Inflation shape control system for inflatable packers

Details Inflation shape control system for inflatable packers Inflation shape control system for inflatable packers

1996-01-11

1997-02-25

Dang, Hoang C.

Wells

Processes

Placing or shifting well part

166187, E21B 33127

Patent

active

056051956

ABSTRACT:
An inflatable packer used in a well and having a mandrel carrying upper and lower heads, a normally retracted inflatable packer element including an inner elastomer bladder and an outer expansible armor or carcass, the ends of the packer element being anchored to respective heads, and in one embodiment a hydraulically operable system that applies restraining force to the heads which controls the shape and deployment of the packer element during inflation and prevents entrapment of fluid bubbles outside the element and the formation of Z-folds in the bladder. In other embodiments the restraining force is supplied by a stack of disc springs, by frictional engagement between parts, by a shearing action of materials, by swaging a sleeve member, and by axially crushing a sleeve member.

REFERENCES:
patent: 2828823 (1958-04-01), Mounce
patent: 3134441 (1964-05-01), Barry et al.
patent: 3524503 (1970-08-01), Baker
patent: 3941190 (1976-03-01), Conover
patent: 4951747 (1990-08-01), Coronado
patent: 5417289 (1995-05-01), Carisella
patent: 5469919 (1995-11-01), Carisella

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