ASSEMBLY FOR GRAVEL PACKING BY "FROM-TOE-TO-HEEL" METHOD AND BY REVERSE CIRCULATION OF EXCESS SUSPENSION AS PER JOHN P.BROUSSARD AND CHRISTOPHER A.HALL METHOD Russian patent published in 2016 - IPC E21B43/04 

FIELD: oil industry.

SUBSTANCE: group of inventions relates to production of gravel filters for oil and gas wells. Device includes a housing located in the well and forming a through channel, one or more sections arranged on the housing. Each section comprises an insulation element arranged on the housing and insulating an annular space around the section from other sections, a window on the housing, which provides the fluid medium flow between the through channel and the annular space, a filter arranged on the housing and interconnected with the annular space, a gate lock arranged on the housing and preventing the fluid flow from the through channel to the filter, a working string, which forms the outlet, controlled in the housing in relation to each section. Working string in the first operating mode delivers the composition for processing the bottomhole zone from the outlet to the annular space section through the window. Working string in the second operating mode receives the reverse circulation from the through channel to the outlet.

EFFECT: gravel packing process is simplified.

33 cl, 24 dwg