Drill Stem Testing Tools Sleeve Type Drain Valve For Well Testing

The Sleeve Type Drain Valve is used in drill stem testing service and installed between any two valves that may come out of the hole with pressure or fluid trapped between them. Pressure is relieved by installing the drain collar and drain nipples on the drain valve. Valves, lines, or sample bottles may be attached to the drain nipples depending on the desired disposition of the fluid in the string. After the drain collar assembly is attached, the ports in the tool are exposed by using a chain wrench or pipe wrench to rotate the drain nut, which moves the
sliding sleeve.

When the ports in the sleeve are aligned with the ports in the body of the tool, the fluid may be drained.It is also possible to trap a large volume fluid sample between two valves if a sample chamber of some kind (tubing, drill collar,etc.) is placed between the valves. In most cases, the drain valve would be run at the bottom of the sample chamber to facilitate transfer. This will not be a PVT sample.
 

Technical parameter of Sleeve Type Drain Valve