Removable non-metallic bridge plug or packer

In combination, a substantially nonmetallic packer or bridge plug for a downhole tubular, comprising:

• a mandrel having an outer surface;
• a sealing element;
• a plurality of slips movable on at least one cone between a retracted and a set position;
• a locking member to hold said slips in said set position with said sealing element compressed against the tubular;
• an initial ring structure comprising said slips and holding said slips in relative position;
• said slips separate from each other, breaking said ring structure as said slips advance on said cone.

In combination, a substantially non-metallic packer or bridge plug for a downhole tubular, comprising:

• a mandrel having an outer surface;
• a sealing element;
• at least one slip movable on at least one cone between a retracted and a set position;
• a locking member to hold said slip in said set position with said sealing element compressed against the tubular. a non-metallic anti-extrusion assembly which expands to the tubular to provide full bore anti-extrusion protection above and below said sealing element;
• said assembly further comprises:
• a plurality of longitudinally slotted rings with offset radial gaps, said rings expand radially when compressed axially.

In combination, a substantially non-metallic packer or bridge plug for a downhole tubular, comprising:

• a mandrel having an outer surface;
• a sealing element;
• at least one slip movable on at least one cone between a retracted and a set position;
• a locking member to hold said slip in said set position with said sealing element compressed against the tubular;
• a non-metallic anti-extrusion assembly which expands to the tubular to provide full-bore anti-extrusion protection above and below said sealing element;
• said anti-extrusion assembly further comprises:
• a plurality of beveled rings which are designed to be bent toward a flattened position into contact with the tubular upon axial compression said beveled rings comprise a plurality of radial slots to facilitate said bending;
• said beveled rings further comprise at least one tab so located so as to rotationally lock one beveled ring to the adjacent ring by extending into the radial slot thereof.

In combination, a substantially nonmetallic packer or bridge plug for a downhole tubular, comprising:

• a mandrel having an outer surface;
• a sealing element;
• at least one slip movable on at least one cone between a retracted and a set position;
• a locking member to hold said slip in said set position with said sealing element compressed against the tubular;
• and
• said mandrel comprises an extending segment on at least one end thereof to allow one mandrel of a partially milled or drilled plug or packer to drop and to lock into another mandrel which is still fixed to a tubular in a multiple unit installation so that drilling or milling out of the partially milled plug or packer is facilitated by rotationally locking mandrels.

In combination, a substantially non-metallic packer or bridge plug for a downhole tubular, comprising:

• a mandrel having an outer surface;
• a sealing element;
• at least one slip movable on at least one cone between a retracted and a set position;
• a locking member to hold said slip in said set position with said sealing element compressed against the tubular;
• and
• a metallic setting tool to create relative movement to set said slip and compress said sealing element, said setting tool releasable from said mandrel for retrieval while bringing with said setting tool portions thereof previously connected to said mandrel and severed during the set.