The injection system of coalbed methane well is composed of surface multistage injection tank, surface manifold system and underground injection pipe.

1. Volume of ground multistage filtration water and gas separation tank ≥3 m3, height ≤2m, water tank material anti-corrosion, anti-leakage; Level 4 filtration regulation has been achieved.
2. The outer diameter of the reinjection pipeline is 16mm and the inner diameter is 12mm, with anti-bias wear, corrosion resistance, and compressive strength ≥3MPa.
3. Output capacity of ground reinjection water injection equipment is greater than 30L/min. The inlet and outlet of the water tank are equipped with more than 3, and the inlet and outlet are equipped with gate valves and other valves. The joints are made of stainless steel DN16 steel plastic pipe joints. The water inlet pipeline is provided with a three-way interface, and is equipped with overflow pipeline and outlet pipeline.
4. The reinjection pipeline is lowered into the well with the pump body. The casing pressure is within 1MPa, and the diluted liquid can be injected.
5, all supporting joints with anti-bias wear, corrosion resistance.