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:
Mar. 14, 1978
Filed:
Sep. 14, 1976
Henry P Arendt, Dallas, TX (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
A seal unit for movement through a flow conductor for pumpdown piston or well swab service, including a mandrel body, a seal element mounting sleeve disposed for limited travel on the body, and elastic annular seal means secured on the mounting sleeve to seal with the flow conductor wall in response to a first fluid differential across the unit and to permit controlled bypass and load transfer under a second higher differential. The seal means includes spaced annular lips or fins and an annular choke ring which is expanded by limited sleeve movement in response to a fluid pressure differential load applied across the fins. When the pressure differential across the fins exceeds a predetermined value, the sleeve expands the choke ring which assumes a major portion of the pressure differential load relieving the fins to reduce fin wear. As a pumpdown piston, the unit is pumped along a flow conductor to drive a tool train by fluid flow in a direction from the fins toward the choke ring. As a swab, the unit is pulled in the opposite direction to agitate or displace fluid in a well.