纳米聚硅材料对黏土膨胀性的影响(英文)

EFFECT OF NANOMETER POLYSILICON MATERIAL ON CLAY SWELLING

利用透射电镜观察了纳米聚硅材料的微观结构,测量了添加不同浓度纳米聚硅材料柴油的黏度,采用页岩膨胀仪评价了黏土矿物在蒸馏水、柴油和纳米聚硅材料-柴油溶液中的膨胀性。研究表明:纳米聚硅材料的粒度小于100nm,具有憎水性;添加纳米聚硅材料后柴油的黏度略有增加,而且随纳米聚硅材料浓度的增加,体系黏度增大。黏土矿物在纳米聚硅材料-柴油溶液中的膨胀率比在蒸馏水中的降低90%以上。随纳米聚硅材料浓度的增加,黏土矿物的膨胀率降低。黏土矿物在纳米聚硅材料-柴油中的膨胀率比在柴油中的小。膨胀后的黏土矿物浸入纳米聚硅材料-柴油溶液后,收缩率为2.9%,说明纳米聚硅材料-柴油溶液对黏土矿物的膨胀有一定的抑制作用,这对解释低渗透油藏纳米聚硅材料-柴油溶液降压增注机理具有重要意义。

Microstructure of nanometer polysilicon material （NMPM） was observed by a transmission electron microscope （TEM）. The viscosities of diesel oil at different NMPM concentrations were measured. The swelling properties of clay in distilled water, diesel oil and diesel oil at different NMPM concentration were evaluated by using a shale swelling meter. Experiments show that the size of the NMPM is less than 100 nm and the NMPM is hydrophobic. The viscosity of diesel oil with NMPM addition is higher than that of diesel oil, and the higher the NMPM concentration, the higher the viscosity. Compared with the clay swelling rate in distilled water, the clay swelling rate in NMPM-diesel oil decreases more than 90%. With the increase of the NMPM concentration in diesel oil, the clay swelling rate decreases. The clay swelling rate in NMPM-diesel oil solution is lower than that in diesel oil. The NMPM-diesel oil treatment can make the swelled clay shrink by 2.9%. It is proved that the NMPM-diesel oil treatment can restrain the clay swelling and these results are very important for the explanation of the mechanisms for depressurizing and augmented injection in low permeability reservoirs.