DEVICE FOR CLEANING BED AND MAINTAINING BED PRODUCTIVENESS Russian patent published in 2005 - IPC

FIELD: oil extractive industry.

SUBSTANCE: device has pit-face cutting valve and mounting tool. Cutting valve has body, packer with check valve and perforated tail. Mounting tool has hollow rod, connected by shear elements to expanding cone of packer, lower and upper bodies. Lower body is provided with self-compacting collar, and upper - through tubing string of limited volume and sleeve is connected to drop valve cylinder. Valve rod is connected to rope, on which device is lowered into well. Hollow rod and tubing string form depression chamber being at constant atmospheric pressure. Rod has upper and lower shelves. On shelf of upper body expander of self-compacting collar having longitudinal grooves is mounted. After raising of mounting tool from well packer, body with tail and check valve remain in it. Then a pump is lowered into well.

EFFECT: lower costs.

3 dwg