The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 1989
Filed:
Oct. 15, 1987
Larry R Russell, Houston, TX (US);
Kevin T Corbett, Missouri City, TX (US);
Exxon Production Research Company, Houston, TX (US);
Abstract
A drill pipe protector which surrounds and embraces a section of drill pipe. The protector includes at least an outer portion and surface made of an elastomeric material in which a quantity of small, hard particles are interspersed. During drilling operations when the protector is placed in sliding contact with the interior surface of casing in a wellbore, the particles exposed on the protectors surface abrade away rust and other protrusions from the inner surface of the casing to rapidly reduce frictional torque and drag experienced in running the drill string. As particles and elastomer are abraded away, additional particles are exposed. In the preferred embodiment the protector is a sleeve consisting of a pair of semi-cylindrical sections, each having an outer elastomeric layer containing approximately 27% by volume and 43% of the combined weight of substantially spherical glass particles sized in the range of 0.15-0.25 millimeters and having a hardness on the MOH scale of approximately 5.5.