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:
Jul. 18, 2023
Filed:
Apr. 16, 2021
Applicant:
Silverwell Technology Ltd., Histon, GB;
Inventor:
Joel David Shaw, Houston, TX (US);
Assignee:
SILVERWELL TECHNOLOGY LTD., Cambridgeshire, GB;
Primary Examiner:
Int. Cl.
CPC ...
E21B 43/12 (2006.01); E21B 34/08 (2006.01); E21B 34/14 (2006.01);
U.S. Cl.
CPC ...
E21B 43/1235 (2020.05); E21B 34/08 (2013.01); E21B 34/14 (2013.01); E21B 2200/02 (2020.05);
Abstract
An annulus safety valve assembly for controlling gas flow in a wellbore annulus that includes a passage, a check valve in the passage, and an actuator that is selectively changed between first and second states. The actuator is bi-stable, and requires no energy to remain in either state. When the actuator is put into one of the states, the check valve configuration is changed from one way flow to two way flow. Reconfiguring the check valve into the two way flow configuration vents lift gas from inside the annulus that is below the check valve.