Slip Joint,DST tools，

Slip Joint Features & Benefits: The slip joint is an expansion and contraction compensating tool, It accommodates any changes in string length caused by temperature and pressure during a downhole test. The slip joint has two distinct parts: an outer housing and a moving inner mandrel. A slip joint operates by balancing its volume. As the slip joint stretches and increases its internal volume, a differential piston within the slip joint allows the same volume of fluid into the