Backward-flowing prevention air hammer drill for foam drilling
An anti-backflow and air hammer technology, applied in the field of oil and gas well drilling, can solve problems such as non-working, affecting normal drilling, and air hammer stuck, and achieve the effect of reducing drilling costs and reducing the number of trips.
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[0022] 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.
[0023] The invention is provided with a conical check valve at the upper end of the center hole of the air hammer bit. When connecting a single root and stopping drilling for maintenance, if the two-phase fluid formed by formation water and cuttings enters the water hole of the bit, it can rely on buoyancy to force Close the one-way valve to block formation water and cuttings from entering the air hammer to avoid sand jams in the air hamm...
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