Well packers
Patent 4505332 Issued on March 19, 1985. Estimated Expiration Date: 
October 21, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 21, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3098524 3211226 3299959 3414058 3658127 Hydraulically set well packer Patent #: 4311195 InventorsApplicationNo. 06/435675 filed on 10/21/1982US Classes:166/120, Anchor actuated by fluid pressure166/134, Support and holddown expanding anchors166/387With sealing feature (e.g., packer)ExaminersPrimary: Novosad, Stephen J.Assistant: Bui, Thuy M. Attorney, Agent or FirmInternational ClassesE21B 33/12 (20060101)E21B 33/122 (20060101) E21B 33/1295 (20060101) AbstractThere is disclosed a dual well string, hydraulically operated, retrievable packer in which one mandrel connectible with one well string is releasably connected to the body means of the packer to permit it to be lowered therewith, and the other mandrel connectible to the other well string is vertically reciprocable with respect to the body means and thus with respect to the first-mentioned mandrel. The packing element and slip assembly of the packer are supported on and carried about a first body section, and a second body section includes an expander plate which is movable relative to the first body section to expand the packing element and the slip assembly into engagement with the well bore by means of a hydraulically actuated mechanism including pistons reciprocable within cylinders formed in the first body section and connected to the expander plate by means of a pair of rods. One such rod has a through bore which permits circulation between a tubular member connected to its upper end and the annulus within the well bore beneath the packer, and the other rod has a bore which is open at its lower end to permit the supply and exhaust of hydraulic fluid to and from the cylinders.Other References
Field of SearchAnchor actuated by fluid pressurePressure transmitted by cup type packer or plug seal Pressure transmitted by packer or plug expanded by confined fluid from central chamber, pump, or plunger Support and holddown expanding anchors PLURAL WELLS Fluid pressure actuated Providing support for well part (e.g., hanger or anchor) With sealing feature (e.g., packer) | |
