Fluid filled drill pipe plug

Details Fluid filled drill pipe plug Fluid filled drill pipe plug

E - Fixed Constructions

21

B

E21B 33/16 (2006.01)

Patent

CA 2379094

A wiper plug for downhole use is disclosed. It features an inflatable structure that allows it to ride inside tubulars that change or gradually vary in inside diameter. In a preferred embodiment the bladder is actuated by fluid displaced by a biased piston. The piston is capable of moving in opposite directions to allow original insertion into a launcher and subsequent bladder expansion. In another embodiment, the piston can be fluid driven in opposed directions by a pump and an on board control system which can regulate, on a real time basis, the contact pressure of the bladder to a predetermined level or range, as the bladder encounters varying interior wall diameters of the tubular string or associated equipment.

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