空气泡沫与二氧化碳泡沫特征分析研究  

Study on Characteristics of Air Foam and CO_2 Foam

作　　者：周国华[1,2] 王友启[1,2] 马涛[1,2] 许关利[1,2] 谭中良[1,2] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石化海相油气藏开发重点实验室,北京100086

出　　处：《中外能源》2015年第4期46-49,共4页Sino-Global Energy

基　　金：中国石化科技攻关项目"腰英台油田CO2驱气窜因素以及泡沫封窜技术研究"(项目编号:P11006)

摘　　要：针对制约泡沫驱矿场实施效果的泡沫稳定性较差的问题，选用一种在95℃和16000mg／L矿化度条件下起泡性能较好的表面活性剂，利用流变性实验及泡沫扫描实验，分别研究了空气和二氧化碳两种气体介质的泡沫液膜黏弹模量、液膜表面张力、起泡能力、泡沫尺寸等参数对泡沫稳定性的影响。实验结果表明：在30℃下，空气泡沫表观黏度能够达到180mPa·S；空气泡沫液膜的界面黏弹模量大大高于二氧化碳泡沫液膜的界面黏弹模量；泡沫剂浓度在0．01％～0．5％之间，空气液膜与二氧化碳液膜的表面张力不受浓度的影响．分别为29mN／m和9mN／m；在同一流速条件下，空气泡沫的起泡能力大于二氧化碳泡沫。通过泡沫尺寸分析发现．泡沫的消泡过程都是先经历气泡聚并后气泡析液，但空气泡沫的消泡过程以气泡析液为，主气泡数目变化不大，CO2泡沫的消泡过程以气泡聚并为主，气泡数目骤减。从微观层面描述了空气泡沫及二氧化碳泡沫的稳定性影响机制，并指出空气泡沫比二氧化碳泡沫更稳定。A surfactant with good foaming behavior under 95~C and salinity of 1 was applied for solving the problem of poor stability of the foam restricted the effect of the field foam flooding.The effect of viscoelastic modulus ,surface tension ,foaming ability and radius of bubbles of the foam solution on the foam stability in the air and CO2 was studied in the experiments of rheology and foam scanning.The experimental results show that apparent viscosity of the air foam may reach to 180mPa-s at 30℃;and the interfacial vis- coelastic modulus of the liquid membrane of the air foam were higher than that of the CO2 foam greatly.The surface tension of the liquid membrane of the air foam and CO2 foam will not change with the foam con- centration of 0.01% to 0.05%,and their value is 29mN/m and 9mN/m respectively.Under the same gas flow rate,foaming ability of the air foam may be better than that of CO2 foam.Analysis on the radius of bubble indicates that defoaming process of them were bubbles coalescence first and then bubbles drainage.But the defoaming process of the air foam was controlled by bubbles drainage mainly with few decreases of the bubbles and the defoaming process of CO2 foam was controlled by bubbles coalescence mainly with rapid drop of the bubble number.Influencing mechanism of the stability of the air foam and CO2 foam is described by microscopic analysis.It points out that the air foam is more stable than CO2 foam.

关 键 词：表面活性剂 空气泡沫 二氧化碳泡沫 泡沫稳定性 黏弹模量 泡沫半径 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]