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

FIELD: oil and gas production.

SUBSTANCE: casing centraliser accommodating a hollow cylinder case with radial canals and pipeline threads from both ends, centering elements representing corrugated pipes with annular tight ends outside of the case and the radial canals; a retainer assembly for the centering elements and an actuator of the centering elements are designed as valves mounted in the radial canals of the case. The ends of the corrugated pipe tightly interact with a surface of the case, and one ends of the corrugated pipe is fixed in relation to the case. The corrugated pipe is made of a pipe with the external diametre exceeding that of the well.

EFFECT: provided simplicity of manufacturing and assembly.

3 dwg