The effect of aging in real time on the mechanical, chemical and kinetic properties of copolymer ethylene propylene diene monomer rubber (EPDM) was quantified, after being exposed to real operating conditions in the artificial petroleum lift system, from the Peregrino field. (managed by Equinor Brasil Ltda.). The EPDM rubber was collected from part of the mechanical protection cover (Jacket) of the electrical supply cables of the electro-submersible pumps (ESP). The study involves samples from 0, 2 to 4.8 years old and with depths ranging from 0, 760 to 2170 m below sea level. The aging was followed by studies of infrared spectroscopy techniques by Fourier transform (FTIR) assisted with attenuated total reflection (ATR), SEM electron microscope, along with energy dispersion X ray spectrometer (EDX), simultaneous thermal analyzer (STA), reticulation fraction measurement, hardness (Shore D scale), uniaxial traction tests and adsorption tests in the protection fluid (Parker-fluid plus safe-Scan). The stability of EPDM rubber was studied by non-isothermal methods such as: Kissinger-Murray-White (KMW), Ozawa-Flynn-Wall (OFW), Friedman (FR), combined kinetic analysis (CKA) and correction of the combined kinetics analysis by isoconversion (CKA-ic). A 5 per cent oscillation in the apparent activation energy (E equal248 kJ/mol) during the thermal degradation of the material in N2, shows a reaction that produced a reaction order (n equal 0.93), a pre-exponential factor (A equal ln(40 /min-1)) and indicates that the material does not suffer hydrolytic attack or oxidation degradation observed in aging tests in the presence of water and compression. On the other hand, the properties of the uniaxial tensile test show sensitivity to the depth of the samples, which may well indicate degradation of amorphous areas of EPDM, a product of high temperatures and pressures in the deposit.