Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Study of Drilling Technology and Field Cases for Preventing A Lost Circulation in Fractured Reservoirs

균열저류층에서 이수손실방지를 위한 시추기술 및 현장사례 연구

  • Kim, Hyun Tae (Korea Institute of Energy Technology Evaluation and Planning) ;
  • Hong, Si Chan (Dept. of Petroleum engineering, University of Science and Technology) ;
  • Yoon, Jae Pil (Dept. of Petroleum engineering, University of Science and Technology) ;
  • Park, Yong Chan (Korea Institute of Geoscience and Mineral Resources)
  • Received : 2015.08.27
  • Accepted : 2016.02.19
  • Published : 2016.02.28
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Abstract

The ratio of fractured reservoir is very high in oil & gas fields around the world. The demand of drilling technology for fractured reservoir is expected to increase continuously if oil and gas prices are economical. The purpose of the review study is to help operator or driller in selecting of proper drilling technology for preventing a lost circulation in the fractured formation. In order to achieve this goal, fractured reservoir(formation) they are classified into partial lost circulation formation and total lost circulation formation. In case of partial lost circulation formation, the drilling problem can be solved by using LCM(lost circulation material) mud additive and squeezing cement. For shallow depth, total lost circulation formation can be drilled safely and economically with casing drilling method. Also, for deeper depth, problems of total lost circulation in formation can be solved by applying mud cap, which is one of the drilling methods. This was confirmed through field application such as Italy's Medusa-1 field and Qatar's North field.

전 세계적 유 가스전에서 균열저류층의 비율은 매우 높다. 따라서 경제적인 유가가 뒷받침 될 경우 균열저류층에 대한 시추기술 수요는 계속 증가될 전망이다. 이 해설논문의 목적은 균열저류층에서 이수손실을 방지하는데 적합한 시추기술 선정에 도움을 주기 위한 것이다. 이러한 목적을 달성하기 위해 균열저류층을 이수손실의 규모에 따라 부분 이수손실지층과 전체이수손실지층으로 재분류하였다. 부분이수손실지층의 시추 시에는 이수 첨가물인 이수손실방지제와 시멘트 스퀴징 방법이 유용하며, 전체이수손실지층에서는 천부의 경우 케이싱시추방법이, 심부의 경우 이수캡시추 기법이 이수손실을 방지하는데 유용한 시추방법인 것을 알 수 있었다. 이러한 결과는 이탈리아 Medusa-1과 카타르의 North field 현장사례를 통해서도 확인할 수 있었다.

Keywords

References

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