Aluminum Mechanical Stage Collars
Designed for mechanical operation only using a free fall opening dart. This tool is only recommended where deviation of the hole above the tool is 25° or less.
Type 681 - Mechanical Stage Collar has been designed for stage cementing operations that require the tool to be opened mechanically. The tool features two internal sleeves that shift during the stage cementing operations. The bottom sleeve is shifted open by dropping an opening dart and allowing it to set on the opening seat. Closing the stage collar is achieved by pumping a closing plug behind the second stage cement and applying pressure upon completing displacement.
Field adjustable opening pressures
Standard tools are furnished with L-80 material suitable for sour gas service
Standard seals are rated for -15°F to +400°F and suitable for sour service and high pressure gas environments
Compatible with most annular casing packers
Robust lock ring design prevents sleeves shifting prematurely