Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Gregory James Alexander Andrigo0
Date of Patent
February 26, 2019
0Patent Application Number
152586710
Date Filed
September 7, 2016
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A centralizer sub, and system for enhanced access to subterranean zones from the surf ace as used in oil and gas wellbore installations to center a pipe or casing within a wellbore or previous casing string during run-in, installation, or cementing procedures. In under-reamed applications, casing strings and centralizers pass through a smaller casing string before opening up to a larger hole where repeated compressions and decompressions of bow strings of centralizers can compromise integrity and reliability. A centralizer sub, and system reduces and controls insertion and running forces to preserve centralizer integrity and down-bore surfaces and equipment.
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