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Scenario Analysis of Injection Temperature and Injection Rate for Assessing the Geomechanical Stability of CCS (Carbon Capture and Sequestration) System

이산화탄소 격리저장시스템의 역학적 안정성 평가를 위한 주입온도 및 주입량 시나리오 해석

Kim, A-Ram;Kim, Hyung-Mok
김아람;김형목

  • Received : 2015.12.24
  • Accepted : 2016.01.08
  • Published : 2016.02.29

Abstract

For a successful accomplishment of Carbon Capture Sequestration (CCS) projects, appropriate injection conditions should be designed and optimized for site specific geological conditions. In this study, we evaluated the effect of injection conditions such as injection temperature and injection rate on the geomechanical stability of CCS system in terms of TOUGH-FLAC simulator, which is one of the well-known T-H-M coupled analysis methods. The stability of the storage system was assessed by a shear slip potential of the pre-existing fractures both in a reservoir and caprock, expressed by mobilized friction angle and Mohr stress circle. We demonstrated that no tensile fracturing was induced even in the cold CO2 injection, where the injected CO2 temperature is much lower than that of the reservoir and tensile thermal stress is generated, but shear slip of the fractures in the reservoir may occur. We also conducted a scenario analysis by varying injected CO2 volume per unit time, and found out that it was when the injection rate was decreasing in a step-wise that showed the least potential of a shear slip.

Keywords

CCS (Carbon Capture and Sequestration);TOUGH-FLAC;Shear slip potential;Scenario analysis;Injection temperature;Injection rate

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Cited by

  1. Numerical Analysis for Fault Reactivation during Gas Hydrate Production vol.26, pp.2, 2016, https://doi.org/10.7474/TUS.2016.26.2.059

Acknowledgement

Supported by : 한국연구재단, 한국에너지기술평가원(KETEP)