PC-type Bow-Spring welded Centralizers are applied for casing strings centering during
their RIH and cementing inside wells. The use of centralizers allows to achieve uniform
clearance between a casing pipe and well walls, thus preventing appearance of behind-the-casing cross flows (total insulation with cement slurry, without breaks), and
as a result significantly extending the well service life. Centering of a casing string is
provided with preset bow spring properties of centralizer planks.
PC-type bow-spring centralizers consist of two shells and six bow springs with a specific
profile and section.
The principal innovation in operation is in the design of PC-type bow-spring centralizer.
PC-type bow spring welded centralizers are provided with only two minimally loaded
weld seams arranged on centralizer shells. Centering planks of the centralizer have no
welds and are made of a solid steel sheet.
PC-type bow-spring centralizers are made of high quality sheet steel using sheet cutting
method and further multistage treatment of the blanks on sheet-benders.
Automatic sheet cutting provides perfect blanks with no need in further mechanical
treatment. Multistage bending on sheet-benders provides high strength and precision
of the constructions. Final welding and thermal treatment provide uniform strength of
the centralizer’s structure.
PC-type bow-spring centralizers are fixed on a casing string with special fixing screws.