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:
Dec. 12, 1995
Filed:
Dec. 14, 1992
Pat M White, Carrollton, TX (US);
Halliburton Company, Carrollton, TX (US);
Abstract
An annular safety system for an oil well. The annular safety system is in the form of a hanger mechanism. The hanger mechanism is particularly effective in an oil well equipped for gas lift operation where gas is injected into an annular space between the well casing and the production tubing in order to aerate produced oil migrating up the wellbore through the production tubing. The hanger mechanism includes a casing nipple which is run into the well with the casing and a stationary threaded tubing holder which is run into the well with tubing. The hanger mechanism includes a device which, upon running the stationary threaded tubing holder into the well through the casing nipple, secures the stationary threaded tubing holder in a particular position relative to the casing nipple and prevents upward and downward movement of the stationary threaded tubing holder relative to the casing nipple. The hanger mechanism also includes a device allowing the hanger mechanism to selectively, independently seal each of the annular space between the well casing and the production tubing to prevent flow of injected gas and produced oil from the wellbore. Further, the hanger mechanism includes a release mechanism which may be selectively activated to allow the stationary threaded tubing holder and other downhole equipment to be upwardly retrieved from the well.