탄산염암 저류층의 암체 산처리 공법에서 최적 주입률 산출을 위한 실험적 연구
An Experimental Study on the Optimum Injection Rate for Matrix Acidizing in Carbonate Reservoirs
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초록
본 연구에서는 탄산염암 저류층의 암체 산처리 공법(matrix acidizing)에서 최적 주입률 산출을 위해 산처리 코어유동실험 장치를 개발하고, 최적 주입률에 미치는 영향인자를 분석하기 위해 염산의 농도와 암석의 투과도를 달 리하여 총 4 Case의 실험을 수행하였다. 실험 결과, 암석의 투과도가 높을수록 최적 주입률은 증가하는 경향을 보였으 며, 산의 농도에 따른 최적 주입률은 모두 동일한 값을 나타냈다. 이를 통해 저류층의 투과도가 산의 농도보다 최적 주 입률에 미치는 영향이 더 큰 것으로 판단된다. 또한 각 Case의 최적 주입률에서 무차원 돌파지수(pore volume to breakthrough)를 산출한 결과, 저류층의 투과도와 주입되는 산의 농도가 높을수록 웜홀을 생성하는데 소모되는 산의 양이 감소하여 암체 산처리 공법의 효율이 우수함을 확인하였다.
Abstract
This study presents the experimental apparatus, which is able to determine the optimum injection rate for matrix acidizing in carbonate reservoirs. To investigate the influence factors on the optimum injection rate, the experiments with different concentrations of HCl and permeability of 4 cases were performed. As the results, the optimum injection rate tended to increase with the permeability of rock, but the optimum injection rates according to the acid concentration were all the same. Thus it is revealed that the permeability of reservoir has a greater effect on the optimum injection rate compared to the concentration of acid. In the pore volume to breakthrough according to the optimum injection rate of each case, when the permeability of the rock and concentration of acid increased, the amount of acid consumed to generate the wormhole decreased, therefore it is believed that the efficiency of the matrix acidizing is superb.
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