DEVICE FOR WELL CLEAN-UP Russian patent published in 2012 - IPC E21B37/00 E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: device comprises a cylindrical vessel and a plunger with a valve in a cylindrical vessel, installed as capable of reciprocal motion. The cylindrical vessel in the upper part is connected with a striking valve, and in its lower part it is connected to a perforated nozzle, which in its turn is connected to a packer, and the packer - to a tail. Under the plunger valve there is a valve holder, to which a stem is fixed at the bottom. In the perforated nozzle below perforation holes there is a valve device comprising a casing, a valve seat, a plate valve with a stem, springs and a plate holder. The stem fixed in the holder and the stem of the plate valve are installed as capable of contact.

EFFECT: invention provides for the possibility to reduce sand seepage under impact, to control value of depression impact and to realise impact whenever necessary.

1 dwg