Annular safety system

An annular safety system for a cased well comprising:

• (a) packer means for anchoring and sealing in said casing, said packer means having outlet ports for flow from inside to outside said packer means;
• (b) a landing nipple having profiled grooving therein connected below said packer means;
• and
• (c) operating seal unit means for operating said packer means to anchor and seal in said casing, said operating seal unit means sealingly engaging and extending through said packer means to form an annular flow passage communicating with said packer means outlet ports, said operating seal unit means including:
• a dual head having primary and secondary well tubing connected thereto,
• a valve permitting downward flow and automatically preventing upward flow in said secondary well tubing,
• a primary flow conduit therein connected to said dual head and having a flow passage communicating said primary tubing through said landing nipple with said well casing below said packer means, said primary flow conduit having a safety valve therein operable to prevent upward flow in said primary conduit,
• lockable locator means on said primary flow conduit for landing and releasably locking in said landing nipple, and said lockable locator means including,
• a housing having openings therethrough,
• a key mounted for radial movement in each opening, each said key having profiled grooving engageable in said landing nipple profiled grooving,
• a longitudinally moveable sleeve in said housing releasably connected on said primary flow conduit, said sleeve having an expander surface thereon,
• spring means between said sleeve and each key,
• releasable means for positioning said sleeve in a first upper position in said housing where said expander is not expanding said keys, said sleeve releasable by downward movement to a second position expanding said keys and further downward to a third position not expanding said keys, and
• annular flow passages therein for communicating said secondary tubing with said annular flow passage through said packer means.

An annular safety system for a cased well comprising:

• (a) packer means for anchoring and sealing in said casing, said packer means having outlet ports for flow from inside to outside said packer means;
• (b) a landing nipple having profiled grooving therein connected below said packer means;
• and
• (c) operating seal unit means for operating said packer means to anchor and seal in said casing, said operating seal unit means sealingly engaging and extending through said packer means to form an annular flow passage communicating with said packer means outlet ports, said operating seal unit means including:
• a dual head having primary and secondary well tubing connected thereto,
• a valve permitting downward flow and automatically preventing upward flow in said secondary well tubing,
• a primary flow conduit therein connected to said dual head and having a flow passage communicating said primary tubing through said landing nipple with said well casing below said packer means, said primary flow conduit having a safety valve therein operable to prevent upward flow in said primary conduit,
• connecting locator means on said primary flow conduit for landing and releasably locking in said landing nipple, said connecting locator means disconnectable on rotation of said operating seal unit means if said connecting locator cannot be released from said landing nipple, said connecting locator means including,
• a housing having openings therethrough and threads therein, a key mounted for radial movement in each opening, each said key having profiled grooving engageable in said landing nipple profiled grooving,
• a longitudinally moveable sleeve mounted in said housing, said sleeve having an expander surface thereon,
• spring means between said sleeve and each key,
• releasable means for positioning said sleeve in said housing in a first upper position where said expander is not expanding said keys, said sleeve releasable by downward movement to a second position expanding said keys and moveable further downwardly to a third position not expanding said keys,
• a collet mandrel releasably connected in said sleeve,
• a collet mounted around said collet mandrel and positioned thereon, said collet having fingers, and each said finger having threads engageable in said housing threads, and annular flow passages therein for communicating said secondary tubing with said annular flow passage through said packer means.

A connecting locator for landing and releasably locking in profiled grooving in a well conduit comprising:

• (a) a housing having openings therethrough and threads therein;
• (b) a key mounted for radial movement in each opening, each said key having profiled grooving engageable in said conduit profiled grooving;
• (c) a longitudinally moveable sleeve mounted in said housing, said sleeve having an expander surface thereon;
• (d) spring means between said sleeve and each key;
• (e) releasable means for positioning said sleeve in said housing in a first upper position where said expander is not expanding said keys, said sleeve releasable by downward movement to a second position expanding said keys and moveable further downwardly to a third position not expanding said keys;
• (f) a collet mandrel releasably connected in said sleeve;
• and
• (g) a collet mounted around said collet mandrel and positioned thereon, said collet having fingers, and each said finger having threads engageable in said housing threads.