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《Materials Reports》 2019-06
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Preparation and Evaluation of a New Type Step-down Augmented Injection Agent Made of SiO_2 Nanoparticles

ZHAI Henglai;QI Ning;SUN Xun;ZHANG Xiangyu;FAN Jiacheng;College of Petroleum Engineering,China University of Petroleum (East China);  
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-SiO_2 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 SiO 2 nanoparticles aqueous suspension,using hydrophobic nano-SiO_2,ethanol and surfactant as raw materials,and the analysis upon its performance and action principle. The results show that the dosage of nano-SiO_2 must be less than 1% when the dosage of 1% Tween 80 is used in the preparation of nano-SiO_2 step-down augmented injection agent. The median particle size of 0. 2%-0. 6% nano-SiO_2 injection agent ranges from 300 to 400 nm.The surface tension of 0. 2%-1% nano-SiO_2 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-SiO_2 injection agent can make carbon dioxide debris reach adsorption equilibrium,which accords with the characteristic of single-layer adsorption. After treating by nano-SiO_2 step-down augmented injection agent,the hydrophilic surface of the quartz sand tablets transferred to a hydrophobic one. Moreover,0. 2%-0. 6% nano-SiO_2 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-SiO_2 step-down augmented was injected into the formation,the ethanol would volatilize with the temperature rising,nano-SiO_2 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.
【Fund】: 十三五国家科技重大专项(2017ZX005030005)~~
【CateGory Index】: TE39
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