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:
Oct. 02, 1984
Filed:
Dec. 01, 1982
Herve M Lefebvre, par Chartres, FR;
Francois C Gueuret, Voisins le Bretonneux, FR;
Compagnie Francaise des Petroles, Boulogne-Billancourt, FR;
Abstract
In a hydrocarbon production well in which the effluent is activated by an activation pump removably installed in a production pipe in the well, a safety valve is removably mounted in the production pipe below the activation pump. The safety valve comprises, in a lower part of the valve body, a foot valve and thereabove an obturator which is moved to its open position by an operating member which is provided with a piston slideably mounted in the valve body and separating first and second chambers. The first chamber is pressurized to open the valve, and the second chamber, which acts in opposition to the first chamber, is in communication with the bottom of the well below the foot valve, and is thus isolated from the interior of the safety valve when the foot valve is closed.