Aerated underbalanced drilling method for coal-bed gas
An underbalanced drilling and coalbed methane technology, which is applied in directional drilling, earthwork drilling, and flushing of boreholes, etc., can solve problems such as inability to break away cuttings, stuck drill, and affect drilling work
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[0026] In order to better understand the present invention, first combine figure 1 with figure 2 A brief introduction is given to the aerated underbalanced drilling method used in coalbed methane in the prior art.
[0027] Such as figure 1As shown, in the gas-filled underbalanced drilling project for coalbed methane in the prior art, a vertical well 2 is drilled from the ground at the position where the coalbed methane is to be exploited, and a cave 3 is built in the coal seam section below the vertical well 2 . During the formation of the vertical well 2, generally 177.8 mm (also referred to as 7 inches) casing is put into the vertical well 2 to form the wall of the vertical well shaft, and can form a good fluid channel and prevent the vertical well from collapsing. A horizontal well 1 is drilled at a conventional distance from the vertical well 2, for example at a distance of about 100-350 meters. After the horizontal well 1 undergoes the traditional one-drilling, two-dr...
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