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The AST Packer is a full opening, setdown packer suitable for squeeze cementing, acidizing, fracturing and many other stimulation procedures. It incorporates many of the features of field proven tools and has several new improvements to enhance tool performance. It features a built in unloader to equalize pressure and hold-down pistons to prevent upward migration with bottom hole pressure.
Features:
- Holds pressure below and above - After the built in unloader closes, pressure can form below the tool. This pressure communicates to the piston housing and forces the pistons outward to the casing. This prevents upward movement of the tool. The bypass is held closed by means of a bypass equalizing system.
- Pressure from above holds against the lower set of slips. The lower slips are dovetail style slips and have more slip area than many other tools now being used.
- The receptacle for the pistons has been reinforced to provide higher differential pressure from above. This eliminates the problem with some tools of the receptacle collapsing and jamming the mandrel. The tool is rated 10,000 psi above and below.
- Dovetail Slips easily retract and are less subject to hanging in cementing collars or well head equipment.
- Release mechanism is tougher than standard tools to prevent damage by obstruction in the well bore or over rotation.
Advantages:
- Releases easily after equalizing - Releases by simply picking up the tubing which equalizes the hold downs and allows them to retract.
- Full opening ID - Openings are noted in specification guide and allow access of most standard wireline tools.
- Holds pressure in either direction - Hydraulic Pistons prevent upward migration of the dove tail slips prevent downward migration.
- Dependable unloader - The Face Seal Style Unloader is field proven and allows internal circulation to remove trash and equalize without a separate unloader.
- Change to left hand set quickly - The AST can be changed by an external adjustment which can be easily done in the field.
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