DEVICE FOR LIQUID CLEANING IN WELL SHAFT Russian patent published in 2013 - IPC E21B27/00 E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: device comprises a plug, a gravity filter, a debris accumulating container and a slot-type connection pipe, which are located in an upward direction. Besides, the proposed invention includes coupling sleeves, lower and upper umbrella-shaped rubber sealer of the well intertube space. The plug is provided with a valve with a seat diameter that exceeds maximum size of the well flush debris. Gravity filter has longitudinal slots and is closed with a fine-meshed screen. Size of the screen meshes is less than minimum size of impurities trapped in the well. Lower umbrella-shaped rubber sealer of the intertube space is arranged on the outer side of the debris accumulating container. Sealer is located between two sleeves at the distance from the plug, which is equal to 15-20% of total length of the device. Upper umbrella-shaped rubber sealer of the intertube space is arranged on the outer side of the debris accumulating container. Sealer is located between two sleeves at the distance from upper end of the device, which is equal to 15-20% of total length of the device. Slot-type connection pipe is provided with longitudinal slots with the width that exceeds maximum size of the well impurities.

EFFECT: improving the liquid cleaning in the well shaft from the floating debris and suspended particles.

1 cl, 1 dwg