VAM Book - VAM Services

The step may cause:
⇨ turbulence which may lead to erosion when the well flows,
⇨ drift issues,
⇨ damage of the lowest D1 by internal tools in the well.
VAM connections are only interchangeable with VAM connections from the
same family. They cannot be mixed with API connections, copycat
connections, competitor's connections and connections from other VAM
designs.
This does not mean that they cannot be screwed together. In some cases
they will screw together but will not work correctly and will fail in service.
This could lead to harm to people and the environment.
Connections with the suffix Nx where 'x' is a sequential letter (A,B,C….) are
not interchangeable with the standard product line for the same family.
(except some particular cases). N: Not interchangeable.
Connections with the suffix Kx where 'x' is a sequential letter (A,B,C…) are
interchangeable with the standard product line for the same family. K:
Kompatible; interchangeable.
Even connections which are interchangeable may not always be mixed as
a large difference in weight or steel grade could induce derating on
performances or problems of torque determination.
2.9.3 Specific rules for VAM connections
2.9.3.1 VAM TOP and derivates
Generally:
⇨ VAM TOP Tubing is in sizes 2 3/8" to 4 1/2"
⇨ VAM TOP Casing is in sizes 5" to 14"
Many connections from the VAM TOP family are interchangeable. See table
below for details.
VAM TOP Tubing interchangeability
Errata
There is limited interchangeability of VAM TOP Tubing across the weight
range. The different designs types are shown in the table below. If different
weights are mixed within each group there will be a step in the bore.
vii 24 th August 2011