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1. (WO2015199915) PRODUCTION STRING PRESSURE RELIEF SYSTEM

Pub. No.:    WO/2015/199915    International Application No.:    PCT/US2015/033718
Publication Date: Thu Dec 31 00:59:59 CET 2015 International Filing Date: Wed Jun 03 01:59:59 CEST 2015
IPC: E21B 34/00
E21B 34/06
E21B 34/08
F16K 17/00
F16K 17/02
F16K 17/04
Applicants: WOODS PETROLEUM LLC
Inventors: WOODS, Pete, A.
Title: PRODUCTION STRING PRESSURE RELIEF SYSTEM
Abstract:
A production string pressure relief system comprising a hollow cylindrical housing with an outer wall, a first relief valve assembly that is mounted on a first support base that is welded to the outer wall of the housing, and a second relief valve assembly that is mounted on a second support base that is welded to the outer wall of the housing directly opposite the first support base. Each of the first and second relief valve assemblies comprises a valve element that is in the shape of a spherical segment with a spherical sealing face, a cylindrical valve seat with a circular sealing face, and a leaf spring. The leaf spring provides a biasing force that pushes the spherical sealing face of the valve element against the circular sealing face of the valve seat to form a fluid-tight seal when the valve is in a normally closed position.