d.durante4486
Junior Member

Hi everybody,
I'd like to know if anybody has ever considered in its design the possibility of installing a set of two choke valves in series on a XT, namely a non-regulating choke valve, whose opening should be sized to reduce the well pressure to a desired value, followed downstream by a traditional flow control choke valve.

Which are the advantages of such a configuration? Has it something to do with hydrate formation control?

I'm asking this because in Chapter 5 of "Lease Pumper's Handbook" it is reported that "Permitting this pressure reduction to occur in two steps instead of one can reduce the possibility of the line freezing", but since the cooling of the fluid across the choke is due to the Joule-Thomson cooling effect, I think that no matter in how many steps I reduce the pressure from P1 to P2, the final T2 should be the same (I'm moving along the same isoenthalpic curve).

Thank you in advance for your help..

David