해수 기반의 나노-스마트 유체 합성 및 분산 안정성 평가
Synthesis and Dispersion Stability Test of Seawater-based Nano-Smart Fluids
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초록
본 연구에서는 탄산염암 저류층에서 오일 생산을 극대화하기 위해 전위결정이온(potential determining ion, PDI)을 조절한 해수에 표면개질(surface modification)한 나노입자를 첨가하여 고온·고염의 저류층에서 활용 가능한 기능성 나노입자 기반 스마트 유체(smart fluid)를 합성하였다. 또한 합성된 유체의 분산 안전성을 평가하기 위해 상변화 관찰 및 입도분석 특성을 분석하였다. 유체 합성에 있어 Persian Gulf 지역의 해수 조성을 참고하여 해수를 제조하였으며, 해수에 PDI인 K+, Mg2+, SO42–를 첨가한 스마트 워터(smart water)에 0.05~3 wt%의 표면개질한 SiO2나노입자를 분산시켰다. 상변화 관찰 및 입도분석기를 통한 안정성 평가 결과, 나노입자 농도가 0.5 wt% 이상일 때해수 염도 범위에서 또한 상온 및 80°C의 고온 조건에서 응집 및 침전되지 않는 안정한 유체를 합성할 수 있음을 확인하였다.
Abstract
In this study, nano-smart fluids available in high-temperature and high-salinity reservoirs were synthesized with surface-modified nanoparticles and potential determining ion(PDI)-controlled seawater to maximize oil production in carbonate reservoirs. Phase behavior observation and particle size analysis were also carried out to evaluate the dispersion stability of synthesized nano-smart fluids. Seawater was prepared based on the seawater composition of the Persian Gulf region and PDIs(K+, Mg2+, and SO42–) were added to the seawater. In addition, 0.05-3 wt% of surface-modified SiO2 nanoparticles were dispersed in the smart water prepared as aforementioned. As a result of the dispersion stability test, it was confirmed that stable fluids without agglomeration and precipitation could be synthesized at the condition with room temperature of 25°C and high temperature of 80°C as well as in the salinity range of seawater when the nanoparticle concentration was 0.5 wt% or more.
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