Wellhead Pressure Control Equipment API 16C Choke Manifold, Valve
Assembly
Choke manifold is 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 prevent the 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.
Assembly & structure
Choke manifold consists of choke valve, gate valve, pipeline,
fittings and pressure gauge etc.
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 when the casing pressure is quite high.
Specification
Pressure level is divided into five levels, 2000psi, 3000psi,
5000psi, 10000psi, 15000psi; it can be designed according to the
requirement of client.
Choke manifold is according to the requirement of API Spec 16C.
Working Pressure: 20000psi~15000psi
Nominal Bore Size: 2 1/16’’~4 1/16’’
Operation Requirement
* All the working pressures of parts in choke manifold should be
matched with the working pressure of the BOP stack used;
* 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
the rated working pressure;
* Pipeline should be as smooth and straight as possible, the corner
of the pipeline should be made of 120 shaped forged steel bent
pipe, which should have adequately large bore;
* The working pressure gauge should be installed;
* In winter, the choke manifold should be able to work under a low
temperature condition.
| Name | Choke manifold |
| Type | JG/S2-35 | JG/SY-35 | JG/SY2-70 |
Main and side outlet bore
in (mm) | 31/8×21/16(80×52) 41/16×29/16(103×65) 41/16×31/16(103×78) |
Nominal pressure
psi (Mpa) | 3000 (21), 5000 (35) | 3000 (21), 10000 (70) |
Working temperature
℃(°F) | LU -46℃ ~ +121℃ (-50°F ~ 250°F) |
| Working medium | Drilling fluid, mud, oil (sour oil) |
| Controlling form | Dual-Wing manual choke valve | Dual-Wing fluid manual choke valve | Tri-Wing fluid manual choke valve |
