Metal pad for downhole formation testing

Details Metal pad for downhole formation testing Metal pad for downhole formation testing

E - Fixed Constructions

21

B

E21B 49/08 (2006.01) E21B 49/10 (2006.01)

Patent

CA 2417448

Methods and apparatus for isolator pad assemblies used in formation testing equipment. The pad comprises a primarily metallic pad member and a retractable resilient sealing member. The resilient sealing member is maintained in a retracted, protected position until extended to seal against the wellbore. When extended the metallic pad pushes into the mudcake until a raised ring of material on the surface of the pad contacts the formation. Once the pad is in place, the resilient sealing member, which is molded to an extending metal sleeve, is extended and contacts the mudcake to form a primary seal. With the primary and secondary seals energized, a fluid sample can be collected from the formation without contamination from wellbore fluids.

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