Choke valve with internal sleeve for erosion protection

A method of operating a choke valve assembly, comprising:

• receiving fluid at an inlet body of the choke valve assembly from an upstream flow line;
• flowing the fluid from the inlet body through a choke valve body of the choke valve assembly to an outlet body of the choke valve assembly in response to a choke valve of the choke valve body being open, wherein a sleeve in the choke valve body defines an inner region internal to the sleeve and an outer region external to the sleeve, the outer region comprising an annular cylinder defined by the choke valve body and the sleeve, and wherein flowing comprises flowing, by the sleeve, the fluid through the inner region instead of through the outer region;
• and
• discharging the fluid from the outlet body to a downstream flow line.

A hydrocarbon flow line assembly comprising:

• an upstream flow line to flow well fluids comprising hydrocarbons extracted from a hydrocarbon reservoir in a subterranean zone;
• a choke valve assembly fluidically coupled to an outlet of the upstream flow line to receive the well fluids from the upstream flow line, the choke valve assembly comprising a sleeve positioned in an inner region of the choke valve assembly, the sleeve defining an inner sleeve region in the inner region internal to the sleeve and an outer sleeve region in the inner region external to the sleeve, the outer sleeve region sharing a central axis with the inner sleeve region, wherein the sleeve to flow the fluids through the inner sleeve region instead of the outer sleeve region;
• and
• a downstream flow line downstream of the choke valve assembly to receive the well fluids from an outlet of the choke valve assembly.