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:
Jun. 28, 1983
Filed:
May. 20, 1981
Frederic D Wells, Jr, Shreveport, LA (US);
W-K-M Wellhead Systems, Inc., Shreveport, LA (US);
Abstract
A geothermal wellhead assembly (22) has a casing head (26). An inner casing (12) within the casing head has a restrained lower end portion and an unrestrained upper end portion extending above the casing head. An expansion spool (28) is mounted on the upper end of the casing head and receives the upper end portion of the inner casing. An expansion sleeve (92) fits within the expansion spool. The outer surface (94) of the expansion sleeve is adjacent the inner surface (60) of the expansion spool and an annular space (98) is defined by the inner surface (96) of the expansion sleeve and the outer surface (76) of the inner casing. A packing assembly (108) is mounted within the annular space and extends in sealing relation between the inner casing and the expansion sleeve. The packing assembly is movable with the upper end portion of the inner casing as the inner casing moves longitudinally in response to temperature changes within the wellhead.