| 摘要 |
A well packer and service seal unit for setting the packer in a well bore and depositing a gravel or slurry pack within the well bore. The packer includes a tubular mandrel connectible with a tubing handling string and adapted to support a gravel pack sand screen below the packer, a setting sleeve, top slips, bottom slips, internal slips, and seal elements supported on the mandrel for holding the packer in a well casing against a pressure differential in either direction and sealing with the casing to isolate a producing zone in the well bore. The service seal unit is insertable into the packer for supporting the packer as it is lowered in the well bore, setting the packer, and directing fluid flow to place the gravel or slurry pack in the well bore around the screen below the packer seal elements. The service seal unit includes a top sub, a tubular housing, a cross-over packing sub, a J-slot mandrel, cross-over weldments, an operating cylinder and piston, a setting sleeve, and upper and lower packing mandrels. The service seal unit also includes spring loaded lugs which inhibit the packer from setting if it becomes wedged in the bore hole during installation. The service seal unit is particularly adapted to set the packer by hydraulic pressure. In operation the service seal unit is telescoped into the packer at the surface end of the well bore, supported on the tubing string, and the service seal unit supported packer is then lowered to the proper depth in the well bore where the packer is set by hydraulic pressure applied to the service seal unit through the tubing string. The gravel pack or slurry pack is then pumped through the tubing string and outwardly into the well bore through the service seal unit and packer below the seal elements on the packer. Thereafter the service seal unit is retrieved and a production tubing string is coupled into the packer for producing the well.
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