초록 ▼

A geothermal wellhead repair unit including a mechanically set packer to isolate the wellhead for removal and repair thereof. The packer is run into the well string using a running tool. The packer is set by placing tension on the mandrel to set the packing elements and the slip assembly. Once the p

A geothermal wellhead repair unit including a mechanically set packer to isolate the wellhead for removal and repair thereof. The packer is run into the well string using a running tool. The packer is set by placing tension on the mandrel to set the packing elements and the slip assembly. Once the packer is set, the running tool can be disengaged without gear of collapsing the packer and the wellhead removed for repair or replacement. Upon replacement of the wellhead, the running tool can be used to unset and retrieve the packer.

대표청구항 ▼

A well packer settable and retrievable within a well bore using a running tool to selectively isolate the wellhead, said packer comprising: an inner mandrel; a sleeve assembly releasably attached to said inner mandrel by first latching means, said sleeve assembly selectively detachable from said man

A well packer settable and retrievable within a well bore using a running tool to selectively isolate the wellhead, said packer comprising: an inner mandrel; a sleeve assembly releasably attached to said inner mandrel by first latching means, said sleeve assembly selectively detachable from said mandrel for longitudinal movement of said mandrel in a first direction relative to said sleeve assembly to set said packer; a connector sub detachably connected to an upper end of said mandrel by second latching means, said connector sub attached to the running tool; locking ratchet means to selectively prevent longitudinal movement of said mandrel in a second direction relative to said sleeve assembly to unset said packer, said ratchet means being selectively unlockable to allow longitudinal movement of said mandrel in said second direction relative to said sleeve assembly to unset said packer for retrieval thereof; and an equalizing fluid passageway selectively operable to provide fluid communication above and below said sleeve assembly; said sleeve assembly including at least one packing element selectively compressible into sealing engagement with the well bore, at least one slip selectively engageable with the well bore, and drag block means engaging said well bore to facilitate setting of said at least one packing element and at least one slip to set said packer within the well bore; said connector sub selectively detachable from said mandrel to leave said packer in the well bore, tension applied by the running tool to said sub being transmitted to said mandrel for closing said equalizing fluid passageway and setting said packer, said sub reconnectable to said mandrel for opening said passageway, release of said locking ratchet means and retrieval of said packer.