| 1 | Measuring the amount of natural gas that is leaking during drilling is one challenge. | |
| 2 | The SF6 concentration was measured to obtain the local dispersion and capture efficiency of the pull hood. | |
| 3 | Four methods of lost gas calculation of coal sample have been introduced, the results of calculation with different methods are compared, and general trend was obtained by actual data. | |
| 4 | Accurate calculation of the lost gas quantity under drilling fluid is a key to estimate coalbed methane(CBM) content. | |
| 5 | Generation of uranium was closely related to migration and escaping of natural gas and may be also relevant to hydrothermal solution activities during epigenesis period. |
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