During CO_(2)transportation and storage,metal equipment such as oilfield pipelines suffers from severe CO_(2)corrosion,especially in harsh downhole injection equipment.In this study,we investigated the corrosion behav...During CO_(2)transportation and storage,metal equipment such as oilfield pipelines suffers from severe CO_(2)corrosion,especially in harsh downhole injection equipment.In this study,we investigated the corrosion behavior of oil well tubing in a high-temperature,high-pressure(HTHP)CO_(2)-containing environment.The evolution of the corrosion scale was also examined under different flow regimes.The results reveal a lower corrosion rate at 150℃compared to 80℃under different flow regimes,with localized corrosion intensifying as temperature and rotational speeds(vrs)increase.The temperature also induces the corrosion scale conversion of aragonite-type CaCO_(3)(80℃)to calcite-type CaCO_(3)(150℃).Specifically,the variation of the corrosion rate and the corrosion scale evolution can be attributed to the vortices within the reactor.The intact vortex cells enhance mass transfer while also promoting nucleation and growth of CaCO3.However,when vrsexceeds the critical Reynolds number,the vortex cells are disrupted,resulting in viscous dissipation and a reduced corrosion rate.展开更多
基金supported by the National Natural Science Foundation in China(52434002,42176209,52074339)the Natural Science Foundation of Shandong Province(ZR2021ME007)+1 种基金the Opening Fund of Shandong Key Laboratory of Oilfield Chemistrythe Fundamental Research Funds for the Central Universities(19CX05006A)。
文摘During CO_(2)transportation and storage,metal equipment such as oilfield pipelines suffers from severe CO_(2)corrosion,especially in harsh downhole injection equipment.In this study,we investigated the corrosion behavior of oil well tubing in a high-temperature,high-pressure(HTHP)CO_(2)-containing environment.The evolution of the corrosion scale was also examined under different flow regimes.The results reveal a lower corrosion rate at 150℃compared to 80℃under different flow regimes,with localized corrosion intensifying as temperature and rotational speeds(vrs)increase.The temperature also induces the corrosion scale conversion of aragonite-type CaCO_(3)(80℃)to calcite-type CaCO_(3)(150℃).Specifically,the variation of the corrosion rate and the corrosion scale evolution can be attributed to the vortices within the reactor.The intact vortex cells enhance mass transfer while also promoting nucleation and growth of CaCO3.However,when vrsexceeds the critical Reynolds number,the vortex cells are disrupted,resulting in viscous dissipation and a reduced corrosion rate.
