PROCEDURE FOR COMPLETION OF NOT-CASED PORTION OF BORE OF BOREHOLE Russian patent published in 2011 - IPC E21B43/10 

FIELD: oil and gas production.

SUBSTANCE: invention refers to procedure for completion of not-cased portion of bore of borehole in underground formations containing hydrocarbons. The procedure consists in arrangement of a sleeve in a point of the borehole bore, fixed beforehand, in securing the sleeve and in its expansion with a mandrel. Also, the sleeve is made in form of one or several filters with blind notches and corrugated ends. Before expanding the sleeve with the mandrel there is boosted excessive pressure to straighten corrugations on ends of the filters and to fix them relative to walls of the borehole. Local destruction forming slits of the filter occurs in the points of the notches at expansion with the mandrel. Due to absence of holes in the filters rock does not clog inside the filters when assembly is lowered into the borehole. Additionally, slit orifices of the filters formed directly in pay facilitate efficiency of filter operation.

EFFECT: favourable conditions at sleeve expansion maintain rigidity of filter shape and facilitate transfer of sleeve along bore of borehole.

9 dwg