Surface controlled subsurface safety valve

Details Surface controlled subsurface safety valve Surface controlled subsurface safety valve

E - Fixed Constructions

21

B

166/44

E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1195607

SURFACE CONTROLLED SUBSURFACE SAFETY VALVE Abstract of the Disclosure A surface controlled subsurface safety valve for deep well service. Communication of control fluid to the subsur- face safety valve is controlled by a pilot valve at a subsur- face location in close proximity to the safety valve. Respon- siveness of the subsurface safety valve to decrease in control fluid pressure is thereby increased and the safety valve's closure speed is also increased. The pilot valve controllably communicates pressurized control fluid to open the safety valve and allows control fluid to be displaced into the flow path through the safety valve during valve closure. Background of the Invention 1. Field of the Invention This invention relates to surface controlled subsurface safety valves for controlling fluid flow within a well. The invention also rotates to a pilot valve for communicating control fluid to the safety valve from the well surface. 2. Prior Art A common limitation of conventional surface controlled subsurface safety valves is the volume of control fluid which must be displaced from the valve's control chamber to permit valve closure. Preferably, safety valves are designed to close when control fluid pressure drops below a preselected value. Thus, damage to the wellhead and/or control system should result in closure of the safety valve at its downhole location. For conventional safety valves operated by a single control fluid conduit from the well surface, various fluid forces resist valve closures. These forces include the hydrostatic pressure of fluid in the conduit, inertia of fluid in both the conduit and the control chamber of the safety

413646

Affiliated with

Also associated with

Rating

Surface controlled subsurface safety valve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Surface controlled subsurface safety valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface controlled subsurface safety valve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1226815