석유회수증진용 폴리머 용액의 농도와 염도에 따른 완화시간과 온도 관계 분석
Analysis of Relationship between Temperature and Relaxation Time of Polymer Solution depending on Polymer Concentration and Salinity for Enhanced Oil Recovery
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초록
폴리머 주입법은 점도가 높은 폴리머 용액을 저류층에 주입해 유동도를 제어함으로써 석유회수를 증진시키 는 방법으로 석유회수증진용 폴리머 용액의 점탄성은 저류층 내부에 남아있는 석유의 치환효율을 향상시켜 석유 회 수에 기여한다. 저류층의 온도에 따라 폴리머 용액의 점탄성이 달라지기 때문에 이를 고려한 폴리머 주입법 설계가 필요하며 폴리머 용액의 점탄성을 정량화하는 주요 요소로 완화시간이 사용되고 있다. 이 연구에서는 레오미터로 폴 리머 용액의 동적 탄성률을 측정하고 교차점 기법을 이용해 완화시간을 결정하였으며 다양한 폴리머 농도, 염도 (NaCl) 조건에서 온도에 따른 완화시간 변화를 측정하였다. 그 결과 완화시간은 폴리머 농도와 양의 상관관계를 보였 으며, 염도 및 온도와는 음의 상관관계를 보였다. 또한, WLF 모델을 이용해 온도에 따른 폴리머 용액의 완화시간 추정 관계식을 제안하였다.
Abstract
Polymer flood which is one of enhanced oil recovery technology has been used for mobility control by injecting viscous polymer solution into the reservoir. Viscoelasticity of polymer solution contributes to increase in displacement efficiency of remaining oil. Since viscoelastic properties are affected by temperature, it is necessary to consider relationship between temperature and viscoelasticity for designing the polymer flood. Relaxation time is used as a major parameter to quantify the viscoelasticity of the polymer solution. In this paper, dynamic moduluses were measured using rheometer and relaxation time was determined using cross-over point method. Relaxation time showed positive correlation with polymer concentration and negative correlations with salinity (NaCl) and temperature. In addition, a correlation for estimation of relaxation time depending on temperature was suggested using WLF (WilliamLandel-Ferry) model.
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