CASING CENTRALISER Russian patent published in 2010 - IPC E21B17/10 

FIELD: oil and gas industry.

SUBSTANCE: casing centraliser includes housing and centering elements made from elastic material, having inner cavity and rigidly fixed on housing with ends; inner cavity of centering element and inner cavity of casing are connected at the attachment place of centering elements to the casing by means of the channel having check valve. The section of centering elements has various profile (the shape of rectangle, circle, trapezoid, triangle or another shape) and located along the spiral on the surface of the centraliser housing, lower edge of elastic centering element is fixed on centraliser housing by means of glue or another way; at that, in order to fix the ends of elastic centering elements there used are rings for fixing the ends of elastic centering elements, which are fixed on centraliser housing by means of pins, welding or another method; one of ring edges is chamfered at an angle of 20 to 70 degrees. Besides there is nipple and coupling on centraliser housing to attach centraliser to casings.

EFFECT: development of centraliser with changed geometry for casing, which has minimum diametre when the casing is lowered to the well and maximum one after it is lowered and inclined or horizontal shaft is cemented.

6 cl, 2 dwg