The Medium Duty Packer is our most popular sliding-end packer. It is a versatile tool for a wide range of hole sizes and depths. Standard construction includes aluminum, steel or stainless steel metal parts and a reinforced natural rubber element; however, special oil resistant covers and all stainless steel metal parts can be ordered. It has the following features:

      • Large expansion ratio and high differential pressure rating.
       • Borehole sizes ranging from 2" to 30" (50 to 760 mm).
       • 500 psi (35 bar) unconfined to 1,000 psi (70 bar) confined pressures.

For example, a 3.6 inch O.D. Medium Duty Packer can seal a 6 inch hole with a 500 psi differential pressure rating, allowing it to be set at 1,000 feet and used for pump testing. The same packer has a differential pressure rating of 1,500 psi in a 4.5 inch hole, permitting injection tests up to 1,500 psi over the hydrostatic. 
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      • Cost-effective solution for moderate expansion ratio applications.
       • Ideal for low permeability testing requiring a low-compliance packer.
       • Used in rock stress work requiring a high-pressure, strong straddle packer assembly.

A fixed-end packer has both of the rubber element ends fixed to the pipe mandrel. The element can be one of three styles: non-reinforced, partially-reinforced, or fully reinforced. Non-reinforced or "balloon" type packers can easily fail due to element extrusion into open borehole fractures or into the annular area between the packer ends and the casing or borehole. Partial reinforcement at the ends of the element prevents extrusion into the annular area near the packer ends, but the element can still extrude into borehole fractures. In 1993, Baski Inc. introduced the fixed-end ReFlex^TM packer with a fully-reinforced element to prevent extrusion problems.
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