【摘要】：為了降低泡沫壓裂液對(duì)地層濾失,實(shí)現(xiàn)高效壓裂作業(yè),針對(duì)納米顆粒與黏彈性表面活性劑穩(wěn)定的新型泡沫體系濾失性展開研究,研制了氣體擴(kuò)散測(cè)定裝置,并結(jié)合激光共聚焦、低溫冷凍透射、界面流變等實(shí)驗(yàn)手段,分析了影響濾失的泡沫物性:微觀結(jié)構(gòu)、黏度、穩(wěn)定性、液膜強(qiáng)度。在此基礎(chǔ)上,研究了泡沫質(zhì)量、滲透率、濾失壓差等因素對(duì)新型泡沫濾失性的影響,并分析了泡沫濾失后的巖心傷害。結(jié)果表明:SiO_2/VET/SDBS泡沫液膜上吸附著納米顆粒,形成了"顆�？�",其泡沫液相中形成了明顯的蠕蟲狀膠束,這2類微觀構(gòu)象提高了泡沫的表觀黏度;SiO_2/VET/SDBS泡沫的表現(xiàn)出良好的抗析液能力及抗氣泡聚并能力,泡沫中氣泡液膜的強(qiáng)度也相對(duì)較高;在泡沫質(zhì)量分?jǐn)?shù)為10%~90%時(shí),SiO_2/VET/SDBS泡沫的氣、液濾失均得良好的抑制,尤其在泡沫質(zhì)量分?jǐn)?shù)為50%以上時(shí),泡沫的的氣體濾失系數(shù)隨著泡沫質(zhì)量分?jǐn)?shù)升高出現(xiàn)了緩慢增大,甚至部分減小的趨勢(shì)。在巖心滲透率為0.2~20mD,濾失壓差為0.2~12 MPa時(shí),SiO_2/VET/SDBS泡沫可以有效抑制氣、液濾失;巖心傷害實(shí)驗(yàn)表明SiO_2納米顆粒的加入沒(méi)有引起巖心滲透率的明顯損失。可以得出,納米顆粒與黏彈性表面活性劑穩(wěn)定的新型泡沫體系具有低濾失性和低地層傷害的特點(diǎn)。
[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.
【作者單位】： 中國(guó)石油大學(xué)(華東)石油工程學(xué)院;
【基金】：高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金資助項(xiàng)目(20120133110008) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51274228) 中國(guó)石油大學(xué)(華東)自主創(chuàng)新科研計(jì)劃項(xiàng)目(15CX06023A)
【分類號(hào)】：TE357.12

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