Drilling and Completion of CO2 Injection Well in the Offshore Pohang Basin,  Yeongil Bay

Kyoung-Sik Won; Dae-Sung Lee; Sang-Jun Kim; Seong-Do Choi

doi:10.9720/kseg.2018.2.193

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2018 Vol.28, Issue 2 Preview Page Next Page

Research Article

Drilling and Completion of CO₂ Injection Well in the Offshore Pohang Basin, Yeongil Bay 포항분지 해상 CO₂ 주입정 시추 완결 및 구축

30 June 2018. pp. 193-206

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Abstract

In this study, as part of the “Small-scale CO₂ Injection-Demonstration Project in Offshore Pohang Basin”, we performed drilling and completion of a CO₂ injection well from the offshore platform installed in the Yeongil Bay, Pohang city, Gyeongsang buk-do. The drilling of injection well was carried out from an offshore platform installing on the sediment formations of the Pohang Basin. Drilling diameters were reduced by stages, depending on the formation pressure and groundwater pressure along a depth and the casing installation and cement grouting in drilled hole were performed at each stage. The injection well was drilled to a final depth of 816.5 m with a hole diameter of 4 7/8 inches (Φ124 mm) and the perforated casing for an injection section was installed in a depth of 746.5~816.5 m. Injection tubing, packer, and christmas tree were installed for the completion of an injection well for CO₂. The validation project of the CO₂ injection was accomplished successfully by drilling the injection well and installing the injection facilities, and through the suitable CO₂ injection process. The current injection facility is a facility for small-scale injection demonstration of 100 tons. In the case of large-scale demonstration facility test of a capacity of 10,000 tons, research is underway through the upgrading of the injection facilities.

Keywords

geological storage

injection well

injection-demonstration

CO₂

offshore platform

본 연구는 “포항분지 해상 소규모 CO₂ 주입실증 프로젝트”의 일환으로 경상북도 포항시 영일만에 설치된 해상 플랫폼에서 CO₂ 주입 실증을 위한 주입정 시추 및 완결(well drilling and completion)을 수행하였다. 주입정 시추(well drilling)는 포항분지 해상지역 퇴적지층에 설치한 해상플랫폼의 상부부터 해저면까지 케이싱 설치를 시작으로 단계별로 굴진 공경을 축소하면서 케이싱 설치 및 시멘트 그라우팅(cement grouting)을 시행하며 진행하였다. 최종심도 816.5 m 까지 공경 4 7/8 inch (Φ124 mm) 규격으로 굴진하여 심도 746.5∼816.5 m 구간에 유공 케이싱을 설치하여 주입구간을 형성하였다. CO₂ 주입을 위한 주입공 완결(well completion)을 위하여 주입관, 패커(packer), 주입탑(christmas tree)을 설치하였다. 주입공을 완결하고 주입 플랜트 설비를 설치하여 CO₂ 시험 주입을 성공적으로 수행하였다. 현재의 주입설비는 100톤 규모의 소규모 주입 실증을 위한 설비로서 향후 주입설비 격상을 통하여 총 1만톤의 중규모 실증 주입설비로 추가적인 연구개발을 진행하고 있다.

키워드

지중 저장

주입정

주입 실증

이산화탄소

해상 플랫폼

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Information

Publisher :Korean Society of Engineering Geology
Publisher(Ko) :대한지질공학회
Journal Title :The Journal of Engineering Geology
Journal Title(Ko) :지질공학
Volume : 28
No :2
Pages :193-206
Received Date : 2018-05-11
Revised Date : 2018-06-13
Accepted Date : 2018-06-18
DOI :https://doi.org/10.9720/kseg.2018.2.193

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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