Study on optimization of viscosity reducing performance of viscosity reducing agent for heavy oil by response surface method
In order to solve the problem of heavy oil of Mao l well in Inner Mongolia,which is difficult to be extracted by traditional technology,an oil soluble viscosity reducing agent was prepared by using octadecyl acrylate,2-acrylamido-2-methyl propanesulfonic acid and styrene as raw materials.Based on the Box-Behnken response surface design method,the influence of three factors including the amount of benzoyl peroxide(BPO)initiator,the reaction time and the reaction temperature,as well as their interactions on the viscosity reducing performance of the viscosity reducing agent was analyzed.The results showed that the influence of the three factors on the viscosity reducing performance of the viscosity reducing agent was in the order of reaction time＞amount of BPO initiator＞reaction temperature;the interactions between the amount of BPO initiator and reaction temperature were extremely significant,while the interactions of other factors were not significant.The optimal reaction conditions for synthesizing viscosity reducing agent were as follows:m(BPO):m(total monomer)=1.2％,the reaction time was 5 h,the reaction temperature was 70 ℃.The viscosity reducing rate of the viscosity reducing agent under this optimal condition was 48.73％,which was essentially consistent with the theoretical value.After adding the viscosity reducing agent,the yield stress and viscosity values of heavy oil decreased to 131 Pa and 18 756 mPa·s,respectively,and the initial decomposition temperature of the viscosity reducing agent was 200 ℃.The recovery rate of the indoor simulated oil displacement of heavy oil in Mao1 well was increased up to 11.22％.
heavy oilviscosity reducing agentoil solubilityresponse surface method
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