木南区机采井防腐防垢技术研究与应用

发布时间：2018-07-11 11:47

本文选题：木南区 + 缓蚀防垢　；参考：《东北石油大学》2015年硕士论文

【摘要】：本论文主要研究木南区油田井筒腐蚀、结垢现象。通过腐蚀、结垢机理和影响因素分析,明确腐蚀、结垢发生的原因,在此基础上开展防腐防垢技术研究,提出预防治理方案,以解决困绕油田生产多年的腐蚀、结垢难题。对木南区油田开展油、水、垢样测试分析。水质分析结果表明:木南区油田不同断块油井矿化度相差较大,在320mg/L~11000mg/L之间。木南区油田不同断块油井细菌含量较高,最高的让41断块的让41井高达106以上,同时含有S2-。木南区油田大部分油井含有游离CO2。实验选取木南区10口井垢样分析结果表明:有六口井以腐蚀为主,其中五口井存在轻度无机结垢;五口井存在硫化物腐蚀。4口井腐蚀、结垢并存。无法判断是否存在二氧化碳腐蚀,也不能肯定存在氧腐蚀。注入水与地层配伍性研究结果分析表明,不同断块、不同油井与对应注入水之间配伍性存在差异,有的配伍性较好,有的较差,有的影响不大。开展腐蚀影响因素及其规律实验,研究结果表明:Cl-含量在6000mg/L的范围内,腐蚀速率随Cl-含量增加先增加后减小,1000mg/L时腐蚀速率最大。随着SO42-浓度的增加,腐蚀速率先增加后减小,在400mg/L时腐蚀速率最大。随着HCO3-浓度的增加腐蚀速率先减小后增大,在HCO3-浓度达到600mg/L时腐蚀速率下降的比较缓慢,曲线接近水平;当HCO3-浓度达到800mg/L时腐蚀速率开始上升。对腐蚀结垢机理进行分析,油井结垢主要来源两个方面:油井生产层位不同可能导致结垢和物理条件发生变化导致结垢。进行室内实验药剂初选,结果表明:缓蚀剂和阻垢剂五种组合方式中5号配方效果最佳,室内实验缓蚀率达到82%,阻垢率达到92%。利用室内实验筛选所得最佳药剂组合开展单井配方验证实验,结果表明:优选出的5号配方对不同油井虽然缓蚀、阻垢效果有所差别,但最体来看,均具有较好的缓蚀、阻垢效果,在加药量达到120mg/L时,缓蚀率达到70%以上,阻垢率达到80%以上,基本能满足现场试验的需要。利用室内实验筛选所得最佳药剂组合进行现场实验,结果表明:试验选取的缓蚀剂和阻垢剂起到较好的缓蚀、阻垢效果,缓蚀率接近90%,阻垢率达到90%左右。
[Abstract]:This paper mainly studies well hole corrosion and scaling phenomenon in Munan Oilfield. Through the analysis of corrosion, scaling mechanism and influencing factors, the causes of corrosion and scaling are determined. On the basis of this, the anticorrosion and scale prevention technology is studied, and the prevention and treatment scheme is put forward to solve the problem of corrosion and scaling in oil field for many years. Test and analysis of oil, water and scale in Mu Nan Oilfield. The results of water quality analysis show that the mineralization degree of the wells in different fault blocks in Munan Oilfield is quite different, ranging from 320 mg / L to 11 000 mg / L. The content of bacteria in the wells of different fault blocks in Munan Oilfield is high, and the highest oil wells of Jeng41 block are over 106, and the oil wells contain S2-2. Most of the wells in Munan Oilfield contain free CO _ 2. The results of scale analysis of 10 wells in Mu Nan District show that six wells are mainly corroded, among which five wells have mild inorganic scaling, and five wells have sulfide corrosion of .4 wells. It is impossible to determine whether there is carbon dioxide corrosion or oxygen corrosion. The results of study on compatibility between injection water and formation show that there are differences in compatibility between different fault blocks and corresponding injection water, some of which are good compatibility, some are poor, and some have little effect. The experimental results show that the corrosion rate increases first with the increase of Cl- content and then decreases by 1000 mg / L. The results show that the corrosion rate is the highest in the range of 6 000 mg / L of Cl- content and then decreases to 1 000 mg / L with the increase of Cl- content. With the increase of so _ 4 ~ (2-) concentration, the corrosion rate increases first and then decreases, and the corrosion rate is the highest at 400 mg 路L ~ (-1) 路L ~ (-1). With the increase of HCO _ 3- concentration, the corrosion rate decreases first and then increases. The corrosion rate decreases slowly when the HCO _ 3- concentration reaches 600mg / L, and the curve is close to the level, and the corrosion rate begins to rise when the HCO _ 3- concentration reaches 800mg / L. According to the analysis of corrosion and scaling mechanism, there are two main sources of scale in oil wells: the different layers of oil well production may lead to scaling and the change of physical conditions may lead to scaling. The results showed that formula No. 5 had the best effect among the five combinations of corrosion inhibitor and scale inhibitor. The corrosion inhibition rate and scale inhibition rate were 82 and 92 respectively. Single well formula verification experiment was carried out with the best combination of chemicals selected by laboratory experiments. The results show that the selected formula 5 has different corrosion inhibition and scale inhibition effect to different wells, but in most cases, it has better corrosion inhibition. When the dosage is 120 mg / L, the corrosion inhibition rate is more than 70% and the scale inhibition rate is over 80%, which can basically meet the needs of field test. The results show that the corrosion inhibitor and scale inhibitor selected in the experiment have a good corrosion inhibition effect, the inhibition rate is close to 90, and the scale inhibition rate is about 90%.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE983

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