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:
Apr. 02, 2002
Filed:
Mar. 02, 2000
Stéphane Hiron, Igny, FR;
Vincent Tourillon, Paris, FR;
Christophe Rayssiguier, Houston, TX (US);
Gilles Cantin, Verrieres le Buisson, FR;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
An actuator ( ) designed to remain without maintenance down a well for a prolonged period comprises at least one sealing bellows ( ) and preferably a compensation bellows ( ) between the well fluid and an internal chamber ( ) that is full of hydraulic fluid. The bellows ( ) serve to make it possible either to omit dynamic elastomer gaskets altogether or at least to protect them from the well environment. The actuator ( ) e.g. of the electromechanical type, can serve in particular to control a valve ( ) having an opening of adjustable size. Both bellows ( ) are advantageously made of stainless steel. They can be mounted end-to-end or they can be quite separate.