一种新型纳米SiO<sub>2</sub>降压增注剂的制备与评价

doi:10.11896/cldb.201906012

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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.

Key words： low permeability and dense reservoir step-down augmented injection SiO₂ nanoparticles agglomerated particle size surface and interface tension wettability nano-film

Published: 03 April 2019

CLC number:	TE358+.3
	TE39

Fund:This work was financially supported by the National Key Technologies Research and Development Program of China during the 13th Five-Year Plan Period (2017ZX005030005).

About author:: Henglai Zhai is a master of Oil and Gas field Development Engineering (2015-2017). Ning Qi received his Ph.D. degree in China University of Petroleum (East China), He is an associate professor and master's supervisor, and mainly engages in sand control, acidification, profile control and water plugging, and other research directions, with the characte-ristics of fiber composite sand control, self-steering acidification, high temperature and high salinity plugging, low permeability plugging and so on.

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	ZHAI Henglai
	QI Ning
	SUN Xun
	ZHANG Xiangyu
	FAN Jiacheng

Cite this article:

ZHAI Henglai,QI Ning,SUN Xun, et al. Preparation and Evaluation of a New Type Step-down Augmented Injection Agent Made of SiO₂ Nanoparticles[J]. Materials Reports, 2019, 33(6): 975-979.

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http://www.mater-rep.com/EN/10.11896/cldb.201906012 OR http://www.mater-rep.com/EN/Y2019/V33/I6/975

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