Choke manifold is a necessary device to control the well kick successfully and execute the pressure
control technology on oil/gas well in the course of drilling, as it is, the device is adopted to execute
new drilling well’s technique of balance pressure, which can avoid pollution of oil-layer, improve the
speed of drilling and control blowout effectively. One end of the device connects with the side flange
of BOP spool. When BOP closes, it can control the finite pressure from casing by adjusting the choke
valve’s opening, so balanced drilling can work under minimum pressure-difference.
2. Assembly & structure
Choke manifold consists of choke valve, gate valve, pipeline, fittings and pressure gauge, etc. You
will find them in the following drawing.
3. Working principle
When the pressure rising in well, fluid in well can be released in utilization of the choke valve
opening/closing in choke manifold to control casing pressure, which can directly blow out through
gate valve as the casing pressure is quite high.
Pressure level is divided into five levels, such as 14MPa (2000psi), 21MPa (3000psi), 35MPa
(5000psi), 70MPa (10000psi) and 105MPa (15000psi). It can be also designed according to
customers’ specific requirements.
5. Operation requirements
(1) All working pressures of parts in choke manifold should be matched with the working pressure of
the BOP stack used;
(2) Choke manifold should be installed at the place where operator approach it conveniently, pressure
test should be executed as installation, while the sealing test pressure should be equal to