Corrosion damage behaviors of rubber O-rings under simulated acid fracturing conditions  

作　　者：Dezhi Zeng Yang Zhong Dayong Cao Peng Zhao Tuanhui Fu Yadong Qi 

机构地区：[1]State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan,610500,China [2]Southern Sichuan Aerospace Energy Technology Ltd.,Luzhou,Sichuan,646000,China [3]Tianjin Branch,CNPC Logging,Tianjin,300280,China [4]Research Institute of Bohai Petroleum,Tianjin Branch of CNOOC Limited,Tianjin,300459,China

出　　处：《Petroleum》2023年第2期248-254,共7页油气（英文）

基　　金：Project supported by the National Natural Science Foundation of China“Study on the mechanism of force-chemical damage of screw sealing surface of H_(2)S/CO_(2)gas well completion string under static load,vibration and corrosion”(No.51774249);Sichuan Science and Technology Program(No.21JCQN0066).

摘　　要：To explore the damage behavior of O-ring in acid environment,a high-temperature and high-pressure(HTHP)autoclave was used to simulate the service environment of O-ring,and then 168h corrosion test of hydrogenated nitrile butadiene rubber(HNBR)and fluororubber(FM)O-rings were carried out.The corrosion damage behaviors of two kinds of rubber O-rings in the acidizing fluid were studied through determining their tensile strength,elongation at break,hardness,permanent compressive deformation,tensile fracture morphology and sealing property.The results showed that the crosssectional area and the compression permanent deformation increased,the tensile strength and hardness decreased when the HNBR and FM O-rings under the free state were subjected to acid corrosion.The elongation at break of HNBR decreased,and that of FM rubber increased greatly.Similar with free state,the HNBR and FM O-rings under sealed state also presented the same variation trend.The decrease in the reliability of the O-rings under the sealed state was less significant than that in the free state.In the test,tensile fractures were mostly brittle fractures,HNBR and FM O-rings had obvious corrosion damages such as deformation and swelling.The results could provide a technical basis for the selection of sealing materials,tool optimization design,and construction work in oil and gas fields.

关 键 词：Acid fracturing condition HNBR FM O-RING Damage behavior 

分 类 号：TE35[石油与天然气工程—油气田开发工程]