石油机械
石油機械
석유궤계
CHINA PETROLEUM MACHINERY
2015年
8期
87-92
,共6页
CO2腐蚀%腐蚀预测%半经验模型%分段预测模型%海上油套管%CNOOC模型
CO2腐蝕%腐蝕預測%半經驗模型%分段預測模型%海上油套管%CNOOC模型
CO2부식%부식예측%반경험모형%분단예측모형%해상유투관%CNOOC모형
CO2 corrosion%corrosion prediction%semi-empirical model%segmented prediction model%off-shore oil casing%CNOOC model
油套管CO2腐蚀是目前我国海上油气田开发中的难点，常用的腐蚀预测模型多存在适用范围的局限性。机理研究表明，碳钢和低合金钢的腐蚀机理存在温度转变点，腐蚀机理的转变是导致预测模型适用范围受限、超出范围后精度较低的主要原因。针对这一问题，基于目前海上油套管设计使用的半经验腐蚀预测模型，建立了分段腐蚀预测模型。在大量腐蚀试验数据的基础上，建立了碳钢、1Cr、3Cr、9Cr和13Cr钢的腐蚀速率预测模型。误差分析结果表明，分段腐蚀预测模型能有效提高腐蚀速率预测的精度，可为海上油气田CO2腐蚀条件下的油套管选材与防腐策略制定提供技术支持。实例分析展示了分段预测模型的实用性和有效性。
油套管CO2腐蝕是目前我國海上油氣田開髮中的難點，常用的腐蝕預測模型多存在適用範圍的跼限性。機理研究錶明，碳鋼和低閤金鋼的腐蝕機理存在溫度轉變點，腐蝕機理的轉變是導緻預測模型適用範圍受限、超齣範圍後精度較低的主要原因。針對這一問題，基于目前海上油套管設計使用的半經驗腐蝕預測模型，建立瞭分段腐蝕預測模型。在大量腐蝕試驗數據的基礎上，建立瞭碳鋼、1Cr、3Cr、9Cr和13Cr鋼的腐蝕速率預測模型。誤差分析結果錶明，分段腐蝕預測模型能有效提高腐蝕速率預測的精度，可為海上油氣田CO2腐蝕條件下的油套管選材與防腐策略製定提供技術支持。實例分析展示瞭分段預測模型的實用性和有效性。
유투관CO2부식시목전아국해상유기전개발중적난점，상용적부식예측모형다존재괄용범위적국한성。궤리연구표명，탄강화저합금강적부식궤리존재온도전변점，부식궤리적전변시도치예측모형괄용범위수한、초출범위후정도교저적주요원인。침대저일문제，기우목전해상유투관설계사용적반경험부식예측모형，건립료분단부식예측모형。재대량부식시험수거적기출상，건립료탄강、1Cr、3Cr、9Cr화13Cr강적부식속솔예측모형。오차분석결과표명，분단부식예측모형능유효제고부식속솔예측적정도，가위해상유기전CO2부식조건하적유투관선재여방부책략제정제공기술지지。실례분석전시료분단예측모형적실용성화유효성。
CO2 corrosion of tubing and casing is a difficult problem in China’ s offshore oil and gas field de?velopment?Commonly used corrosion prediction models are mostly subject to limitation of application scope?Mechanism study results show that, corrosion mechanism of carbon steel and low?alloy steel has a tempera?ture change point; change of the corrosion mechanism is primary cause for the prediction model being subject to limitation of application scope and low accuracy beyond the application scope?To solve this problem, a segmented corrosion prediction model is put forward based on existing semi?empirical corrosion prediction model designed and used for offshore tubing and casing?A corrosion rate prediction model is built for carbon steel, 1Cr, 3Cr, 9Cr and 13Cr based on a number of corrosion test data?Error analysis results shows that, the segmented corrosion prediction model can effectively improve accuracy of corrosion rate prediction in order to provide technical supports for selec?tion of tubing and casing and establishment of corrosion protection strategy under CO2 corrosion of offshore oil and gas fields?The case analysis shows practicability and effectiveness of the segmented prediction model.
