FIELD: mining.
SUBSTANCE: formation method of a well in a coal layer involves drilling of the well mainly having a horizontal shaft in the coal layer using a flushing solution containing liquid, and pressure reduction in a down well so that drilling modes are not higher than balanced ones for drilling, mainly of the horizontal shaft owing to supplying flushing solutions by means of a pump mainly from the horizontal shaft of the well to surface.
EFFECT: drilling in layers with ultralow pressure without any risk of loss of flushing liquid and blockage of the layer.
30 cl, 11 dwg
