CO2 주입 시 오일의 점성도에 따른 회수율에 대한 실험적 고찰
Experimental Observation of Varying Oil Viscosity on Oil Recovery by CO2 Injection
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초록
본 연구에서는 WAG 공법을 이용하여 혼합 공정 조건과 비혼합 공정 조건에서 각각 점성도가 다른 두 원유의 회수율 차이를 확인하였다. 비교적 점성도가 높은 원유로는 VGH, 점성도가 낮은 원유로는 KWT 원유를 사용하였다. 혼합 공정과 비혼합 공정의 압력조건을 설정하기 위해 슬림튜브 장치를 이용하여 MMP를 측정하였고 VGH 원유가 KWT 원유보다 CO2와의 혼합 압력이 더 높은 것으로 나타났다. WAG 공법 적용 시, KWT 원유가 VGH 원유보다 회수율이 높게 확인되었고 혼합 공정이 비혼합 공정보다 높은 오일 회수율을 나타냈다. 코어 내 CO2 잔류 포화도는 KWT 원유에 적용한 혼합 WAG 공법에서 가장 높게 나타났다. 오일 회수율이 가장 낮게 나타났던 VGH 원유에 대한 비혼합 WAG 공법의 회수율을 높이기 위해 CO2의 주입유량을 매 주입주기마다 올려준 결과, 1:1 슬러그 비율의 전형적인 비혼합 WAG 공법보다 높은 오일 회수율과 CO2 주입효율이 나타났다.
Abstract
This study presents to evaluate oil recovery related to two kinds of crude oil which have different viscosities by miscible and immiscible WAG. VGH was used as relatively heavy oil and KWT was used as lighter oil. To estimate the pressure conditions for miscible and immiscible processes, MMP was measured by slim-tube apparatus. It showed that VGH needed higher MMP than KWT. In WAG, KWT showed higher than VGH and Miscible processes were more effective than immiscible in oil recovery, respectively. The residual CO2 saturation in the core was the highest in miscible WAG with KWT than any other processes. To improve the efficiency of immiscible WAG with VGH that showed the lowest oil recovery, CO2 injection rate was increased at each injection cycle. As a result, it showed higher oil recovery and injection efficiency than conventional immiscible WAG.
참고문헌 (15)
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