Annular safety system for oil well
December 14, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesWell tools Well bore liner hanger Well tool Method of moving a through-the-flowline installed safety valve through a curved flow line Subterranean well injection apparatus Hydraulic tubing tensioner Method and apparatus for multiple well completion Completion apparatus and method for gas lift production Method and system for maintaining and producing horizontal well bores Dual hydraulic set packer InventorAssigneeApplicationNo. 989752 filed on 12/14/1992US Classes:166/120, Anchor actuated by fluid pressure166/191, Spaced sealing portions166/212, Fluid pressure actuated166/217Expansible means translated by wedge or camExaminersPrimary: Britts, Ramon S.Assistant: Tsay, Frank Attorney, Agent or FirmInternational ClassesE21B 023/02E21B 023/04 E21B 033/124 AbstractAn 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.Other References
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