Prediction model of bottom hole temperature and pressure at deep injector for CO2 sequestration to recover injection rate

Kyuro Sasaki, Tetsu Yasunami, Yuichi Sugaia

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5 Citations (Scopus)


The field test of CO2-ECBM was carried during 2003 to 2007 in order to evaluate technical feasibility of injecting CO2 into the coal seam while producing CH4 at Yubari City, Hokkaido, Japan. It aims to resolve global warming and to develop a system for injection and sequestration of CO2 into coal seams. The targeted coal seam is located about 900 m below the surface. The absolute pressure at the bottom hole is approximately 15.5 MPa and the CO2 temperature is about 28 {ring operator}C before the injecting into the coal seam. Thus, CO2 is injected in liquid phase to the coal seam and supercritical condition of CO2 has not been satisfied due to heat loss along the deep injection well. Replacements of usual tubing pipes with thermal insulated tubings were applied, however the temperature at the bottom hole was still lower than the CO2 critical temperature. The project had a problem about decreasing injection rate after starting injection CO2. It was evaluated by analysing the field test data that the maximu m decreasing ratio of the coal seam permeability was 0.065 and permeability around injection well was became 6 times larger than the original one. We assumed that its reason is caused with swelling of the coal seam around the injection well by liquid CO2 injection. Present study has focused on the keeping supercritical CO2 in the tubing because viscosity of supercritical CO2 that is 40% smaller than that of liquid CO2. The CO2 temperature has been successfully predicted in order to keep CO2 in supercritical condition from the surface to the bottom for various CO2 injection rates and electric heater power. The minimum injection rate has been presented in order to keep CO2 in the supercritical condition at the bottom hole of the injection tubing. Injected CO2 is expected to be super critical over 12 ton/day of injection rate without any heating in the tubing.

Original languageEnglish
Pages (from-to)2999-3006
Number of pages8
JournalEnergy Procedia
Issue number1
Publication statusPublished - Feb 2009
Event9th International Conference on Greenhouse Gas Control Technologies, GHGT-9 - Washington DC, United States
Duration: Nov 16 2008Nov 20 2008

All Science Journal Classification (ASJC) codes

  • Energy(all)
  • Global and Planetary Change
  • Earth and Planetary Sciences(all)


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