| LIU Zhengyu,CONG Haoyu,MOU Chenglong,CAO Xueqian,ZHANG Guang'an,XUE Qunji.Corrosion Resistance and Wear Resistance of Element Doped DLC Films in Simulated Oil and Gas Field Solution[J],53(11):35-44 |
| Corrosion Resistance and Wear Resistance of Element Doped DLC Films in Simulated Oil and Gas Field Solution |
| Received:April 01, 2024 Revised:May 31, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.11.003 |
| KeyWord:oil and gas fields pipeline protection DLC corrosion resistance wear resistance sand abrasion |
| Author | Institution |
| LIU Zhengyu |
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China;University of Chinese Academy of Sciences, Beijing , China |
| CONG Haoyu |
School of Mechanical, Electrical & Information Engineering, Shandong University, Shandong Weihai , China |
| MOU Chenglong |
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China;University of Chinese Academy of Sciences, Beijing , China |
| CAO Xueqian |
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| ZHANG Guang'an |
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China;University of Chinese Academy of Sciences, Beijing , China |
| XUE Qunji |
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
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| Abstract: |
| Oil and gas resources are the main energy and chemical raw materials in the world today. Under the premise of limited total reserves of oil and gas resources, in order to improve the efficiency of oil and gas exploitation, CO2 flooding technology is widely used. However, CO2 flooding technology aggravates the acidification of oilfield produced water, so that oil and gas production pipelines are in a solution containing CO2/H2S/Cl‒ for a long time. The oilfield produced water solution has strong permeability and corrosivity. At the same time, the oil and gas exploitation is also faced with the abrasion of sand, which aggravates the corrosion. Therefore, there is an urgent need for a material to protect the inner surface of oil and gas exploitation pipelines. At present, the methods of protecting oil and gas exploitation pipelines have the defects of environmental pollution and high cost. At the same time, it is difficult to protect pipelines in the harsh environment of oil and gas exploitation. Diamond-like carbon (DLC) film with high hardness, high wear resistance and high corrosion resistance is an excellent protective material for oil and gas pipelines. In this work, H-DLC, F-HDLC, N-HDLC and Si-HDLC were deposited on the surface of SS304 square sample by plasma enhanced chemical vapor deposition (PECVD) technology, and their corrosion resistance in CO2/H2S/Cl‒ solution of simulated oil and gas fields was characterized by electrochemical test. The CSM reciprocating friction machine was used to test the corrosion resistance in simulated solution containing sediment. The wear scar and its morphology after friction test were analyzed by Raman spectroscopy and scanning electron microscopy (SEM). The deposition of DLC film significantly improved the corrosion resistance of SS304 substrate. The doping of Si element reduced the internal stress of DLC film, and increased the content of sp3-C hybridization, and greatly improved the corrosion resistance of H-DLC film. The Si-doped DLC film possessed the highest pore resistance and the lowest corrosion current density, and had the best corrosion resistance in simulated oil and gas field solution. The wear resistance of SS304 substrate was greatly improved after deposition of DLC film. The formation of transfer film reduced the friction coefficient and wear rate. The transfer film could still be formed stably when rubbing with the SiO2 counterpart ball of simulated sand. The wear of SS304 substrate and DLC film in oil and gas produced water containing a large amount of sediment was simulated by adding SiO2 powder to the corrosion solution. After the friction test, severe abrasive wear occurred on the surface of SS304 substrate. The surface of DLC film doped with different elements had different degrees of spalling, but it greatly alleviated the wear of the substrate compared with the substrate. The deposition of DLC film can greatly improve the corrosion resistance and wear resistance of SS304 substrate. Si-HDLC film possesses the best corrosion resistance and stability in simulated oil and gas field solution, which makes it have excellent wear resistance in corrosion solution. |
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