탄산염암의 암체 산처리 공법을 위한 유화산 제조 및 안정성 평가에 관한 연구
A Study on the Preparation and Stability of Emulsified Acid for Carbonate Matrix Acidizing
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초록
본 연구에서는 탄산염암의 암체 산처리 공법을 위해 유화산을 제조하고 안정성 평가 연구를 수행하였다. 상온과 고온에서 안정성을 확보한 W/O (water-in-oil) 에멀젼(emulsion)을 제조하기 위해 양이온성 유화제와 비이온성 유화제를 친수성-친유성 균형(hydrophile-lipophile balance, HLB) 기준으로 혼합하여 사용하였고, 안정성을 평가하기 위해 액적 시험(droplet test)과 상분리 시험(separation test)을 수행하였다. 유화산 제조 결과, 상온과 고온(90°C)에서 상분리가 일어나지 않는 유체 안정성을 가진 W/O 에멀젼을 확보하였으며, 이때 양이온성 유화제와 비이온성 유화제를 단독으로 사용하는 것 보다 두 유화제를 혼합하여 사용하였을 때 안정성 측면에서 우수함을 확인하였다. 실험을 통해 도출한 결과는 향후 탄산염암 저류층 현장에서 유화산 제조 가이드라인을 제공할 수 있을 것으로 기대된다.
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.
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