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:
Jan. 04, 2000
Filed:
Mar. 05, 1998
Michael Thomas Cunningham, Plantersville, TX (US);
James L Dean, Spring, TX (US);
Oceaneering International, Inc., Houston, TX (US);
Abstract
A stab for a gas-lift injection line is disclosed which includes a built-in check valve to exclude seawater as the stab is being delivered to the subsea manifold. The check valve can be a spring-loaded poppet which can be pressure-balanced with the surrounding hydrostatic forces, or alternatively, preloaded with the use of a pressurized chamber working in conjunction with a biasing spring to hold the check valve in the closed position during delivery. After insertion of the stab into the subsea manifold, the gas flow begins in the stab, which overcomes the forces of the spring and/or pressurized compartment to push the check valve into the open position to allow gas-lift flow through the manifold and down the annulus into the gas-lift valves in the well. Bypass flow passages are incorporated into the plug to provide an additional force to hold the plug in the open position once the gas-lift pressure is applied so as to prevent chattering of the check valve component in the stab.