Coiled Tubing Deployed ESP With Seal Stack That is Slidable Relative to Packer Bore

An assembly for pumping well fluid from a well, comprising:

• a first electrical submersible pump (“first ESP”) having a pump and a motor, the first ESP adapted to be secured to a string of production tubing and lowered into the well for pumping well fluid up the production tubing;
• a second electrical submersible pump (“second ESP”) having a longitudinal axis and motor located above a pump, the second ESP adapted to be secured to a string of coiled tubing and lowered in the string of production tubing in the event of failure of the first ESP;
• a tubular intake member extending downward from a lower end of the pump of the second ESP;
• a packer carried by the second ESP, the packer having a body with a bore through which the intake member extends in sealing engagement with the bore;
• the intake member having an open lower end below the packer for receiving well fluid flowing upward through the first ESP;
• a sleeve surrounding the body of the packer, the sleeve being of an elastomeric material that swells into sealing engagement with the production tubing in response to contact with well fluid to place the packer in a set position in the production tubing;
• a retainer having a retaining position that initially retains the packer in a fixed axial position with the intake member as the second ESP is lowered into the production tubing;
• and
• wherein the retainer is movable from the retaining position to a released position in response to thermal growth of the coiled tubing relative to the production tubing after the packer is in the set position, enabling the intake member to move downward relative to the bore of the packer.

A method of pumping well fluid from a well, comprising:

• connecting a first electrical submersible well pump (“first ESP”) to a string of production tubing and lowering the production tubing into the well along with an external power cable extending from the motor to a wellhead alongside the production tubing;
• supplying power through the external power cable to the first ESP and in response pumping well fluid up the production tubing;
• then, in the event of a failure of the first ESP, providing a second electrical submersible well pump (“second ESP”) with a packer and a seal member extending sealingly through a bore of the packer;
• lowering the second ESP into the production tubing with a string of coiled tubing having an internal power cable and setting the packer in the production tubing above the first ESP;
• supplying power through the internal power cable to the second ESP and pumping well fluid up the production tubing;
• and
• allowing axial movement of the seal member relative to the packer after the packer has been set in response to thermal growth of the coiled tubing relative to the production tubing.