Anti-blocking sieve tube column integrating oil collection and sand flushing

The invention discloses an anti-blocking sieve tube column integrating oil collection and sand flushing. The column includes a coupling, a sieve tube and a sand flushing tube, the top of the sieve tube is connected with the coupling, the bottom of the sieve tube is connected with an inner blind plate and sleeved in the sand flushing tube, the blind plate at the bottom of the sieve tube is fixed tothe sand flushing tube through shearing pins, and an axial sliding mechanism is connected between the blind plate and the sand flushing tube; the lower end of the sieve tube is provided with an innersand flushing hole, a locking device is arranged at the upper end of the sand flushing tube, an outer sand flushing hole is formed in the lower end, the tube column body is pressed appropriately, andafter the shearing pins are cut off, the blind plate and the sand flushing tube move oppositely through the axial sliding mechanism; the locking device of the sand flushing tube is connected with thecoupling to tightly lock th