탄산염암 저류층에서 유화산을 이용한 산처리 공법 기술 특성 및 현장사례 분석
Investigation on the Technical Characteristics and Field Cases of Matrix Acidizing Treatment Using Emulsified Acid in Carbonate Reservoirs
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초록
본 연구에서는 탄산염암 저류층의 유화산 산처리 공법 기술 특성 및 메커니즘을 조사하고 공법이수행된 현장사례를 분석하였다. 조사 결과, 성공적인 유화산 산처리 공법을 수행하기 위해서는 안정성 평가(stability test)를 통해 상온에서 24시간 이상, 고온에서 4시간 이상 안정성을 확보한 W/O (water-in-oil) 유화산이 제조되어야 하며, 회전식 디스크 실험 및 산처리 코어유동 실험을 통한 최적주입조건이 설계되어야 한다. 현장사례의 경우, 다층(multi-layered) 또는 불균질한 탄산염암 저류층에서 산처리 공법 수행 시 염산보다 유화산을 사용하였을 때 산과 암석의 반응을 지연시켜 효율적인 웜홀을 형성하였고, 저류층의 투과도를 전반적으로 개선하는데 용이함을 보였다. 제시된 결과는 향후 탄산염암 저류층에서 유화산 산처리 공법을 적용한 유정의 생산성 개선 프로젝트 설계를 위한 기초자료로 활용될 수 있을 것으로 기대된다.
Abstract
In this study, the technical characteristics and mechanisms of matrix acidizing treatments in carbonate reservoirs using emulsified acid were analyzed, and field applications were investigated. As the results, stable W/O (water-in-oil) emulsified acid, which is stable at room temperatures for 24 hours and at high temperatures for 4 hours, should be prepared, also the optimum injection rate through a rotating disk apparatus test and core-flood test would be designed to conduct a successful acid treatment. In the field cases of multi-layered or heterogeneous carbonate reservoirs, the emulsified acid generated effective wormholes retarding the reaction between the acid and rock, and improved the overall permeability of the reservoir in comparison with HCl. Therefore, the proposed results can be utilized as a basic guideline for the design of matrix acidizing using emulsified acid in carbonate reservoirs.
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