科研之友
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摘要
Asphaltene deposition had always been a challenge for the flow assurance issues in oil industry due to both high removal costs and complex behavior in various temperature and composition conditions. These conditions could occur in any enhanced oil recovery (EOR) in the reservoir, and production of oil in tubing or surface facilities. The central composite experimental design of orthogonal type and response surface methodology (RSM) were used to develop reliable models to investigate the effects of input variables on asphaltene onset pressure (AOP). The considered input variables were the temperature and the gas mole% in CO2 and N-2 gas injection scenarios. Regression analysis showed agreement of the experimental data with the determination coefficient (R-2) values of 0.991 and 0.987 for CO2 and N-2 gas injection models, respectively. Analysis of variance (ANOVA) was employed to test the significance of the RSM polynomial models. ANOVA study showed, in CO2 injection model, the effect of temperature was greater than the gas mole%, while in N-2 injection model, the gas mole% effect was dominant over the temperature effect. By investigating the models, it was seen that in N-2 gas injection, any amount of gas increased the AOP at different temperatures. But in CO2 gas injection, depending on the temperature, AOP might rise or fall upon adding gas.
- 出版日期2017
