Apparatus for verifying the inner diameter of tubulars forming a tubular string

An apparatus for verifying the inner diameter of a tubular, comprising:

• a float section, said float section sufficiently buoyant to float said apparatus in a fluid within a bore of said tubular;
• and
• a drift section attached to said float section, said drift section comprising a drift element having a desired diameter,
• wherein said float section comprises an elongated tubular member having a length sufficient to extend out of the uppermost tubular in a tubular string being run into a wellbore, when said apparatus is positioned within said bore of said tubular string, said bore of said tubular string containing fluid therein and said apparatus floating in said fluid.

An apparatus adapted to verify the drift diameter of tubulars comprising a tubular string, while said tubular string is being run into a wellbore containing a fluid, comprising:

• an elongated buoyant float section having an upper end and a lower end, said float section having sufficient buoyant force to float said apparatus in said fluid;
• and
• a drift section attached to said lower end of said float section, said drift section comprising a drift element having a desired diameter relative to said drift diameter,
• wherein said desired diameter of said drift element is sufficiently small to prevent contact between said body and said bore of said tubulars, around an entirety of a circumference of said bore of said tubulars.