Abstract: Nanomaterial step-down augmented injection technology takes hydrophobic and lipophilic nanoparticles as a profile control agent, which can effectively solve the problem of high pressure and low injection caused by long-term waterflooding development in low permeability and dense reservoir. However, the conventional nano-SiO2 injection agents used in this technology currently are expensive, difficult to access, and complex in preparation process. This contribution presents the preparation of a new type step-down augmented injection agent made of SiO2 nanoparticles aqueous suspension, using hydrophobic nano-SiO2, ethanol and surfactant as raw materials, and the analysis upon its performance and action principle. The results show that the dosage of nano-SiO2 must be less than 1% when the dosage of 1% Tween 80 is used in the preparation of nano-SiO2 step-down augmented injection agent. The median particle size of 0.2%－0.6% nano-SiO2 injection agent ranges from 300 to 400 nm. The surface tension of 0.2%－1% nano-SiO2 injection agent is within 34－37 mN/m and the interface tension is within 1.9－4.0 mN/m. 0.6% of the prepared nano-SiO2 injection agent can make carbon dioxide debris reach adsorption equilibrium, which accords with the characteristic of single-layer adsorption. After treating by nano-SiO2 step-down augmented injection agent, the hydrophilic surface of the quartz sand tablets transferred to a hydrophobic one. Moreover, 0.2%－0.6% nano-SiO2 step-down augmented injection agent added to the rock samples could achieve smaller inlet pressure, larger displacement flow, and a permeability increment of about 25%－49%. When the nano-SiO2 step-down augmented was injected into the formation, the ethanol would volatilize with the temperature rising, nano-SiO2 particles could be released and be adsorbed onto the rock surfaces of the rock to form nano-film. In consequence, it could exert the role of reducing the pressure and enhancing the flow.
翟恒来, 齐宁, 孙逊, 张翔宇, 樊家铖. 一种新型纳米SiO2降压增注剂的制备与评价[J]. 材料导报, 2019, 33(6): 975-979.
ZHAI Henglai, QI Ning, SUN Xun, ZHANG Xiangyu, FAN Jiacheng. Preparation and Evaluation of a New Type Step-down Augmented Injection Agent Made of SiO2 Nanoparticles. Materials Reports, 2019, 33(6): 975-979.
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2019, Vol. 33 
