Well packer having extrusion preventing rings

Details Well packer having extrusion preventing rings Well packer having extrusion preventing rings

1987-06-10

1988-05-24

Leppink, James A.

Wells

Packers or plugs

With expanding anchor

166138, 166196, 2771162, E21B 33128

Patent

active

047459727

ABSTRACT:
A well packer is shown having an annular packing element surrounded on either side by axially shiftable annular shoulders. Extrusion preventing devices are located between each shoulder and the packing element to prevent extrusion of the packing material during use. The extrusion preventing devices include an outer split ring having a generally triangular cross-section defined by a cylindrical abutment surface for abutment with the outer conduit, a tapered sidewall engageable with one of the shoulders, and a planar surface which is substantially normal to the longitudinal axis of the packer. The planar surface has an innermost radial extent which joins the tapered sidewall and an outermost radial extent which joins the cylindrical abutment surface. The extrusion preventing device also includes an inner split ring of complimentary shape but reversely arranged to the outer ring. The planar surface of the inner ring is provided with a circumferential land which joins the innermost radial extent for engaging the innermost radial extent of the outer ring to prevent extrusion of the packing element past the extrusion preventing device.

REFERENCES:
patent: Re31978 (1985-09-01), McStravick
patent: 2921632 (1960-01-01), Clark
patent: 2921633 (1960-01-01), Baker
patent: 3036639 (1962-05-01), Baker
patent: 3061013 (1962-10-01), Thomas
patent: 3109493 (1963-11-01), Carter
patent: 3229767 (1966-01-01), Urbanosky
patent: 4433726 (1984-02-01), Preston, Jr. et al.
patent: 4611658 (1986-09-01), Salerni et al.
patent: 4688634 (1987-08-01), Lustig et al.

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