| 摘要 |
The present invention relates to system and method for extracting shale gas through a bore hole located within a geological area. The system and method comprises a production pipe surrounded by a filter assembly, where the production pipe passes through different geological layers, such as a water permeable layer above an underlying shale layer. During extraction of gas from the shale layer, the filter assembly can capture and filter out any contaminants that are released before they enter the water permeable layer. The filter assembly includes lower expandable bell and a stacked arrangement of filters. A vacuum may be used to encourage filtration. |
