System and method for providing additional blowout preventer control redundancy
View Patent ↗An apparatus to allow backup or alternate fluid flow routes around malfunctioning BOP control components using a remotely installed removable hydraulic hose connection. The backup fluid flow route sends pressure-regulated hydraulic fluid to a BOP operation via an isolation valve rigidly attached to the BOP, then to a hose connected to an intervention panel on the BOP and finally through a valve that isolates the primary flow route and establishes a secondary flow route to allow continued operation. To increase reliability, the backup components route from a spare BOP function and are rigidly fixed to the BOP.
1. A BOP fluid supply apparatus, comprising:
a main source of hydraulic fluid;
a BOP function;
a primary fluid flow route from the main source of hydraulic fluid, through a primary component assisting in operating the BOP function, through a first valve, through a second valve, and then to the BOP function; and
a secondary fluid flow route from the main source of hydraulic fluid, through an isolation valve rigidly fixed to the BOP, through a pilot-operated hot spare valve rigidly fixed to the BOP, through a hose removably connected to an intervention panel, through the second valve, and to the BOP function, wherein the secondary fluid flow route bypasses the primary component assisting in operating the BOP function and the first valve and provides hydraulic fluid to operate the BOP function;
wherein the primary fluid flow route comprises a blue pod primary fluid flow route and the secondary fluid flow route comprises a blue pod secondary fluid flow route; and
further comprising a yellow pod primary fluid flow route from the main source of hydraulic fluid, through a yellow pod primary component assisting in operating the BOP function, through the first valve, through the second valve, and then to the BOP function; and
a yellow pod secondary fluid flow route from the main source of hydraulic fluid, through a yellow pod isolation valve rigidly fixed to the BOP, through a shuttle valve connected to the blue pod isolation valve, through the pilot-operated valve, through the hose connected to the intervention panel, through the second valve, and to the BOP function, wherein the yellow pod secondary fluid flow route bypasses the yellow pod primary component assisting in operating the BOP function and the first valve.
2. The apparatus of claim 1 , wherein the primary and secondary fluid flow routes pass through a regulator.
3. The apparatus of claim 1 , wherein the secondary fluid flow route allows operational redundancy of the BOP function.
4. The apparatus of claim 1 , wherein the pilot-operated valve is controllable at a surface station and obtains hydraulic fluid for pilot operation from a hot spare source on the BOP.
5. The apparatus of claim 4 , further comprising an electronic multiplex system at the surface station that can be programmed to control the primary and secondary fluid flow routes.
6. The apparatus of claim 1 , wherein the intervention panel comprises a plurality of connection ports leading to a corresponding plurality of BOP functions.
7. The apparatus of claim 1 , wherein the first and second valves are shuttle valves and the pilot-operated valve is an SPM solenoid-operated valve.
8. The apparatus of claim 1 , wherein the isolation valve can be operated by an ROV.
9. The apparatus of claim 1 , wherein the primary fluid flow route enters the second valve through a primary inlet and the secondary fluid flow route enters the second valve through a secondary inlet.