Date: ON REQUEST
All fluids that come out of a well pass through Choke Valves, which control fluid
flow. The purpose of a Choke Valve is to control the release of fluids from a
well. On the other hand, Automatic Safety Systems are designed to automatically shut in the well
during emergencies. An emergency could be a fire or abnormally high or low pressure
fluctuations, due to ruptured lines, faulty surface equipment, damaged wellheads or
other dangerous situations. The function of a Sub‑Surface Safety Valve (SSSV) is to
automatically and reliably close in the well below the surface of the earth when there is an
emergency. It is an international requirement that offshore wells are fitted with SSSVs. If the land
wells in Kuwait had been fitted with SSSV, the damage to oil reservoirs and the environment in
Kuwait would have been much less. All the oil fires would have gone out due to lack of fuel.
*To Identify and explain the functions and purpose of choke valves in production applications.
*Explain why wells have surf ace‑controlled sub‑surface safety valves.
*Describe how these valves are held in the open position. Explain what forces close these valves.
*Explain the opening procedures for the valves and the importance those procedures.
*Describe the surface installations that control these valves. Explain why oil and gas wells have surface safety valves. *Explain how abnormal well flowing conditions are detected or sensed.
*Explain what ‘fail closed’ means for safety systems. *Explain what is meant by ‘sequential shut‑in’, and explain why this is carried out.
*Explain what Surface Safety System ancillary equipment is used for
*General Application (Fixed Positive Chokes and Adjustable Chokes)
*Choke Materials, Erosion, Plugging
*Operating Choke Valves and Critical Flow
*Emergency Shutdown Systems (ESD) and Monitoring Systems
*Ancillary Systems (Fusible Plugs, ESD Valves, Quick Exhaust Valves & Block and Bleed Valves
*Wireline Retrievable Type SSSV
*Opening Procedure for SSSV
Faculty: Professor Duru Appah, Engr.Ubani Chikwendu, Uniport and Mr M.I. Ofili