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A well packer for use in geothermal wells or stem injection wells. The packer can be anchored to the inner wall of a casing string to resist differential pressure in either direction. The anchoring means includes a single set of slip elements which are hydraulically or mechanically set. The packer i

A well packer for use in geothermal wells or stem injection wells. The packer can be anchored to the inner wall of a casing string to resist differential pressure in either direction. The anchoring means includes a single set of slip elements which are hydraulically or mechanically set. The packer includes a sealing unit with packing elements especially adapted for high temperature wells. The packer can be simply released from the casing by upward tension on the tubing.

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In a packer for forming a seal with the inner wall of a casing string and having a sealing unit carried on a mandrel means, the sealing unit comprising: a. each end element having a partially elliptical cross section with parallel cylindrical inside and outside diameters; b. the major axis of the pa

In a packer for forming a seal with the inner wall of a casing string and having a sealing unit carried on a mandrel means, the sealing unit comprising: a. each end element having a partially elliptical cross section with parallel cylindrical inside and outside diameters; b. the major axis of the partially elliptical cross sections forming an acute angle with the exterior of the mandrel means when the sealing unit is in its first position; and c. the major axis moving towards a position normal to the mandrel means when the sealing unit is in its second position. In a well packer, for sealing between the outside diameter of a tubing string and the inside diameter of a casing string disposed within a well bore, the sealing unit, carried on the exterior of a mandrel means, comprising a center element, end elements, and backup rings wherein: a. the center element is selected from the group consisting of ethlene propylene-diene terpolymer, vinylidene fluoride and hexafluoropropylene copolymer, and polytetrafluoroethylene; and b. the end elements are selected from the group consisting of vinylidene fluoride, hexafluoropropylene copolymer, asbestos, graphite, and ceramic fibers with each being reinforced by wire mesh.