Corrosion aging wear failure of packing

Sealed packing (mainly dynamic sealing) is the weakest link in the gas wellhead, and it is a key component with short life, easy damage and easy to cause serious consequences. Due to the relative movement of the packing and the stem, the H2S and other media cause corrosion, environmental temperature changes cause aging, and the packing is working under high stress conditions, which easily causes the packing to fail. Some packings have a service life of several months, a few days, and some have been used for many years. Packing wear is generally adhesive wear. The aging of the sealed packing is mainly due to the long use time and high temperature.
Due to the temperature change, the packing root which is originally under high stress generates additional temperature stress, which causes fatigue, accelerates aging, and lowers the elastic recovery, generates cracks, becomes brittle, and forms permanent deformation. Which type or modes do you have for the failure of the packing? The relationship between aging and corrosion and wear: aging may accelerate corrosion and wear, and vice versa will promote aging. In addition, the relationship between the material and processing technology of the packing has to be further studied.

In summary, the failure mode of the gas production wellhead device is directly affected by the structural design, the material of the component parts, the manufacturing process, the working conditions and the characteristics of the reservoir. The reasons are complicated. In the operation process, the gas wellhead device is damaged by sand, wax, gas, water, oil and various corrosive media and stress, resulting in various failures of the equipment, including strength, fatigue, wear, fracture, corrosion, Aging, etc., under certain conditions, a certain failure mode may be more prominent.

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