重質油層のCO2-EOR および貯留にかかわるガス溶解量

Translated title of the contribution: CO2 solubility of heavy oil related to CO2 EOR and storage

Kyuro Sasaki, Yuichi Sugai, Hiroyuki Kono, Takashi Takahashi, Daisuke Ito, Takashi Okabe

Research output: Contribution to journalArticle

Abstract

In this lecture, a cold drainage mechanism of heavy oil from sandstone cores has been presented by using immiscible CO2 gas dissolution into the oil. Dissolution curves of CO2 and CH4 gases for Japanese heavy oil were measured using with a PVT apparatus to decide the pressures of bubble point for the gases. CO2 swelling factors of the heavy oil and Oman intermediate oil were measured from surface movements of oil columns placed in a high-pressure cell which was controlled less than 10 MPa for the oil reservoir temperature 50°C. Two oil swelling factors increased with increasing gas pressure, and swelling coefficients were evaluated for CO2 and CH4 gases. The swelling-time curves for an oil column were fitted with the analytical solution of one dimensional gas diffusion derivative equation, and CO2 gas diffusion coefficients in the oils, D(m2/s), were evaluated. The values of D in the heavy oil were presented as 1.1 to 1.6 % of that of the intermediate oil, and the empirical equation for values of D has been presented with function of exponential to API gravity. Based on the observation tests on oil drainage from the sandstone cores saturated with the heavy oil, gas dissolution in the heavy oil does not make any oil drainage, however foamy heavy oil including huge number of micron CO2 gas bubbles, that were generated in depressurization process, effectively contributed to oil drainage out from the cores.
Translated title of the contributionCO2 solubility of heavy oil related to CO2 EOR and storage
Original languageJapanese
Pages (from-to)522-529
Number of pages8
Journal石油技術協会誌
Volume76
Issue number6
DOIs
Publication statusPublished - Nov 1 2011

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Earth and Planetary Sciences(all)
  • Chemical Engineering(all)

Fingerprint Dive into the research topics of 'CO2 solubility of heavy oil related to CO2 EOR and storage'. Together they form a unique fingerprint.

  • Cite this