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Research Paper

Numerical Analysis of Geomechanical Behavior affected by Depressurization Conditions of Gas Hydrate Production in the Ulleung Basin, East Sea, Korea

동해 울릉분지 가스하이드레이트 생산 시 감압조건에 따른 지반 거동 전산분석

Young-Jun Moon1
,
Hyo-Jin Shin1
,
Jong-Se Lim1*
,
Won-Yil Jang1
문 영준1
,
신 효진1
,
임 종세1*
,
장 원일1
1한국해양대학교 에너지자원공학과
* Corresponding Author
28 February 2019. pp. 53-61
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Abstract

The production of gas hydrate using the depressurization method can lead to subsidence due to decreased strength and stiffness of hydrate-bearing sediments. Since subsidence could damage sea-bed facilities and production wells, it is essential to study this problem. In this study, geomechanical behaviors of hydrate-bearing sediments were predicted considering the properties of a field production test site in the Ulleung basin, East sea, Korea. For this purpose, subsidence and displacement velocity were analyzed according to the depressurization conditions. As a result, geomechanical behaviors mostly occurred in the upper hydrate-bearing sediments when the depressurization method was applied. In addition, the effect of bottom hole pressure was greater than that of depressurization rate. This study can be used as a basic data for field production tests in the Ulleung basin.

Keywords
Gas hydrate
Depressurization condition
Geomechanical behavior
Ulleung basin

가스하이드레이트 생산 시 감압법 적용은 부존층의 강도와 강성도 저하를 수반하여 지반 침하를 발생시킬 수 있다. 지반 침하는 부존층 상부 생산 시설과 생산정에 피해를 일으킬 수 있으므로 이에 대한 연구가 필수적이다. 이 연구에서는 동해 울릉분지 현장시험생산 후보지역의 물성을 반영하여 가스하이드레이트 함유 퇴적층에서의 지반 거동을 예측하고자 하였으며, 이를 위해 감압조건에 따른 침하량 및 침하속도를 분석하였다. 그 결과 감압법 적용 시 지반 거동 양상은 대부분 가스하이드레이트 퇴적층 상부지층에서 발생하였으며, 지반 거동에는 감압속도보다 공저압의 영향이 큰 것을 확인하였다. 이 연구 결과는 동해 울릉분지 현장시험생산 계획 수립 시 기초자료로 활용 가능할 것으로 사료된다.

키워드
가스하이드레이트
감압조건
지반 거동
울릉분지
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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 :1
  • Pages :53-61
  • Received Date : 2019-01-23
  • Revised Date : 2019-02-21
  • Accepted Date : 2019-02-22
  • DOI :https://doi.org/10.32390/ksmer.2019.56.1.053
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