1 College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China 2 Key Laboratory of Unconventional Oil & Gas Development, Ministry of Education, China University of Petroleum (East China), Qingdao 266580, Shandong, China
Abstract: Conventional two-phase foams have poor foam stability under high temperature environments and cannot meet the production requirements of high temperature reservoirs. In this work, modified silicon nanoparticles (NP) were used to strengthen the foam performance of sodium α-olefin sulfonate. The Waring Blender method was used to evaluate the foam performance of NP strengthened foam, the mechanism of NP enhance foam stability and the sealing ability of foam at high temperature were studied. The results show that the 0.5% AOS foam reinforced with 2.0% NP has very stable foam performance, and the foam performance is stable after high temperature heat aging treatment. Its foam stabilization mechanism is that NP can form irreversible adsorption at gas-liquid interface. Meantime, in the adsorption between NP and AOS molecules, which has a small effect on the surface tension, and effectively increases the viscosity, surface expansion elastic modulus and storage modulus of the AOS solution to delay the drainage, disproportionation and coalescence of foam. The foam has excellent plugging performance at both 1 000 mD and 3 000 mD permeability, and its resistance factor is much larger than that of AOS foam, which has the potential for high-temperature control and flooding applications.
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2023, Vol. 37 
