The hydraulic self-contained safety system (HSCSS) is a highly reliable control system for shutdown valves (SDV) or surface safety valves (SSV). The low-cost HSCSS is designed specifically for remote locations where external power sources are not available. However, it functions equally well in all applications requiring a basic shutdown system such as wellhead Christmas trees and pipelines.
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The standard system features high- and low-pressure shutdown functions, a high-temperature shutdown function (fusible element), and an emergency shutdown (ESD) function. Control of the subsurface safety valve is an optional feature available with all models. These original designs for our highly reliable systems come from our Axelson&#; product portfolio.
This system is completely self contained and only requires that the operator manually pressurize the hydraulic system to put the safety system in service, opening the valve and arming the high-flow hydraulic pressure sensors.
When the system is put in service, the valve remains open until an event triggers the shutdown sequence. The shutdown sequence ends with the actuator failing to the safe position.
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Surface-controlled subsurface safety valves (SCSSVs) are critical components of well completions, preventing uncontrolled flow in the case of catastrophic damage to wellhead equipment. Fail-safe closure must be certain to ensure proper security of the well. However, this is not the only function in which it must be reliable&#;the valve must remain open to produce the well. Schlumberger surface controlled subsurface safety valves exceed all ISO and API Spec 14A requirements for pressure integrity, leakage acceptance criteria, and slam closure.
Through decades of innovation and experience, Schlumberger safety valve flapper systems are proven robust and reliable. The multizone dynamic seal technology for hydraulic actuation of subsurface safety valves is a further improvement in reliability performance when compared with traditional seal systems in the industry.
The multizone seal technology was developed and proved with exhaustive verification and validation of reliability, longevity, and performance. The validation methodology utilized a unique sapphire crystal bore, enabling the design team to view the seal&#;s dynamic and static performance in real time while simulating wellbore pressure and temperature conditions.
The multizone seal technology is currently available in the GeoGuard high-performance deepwater safety valves, which is validated to API Spec 14A V1 and V1-H.
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