Patent ID: 11933113
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 5:
6. A centralizer comprising:
a body defining a central bore, a plurality of cavities between an outer surface of the body and the central bore and comprising a downhole cavity and an uphole cavity, a plurality of slots having an opening to an exterior of the body and radially offset from the central bore, wherein the body further defines interior ports between the plurality of cavities and the central bore, exterior ports between the plurality of cavities and the exterior of the body, and rod ports extending at least longitudinally between the plurality of cavities and one of the plurality of slots;
a plurality of springs with each housed in one of the plurality of the cavities and having a downhole end abutting a downhole end of that cavity and comprising a downhole spring housed in the downhole cavity and an uphole spring housed in the uphole cavity;
a plurality of pistons with each housed in one of the plurality of cavities and having a downhole surface abutting an uphole end of the spring in that cavity;
a plurality of sliding rods with each having a downhole end connected to a back surface of one of the plurality of pistons, wherein each of the plurality of sliding rods has a portion extending through one of the rod ports into one of the plurality of slots;
a plurality of expansion beams having a first end pivotally connected to a second end of one of the plurality of sliding rods and a second end pivotally connected to one of a plurality of centralizer pads; and
the plurality of centralizer pads having an outer surface.