DEVICE FOR OPEN HOLE DIVISION INTO SEPARATE SECTIONS Russian patent published in 2013 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: device for open hole division includes longitudinally corrugated tubes with encapsulated components, upper and lower cylindrical sections. Encapsulated components are located at sections with lesser circumscribing circle. The upper cylindrical section is equipped with sealed piston and retention pin. The lower cylindrical section is equipped with nonexpansible bushing from below. Movable nipple is inserted hermetically into inner cavity of bushing. Nipple is equipped with valve and connected to piston by pull-rod from above. Encapsulated components are designed as closed components along tube perimetre. End sections of longitudinally corrugated tubes to be connected by welding are made as graduated bells corrugated longitudinally. Circumscribing diameter of bells is bigger or equal to circumscribing diameter of encapsulated diameter. Thickness of encapsulated components and distance between them can be adjusted without mutual overlapping in case of extension by rolling device after correction by inner pressure.

EFFECT: tightness of bore-hole annulus covering at significant differential pressure.

4 dwg