DEVICE FOR SCALE PREVENTION IN WELL Russian patent published in 2014 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry and intended for scale prevention. The device contains a flow column with a deep well pump, a control station at the wellhead, wellhead equipment completed with a discharge line with a damper valve installed at the upper end of the flow column. The deep well pump is equipped with from below shank run in below the perforated interval. The wellhead equipment is equipped with two pressure lines communicated with tubing-casing annulus. The first line is completed with a union and a damper and connected to the wellhead pump unit. The device is equipped with manifold line with a damper connecting hydraulically the well discharge line to the second line equipped with a damper downstream the manifold line. In the first position the two-way flow switch allows delivery of chemical from the first pressure line to tubing-casing annulus of the wall. In the second position the switch couples the discharge line with fluid extracted from the well through the manifold line to the second pressure line.

EFFECT: raised reliability, simplified design.

2 dwg