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탄산염암 저류층의 암체 산처리 공법 기술 특성 및 현장사례 분석

Investigation on the Technical Characteristics and Field Cases of Matrix Acidizing Treatment in Carbonate Reservoirs

이정환|유현상
한국자원공학회 (The Korean Society of Mineral and Energy Resources Engineers)|2018.04|한국자원공학회지 (Journal of the Korean Society of Mineral and Energy Resources Engineers)|제55권 제2호|pp. 147-158

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키워드

탄산염암 저류층Carbonate reservoirsMatrix acidizing암체 산처리산-암석 반응웜홀 예측 모델Acid-rock reactionWormhole forecasting model
주제분류자원공학

초록

본 연구에서는 탄산염암 저류층의 암체 산처리 공법 기술 특성 및 메커니즘을 분석하고 중동지역에서 수행 된 현장사례를 조사하였다. 분석결과, 성공적인 암체 산처리를 수행하기 위해 저류층 내 산을 주입 시 생성되는 고투 과성 통로인 웜홀(wormhole)의 길이 및 형태가 최적화되어야 하며, 이를 위해 산-암석 반응 실험을 통한 확산계수 (diffusion coefficient) 도출과 산처리 코어 유동실험을 통한 최적 주입률 선정 및 웜홀 예측 모델링이 필요한 것으로 확인되었다. 일부 현장사례에서는 저류층 내 산과 저류암의 반응 시스템 및 웜홀 예측 모델의 스케일 보정 등이 정확히 반영되지 않아 예측 결과와 비교 시 생산증진 효율이 낮은 특징을 나타내었다. 제시된 결과는 향후 탄산염암 저류층에 서 산처리 공법을 적용한 유정의 생산성 개선 프로젝트 설계를 위한 기초자료로 활용될 수 있을 것으로 기대된다.

Abstract

The technical characteristics and mechanisms of the matrix acidizing treatment in carbonate reservoirs were analyzed, and field applications for Middle East were investigated in this study. To conduct a successful matrix acidizing, the length and feature of highly conductive channels known as wormhole, which is created when acid is injected to reservoir, should be optimized. It is revealed that the calculation of diffusion coefficient by acid-rock reaction experiments, selection of the optimum injection rate by acid coreflooding experiment, and forecasting model of wormhole are required to ascertain the optimum wormhole feature. In some field cases, the reaction system of acid-reservoir rock and scaling of wormhole forecasting model were not accurately reflected, thus the efficiency of production enhancement was low compared to estimated result. It is believed that the proposed results can be utilized as basic guides for the design of well productivity improvement project in carbonate reservoirs.

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