METHOD OF PRODUCTION STRING SECTION SEALING Russian patent published in 2016 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: while implementing the method losses of sealing are identified, a shutter is run in at the tubing string and fixed place of sealing loss, to this end mineral and polymer compound is used with properties of cold welding. The shutter is represented by a pipe or a group of in-series pipes with outer diameter less than inner diameter of the production string with total length exceeding the length of damaged section per at least 20%. Grooves with depths of at least 2 mm and width of at least 20 cm are lathed at the pipe beginning and ending; the above grooves are filled in with a layer of material having properties of cold welding, at that material shall protrude from the grooves per 2-10 mm, moreover this material is glued with glue layer to the groove bottom. Before running in of the shutter its mounting site at inner surface of the string is cleaned with scraper, length of the area for cleaning is selected on the basis of the shutter length with reserve of 5-10% above and below the mounting site. Upon running in of the shutter with applied material long sections in the area of groves are spread outward thus activating cold welding and ensuring fixture of the shutter to the production string.

EFFECT: improved efficiency of sealing, reduced water cut, increased oil flow rate.

1 dwg