RESERVOIR CLEANING AND COMPLETION DEVICE Russian patent published in 2015 - IPC E21B37/00 E21B43/25 E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: device includes flow string run down to the well and complete with strainer on the underside and at the top it is complete with packer installed in the well above the reservoir. There is a saddle in the flow string. Swab may be installed in the flow string. There is also a gate for discharge to the flow string. The gate is made as a ball fixed rigidly to a blind rod. The strainer is made with the upper and lower rows of openings. Inside the strainer each opening of the upper and lower row is equipped with a knock-off valve breakable upon discharge of the gate to the flow string. The upper and lower rows of openings are made at distance of the reservoir height. Sludge-collecting chamber is fixed rigidly to the strainer from below. Over the packer the flow string is complete with a row of channels sealed hermetically from inside by the saddle fixed in the flow string by shear ties. Under the row of channels in the flow string there is inner circular bore, wherein shutoff split-type spring ring is installed. From the well mouth to the flow string an axially-movable plug is inserted, and the above plug may interact with the saddle, break shear ties fixing the saddle in the flow string with opening a row of channels in the flow string, it is capable of limited axial movement with the saddle downwards up to thrust of the saddle into the limiter made at the flow string lower end and fixation of the plug in result of axial movement upwards upon thrust of the saddle into the flow string limiter.

EFFECT: improved efficiency of reservoir completion due to pre-cleaning of the reservoir bottomhole zone at deep depression generation.

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