CO2 Corrosion Resistance Test and Applicability Evaluation
of Rubber O-ring

doi:10.11885/j.issn.1674-5086.2013.09.11.05

Abstract

Abstract:

In the high CO2 oil and gas field operations，the applicability of rubber O-ring has a certain effect on the production
safety. Previous studies related to the rubber O-ring is merely in a free state，but in the actual operating condition，the rubber
O-ring is mostly in a compressive stress state. Therefore，we designed a new device for corrosion resistance and sealing property
test of rubber seals in a compressive stress state，in the harsh environment with pressure of 35 MPa，temperature of 140 ℃，gas
phase composition of 5%CO2 and 95%N2，and the CO2 corrosion resistance experiments on the O-rings of four kinds of rubber
materials were conducted. Through comparing the mechanical properties and morphology changes before and after corrosion，
the applicability evaluation of them in the above experiment environments was made. The study found that the mechanical
properties of O-rings after corrosion decreased. The corrosion extent of O-rings was weaker in the compressive stress state than
in the free state，and in the compressive stress state，the liquid corrosion was weaker than the gaseous corrosion，but stronger
in the free state. After corrosion the swelling and aging of O-rings occurred，which caused the seal failure. The study provided
references for the selection and use of rubber seals in the high temperature and high pressure oil and gas field with high CO2
content.

Key words: rubber O-ring, CO2, corrosion, compressive stress state, applicability evaluation

Zeng Dezhi1, Li Tan1, Lei Zhengyi2, Cao Dayong3, Shi Taihe1. CO2 Corrosion Resistance Test and Applicability Evaluation
of Rubber O-ring[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.09.11.05.

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