石油化工腐蚀与防护
石油化工腐蝕與防護
석유화공부식여방호
PETROCHEMICAL CORROSION AND PROTECTION
2012年
1期
14-17
,共4页
董晓焕%姜毅%杨志伟%付彩利
董曉煥%薑毅%楊誌偉%付綵利
동효환%강의%양지위%부채리
CO2腐蚀缓蚀剂气井管柱
CO2腐蝕緩蝕劑氣井管柱
CO2부식완식제기정관주
CO2 corrosion%corrosion inhibitor%pipe of gas well
中国石油天然气股份有限公司长庆油田分公司上古气井具有中低二氧化碳、高矿化度及介质pH值变化大的腐蚀特点，同时气井井筒温度多处于腐蚀行为和机理多变的敏感区（60-100oC），这些特点对缓蚀剂的适应性提出了较高的要求。该文主要针对上述腐蚀环境的行为特征，通过缓蚀剂物化性能、相关配伍性、电化学性能、高温高压及现场井筒挂片质量损失分析，研究开发出适合中低CO2、高矿化度水气井腐蚀环境的水溶性缓蚀剂（HGCQ），具有水溶性良好，高温及低温稳定性优良，与甲醇及甲基二乙醇胺（MDEA）配伍性好的特点。室内研究了该缓蚀剂的缓蚀机理为阳极抑制型，确定其现场最佳加注质量浓度为300mg／L。进行了模拟占古气井筒腐蚀环境的高温高压腐蚀试验和现场一口气井3个月的质量损失挂片测试，结果表明该缓蚀剂缓蚀效果明显，可以有效控制气井管柱的腐蚀。
中國石油天然氣股份有限公司長慶油田分公司上古氣井具有中低二氧化碳、高礦化度及介質pH值變化大的腐蝕特點，同時氣井井筒溫度多處于腐蝕行為和機理多變的敏感區（60-100oC），這些特點對緩蝕劑的適應性提齣瞭較高的要求。該文主要針對上述腐蝕環境的行為特徵，通過緩蝕劑物化性能、相關配伍性、電化學性能、高溫高壓及現場井筒掛片質量損失分析，研究開髮齣適閤中低CO2、高礦化度水氣井腐蝕環境的水溶性緩蝕劑（HGCQ），具有水溶性良好，高溫及低溫穩定性優良，與甲醇及甲基二乙醇胺（MDEA）配伍性好的特點。室內研究瞭該緩蝕劑的緩蝕機理為暘極抑製型，確定其現場最佳加註質量濃度為300mg／L。進行瞭模擬佔古氣井筒腐蝕環境的高溫高壓腐蝕試驗和現場一口氣井3箇月的質量損失掛片測試，結果錶明該緩蝕劑緩蝕效果明顯，可以有效控製氣井管柱的腐蝕。
중국석유천연기고빈유한공사장경유전분공사상고기정구유중저이양화탄、고광화도급개질pH치변화대적부식특점，동시기정정통온도다처우부식행위화궤리다변적민감구（60-100oC），저사특점대완식제적괄응성제출료교고적요구。해문주요침대상술부식배경적행위특정，통과완식제물화성능、상관배오성、전화학성능、고온고압급현장정통괘편질량손실분석，연구개발출괄합중저CO2、고광화도수기정부식배경적수용성완식제（HGCQ），구유수용성량호，고온급저온은정성우량，여갑순급갑기이을순알（MDEA）배오성호적특점。실내연구료해완식제적완식궤리위양겁억제형，학정기현장최가가주질량농도위300mg／L。진행료모의점고기정통부식배경적고온고압부식시험화현장일구기정3개월적질량손실괘편측시，결과표명해완식제완식효과명현，가이유효공제기정관주적부식。
The Shanggu Gas Well of PetroChina Changqing Oil Field Company is characterized by low CO2, high minerality and greater variations of pH value of media, and gas wellg tube temperatures are mostly in the sensitive range （ 60 - 100℃） where the corrosion behavior and corrosion mechanisms change frequently. All these features impose a high requirement for the compatibility of corrosion inhibitor. Based upon the analysis of the characteristics of the above corrosion environment, the corrosion inhibitorg physical and chemical properties, associated compatibilities and electro - chemical performance as well as mass - loss of coupon testing in high temperature, high pressure and well tube, a water - soluble corrosion inhibitor （HGCQ） has been successfully developed for the corrosion environment of gas wells with low CO2 and high minerality. The corrosion inhibitor is good in water solubility, excellent in high - temperature and low - temperature stabilities and good in compatibility with methanol and MDEA. The laboratory tests have confirmed that the corrosion inhibition mechanism of the corrosion inhibitor is anode inhibition type and the optimal addition dosage is 300 mg/L. The high - temperature and high - pressure testing of simulated corrosion environment of Jingbian gas well and 3 months＂ mass - loss field coupon testing in a gas well show that the corrosion inhibitor is good in corrosion inhibition performance and effective in controlling the corrosion of pipe of gas well.
