Drilling Safety Valves
Drilling safety valves include Kelly Valves, Inside BOP Valves (IBOP Valves), and Retrievable Drop-In Check Valves (RDCV).
Drilling safety valves include Kelly Valves, Inside BOP Valves (IBOP Valves), and Retrievable Drop-In Check Valves (RDCV).
Kelly Valve
The Kelly Valve, also called Full Opening Safety Valve (FOSV), can be used as a drill pipe safety valve, Upper Kelly Valve, or Lower Kelly Valve.
- Upper Kelly – The valve can be used to control blowout pressures by shutting off flow in the drill string at any time
- Lower Kelly – The valve can stop mud loss when the Kelly is disconnected from the drill string.
Inside BOP (IBOP) Valve
The IBOP, also called Gray Valve or BVR, is a back pressure valve used in the drill string to prevent the well from flowing uncontrollably up the drill string. It is generally used in 2 ways:
- On the rig floor with a complete IBOP configuration.
- Below the rig floor without a plug when connected in the drill-string. It can be left in the drill string as long as necessary to re-establish control of the well-pressure balance.
Retrievable Drop-In Check Valves (RDCV)
The RDCV, also called Dart Valve or a Back-Pressure Valve, controls backflow through the drill pipe during a kick or when tripping pipe into the hole against pressure. Check-valve compatibility should be checked with Kelly Cock free passage.
Drilling Safety Valves features as below:
- Standard – for normal drilling conditions
- H2S Trim – for low H2S concentrations
- NACE – For high H2S concentration; fully meets the NACE MR0175.
Kelly Valves
Kelly Valves can be provided as a one or two-piece construction.
Kelly Valves are manufactured from AISI 4140/4145/ 4330 or 17-4 PH alloy steel.
Features include:
- Simple construction for trouble-free operations and easy servicing sealed lubrication packing complete stainless steel valve parts available for Sour Service
- Available in 10,000 and 15,000 PSI working pressure operating wrench and thread protectors
- One-piece construction material 4145 H Mod (120 ksi for standard & H2S Trim versions, 100 ksi for full NACE version)
- Length to be specified (deep boring limitations)
- Generally for API connections
- Two-piece construction material 4330 V Mod (130 ksi for standard & H2S Trim versions, 100 ksi for full NACE version)
- Generally for high torque connections with larger bore ID passage
- Longer than standard valve
- Special design requirements
Two Kelly Valve seat type options:
- KC2S with PTFE rings inserted in both upper and lower seats and KC4S with metal-to-metal seal. The KC2S PTFE-ring provides good sealing capability, even at low pressures
- KC4S metal-to-metal seal valve, sealing is performed by controlled elastic deformation of the special plug. This technological choice, combined with enhanced-seat guidance gives excellent sealing characteristics for the life of the valve
Inside BOP (IBOP) Valve
The IBOP valve (BVR) series are linked to passage ID.
Features include:
- OD sizes from 3-3/8″ to 9-1/2″
- ID sizes from 1-1/2″ to 2-13/16″
- Available in 10,000 and 15,000 PSI working pressure.
Retrievable Drop-In Check Valves (RDCV)
Features include:
- check valve OD sizes from 1-9/32″ to 3-7/64″
- check valve ID sizes from 3/8″ to 1-11/16″
- Available in 10,000 and 15,000 PSI working pressure.