纳米颗粒与黏弹性表面活性剂稳定的泡沫体系滤失性实验研究

发布时间：2018-10-19 17:32

【摘要】：为了降低泡沫压裂液对地层滤失,实现高效压裂作业,针对纳米颗粒与黏弹性表面活性剂稳定的新型泡沫体系滤失性展开研究,研制了气体扩散测定装置,并结合激光共聚焦、低温冷冻透射、界面流变等实验手段,分析了影响滤失的泡沫物性:微观结构、黏度、稳定性、液膜强度。在此基础上,研究了泡沫质量、渗透率、滤失压差等因素对新型泡沫滤失性的影响,并分析了泡沫滤失后的岩心伤害。结果表明:SiO_2/VET/SDBS泡沫液膜上吸附着纳米颗粒,形成了"颗粒盔甲",其泡沫液相中形成了明显的蠕虫状胶束,这2类微观构象提高了泡沫的表观黏度;SiO_2/VET/SDBS泡沫的表现出良好的抗析液能力及抗气泡聚并能力,泡沫中气泡液膜的强度也相对较高;在泡沫质量分数为10%~90%时,SiO_2/VET/SDBS泡沫的气、液滤失均得良好的抑制,尤其在泡沫质量分数为50%以上时,泡沫的的气体滤失系数随着泡沫质量分数升高出现了缓慢增大,甚至部分减小的趋势。在岩心渗透率为0.2~20mD,滤失压差为0.2~12 MPa时,SiO_2/VET/SDBS泡沫可以有效抑制气、液滤失;岩心伤害实验表明SiO_2纳米颗粒的加入没有引起岩心渗透率的明显损失。可以得出,纳米颗粒与黏弹性表面活性剂稳定的新型泡沫体系具有低滤失性和低地层伤害的特点。
[Abstract]:In order to reduce formation filtration of foam fracturing fluid and realize high efficiency fracturing operation, a new type of foam system with the stability of nanoparticles and viscoelastic surfactants was studied. A gas diffusion measuring device was developed and combined with confocal laser. By means of cryopreservation transmission and interfacial rheology, the properties of foam, such as microstructure, viscosity, stability and liquid membrane strength, were analyzed. On this basis, the effects of foam quality, permeability and filtration pressure difference on the filtration properties of the new foam are studied, and the core damage after foam filtration is analyzed. The results showed that nanoparticles were adsorbed on the SiO_2/VET/SDBS foam film, forming "particle armor", and the wormlike micelles formed in the foam liquid phase. These two kinds of microconformation improved the apparent viscosity of the foam, the SiO_2/VET/SDBS foam showed a good ability to resist liquid evolution and anti-bubble aggregation, and the strength of the bubble liquid film in the foam was relatively high, and when the foam mass fraction was 10 ~ 90%, the gas of the SiO_2/VET/SDBS foam was obtained. Especially when the foam mass fraction is more than 50%, the gas filtration coefficient of the foam increases slowly with the increase of the foam mass fraction, and even decreases in part. When the core permeability is 0.2mDand the filtration pressure difference is 0.2mD, the SiO_2/VET/SDBS foam can effectively inhibit gas and liquid filtration, and the core damage experiment shows that the addition of SiO_2 nanoparticles does not cause the loss of core permeability. It can be concluded that the new foam system with the stability of nanoparticles and viscoelastic surfactants has the characteristics of low filtration and low formation damage.
【作者单位】：中国石油大学(华东)石油工程学院;
【基金】：高等学校博士学科点专项科研基金资助项目(20120133110008) 国家自然科学基金资助项目(51274228) 中国石油大学(华东)自主创新科研计划项目(15CX06023A)
【分类号】：TE357.12

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