Simulation test apparatus for migration of coal powder produced during production of coalbed methane well

The invention discloses a simulation test apparatus for migration of coal powder produced during production of a coalbed methane well and belongs to the field of coalbed methane mining. In the apparatus, an outlet line of a constant-flux pump (13) is serially connected with a backpressure valve (14) and an electromagnetic flowmeter (16) and is then communicated with an upper cavity of a piston stirring container (1), a lower cavity of the piston stirring container (1) is communicated with an axial inlet of a core holder (5); the inlet of the core holder (5) is provided with a pressure sensor I (4), and an outlet line is disposed in a container on a balance (11); two ends of an electromagnetic valve (7) are connected with an air compressor (6) and a liquid booster pump (8), respectively, and an outlet of the liquid booster pump (8) is communicated with an annular pressure inlet of the core holder (5). The apparatus further comprises an electrical control and monitor system used for monitoring and for controlling. The apparatus is capable of testing migration and clogging of coalbed fluid and coal powder in the mining process of coalbed methane. The apparatus has high pressure control and flow control precision, has low pressure and flow fluctuation and is easy to install and simple to operate.