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. 18, 1989
Filed:
May. 10, 1988
Kwok-Ping Wong, The Colony, TX (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
A system for sealing around a wireline run into or pulled from wells includes a grease control head with a line wiper mounted on the well head and a grease injection control system. The grease injection control system supplies grease continuously at a constant pressure for injection into the grease control head. The control system utilizes a piston pump to supply grease to a grease chamber in a pressurizing accumulator. The accumulator has another chamber connected to a remote pressure source, which is separated from the grease chamber by a moveable partition. Constant pressure from the remote source is transmitted through the moveable partition to grease in the grease chamber maintaining a constant pressure on grease injected into the grease control head. The sealing system is provided with a conduit to return injected grease pumped through the grease head to a waste grease reservoir for disposal. This conduit includes a valve which may be closed to aid in reestablishing a blownout grease seal.