Effect of Chemical EOR on Class G Oilwell Cement Integrity under Elevated Conditions
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- 作者：Nur Syahirah Alias ; nursyahirahalias@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Syahrir Ridha ; Utami Yerikania
- 关键词：Class G ; Cement ; Integrity ; Oilwell ; Chemical ; EOR
- 刊名：Procedia Engineering
- 出版年：2016
- 出版时间：2016
- 年：2016
- 卷：148
- 期：Complete
- 页码：1066-1073
- 全文大小：310 K
文摘
EOR which stands for Enhanced Oil Recovery is the technique applied to most of oilfield operation according to the chronological order of the reservoir production. Chemical EOR is one of tertiary methods in enhanced oil recovery which increase the mobility of the oil in order to increase extraction. Surfactant flooding and polymer methods are among the chemical methods. Surfactants (detergents) are injected to alter the surface tension between the water and oil in the reservoir, mobilizing oil which would otherwise remain in the reservoir as residual oil. It is considered to be the most promising chemical method in recent years. Chemical EOR works on interfacial tension (IFT) reduction, wettability alteration, emulsification and mobility control, can alter the cement properties and degrade the cement strength. This study concentrates on the impact of injected chemical EOR toward cement integrity, to minimize the loss of cement integrity or the collapse of the wellbore. In this study, polymer and surfactant were representing the chemical EOR. Polymer was prepared by mixing 1 g dry polymer with 199 g brine water. Surfactant was also prepared after diluting 100 g surfactant solution into two liters brine water. Cement cube samples prepared were exposed into these chemicals with the temperature conditions of 100oC, 110oC and 130oC for polymer and 130oC for surfactant and pressure of 2000 psi for 7, 14 and 21 days. The result indicated no significant impact on cement strength reduction. It is seen that only 7% strength percentage difference after being exposed to polymer at 100oC. The temperature changes are proven to have role in cement strength differences.