摘要
为判识原油改质程度和原油火驱过程中燃烧状态,对稠油火驱前后样品的全烃色谱指纹特征进行分析,探索了火驱开发过程中燃烧状态的识别方法,并对稠油高、低温氧化特征进行了研究,取得的成果在Du66块火驱取心井分析中得到应用。研究表明,全烃色谱指纹技术可对比火驱反应前后样品的微小特征变化。稠油在低温氧化阶段,姥鲛烷与nC_(17)、植烷与nC_(18)比值增大,正构烷烃相比姥鲛烷、植烷更易受低温氧化作用的影响,CPI和OEP升高;在高温氧化阶段,原油明显改质,原油轻重比显著增大。利用该技术方法判识Shu1-46-K037取心井火烧层段,分析认为埋深约为978.15 m的岩心具有高温氧化的特征,可能是火驱的过火层段。稠油火驱过程中,全烃色谱指纹分析技术可作为识别燃烧状态的有效手段,为火驱效果综合评价奠定了基础。
For the sake of discriminating the crude oil upgrade level and the combustion state in the course of fire flood,the total hydrocarbon chromatography minutiae of heavy oil samples before and after fire flood were analyzed,the identification method of combustion state in the course of fire flood development was explored,the oxidation feature of heavy oil at high and low temperatures was studied,and the achieved results were applied in the analysis on fire flood coring wells in Du66 block. The study results showed that the total hydrocarbon chromatography signature technique could compare the minute feature variation of samples before and after fire flood reaction. At low temperature oxidation stage of heavy oil,the pristane / n C17 and phytane / n C18 ratios increased,the normal alkane was more easily affected by the low temperature oxidation than the pristane and phytane,and CPI and OEP increased; whereas at high temperature oxidation stage,the crude oil was upgraded apparently,and the light / heavy ratio of crude oil was remarkably increased. This technique was used to discriminate the combustion interval of coring well Shu1- 46- K037,and it was believed through analysis that the core taken from about 978. 15 m buried depth was characterized by high temperature oxidation,indicating a possible burned interval of fire flood. In the course of fire flood of heavy oil,the total hydrocarbon chromatography signature analysis technique can be taken as an effective means to identify the combustion state,and it has laid a foundation for the integrated evaluation on fire flood effect.
出处
《特种油气藏》
CAS
CSCD
北大核心
2015年第6期80-84,144-145,共5页
Special Oil & Gas Reservoirs
基金
国家科技重大专项"渤海湾盆地辽河坳陷中深层稠油开发技术示范工程(二期)"(2011ZX05053)专题"直井火烧油层调控技术示范"
关键词
指纹分析技术
全烃色谱
火驱
稠油油藏
燃烧状态
Du66块
signature analysis technique
total hydrocarbon chromatography
fire flood
heavy oil reservoir
combustion state
Du66 block
