Coalbed methane horizontal well underbalance drilling system and method thereof
An underbalanced drilling and horizontal well technology, applied in wellbore/well components, wellbore/well valve device, earthwork drilling, etc. Reducing drilling cost, increasing gas production, and good degassing effect
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[0105] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0106] See attached figure 1 Attached Figure 8 , The embodiment of the present invention discloses an underbalanced drilling system for a horizontal coal bed methane well, which is used for drilling the coal seam in the horizontal wellbore 1 to mine the coal bed methane; including: casing 2, drill pipe 3, deflector 4, Top drive 5, degas valve 6, water-gas mixing supply unit 7 and three-phase separator 8;
[0107] The casing 2 is installe...
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