Patent ID: 11885196
Assignee: CHINA NATIONAL PETROLEUM CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A retrievable packer system, comprising:
a packer mandrel having an upper mandrel end and a lower mandrel end;
a lock ring being attached to said packer mandrel at said upper mandrel end and having an unlocked position on said packer mandrel relative to said lower mandrel end and a locked position relative to said lower mandrel end, said locked position being closer to said lower mandrel end than said unlocked position, said lock ring being removably attached to said packer mandrel at said locked position;
an upper cone mounted on said packer mandrel between said lock ring and said lower mandrel end;
a lower cone mounted on said packer mandrel between said upper cone and said lower mandrel end,
wherein said lower cone is comprised of:
a lower cone tip end facing said upper cone;
a lower cone base end opposite said lower cone tip end; and

a slip device being between said upper cone and said lower cone and being in sliding engagement with said upper cone and said lower cone,
wherein said slip device is comprised of an inner engagement surface facing said upper cone and said lower cone and an outer engagement surface opposite said inner engagement surface, said slip device having slip flow channels from said inner engagement surface to said outer engagement, and
wherein said slip device has a run-in position with said outer engagement surface at an initial distance from said upper cone and said lower cone and a set position with said outer engagement surface at an extended distance from said upper cone and said lower cone, said extended distance being greater than said initial distance so as to hold position of said packer mandrel in a borehole;
a retrieval mandrel being mounted on said packer mandrel between said lower cone and said lower mandrel end and having a connection end facing said lower cone; and
a slotted retrieval sleeve being mounted to said retrieval mandrel and extended into said lower cone and being comprised of an anchor end attached to said retrieval mandrel, a push end opposite said anchor end, and a plurality of slots, each slot of said plurality of slots have an open slot end at said push end and flow end opposite said open slot end;
an upper connection sleeve placed on said packer mandrel above said lock ring; and
a lower connection sleeve being placed around said packer mandrel between said lower cone and said lower mandrel end so as to form a chamber with said lower connection sleeve, said lower cone, said retrieval mandrel, said slotted retrieval sleeve and said packer mandrel, said chamber being in fluid connection with slip flow channels.