【正文】 imidazoline and amine salt anticorrosion, of which concentration is from 100 ppm to 400ppm, have only to 32 percent anticorrosion capacity when medium current speed is , and can not meet corrosion control requirement. However the anticorrosion capacity of posite anticorrosion agent, which we developed is ～ times more than that of imidazoline anticorrosion agent. Individual well dosing scheme, Impact dosing circle from endpoint of gathering lines and dosing amount have been optimized, After three circles of field test, the general iron level declined percent, the bacteria content declined 1～ 2 quantity degree, corrosion rate declined 8～ 50 percent and can be controlled under , moreover there is no point corrosion. The research of this thesis has acquired noticeable economic and social benefit. Keywords: Gathering lines Corrosion Preservation Anticorrosive Agent Thesis type: Application Foundation VII 目 錄 第一章 緒 論 ................................................................................................................... 1 研究的背景及意義 ................................................................................................ 1 國內(nèi)外發(fā)展動(dòng)向 .................................................................................................... 1 中原油田集輸管線腐蝕狀況調(diào)查 ........................................................................ 5 調(diào)查方案 ..................................................................................................... 5 調(diào)查數(shù)據(jù)及統(tǒng)計(jì)數(shù)據(jù) ................................................................................. 6 調(diào)查結(jié)果分析 ........................................................................................... 10 調(diào)查總結(jié) ................................................................................................... 17 本文研究的主要內(nèi)容 .......................................................................................... 17 技術(shù)路線 .............................................................................................................. 18 第二章 模擬集輸管線生產(chǎn)條件下的介質(zhì)因素對(duì)腐蝕的影響 ..................................... 19 集輸管線介質(zhì)腐蝕特性分析 ............................................................................... 19 集輸管線介質(zhì)流速流態(tài)分析 ................................................................... 19 集輸管線介質(zhì)變化情況分析 ................................................................... 22 介質(zhì)因素對(duì)腐蝕的影響 .................................................................................... 24 集輸管線生產(chǎn)條件下介質(zhì)溫度對(duì)腐蝕的影響 ....................................... 25 集輸管線生產(chǎn)條件下介質(zhì)礦化度對(duì)腐蝕的影響 ................................... 26 集輸管線生產(chǎn)條件下介質(zhì)流速對(duì)腐蝕的影響 ....................................... 28 集輸管線生產(chǎn)條件下介質(zhì)油水比對(duì)腐蝕的影響 ................................... 29 集輸管線生產(chǎn)條件下介質(zhì)二氧化碳分壓對(duì)腐蝕的影響 ....................... 30 氧含量對(duì)腐蝕的影響 ............................................................................... 31 pH 對(duì)腐蝕的影響 ................................................................................... 32 不同 pH 條件下掛片法與線性極化法的對(duì)應(yīng)關(guān)系 ................................ 34 不同 pH 條件下快速測試法與掛片法的對(duì)應(yīng)關(guān)系 ................................ 35 介質(zhì)因素對(duì)集輸管線的腐蝕影響分析 ............................................................ 36 溫度對(duì)腐蝕的影響 ................................................................................... 36 介質(zhì)礦化度對(duì)腐蝕的影響 ....................................................................... 37 流速對(duì)腐蝕的影響 ................................................................................... 37 介質(zhì)油水比對(duì)腐蝕的影響 ....................................................................... 38 二氧化碳分壓對(duì)腐蝕的影響 ................................................................... 38 氧含量對(duì)腐蝕的影響 ............................................................................... 39 pH 值對(duì)腐蝕的影響 .................................................................................. 40 細(xì)菌對(duì)腐蝕的影響 ................................................................................... 41 VIII 本章小結(jié) .............................................................................................................42 第三章 模擬集輸管線生產(chǎn)條件下的管材評(píng)價(jià) ..............................................................43 中原油田集輸管線材質(zhì)及腐蝕產(chǎn)物成份分析 ...................................................43 集輸管線材質(zhì)及腐蝕產(chǎn)物分析 ................................................................43 管材的組分和材質(zhì)的夾雜物分析 ............................................................48 集輸管線介質(zhì)條件下不同材質(zhì)耐腐蝕評(píng)價(jià) .......................................................50 實(shí)驗(yàn)條件 ....................................................................................................50 實(shí)驗(yàn)結(jié)果 ....................................................................................................50 分析評(píng)價(jià) ....................................................................................................51 集輸管線介質(zhì)條件下不同鋼材耐局部腐蝕試驗(yàn) ...............................................51 實(shí)驗(yàn)條件 ....................................................................................................51 實(shí)驗(yàn)結(jié)果 ....................................................................................................51 分析評(píng)價(jià) ....................................................................................................54 實(shí)驗(yàn)結(jié)論 ....................................................................................................56 現(xiàn)場用不同集輸管材耐土壤腐蝕性評(píng)價(jià) ...........................................................56 三種鋼材的夾雜物分析 .......................................................................................57 本章小結(jié) ...............................................................................................................61 第四章 緩蝕劑評(píng)價(jià)、改進(jìn)和現(xiàn)場應(yīng)用 ..........................................................................62 集輸管線 腐蝕的防護(hù) ............................................................................................62 模擬現(xiàn)場