Choke line:

A pipe attached to the blowout preventer stack out of which kick fluids and mud can be pumped to the choke manifold when a blowout preventer is closed in on a kick.

2. a high-pressure pipe leading from an outlet on the bop stack to the backpressure choke and associated manifold.

During well-control operations, the fluid under pressure in the wellbore flows out of the well through the choke line to the choke, reducing the fluid pressure to atmospheric pressure.

In floating offshore operations, the choke and kill lines exit the subsea bop stack and then run along the outside of the drilling riser to the surface.

The volumetric and frictional effects of these long choke and kill lines must be considered to control the well properly.

Terms Related to Choke line

• Choke manifold

  An arrangement of piping and special valves, called chokes. In drilling, mud is circulated through a choke manifold when the blowout preventers are closed. In ...

• Remote choke panel

  A set of controls, usually placed on the rig floor, that is manipulated to control the amount of drilling fluid being circulated through the choke ...

• Drilling spool

  A fitting placed in the blowout preventer stack to provide space between preventers for facilitating stripping operations, to permit attachment of choke and kill lines, ...

• Choke flow line

  An extension from the blowout preventer assembly used to direct control the flow of well fluids from the annulus to the choke.

• Master choke line valve

  The valve on the choke and flow line that is nearest to the preventer assembly. Its purpose is to stop the flow through the choke ...

• Positive choke

  A choke in which the orifice size must be changed to change the rate of flow through the choke.

• Choke bean

  A device placed in a choke line that regulates the flow through the choke. Flow depends on the size of the opening in the bean; ...