Retrievable Drop-in Check Valve (RDCV)

The Retrievable Drop-in Check Valve (RDCV) controls back flow from high-pressure formations into the well and up the drill string, while still allowing downward circulation. Once back flow is under control, the check valve can be retrieved by wireline.

If a kick starts while tripping out, a drill pipe safety valve or kelly cock is closed, the kelly is reconnected and the RDCV is pumped down to its landing sub, where it locks itself in place under downhole pressure.

Main features

• Landing sub OD from 3-3/8" to 8-1/2"
• Check valve OD from 1-9/32" to 3-7/64"; ID from 3/8" to 1-11/16"
• 10,000 or 15,000 psi working pressure (test pressure 15,000 / 22,500 psi)
• Metal-to-metal ball-and-seat seal; high-grade heat-treated steel
• API or proprietary connections; standard and H2S versions
• System components: landing sub, check valve and retrieving overshot

Valve series

Hydraulic testing

Each valve is hydraulically bench tested to API Spec 7-1 (latest edition) and delivered with its individual pressure test record, in two steps:

• Shell test: pressurized to test pressure for 3 minutes, depressurized, then pressurized again for at least 10 minutes
• Seat test: pressurized from the pin end to working pressure for at least 5 minutes

No visible leakage is permitted and the pressure drop must not exceed 1% of the test pressure.

Compatibility with kelly valves