DEVICE FOR CLEANING OF LIQUID IN WELL Russian patent published in 1999 - IPC

FIELD: well equipment. SUBSTANCE: device is particularly intended for filtering liquid in well from mechanical particles. Suspended articles are separated from liquid by filtering prior to installing pump and putting it in operation. Device has tubular body with sealing unit for sealing device in casing string. Located below body is filter for liquid. Filter is provided with non-return valve. Sealing unit is made in the form of washers from elastic material. External diameter of washers is larger than internal diameter of casing string. Non-return valve of filter located below body of device is adapted for opening inside body. Installed above tubular body is also filter covered atop with non-return valve which opens inside body. EFFECT: higher efficiency. 1 dwg