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:
Feb. 24, 1981
Filed:
Jul. 26, 1979
John V Fredd, Dallas, TX (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
A well packer and depending foot valve are landed in a well. A landing nipple depends from the foot valve. A tubing string sealingly engages the packer and includes a circulating valve. A transducer-valve fitting may be run with the packer foot valve assembly or it may be run at a later time and landed in the landing nipple. The foot valve is operated by an actuator which is positioned above the packer and is exposed to the casing tubing annulus as well as tubing pressure. The circulating valve is also exposed to casing-tubing and tubing pressure. The foot valve is controlled by the differential in pressures as is the circulating valve. A transducer may be landed in the transducer fitting and by selectively opening and closing the foot valve data may be taken from the well during both flow and non-flow conditions. After testing is completed the transducer and transducer fitting may be removed and a plug inserted in their place permitting flow thereafter through the foot valve which acts as a subsurface safety valve.