A Study on the Preparation and Stability of Emulsified Acid for Carbonate Matrix Acidizing

Abstract

This study presents the preparation and stability of emulsified acid for carbonate matrix acidizing. Cationic and nonionic emulsifiers were mixed using hydrophile-lipophile balance (HLB) values to prepare water-in-oil emulsion stable at room temperature and high temperature, and droplet and separation tests were carried out to evaluate the fluid stability. As the result, W/O emulsion with fluid stability that did not cause phase separation at room and the high temperature (90°C) was ensured. Furthermore, it was confirmed that the use of two emulsifiers resulted in superior outcomes compared to using cationic emulsifiers or nonionic emulsifiers individually. Therefore, the proposed results can be utilized as guidelines for the preparation of emulsified acids in carbonate reservoirs.

Synthesis and Dispersion Stability Assessment of a Silica Nanofluid for Improving CO2 Geological Storage Efficiency

“…TEM과 같은 전자현미경은 나노입자의 형상을 분 석하는 가장 대표적인 방법이므로 이를 진행하여 나노유체 의 분산안정성을 평가하였다 (Bae et al, 2009). FMT는 본 래 유화산(emulsified acid)의 형태를 판단하기 위한 시험 법인 액적 시험법(droplet test)을 변형시킨 분석법이다 (Song and Lee, 2021). 액적 시험법의 원리를 적용하여 합 성한 나노유체가 대상저장지층에 주입되었을 때, 저장지 층 환경의 고염과 접촉 시 분산안정성 유지 여부를 확인하 기 위해 제안되었다.…”