Choke and kill manifolds are key surface systems in well control. The choke manifold controls well flow and surface pressure during shut-in, circulation, and pressure-control operations. The kill manifold provides a controlled path for pumping heavy drilling fluid or kill fluid into the well.
A choke manifold typically includes manual or hydraulic choke valves, gate valves, pressure gauges, flanged or union connections, and high-pressure pipework. Fixed chokes and adjustable chokes may be selected according to the well-control procedure.
A kill manifold is connected to the BOP stack through kill lines. It must be rated for the expected working pressure and compatible with the well fluid, temperature, and sour-service environment.
For international projects, choke and kill manifolds are commonly specified to API 16C. Selection should define nominal bore, working pressure, end connection, material class, temperature class, PSL, PR level, and NACE MR0175 requirements when H₂S is present.
