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Research Paper

Numerical Analysis of Depressurization Rate Effects on the Gas Hydrate Dissociation Behavior in Core Scale Experimental System

감압율에 따른 코어스케일 실험시스템 내 가스하이드레이트 해리거동 전산분석 연구

Seo-Yoon Moon1
,
Hyo-Jin Shin1
,
Jong-Se Lim1*
,
Jaehyoung Lee2
문 서윤1
,
신 효진1
,
임 종세1*
,
이 재형2
1한국해양대학교 에너지자원공학과
2한국지질자원연구원 석유해저연구본부
* Corresponding Author
30 August 2019. pp. 334-343
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Abstract

A numerical analysis integrated with the production experiment is required to analyze the effect of depressurization on the production of gas hydrate(GH). In this study, a numerical simulation model considering condition of a core scale experimental system was constructed to understand the depressurization rate effect on the production trend and GH dissociation behavior. The model was validated by comparing with the experimental results and used to analyze depressurization rate. The faster GH dissociation rate as the depressurization rate is increased, which results in the earlier beginning of the production and completion of the dissociation. The pressure propagation was delayed above the specific depressurization rate. The pressure difference between the production point and the experimental system boundary was greater as the depressurization rate and GH saturation is higher. This results can be used as the basic data for establishing the field production test plan using depressurization.

Keywords
Gas hydrate
Core scale experimental system
Depressurization rate
Numerical analysis

가스하이드레이트 개발 시 감압법 적용에 따른 생산효과 분석을 위해 생산모사 실험과 전산수치 해석을 연계한 연구가 필요하다. 이 연구에서는 생산경향과 가스하이드레이트 해리거동에 대한 감압율의 영향을 파악하고자 코어스케일 실험시스템의 조건을 반영한 전산수치 모델을 구축하였다. 실험결과와의 비교로 검증한 전산수치 모델을 활용하여 감압율의 영향을 분석하였다. 그 결과 감압율이 클수록 가스하이드레이트 해리 속도가 빨라져 생산 시작 및 해리 완료 시점이 앞당겨졌다. 또한 특정 감압율 이상에서는 압력 전파가 지연되었다. 감압율 및 가스하이드레이트포화율이 클수록 생산지점과 실험시스템 경계에서의 압력차이가 증가함을 파악하였다. 이 연구 결과는 감압법을 적용한 현장 시험생산 계획 수립에 기초자료로 활용 가능할 것이다.

키워드
가스하이드레이트
코어스케일 실험시스템
감압율
전산수치 해석
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 56
  • No :4
  • Pages :334-343
  • Received Date : 2019-06-04
  • Revised Date : 2019-07-26
  • Accepted Date : 2019-08-23
  • DOI :https://doi.org/10.32390/ksmer.2019.56.4.334
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