2002 Fiscal Year Final Research Report Summary
Application of Polymer Gelation Method to Blockage of Gaseak from CO2-Sequestered
| Project/Area Number |
13650984
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
資源開発工学
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
MASUDA Yoshihiro The University of Tokyo, The University of Tokyo, Graduate School of Engineering, Associate Professor (50190369)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHIGEMI Naganawa 東京大学, Graduate School of Engineering, Research Associate (10237539)
|
|---|
| Project Period (FY) |
2001 – 2002
|
| Keywords | carbon dioxide / aquifer / sequestration / gel / porous medium / global warming |
|---|
| Research Abstract |
In geological CO2 sequestration, the injected CO2 gasis assumed to be completely trapped into the aquifer by the cap rock of non-permeable formation. However, there is some possibility of gasleak to the upper zone through natural fractures and high-permeability streaks. This studlexperimentallyinvestigated the applicability of our proposed polymer gelation methotd the blockage of gasleak from CO2-sequestrated resenoirs.
The following results are obtained from the experiments injecting the gelant (aqueous solution of polyacrylamide, NaA2O and NaOH) into glass-bead packed cores. (1) The blockage of CO2 gas was possible by this gelant injection process. The gas permeabilities of the cores reduced to 1/16 to 1/115 of their initial permeabilits by gel formation after repeating injection of the gelant. (2) The effect of gas-blockage by gel formation depends on concentration, molecular weight and hydrolysis of polymer molecules in the gelant solution, and core permeability. The experiments revealed at the gas-leak was stopped through about 10-darcy core by injecting the gelant solution having 250ppm NaAIO2, 250-ppm NaOH, and 500-ppm polyacrylamide(its molecular weigh is 13 million and 30percent hydrolysis). (3) Gel formed in a 1-m long interval of the core could hold the gas pressure of about 2.0 MPa for preventing galseakage.
The further experiments simulating insitu condition of the field aquifer is necessary fo real application of this gelation method, but this method is considered to be promising for a measure to block galseak in the geological CO2 sequestration because the permeability of real sediments is much lower thathe core permeabilityof the experiments. The separate report summarizes the experimental results in detail anthe recommendations to future studies.
|
Research Products
(4 results)
