Method for enhancing recovery ratio of coal-bed gas by injecting hot carbon dioxide into coal bed
A technology of carbon dioxide and coalbed methane, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low coalbed gas storage energy, weak adsorption capacity, limited improvement of coalbed methane recovery rate, etc., to achieve The effect of high recovery rate, sufficient source and wide source
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[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Of course, the following embodiments should not be construed as limiting the present invention.
[0031] Such as figure 2 As shown, the present invention provides a method for improving the recovery efficiency of coalbed methane by thermally injecting carbon dioxide into a coal seam, which is characterized in that it includes the following steps:
[0032] Step 1: After implementing CBM multi-branch horizontal wells on the surface, a single well will naturally produce gas until the output is lower than the industrial air flow standard (for example, when the well depth is less than 500m, the single well gas production will be less than 500m 3 / d; when the well depth is between 500 and 1000m, the single well production is less than 1000m 3 / d).
[0033] The multi-branch horizontal well of this embodiment is such as figure 1 As shown, multiple lateral wells 5 were d...
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