VAM^® MUST is a flush premium casing for shifting salt domes and high collapse applications. As VAM^® MUST has same OD as the couplings of the associated T&C casing for the same drift requirement, it may therefore be inserted in a casing string only in the section of the high collapse pressure area without changing any drilling parameters. VAM^® MUST is the reference for salt dome applications.

Applicable range

• VAM MUST is available from 5 1/2" to 10 3/4"
• Wall thickness corresponding to the coupling stock of the associated string
• Carbon steel
• Yield strengths from 80 ksi to 110 ksi in particular

Integral flush design

• VAM^® MUST is an integral connection threaded on coupling stock mother pipes with the OD of the couplings of the casing string used. Typically 10 ¾" OD with 9 5/8" strings or 7 5/8" OD for 7" strings.
• 100% tension joint efficiency under tension compared to the associated T&C casing string

Multiple Seal System

• An external seal and an internal seal work independently of each other to achieve sealing against internal pressure and external pressure up to 100% of the rated burst and collapse for the coupling stock mother pipe body.

Improved Thread Design

• Thread load flank has a 9° reverse angle to resist jump-out.
• Thread stabbing flank has a 20° angle for fast, trouble-free make-up.

Internal Reverse Angle Torque Shoulder

• The reverse angle torque shoulder provides a positive torque stop, which allows accurate power tight make-up.
• The reverse angle of the shoulder increases the internal seal contact pressure achieving excellent gas tightness under internal pressure.
• The combination of the reverse angle torque shoulder and the 9° load flank of the threads creates a "wedge" effect which improves the structural strength of the connection.

Streamlined Internal and External Profile

• The OD and ID is 100 % flush (no upset).
• The ID is bored and recess-free for smooth, efficient flow.
• The OD is turned to tight tolerance.