초록 ▼

An improved downhole tool apparatus and method for limiting the extrusion of packer element seals of packers and bridge plugs which utilize segmented packer retaining shoes when such tools are of larger diameters, or when used at elevated differential pressures or elevated temperatures. Preferably t

An improved downhole tool apparatus and method for limiting the extrusion of packer element seals of packers and bridge plugs which utilize segmented packer retaining shoes when such tools are of larger diameters, or when used at elevated differential pressures or elevated temperatures. Preferably the segmented packer shoes incorporate a plurality of gap-bridging disks to limit if not eliminate unwanted extrusion of the packer elements upon setting of the tool. By making the packer element shoes and disks of non-metallic material, the subject invention increases the ability to drill or mill downhole tools out of a well bore in less time than it would take with using conventional or non-conventional drilling or milling techniques or equipment while providing enhanced high temperature and high pressure performance, especially in larger nominal outside diameter downhole tools.

대표청구항 ▼

A downhole apparatus for use in a wellbore comprising: a) a mandrel having an axial centerline; b) a slip means disposed on the mandrel for grippingly engaging the wellbore when set into position; c) at least one packer element to be axially retained about the mandrel and located at a preselected po

A downhole apparatus for use in a wellbore comprising: a) a mandrel having an axial centerline; b) a slip means disposed on the mandrel for grippingly engaging the wellbore when set into position; c) at least one packer element to be axially retained about the mandrel and located at a preselected position along the mandrel defining a packer element assembly; d) at least one packer element retaining shoe made of a plurality of segments for axially retaining the at least one packer element about the mandrel, the shoe segments further having a cavity for accommodating at least a portion of at least one shoe segment to shoe segment gap-spanning structural member; e) at least one shoe segment to shoe segment gap-spanning structural member installable into the cavity; and f) means for retaining the shoe segments in an initial position about the mandrel; wherein the shoe segment to shoe segment gap-spanning member is of such size and configuration to span a gap that forms between adjacent shoe segments upon the tool being set in the wellbore.