Modelling Of C02 Leakage in Cement Plug in Abandoned Well

• Main Author: Mohamed Yousop, Muhammad Adib
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi PETRONAS 2012
• Subjects: TP Chemical technology
• Online Access: http://utpedia.utp.edu.my/9871/1/2012%20-%20Modeling%20of%20CO2%20Leakage%20in%20Cement%20Plug%20in%20Abandoned%20Well.pdf; http://utpedia.utp.edu.my/9871/

Greenhouse gasses emission is serious problem to the environment. Carbon capture and storage is one of the methods to control and reduce the number of gasses release. There is a significant amount of CO2 stored in the well bore that suffered from leakage. The potential leakage paths of C02 can be identified thorough the cement plug in the abandoned wellbore due to the exposure of high CO2 concentration after years of operation. The permeability and integrity of the cement will determine how effective it is in preventing leakage. This research is to discover the effects of permeability of the cement plug which is made by Portland cement' with the risk of CO2 leakage from abandoned well in Carbon Capture and Storage projects. A computational fluid dynamics tools, ANSYS FLUENT will be employed where the solution of K-epsilon Model and Eddy Dissipation model in the wellbore geometry is sought. However, the reaction of Portland cement has to be defined earlier before the permeability of cement plug can be determined using Darcy Law equation. The flow will be modelled and simulated in which the effect of permeability will be studied. The results show the mass fraction of calcium bicarbonate has been increased after the iteration is completed and the value of the density at different cement length is obtained from the simulation. The density is found to be decreased by the increment of cement plug length, thus it given high value of permeability at face sizing of 200000umand 2135 numbersof mesh elementsis applied in the model.