非烃气体对超稠油降粘效果评价实验研究  

Experimental Research on Viscosity Reduction Effect of Non-Hydrocarbon Gases on Super Heavy Oil

作　　者：柴晓龙 CHAI Xiao-long(Northeast Petroleum University,Heilongj iang Daqing 163318,China)

机构地区：[1]东北石油大学,黑龙江大庆163318

出　　处：《当代化工》2018年第6期1188-1190,1194,共4页Contemporary Chemical Industry

基　　金：国家科技重大专项;项目编号:2016ZX05012-002-006

摘　　要：超稠油油藏原油具有粘度极大,流体不流动的特点,如何降低原油粘度是油田高效开发超稠油油藏的关键出发点。以辽河油田杜84区块为研究目标,分析非烃气体CO_2和N_2对原油粘度的影响效果。通过实验证明:对于超稠油,CO_2和N_2均有降低稠油粘度的特性,N_2的降粘率仅为6%~13%,而CO_2的降粘幅度可达15.8%~25%,相比于N_2,CO_2更易于溶解于原油中,CO_2的降粘效果更加显著;随着温度的增大,N_2和CO_2的降粘作用越来越小。低温条件下,N_2和CO_2降粘幅度较大,而高温条件下,温度成为降粘效果的主控因素;着重考虑降粘效果,对于注入非烃气体提高超稠油采收率,注入CO_2更能提高超稠油油藏的采出程度。The super-heavy oil has characteristics of high viscosity and fluid non-flow. The key starting point for developing super-heavy oil reservoirs efficiently is how to reduce the viscosity of crude oil. In this paper, taking Liaohe oilfield Du84 block as the research object, the influence of non-hydrocarbon gases CO2 and N2 on the viscosity of crude oil was analyzed. The experiment results showed that both CO2 and N2 could reduce the viscosity of heavy oil. The viscosity reduction rate of super-heavy oil by N2 was barely 6% ~13%, while that of super-heavy oil by CO2 was 15.8% ~25%. In comparison with N2,CO2 was more easier to be dissolved in crude oil, so the effect of CO2 was more remarkable on reducing crude oil viscosity. And with the increase of temperature, the effect of N2 and CO2 on reducing crude oil viscosity was getting smaller and smaller. Under the condition of low temperature, the effect of N2 and CO2 on reducing the crude oil viscosity was better. Under the condition of high temperature, the temperature was the main controlling factor of viscosity reducing effect. Considering the effect of viscosity reduction, it＇s pointed out that injecting CO2 should be more suitable for improving recovery degree of extra-heavy oil.

关 键 词：超稠油 油田开发 非烃气体 降粘 提高采收率 

分 类 号：TE327[石油与天然气工程—油气田开发工程]