Wells – Central chamber sealed with respect to prepositioned...
Patent
1992-02-10
1994-05-10
Melius, Terry Lee
Wells
Central chamber sealed with respect to prepositioned...
166141, 166242, 277125, 277DIG3, E21B 3310, F16J 1516
Patent
active
053099931
ABSTRACT:
A sealing apparatus is provided for sealing between concentric relatively moveable tubular members. The sealing apparatus is comprised of a plurality of retainer seal rings, made of a high temperature thermoplastic, and between each retainer seal ring is a thermoplastic seal ring constructed of a normal temperature service thermoplastic. The thermoplastic seal rings are alternately spaced with the high temperature thermoplastic retainer seal rings. The retainer seal rings and the thermoplastic seal rings are cylindrical rings having a radial cross-section of a general chevron shape. Energization to press both sets of seals into sealing engagement with the two relatively moveable tubular members is accomplished by the interaction of an axial interference fit between alternating seal rings, a diametrical interference fit between the relatively moveable wellbore surfaces and the seal rings, and wellbore fluid pressure. Wellbore fluid pressure pushes against the female portion of the general chevron shape to flare outward the retainer seal rings into sealing engagement with the relatively moveable tubular members. At higher wellbore temperatures, the retainer seal rings, which are alternated every other one with the thermoplastic seal rings, maintain the shape of the thermoplastic seal rings so that they will sealingly engage the relatively moveable members when the seal assembly is cooled from higher wellbore temperatures to lower wellbore temperatures.
REFERENCES:
patent: 3351350 (1967-11-01), Shepler
patent: 3467394 (1969-09-01), Bryant
patent: 3627337 (1971-12-01), Pippert
patent: 4050701 (1977-09-01), Webb
patent: 4234197 (1980-11-01), Amancharla
patent: 4406469 (1983-09-01), Allison
patent: 4415169 (1983-11-01), Kim
patent: 5131666 (1992-07-01), Hutchens
Coon Robert J.
Hopmann Mark E.
Jennings Steve
Baker Hughes Incorporated
Handley Mark W.
Hunn Melvin A.
Melius Terry Lee
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