强化空气泡沫体系的长期有效性

PerformanceofPolymer-EnhancedAirFoamSystemafterAging

魏鹏 蒲万芬 孙琳 吴轶君 李斌 柳敏

WEI Peng PU Wanfen SUN Lin WU Yijun LI Bin LIU Min

在漫长的驱油过程中，强化空气泡沫驱体系势必发生一些不利于驱油的变化。针对研制的强化空气泡沫体系（0.1% 十二烷基硫酸钠ZD8 + 0.05% 甜菜碱G5 + 0.2% 疏水缔合聚合物WP8），在90℃下对强化泡沫体系（以下简称ZGP 体系）和老化后的强化泡沫体系（以下简称ZGPA 体系）进行一系列的性能对比研究，并进行了泡沫驱替实验。实验结果表明，ZGPA 体系的析液半衰期为522 s，仅为ZGP 体系的1/3。ZGP 泡沫体系能够形成更完整、致密的多层次网络结构，泡沫壁整体性较好；而ZPGA 体系泡沫中的骨架结构疏松、泡沫壁整体性较差、气泡大小均匀性差。两者均具有较好的耐油性，ZGPA 体系的相对较差。在泡沫驱替实验中，ZGP 体系泡沫的阻力系数增加较快，后续阻力系数是ZGPA 体系的4 数5 倍。在水驱基础上，两者提高原油采收率分别为47.5% 和25.7%。图7 表3 参12

Some unfavorable changes of the polymer-enhanced air foam systemmusthave taken place in the process of long-term oil-displacement. Aiming at the polymer-enhanced air foam system，composed of 0.1% lauryl sodium sulfate（ZD8），0.05%betaine（G5）and 0.2% HAWP（WP8），a series of comparative study on the performance of the polymer-enhanced foam （briefly named as ZGP ）and polymer-enhanced foam after aging（briefly named as ZGPA ）were conducted at the temperature of 90℃. The results showed that the half-life of the ZGPA foam drainage was of 522 s，which was only one third of that of the ZGP foam drainage. SEM analysis indicated that ZGP could form the orderly and dense multi-layered network structure，which made better holistic performance in the thick foam films. Whereas ，the skeleton structureof ZGPA was loose ，the bubble wall displayed the inferiorintegrity ，and the bubble size was lack of homogeneity.The above two foam systems had remarkable oil resistance ，in contract，ZGPA wasinferior. The performance of foam flooding experiments showed that，the resistance coefficient of ZGP foams increased significantly and the subsequent resistance coefficient was four or more times higher than that of ZGPA foams. Based onthe water flooding ，the oil recovery was enhenced for 25.7% and47.5%，by ZGP and ZGPA system，respectively.