercial simulators . The use of an EOS for calculation of various properties for each phase automatically satisfies the thermodynamic consistency requirements . On the other hand , using the K -value approach , which is not thermodynamically robust , may lead to results that are thermodynamically inconsistent . This simulator accurately tracks all components and mass transfer between phases using an EOS ; hence , it will produce thermodynamically consistent results and project accurate prediction of thermal recovery processes . Electrical heating model , Joule heating and in -situ thermal desorption methods , and hot -chemical flooding model have also been implemented in the simulator . In the electrical heating model , electrical current equation is solved along with other governing equations by considering electrical heat generation . For implementation of the hot -chemical heating model , first the effect of temperature on the phase behavior model and other properties of the chemical flooding model is considered . Next , the material and energy balance and volume constraints equations are solved with a fully implicit method . The models are validated with other solutions and different cases are tested with the implemented models .
URI: http : / /hdl .handle .net /2152 /6614
Date: 2009-10-22

Citation

Development of an equation-of-state thermal flooding simulator. Doctoral dissertation, The University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /6614 .

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