The Principle of the Choke Manifold

For the choke circulation or the well killing, the choke valve holds the flow of fluid inside to control the wellhead backpressure (the oil pressure and the casing pressure) and to maintain the bottom pressure equal to or slightly greater than that of the formation. For the pressure relief, it degrades the wellhead pressure and achieves a "soft shut-in". For diversion and blow-off, it reduces the surface casing pressure, protects the blowout preventer and diverts the overflow away from the well site, so as to have a safety ensured downhole operation free from fire and poison.

High pressure inside the well can be controlled by the choke valve (with three types being the manual adjustable, the hydraulic and the fixed) on the choke manifold. The fluid in the well can be released to regulate and even be directly blown off to relieve the casing pressure.

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