CENTRALISER FOR ADDITIONAL CASING STRING CENTRALISING INSIDE MAIN CASING STRING AND ITS MANUFACTURE METHOD Russian patent published in 2010 - IPC E21B17/10 

FIELD: oil-and-gas industry.

SUBSTANCE: centraliser for additional casing string cementation inside of a main casing string, includes cylindrical case with blades, fixed with fixers on its surface and equipped with top and bottom cants. The cylindrical case executed as a pipe of the additional casing string, and fixers as a top and a bottom rings with conical external surfaces, interacting with blades cants and stiffly fixed on the pipe. The centraliser manufacturing method includes the cylindrical case with blades manufacture, and its installation between sleeves as a part of the additional casing string, at that the cylindrical case made as a pipe of the additional casing string, and install blades with the top and bottom cants on the pipe surface, clamping blades cants from the top and the bottom with the fixer rings conical surfaces, which are stiffly fixed on the cylindrical case surface, after that fix it between the additional casing string pipes. The centralizer for additional casing string centralising inside of a main casing string and its manufacture method allows decrease metal consumption, because the pipe of the additional casing string used as the cylindrical case, and centralizers crosscut profile area decrease allows to use them as a part non-sleeved additional casing string , keeping well pas through diametre at a large.

EFFECT: centraliser's blades dislocation on the pipe itself increase between blades channels throughput capacity, which allows to decrease pumping in cement flow resistance and increase cementation quality.

2 cl, 2 dwg