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:
Nov. 04, 1997
Filed:
Mar. 27, 1996
Charles O Stokley, Houston, TX (US);
TAM International, Houston, TX (US);
Abstract
A casing circulator 30, 54, 162 is provided for pumping fluid into a casing string to fill the casing string, and for temporarily sealing with an upper end of the casing string to circulate pressurized fluid through the casing string. The casing circulator includes a mandrel 130 axially movable with respect to a circulator body 84 from a retracted position to an extended position in response to fluid pressure acting on a piston 126. In the retracted position, the casing circulator is positioned with respect to the casing string for filling the casing string with fluid. When moved to its extended position, a sealing element 56, 158, 164 supported on the mandrel is in sealing engagement with the upper end of the casing string to circulate fluid through the casing string. According to the method of the invention, pressurized fluid is applied to the casing circulator to move the mandrel to the extended position, and may also be used to expand the sealing element into sealing engagement with the casing string.