發(fā)布時間：2018-04-03 22:26

  本文選題：P110SS鋼　切入點：H_2S/CO_2腐蝕　出處：《西南石油大學》2017年碩士論文

【摘要】：P110SS鋼為抗硫套管鋼,主要應(yīng)用于高酸性含硫油氣田。在H2S/CO2環(huán)境中,鋼材與環(huán)境介質(zhì)發(fā)生的電化學腐蝕和氫滲透引起的氫脆嚴重威脅套管鋼的正常服役。然而,在腐蝕環(huán)境中鋼材表面會形成腐蝕產(chǎn)物膜,其性能對腐蝕速率、腐蝕類型和氫滲透行為有決定性的作用。因此,本文對P110SS鋼在H2S/CO2環(huán)境中腐蝕產(chǎn)物的結(jié)構(gòu)和保護性能進行了研究。采用高溫高壓釜制備了不同的腐蝕產(chǎn)物,其中H2S/CO2的分壓比為1:0、1:3、1:7、0:1,腐蝕時間為5h、18h、72h。測試表明,在分壓比為1:0、1:3、1:7的腐蝕環(huán)境中形成的均是FeS_(1-x)腐蝕產(chǎn)物,其中包含馬基諾礦和立方相FeS;在分壓比為0:1的環(huán)境中形成的是FeCO_3腐蝕產(chǎn)物。對于各FeS_(1-x)腐蝕產(chǎn)物,經(jīng)過5 h的腐蝕后,其結(jié)構(gòu)最致密,保護性最好;當腐蝕時間達到18 h,FeS_(1-x)腐蝕產(chǎn)物膜會經(jīng)歷脫落和晶粒二次生長的過程,因此其保護性最低;當腐蝕時間達到72 h后,腐蝕產(chǎn)物膜得到一定的修復,保護性提高,但仍然低于經(jīng)過5h形成的腐蝕產(chǎn)物膜。但是在抑制氫滲透的能力上,腐蝕72 h形成的FeS_(1-x)腐蝕產(chǎn)物膜高于腐蝕5h形成的FeS_(1-x)腐蝕產(chǎn)物。當腐蝕時間為5h和72h時,隨著CO2分壓的增加,FeS_(1-x)腐蝕產(chǎn)物中馬基諾礦的含量逐漸增大,立方相FeS的含量逐漸減小,腐蝕產(chǎn)物膜的保護性和抑制氫滲透的能力均逐漸增強。FeCO_3腐蝕產(chǎn)物膜的保護性和抑制氫滲透的能力均隨腐蝕時間的增加而急劇增大,并且當腐蝕時間均為18 h和72 h時,以上性能均遠高于FeS1x腐蝕產(chǎn)物膜。將以上各分壓比中腐蝕72h形成的腐蝕產(chǎn)物膜分別在CaCl_2、MgCl_2、Na_2SO_4和NaHCO_3溶液中浸泡后,對其形貌和保護性能進行了分析。實驗結(jié)果表明,經(jīng)過CaCl_2和MgCl_2溶液浸泡后,FeS_(1-x)腐蝕產(chǎn)物的溶解程度較大,對基體局部腐蝕的抑制作用較弱,其保護性均隨著CO2分壓的增加而下降。經(jīng)過Na_2SO_4和NaHCO_3溶液浸泡后,FeS_(1-x)腐蝕產(chǎn)物的溶解較小,對基體局部腐蝕的抑制作用較強,其保護性均隨著CO2分壓的增加而增強;但是以上溶液對FeC03腐蝕產(chǎn)物膜的侵蝕作用均非常輕微,并且FeC03腐蝕產(chǎn)物膜的保護性顯著強于各種FeS_(1-x)腐蝕產(chǎn)物膜。對于各腐蝕產(chǎn)物膜,在不同溶液中保護性從高到低的順序均為:NaHCO_3、Na_2SO_4、CaCl_2、MgCl_2。
[Abstract]:P110SS steel is a sulfur-resistant casing steel, which is mainly used in high acid sour oil and gas fields.In H2S/CO2 environment, electrochemical corrosion and hydrogen embrittlement caused by hydrogen permeation and electrochemical corrosion of steel and environmental media seriously threaten the normal service of casing steel.However, the corrosion product film is formed on the steel surface in corrosion environment, and its performance plays a decisive role in corrosion rate, corrosion type and hydrogen permeation behavior.Therefore, the structure and protective properties of corrosion products of P110SS steel in H2S/CO2 environment were studied in this paper.Different corrosion products were prepared in a high temperature and high pressure kettle. The partial pressure ratio of H2S/CO2 was 1: 0: 1: 1: 1: 1: 7: 01, and the corrosion time was 5 h / 18h / 72h.The results show that all the corrosion products formed in the corrosion environment with a partial pressure ratio of 1: 0 / 1: 1: 3: 1: 7 are FeSZ 1-x) corrosion products, which contain the Markino ore and cubic phase FeS, and the FeCO_3 corrosion products are formed in the environment with a partial pressure ratio of 0:1.After 5 h corrosion, the structure of the corrosion product is the densest and the most protective, and when the corrosion time reaches 18 h, the corrosion product film will undergo the process of shedding and grain secondary growth, so its protection is the lowest.When the corrosion time reaches 72 h, the corrosion product film is repaired and the protection is improved, but it is still lower than the corrosion product film formed after 5 hours.However, in the ability of inhibiting hydrogen permeation, the corrosion product film formed by corrosion for 72 hours is higher than that formed after corrosion for 5 hours.When the corrosion time is 5h and 72h, with the increase of CO2 partial pressure, the content of Macino ore in the corrosion product increases gradually, and the content of cubic phase FeS decreases gradually.The protection of corrosion product film and the ability of inhibiting hydrogen permeation increased rapidly with the increase of corrosion time, and when the corrosion time was 18 h and 72 h, the protective and inhibiting hydrogen permeation ability of corrosion product film increased rapidly with the increase of corrosion time.The above properties are much higher than FeS1x corrosion product films.The corrosion product films formed during 72 hours of corrosion in the above partial pressure ratios were soaked in CaCl _ 2MgCl _ 2C _ 2N _ 2SO _ 4 and NaHCO_3 solution respectively. The morphology and protective properties of the films were analyzed.The experimental results show that the dissolution degree of the corrosion products of CaCl_2 and MgCl_2 solution is larger, the inhibition of local corrosion of the matrix is weaker, and the protection of the corrosion products decreases with the increase of the partial pressure of CO2.After soaking in Na_2SO_4 and NaHCO_3 solutions, the dissolution of the corrosion products was relatively small, the inhibition of local corrosion on the substrate was stronger, and the protection of the corrosion products increased with the increase of partial pressure of CO2, but the corrosion effect of the above solutions on the corrosion product films of FeC03 was very slight.Moreover, the FeC03 corrosion product film is much more protective than various FeS-1-x corrosion product films.For each corrosion product film, the order of protection from high to low in different solutions is: NaHCO _ 3 / S _ 2SO _ 4 / CaCl _ 2MgCl _ 2.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG178

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