摘要
利用建立的细长管流动模型,进行了蒸汽驱泡沫剂的热降解实验研究,以确定添加的泡沫剂在蒸汽腔中的持久性。细长管流动模型中装填辽河油田锦45块于楼油层实际岩心砂,在中国蒸汽驱典型区块的油藏压力与饱和蒸汽温度条件下进行20 d实验,结合实验结果与理论公式计算分析后发现:添加的泡沫剂热降解反应模式为一级反应,200℃、250℃和300℃下的热降解速率常数分别为9.35×10-8 s-1、17.80×10-8 s-1和24.53×10-8 s-1。建立了泡沫剂热降解动力学模型,可以计算任意温度条件下泡沫剂热降解速率和半衰期,100℃、150℃、200℃、250℃和300℃时,泡沫剂的半衰期分别为370 d、160 d、83 d、49 d和31 d,说明对中国大多数注蒸汽油藏可以通过注入泡沫剂改善注蒸汽开发效果,但对于深层高压稠油油藏,当温度超过300℃时,泡沫剂持久性较差。
A fine-long tube model was established for carrying out the thermal degradation experiments of steam foam to determine the foam stability in steam chamber. The real core sand from the Yulou oil layer of Block Jin45 of Liaohe Oilfield was packed in the model, and the experiment lasting for twenty days was conducted under the typical reservoir pressure and saturated steam temperature. The analysis on the experimental results and theoretical calculation results indicates that the thermal degradation reaction model of the added foam is the first-order reaction, and the degradation rate constants at the temperatures of 200 ~C, 250 ~C, and 300 ~C are 9.35~10-8 s-L, 17.80x10-8 s-l, and 24.53~ 10-8 s-~ respectively. The foam thermal degradation rate kinetic model was deduced, which can be used to calculate the foam thermal degradation rate and half-life at any temperature condition. The half-lives of the added foam are 370 d, 160 d, 83 d, 49 d and 31 d at the temperatures of 100 ℃, 150 ℃, 200℃, 250℃and 300 ℃ respectively, which indicates that the production performance of most of the heavy oil reservoirs developed by steam drive in China can be improved by injecting foam agent. But in terms of the deep and high-pressure heavy oil reservoirs, the foam stability is poor when the saturated steam temperature is over 300℃.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2015年第5期652-655,共4页
Petroleum Exploration and Development
基金
国家科技重大专项"稠油油藏多元热流体开发技术"(2011ZX05012-005)
关键词
蒸汽驱
泡沫剂
热稳定性
热降解速率
稠油开采
steam drive
foam agent
thermal stability
thermal degradation rate
heavy oil recovery
