Electrical submersible pump system having high temperature insulation materials and buffered lubricant

An electric submersible pumping system comprising:

• a pump;
• an electric motor coupled to the pump, the electric motor having a stator containing a plurality of slots;
• a poly alpha olefin (PAO) lubricant contained in the motor;
• a seal and equalizer section located between the pump and the motor for reducing a pressure differential between the lubricant in the motor and wellbore fluids on an exterior of the motor;
• magnet wires threaded within various ones of the slots for each phase of the motor, each of the magnet wires having at least one insulation layer formed of a polyimide;
• an epoxy surrounding and bonding the magnet wires within the slots;
• a slot insulation comprising a sheet of polyimide film surrounding all of the magnet wires within each of the slots;
• and
• a buffer contained in the lubricant for dissipating amino acid generated by the epoxy to avoid damage to the insulation layer on the magnet wires and the slot insulation.

An electric submersible pumping system comprising:

• a pump;
• an electric motor coupled to the pump;
• a power lead receptacle mounted to a housing of the motor;
• the motor having a stator having a plurality of slots, each of the slots having a bundle of magnet wires;
• a polyimide film adhered to a conductor of each of the magnet wires by adhesive;
• each of the magnet wires extending above the stator and having an electrical terminal on an upper end that releasably connects to the receptacle, each of the magnet wires extending through selected ones of the slots to the electrical terminal without any splices;
• a plurality of tubes formed of an insulation material and having a lower end at an upper end of the stator and an upper end at the receptacle, each of the tubes surrounding one of the magnet wires;
• a slot insulation surrounding at least a portion of each of the bundles in the slots, the slot insulation comprising a sheet of polyimide film;
• an end bell area on a lower end of the stator where the magnet wires protrude past the lower end of the stator in loops, the loops of magnet wire being grouped into phases;
• an end bell insulation sleeve comprising a sheet of polyimide extending around the loops of magnet wire;
• and
• inner and outer phase-to-phase insulation sleeves extending between each of the phases, each of the cylinders comprising a sheet of a polyimide;
• a poly alpha olefin (PAO) lubricant contained in the motor;
• and
• an acid dissipating buffering additive contained in the lubricant.