DEVICE TO DIVIDE BOREHOLE TO SEPARATE SECTIONS Russian patent published in 2015 - IPC E21B33/12 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed device comprises pipes with lengthwise corrugation with sealing elements, upper and lower cylindrical sections of the pipe, top section thereof being provided with sealed piston with retainer. Bottom cylindrical section is provided with fixed bush from bellow. Nipple is fitted in the latter with the help of seals and provided with valve. From above, it is connected by link with said piston. Said pipes with lengthwise corrugation feature six-beam design and can be expanded to working size by internal pressure. Sealing elements are composed of closed elements filling the recesses with pipe beams. Temporary circular bulge is made between lower cylindrical section and said fixed bush. Nipple seals are composed of self-sealing inflatable resilient element. Above the latter cone expanding upward with outer spring-loaded plates to interact with said temporary circular bulge and to displace relative to said cone. Plane minimum diameter is smaller than inner contracted sections of the device. Clutch is arranged above said cone to interact with power pipe beams from inside at transportation position. End of upper cylindrical section of the device is provided with lengthwise grooves while sealed piston has ledges for lengthwise grooves.

EFFECT: sealed casing string-borehole annuity in single trip.

2 cl, 2 dwg