Draining and mining method for coal-bed gas well
A coalbed methane well and coalbed methane technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low liquid production, small pressure drop funnel area, slow drainage and analysis time, etc., and achieve high The effect of daily gas production
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[0018] Example 1: Such as figure 1 As shown, a method for drainage and production of a coalbed methane well, tubing 1 is in the wellbore 2; coal seam section 3, analytical pressure 4, coal seam initial pressure 5, pressure drop funnel curve 6;
[0019] On the area of the pressure drop funnel curve 6, because the analytical pressure 4 is less than the initial coal seam pressure 5, the coalbed methane will analytically migrate from the direction of high pressure to low pressure;
[0020] The depth of the well is 1200 meters, the initial coal seam pressure is 7 MPa, and the analytical pressure (that is, as the bottom hole flow pressure drops, coalbed methane begins to resolve from the adsorption state in the coal rock to the free state, and migrate to the wellbore. The bottom hole flow pressure at this time is called For a well with a desorption pressure of 2.5MPa, according to the control concept of "continuous and slow", the liquid level drops 3 meters per day, and it takes 150 day...
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[0021] Example 2: Such as figure 2 As shown, a method of coalbed methane well drainage,
[0022] The control liquid level is at the second control point, which is below the bottom boundary of the coal seam section 3. At this time, the liquid column in the wellbore 2 is used for pressureless production of the coal seam, and the coal seam is a pure gaseous flow, and gas can be produced in large quantities; avoid slow lowering of the liquid level As a result of the long-term gas-liquid two-phase flow in the coal seam, neither coalbed water nor coalbed methane can be produced smoothly, the area of the pressure drop funnel is small, and the gas production is low.
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