本文選題：三相分離器 + 20#鋼　； 參考：《重慶科技學(xué)院》2015年碩士論文

【摘要】：隨著中原油田進(jìn)入特高含水開采期，導(dǎo)致三相分離器出現(xiàn)了不同程度的垢下腐蝕現(xiàn)象，分離器本體腐蝕穿孔頻發(fā)，大大降低了分離器的使用壽命，甚至引發(fā)重大安全生產(chǎn)事故。目前，中原油田三相分離器垢下腐蝕原因尚不明確，相關(guān)研究尚不系統(tǒng)全面。因此開展分離器垢下腐蝕行為及防護(hù)措施研究具有重要的學(xué)術(shù)價(jià)值和工程應(yīng)用意義，，為監(jiān)測(cè)并控制分離器垢下腐蝕提供參考理論依據(jù)。 本文通過現(xiàn)場(chǎng)調(diào)查分離器結(jié)垢部位和垢樣XRD、SEM分析、實(shí)驗(yàn)室垢下腐蝕影響因素和腐蝕特性試驗(yàn)、緩蝕阻垢劑優(yōu)選評(píng)價(jià)試驗(yàn)和犧牲陽極材料優(yōu)選評(píng)價(jià)試驗(yàn)，得到了中原油田三相分離器垢下腐蝕機(jī)理及防護(hù)措施實(shí)施方案。主要研究?jī)?nèi)容和結(jié)論如下： (1)通過現(xiàn)場(chǎng)調(diào)查油田正在使用的51臺(tái)分離器后發(fā)現(xiàn)：在分離器內(nèi)部構(gòu)件直管段、變徑處、轉(zhuǎn)彎處以及分離器筒體的中下部容易集結(jié)成垢，發(fā)生垢下腐蝕。XRD分析顯示垢樣主要成分為CaCO3、SiO2和少量CaSO4、BaSO4、SrSO4，垢下腐蝕產(chǎn)物主要成分為：Fe2O3、FeCO3、FeS等。 (2)確定CO2電化學(xué)腐蝕、Cl－導(dǎo)致的點(diǎn)蝕和SRB細(xì)菌腐蝕是造成分離器垢下腐蝕的主要原因。利用高溫高壓反應(yīng)釜模擬分離器工礦環(huán)境，研究了溫度、CO2分壓、Cl－含量、流速、SRB五個(gè)因素對(duì)垢下腐蝕速率的影響特性。正交試驗(yàn)結(jié)果顯示，五個(gè)因素對(duì)分離器本體垢下腐蝕速率影響程度的大小依次為：SRB含量＞CO2分壓＞Cl－濃度＞工作介質(zhì)溫度＞工作介質(zhì)流速。 (3)通過常壓靜態(tài)初選試驗(yàn)、高溫高壓動(dòng)態(tài)評(píng)價(jià)試驗(yàn)、模擬分離器工況環(huán)境動(dòng)態(tài)評(píng)價(jià)試驗(yàn)，從12種緩蝕阻垢劑中優(yōu)選出了ZY-7、ZY-10兩種緩蝕阻垢劑，投加濃度為200mg/L時(shí)緩蝕阻垢率均超過80%，可以應(yīng)用于中原油田分離器垢下腐蝕防護(hù)現(xiàn)場(chǎng)；通過犧牲陽極材料優(yōu)選評(píng)價(jià)試驗(yàn)，優(yōu)選出Al-Zn-In三元鋁合金作為分離器犧牲陽極保護(hù)材料，現(xiàn)場(chǎng)應(yīng)用試驗(yàn)表明，其平均保護(hù)度達(dá)到94.76%，現(xiàn)場(chǎng)試驗(yàn)結(jié)果達(dá)到防腐要求。在此基礎(chǔ)上，提出了中原油田分離器垢下腐蝕防護(hù)措施實(shí)施方案。
[Abstract]:With Zhongyuan oilfield entering into the period of super high water cut, the three-phase separator appears different degree of scale corrosion phenomenon, the separator body corrosion perforation frequently occurs, greatly reduces the separator service life, even causes the important safety production accident. At present, the reason of corrosion under scale of three-phase separator in Zhongyuan Oilfield is not clear, and the related research is not systematic. Therefore, it is of great academic value and engineering application significance to study the corrosion behavior and protective measures under scale of separator, and to provide a theoretical basis for monitoring and controlling the corrosion under scale of separator. In this paper, the factors affecting corrosion under scale in laboratory and corrosion characteristic test, the optimum selection and evaluation test of corrosion inhibitor and sacrificial anode material are studied by field investigation of scale forming site of separator and scale sample by XRDX SEM. The corrosion mechanism under scale of three-phase separator in Zhongyuan Oilfield and its protective measures are obtained. The main contents and conclusions are as follows: 1) through the field investigation of 51 separators in use in the oil field, it is found that scale is easily accumulated in the straight pipe section of the internal component of the separator, at the variable diameter, at the corner, and in the middle and lower parts of the separator cylinder. The results of scale corrosion. XRD analysis showed that the main components of scale samples were CaCO3SiO2 and a small amount of CaSO4, BaSO4, SrSO4, and the main components of corrosion products under scale were:% Fe2O3FeCO3Fe3FeS and so on. (2) the pitting corrosion caused by CO2 electrochemical corrosion and the corrosion of SRB bacteria are the main causes of the corrosion under the scale of the separator. By using high temperature and high pressure reactor to simulate the industrial and mineral environment of separator, the effects of temperature and CO _ 2 partial pressure (CO _ 2) content and SRB on the corrosion rate under scale were studied. The results of orthogonal test show that the influence of five factors on the corrosion rate of the separator is in the order of: SRB content > CO2 partial pressure > Cl-concentration > working medium temperature > working medium flow rate. Through static primary test of atmospheric pressure, dynamic evaluation test of high temperature and high pressure, dynamic evaluation test of simulated separator working condition, two kinds of corrosion and scale inhibitor ZY-7 and ZY-10 were selected from 12 kinds of corrosion and scale inhibitor. When the concentration of 200mg/L is added, the corrosion and scale inhibition rate is more than 80%, which can be used in the field of corrosion protection under scale of separator in Zhongyuan Oilfield, and the Al-Zn-In ternary aluminum alloy is selected as the sacrificial anode protection material through the optimal selection and evaluation test of sacrificial anode material. The field application test shows that the average protection degree is 94.76 and the field test results meet the requirements of anticorrosion. On this basis, the implementation scheme of corrosion prevention measures under scale of separator in Zhongyuan Oilfield is put forward.
【學(xué)位授予單位】：重慶科技學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE983

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