2-1-2 部分加熱法によるガスハイドレートの増進回収効果

抄録

In this study, we evaluated the effect of acid injection for enhanced natural gas production. To evaluate it with numerical analysis, we got the parameter about the calorific value in dissolution of Toyoura sand to three acids (Nitric acid, Hydrochloric acid and Sulfuric acid) and the reaction rate of the dissolution. Based on those results, we carried out simulations of the behavior in the MH reservoir in heating process by acid injection. The injection water (50 deg, °C) contained each acid (0.010 mol/L, 0.050 mol/L, 0.10 mol/L, 0.50 mol/L, 1.0 mol/L and no acid). As a result, MH reservoir was more heated in each acid injection than only hot water injection. The total gas production in the 3.0 years from starting the operation is enhanced by 17.2 percent at a maximum. In conclusion, the acid injection to MH reservoir is the good way of enhanced gas production from MH reservoir.