【摘要】：番禺30-1氣田產(chǎn)出天然氣組分中包含H2S和CO2腐蝕性氣體,各氣井采出水不僅呈酸性,還含有HCO3-和Cl-等腐蝕性離子。在溫度和壓力的作用下,這些腐蝕性介質(zhì)很容易腐蝕番禺30-1平臺(tái)生產(chǎn)管道,一旦平臺(tái)上有某段管道因腐蝕發(fā)生失效事故將會(huì)帶來不可估量的后果,因此研究番禺30-1平臺(tái)生產(chǎn)管線的腐蝕機(jī)理并提前預(yù)測(cè)出剩余服役壽命尤為必要。本文以番禺30-1平臺(tái)4-PW-1002-E5-P、8-PV-2060-E2、12-PV-1010-E5和6-WS-4064-A5四段現(xiàn)場(chǎng)管線及其材質(zhì)(16Mn鋼、20#鋼、雙相不銹鋼F51)為研究對(duì)象,通過能譜分析、X衍射、焊接接頭焊接工藝評(píng)定、抗硫化氫腐蝕性能評(píng)估、腐蝕電化學(xué)實(shí)驗(yàn)等手段研究現(xiàn)場(chǎng)管道的腐蝕機(jī)理,然后利用失重法計(jì)算以上三種材質(zhì)在模擬現(xiàn)場(chǎng)環(huán)境下的平均腐蝕速率,最后依據(jù)API579標(biāo)準(zhǔn)和SY/T6151-2009標(biāo)準(zhǔn)評(píng)價(jià)四段管線目前的服役適應(yīng)性,在確定管道當(dāng)前的剩余強(qiáng)度滿足運(yùn)行要求后,分別采用均勻腐蝕剩余壽命預(yù)測(cè)模型和檢測(cè)數(shù)據(jù)剩余壽命預(yù)測(cè)模型預(yù)測(cè)它們的剩余服役壽命,主要取得以下結(jié)論： (1)4-PW-1002-E5-P段管道的腐蝕機(jī)理是Cl-促進(jìn)的SRB腐蝕、HC03-腐蝕和應(yīng)力腐蝕,8-PV-2060-E2和12-PV-1010-E5兩段管道的腐蝕機(jī)理是Cl-促進(jìn)的H2S腐蝕、CO2腐蝕、HCO3-腐蝕和應(yīng)力腐蝕,6-WS-4064-A5段管道的腐蝕機(jī)理是Cl-促進(jìn)的溶解氧腐蝕和應(yīng)力腐蝕。 (2)現(xiàn)場(chǎng)管道的焊接接頭都存在外部或內(nèi)部缺陷,并且它們的拉伸性能全部不合格。個(gè)別焊接接頭的沖擊韌性和顯微硬度也存在問題。 (3)4-PW-1002-E5-P、8-PV-2060-E2、12-PV-1010-E5和6-WS-4061-A5四段管道目前的剩余強(qiáng)度滿足繼續(xù)服役的要求,其中8-PV-2060-E2段管道的剩余壽命為16年,其余三段管道的剩余壽命都滿足20年的設(shè)計(jì)使用年限。 綜上所述,Cr、H2S、CO2、HCO3-、SRB是番禺30-1平臺(tái)生產(chǎn)管線的主要腐蝕因素,此外雖然4-PW-1002-E5-P、8-PV-2060-E2、12-PV-1010-E5和6-WS-4064-A5四段現(xiàn)場(chǎng)管線已經(jīng)遭受了不同程度的腐蝕,但是目前依然有能力繼續(xù)工作運(yùn)行。
[Abstract]:The components of natural gas produced in Panyu 30-1 gas field contain corrosive gases such as H _ 2S and CO2. The produced water of each gas well is not only acidic, but also contains corrosive ions such as HCO3- and Cl-. Under the action of temperature and pressure, these corrosive media can easily corrode the production pipeline of Panyu 30-1 platform. Once a certain section of pipeline on the platform is damaged by corrosion, there will be incalculable consequences. Therefore, it is necessary to study the corrosion mechanism of Panyu 30-1 production pipeline and predict the remaining service life in advance. In this paper, 4-PW-1002-E5-Pen 8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4064-A5 four-stage pipeline and its material (16Mn steel, 20# steel, two-phase stainless steel F51) are studied in Panyu 30-1 platform. By means of energy spectrum analysis, X-ray diffraction, welding process evaluation of welded joints, evaluation of corrosion resistance of hydrogen sulfide and electrochemical corrosion experiments, the corrosion mechanism of pipeline in situ was studied. Then the average corrosion rate of the above three materials is calculated by weightlessness method. Finally, the adaptability of the four-section pipeline is evaluated according to API579 standard and SY/T6151-2009 standard. After determining that the current residual strength of the pipeline meets the operational requirements, the remaining service life of the pipeline is predicted by the uniform corrosion residual life prediction model and the test data residual life prediction model, respectively. The main conclusions are as follows: (1) the corrosion mechanism of 4-PW-1002-E5-P pipeline is SRB corrosion, HC03- corrosion and stress corrosion promoted by Cl-. The corrosion mechanism of 8-PV-2060-E2 and 12-PV-1010-E5 pipeline is H _ 2S corrosion, CO2 corrosion, HCO3- corrosion and stress corrosion promoted by Cl-. The corrosion mechanism of 6-WS-4064-A5 pipeline is dissolved oxygen corrosion and stress corrosion promoted by Cl-. (2) there are external or internal defects in the welded joints of the field pipes, and their tensile properties are all not up to standard. The impact toughness and microhardness of individual welded joints are also problematic. (3) the current residual strength of 4-PW-1002-E5-Pn-8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4061-A5 four-stage pipeline meets the requirement of continuing service, in which the residual life of 8-PV-2060-E2 section pipeline is 16 years, The remaining life of the remaining three sections of the pipeline meets the design life of 20 years. To sum up, Cr,H2S,CO2,HCO3-,SRB is the main corrosion factor in the production pipeline of Panyu 30-1 platform, in addition, although 4-PW-1002-E5-P, The 8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4064-A5 four-stage pipelines have been corroded to varying degrees, but they are still capable of continuing operation.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE988.2

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