Seal and seal assembly for well tools

A well tool seal for sealing between spaced surfaces consisting essentially of:

• about 42% poly tetrafluoroethylene;
• about 2% copolymer having a tetrafluoroethylene backbone with a fully fluorinated alkoxy side chain;
• about 29% poly arylene ketone;
• and
• about 27% carbon fiber having a tensile strength of 200,000 pounds per square inch, a tensile modulus of 25,000,000 pounds per square inch, and a density of 0.072 pounds per cubic inch.

A well tool seal for sealing between spaced surfaces consisting essentially of:

• about 35%-49% poly tetrafluoroethylene;
• about 2%-5% copolymer having a tetrafluoroethylene backbone with a fully fluorinated alkoxy side chain;
• about 25%-36% poly arylene ketone;
• and
• about 20%-30% carbon fiber having a tensile strength of 200,000 pounds per square inch, a tensile modulus of 25,000,000 pounds per square inch, and a density of 0.072 pounds per cubic inch.

A well tool seal for sealing between spaced surfaces comprising a composite consisting essentially of:

• 39% to 52% fluorocarbon resins;
• 25% to 36% poly arylene ketone;
• and
• 20% to 30% carbon fibers.