Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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A Study on Alumina Nanoparticle Dispersion for Improving Injectivity and Storativity of CO2 in Depleted Gas Reservoirs

고갈 가스전에서 CO2 주입성 및 저장성 향상을 위한 알루미나 나노입자의 분산 특성 연구

  • Seonghak Cho (Department of Engery and Resources Engineering, Chonnam National University) ;
  • Chayoung Song (Department of Engery and Resources Engineering, Chonnam National University) ;
  • Jeonghwan Lee (Department of Engery and Resources Engineering, Chonnam National University)
  • 조성학 (전남대학교 에너지자원공학과) ;
  • 송차영 (전남대학교 에너지자원공학과) ;
  • 이정환 (전남대학교 에너지자원공학과)
  • Received : 2022.12.06
  • Accepted : 2022.12.30
  • Published : 2023.03.31
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Abstract

In this study, the Al2O3 nanofluid was synthesized as an additive for improving the injection efficiency and storage capacity of carbon dioxide (CO2) in a depleted sandstone reservoir or deep saline aquifer. As the base fluid, deionized water (DIW) and saline prepared by referring to the composition of API Brine were used, and the fluid was synthesized by using Al2O3 nanofluid with CTAB (cetyltrimethyl-ammonium bromide), a cationic surfactant. After that, the dispersion stability was evaluated by using visual observation, dynamic light scattering (DLS), transmission electron microscope (TEM), and miscibility test. As a result, it was presented that stable nanofluid without agglomeration and precipitation after reaction with 70,000 ppm of brine could be synthesized when the nanoparticle concentration was 0.05 wt% or less.

본 연구에서는 고갈된 가스전의 사암 저류층 또는 심부 대염수층 내 이산화탄소(CO2) 주입효율 및 저장용량 증진을 위한 주입 첨가제로써 Al2O3 나노유체를 합성하였다. 기반 유체로 탈이온수(deionized water, DIW)와 API Brine의 조성을 참고하여 제조한 염수를 사용하였으며, 양이온성 계면활성제인 CTAB (cetyltrimethyl-ammonium bromide)을 첨가한 Al2O3 나노유체를 이용하여 유체를 합성하였다. 육안관찰, 동적광산란광도계(dynamic light scattering, DLS), 전자투과현미경(transmission electron microscope, TEM), 혼화성 시험(miscibility test)의 방법을 활용한 유체의 분산 안정성 평가 결과, 나노입자 농도가 0.05 wt% 이하 조건에서 70,000 ppm의 염수와 반응 후에도 응집 및 침전되지 않는 안정한 유체를 합성할 수 있음을 확인하였다.

Keywords

Acknowledgement

본 연구는 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다(과제번호 20212010200010). 또한, 본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었습니다(과제번호 RS2022-00143541). 또한, 본 연구는 정부(교육부, 산업통상자원부)의 재원으로 K-CCUS 추진단의 지원을 받아 수행된 연구입니다.(KCCUS 20220001, 온실가스감축혁신인재양성사업)

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