Natural gas foam can be used for mobility control and channel blocking during natural gas injection for enhanced oil recovery, in which stable foams need to be used at high reservoir temperature, high pressure and high water salinity conditions in field applications. In this study, the performance of methane (CH₄) foams stabilized by different types of surfactants was tested using a high pressure and high temperature foam meter for surfactant screening and selection, including anionic surfactant (sodium dodecyl sulfate), non-anionic surfactant (alkyl polyglycoside), zwitterionic surfactant (dodecyl dimethyl betaine) and cationic surfactant (dodecyl trimethyl ammonium chloride), and the results show that CH₄-SDS foam has much better performance than that of the other three surfactants. The influences of gas types (CH₄, N₂, and CO₂), surfactant concentration, temperature (up to 110°C), pressure (up to 12.0 MPa), and the presence of polymers as foam stabilizer on foam performance was also evaluated using SDS surfactant. The experimental results show that the stability of CH₄ foam is better than that of CO₂ foam, while N₂ foam is the most stable, and CO₂ foam has the largest foam volume, which can be attributed to the strong interactions between CO₂ molecules with H₂O. The foaming ability and foam stability increase with the increase of the SDS concentration up to 1.0 wt% (0.035 mol/L), but a further increase of the surfactant concentration has a negative effect. The high temperature can greatly reduce the stability of CH₄-SDS foam, while the foaming ability and foam stability can be significantly enhanced at high pressure. The addition of a small amount of polyacrylamide as a foam stabilizer can significantly increase the viscosity of the bulk solution and improve the foam stability, and the higher the molecular weight of the polymer, the higher viscosity of the foam liquid film, the better foam performance.

中文翻译：

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在高压和高温条件下使用不同的表面活性剂稳定天然气泡沫

天然气泡沫可用于天然气注入过程中的流动性控制和通道阻塞以提高采收率，其中在现场应用中需要在高储层温度、高压和高水盐度条件下使用稳定的泡沫。本研究采用高压高温泡沫仪对不同类型表面活性剂稳定甲烷（CH ₄）泡沫的性能进行了表面活性剂的筛选和选择，包括阴离子表面活性剂（十二烷基硫酸钠）、非阴离子表面活性剂（烷基多​​糖苷）、两性离子表面活性剂（十二烷基二甲基甜菜碱）和阳离子表面活性剂（十二烷基三甲基氯化铵），结果表明CH ₄-SDS泡沫比其他三种表面活性剂的性能要好得多。气体类型（CH ₄、N ₂和 CO ₂）、表面活性剂浓度、温度（最高 110°C）、压力（最高 12.0 MPa）以及作为稳泡剂的聚合物的存在对泡沫性能的影响也是使用 SDS 表面活性剂进行评估。实验结果表明，CH ₄泡沫的稳定性优于CO ₂泡沫，而N ₂泡沫最稳定，CO ₂泡沫体积最大，这可归因于CO ₂之间的强相互作用。 H _2分子O. 起泡能力和泡沫稳定性随着 SDS 浓度的增加而增加至 1.0 wt% (0.035 mol/L)，但表面活性剂浓度的进一步增加有负面影响。高温会大大降低CH ₄ -SDS泡沫的稳定性，而在高压下发泡能力和泡沫稳定性会显着增强。添加少量聚丙烯酰胺作为稳泡剂，可显着增加本体溶液的粘度，提高泡沫稳定性，而且聚合物分子量越高，泡沫液膜的粘度越高，泡沫性能越好.