METHOD AND DEVICE FOR FLUID-CONTAINING RESERVOIR ISOLATION Russian patent published in 2007 - IPC E21B33/13 E21B43/114 

FIELD: oil and gas industry, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: method involves creating disc cavern in rock; filling the cavern with plugging composition; creating technological window within reservoir cap, wherein technological window height and width are calculated from equation; fully crushing casing pipe body; washing-out rock and creating at least 2-3 disc caverns within technological window interval; filling well bore and disc caverns with light-weight salt or aqueous solution; repeatedly filling total well bore volume and disc caverns with plugging solution; filling opened well bore and disc caverns with plugging solution at decreased flow rate of 0.5-3.0 l/sec along with upper casing pipe part shoe sealing and increasing pressure. Device comprises pump, guiding jet nozzles and valve ball. Guiding jet nozzles extend in radial direction and are uniformly distributed along total body circle in upper, central and lower horizontal planes of section thereof so that 3-6 nozzles are located at each plane. Device also has bypass channels communicating device interior with guiding jet nozzles. Jet nozzles are united in 2 alternately acting groups. Nozzles installed in central horizontal plane are directed in horizontal plane. Nozzles located in upper and lower horizontal planes spaced apart 0.15-0.5 m are inclined at 7-30° to horizontal plane. Device also has slide with additional valve ball installed in upper part thereof.

EFFECT: increased efficiency.

2 cl, 6 dwg, 2 ex