RIGID-ELASTIC CENTRALIZER Russian patent published in 2023 - IPC E21B17/10 

FIELD: well drilling.

SUBSTANCE: devices for centering casing strings of oil and gas wells. The rigid-elastic centralizer consists of a body and is made with the possibility of limiting movement due to restrictive rings fixed on the casing with the help of locking elements. The body of the centralizer is made of two parts. Each of the body parts is made with elastic blades evenly spaced along the perimeter. Parts of the centralizer body are interconnected by longitudinal bars fixed on the outer side of the elastic blades. Rubber restrictive stops are made on the inner side of the elastic blades. The bars are made of low-friction, rigid and profiled and are fixed on the outer side of the elastic blades with the help of hinges. The length of the rigid longitudinal profile low-friction bars exceeds the length of the elastic blades by 2.5 times.

EFFECT: increased reliability of operation of the rigid-elastic casing string centralizer and expansion of its operational capabilities.

1 cl, 3 dwg