吴定区块多层系开发采出液集输系统的堵塞机理
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摘要
针对吴定区块多层系开发油井集输管线中堵塞严重的问题,对不同层系的采出水化学组成进行分析,按照均匀设计原理对各层系采出水不同配比进行结垢类型与趋势预测,结合不同位置堵塞物的化学容量分析、X-荧光光谱半定量分析和采出水腐蚀性评价结果对集输管线中的堵塞物形成机理进行了分析研究。结果表明:吴7增侏罗系采出水高含碳酸盐,结垢类型以CaCO_3垢为主,含有一定量的硫酸锶钡垢,延4+5与延10两个层系的采出水水质不配伍,应将其分开输送;吴8增三叠系硫酸盐含量较高,结垢类型主要为硫酸锶钡垢型,长2、长4+5和长6三层系集输的最佳比例为2∶47.5∶14;吴7增侏罗系和吴8增三叠系堵塞物分析结果与结垢趋势预测基本一致,同时堵塞物中Fe离子含量较高主要是由腐蚀严重引起的。吴定区块多层系开发油井集输管线堵塞主要是由结垢和腐蚀的相互作用引起的无机物堵塞。
In order to solve the problem of serious blockage in the gathering and transportation pipeline of multi-layered development oil wells in Wuding block,the chemical composition of produced water from different layers was analyzed,and the scaling types and scaling trends of the produced water mixed by the produced water from different layers in different proportions were predicted according to the principle of uniform design.The formation mechanism of blockage in gathering and transportation pipeline is analyzed and studied according to the chemical capacity analysis and X-ray fluorescence semi-quantitative analysis results of the blockages from different positions and the corrosivity evaluation of produced water.The results show that,Jurassic produced water at Wu 7 pressure increasing station has high carbonate content,it mainly forms CaCO_3 scale,and a certain amount of strontium barium sulfate scale would be also formed.The produced water from Yan 4+5 layer is incompatible with the produced water from Yan 10 layer,so they should be transported separately.Triassic produced water at Wu 8 pressure increasing station has high sulfate content,it mainly forms strontium barium sulfate scale,and the optimum volume ratio of produced water from Chang 2,Chang 4+5 and Chang 6 layers is 2∶47.5∶14.The analysis results of blockage at Wu 7 and Wu 8 pressure increasing stations are basically consistent with the prediction results of scaling trend,and the high content of Fe ions in blockage is mainly caused by serious corrosion.The blockage in the gathering and transportation pipelines of multi-layer development wells in Wuding block is mainly inorganic matter blockage caused by the interaction of scaling and corrosion.
In order to solve the problem of serious blockage in the gathering and transportation pipeline of multi-layered development oil wells in Wuding block,the chemical composition of produced water from different layers was analyzed,and the scaling types and scaling trends of the produced water mixed by the produced water from different layers in different proportions were predicted according to the principle of uniform design.The formation mechanism of blockage in gathering and transportation pipeline is analyzed and studied according to the chemical capacity analysis and X-ray fluorescence semi-quantitative analysis results of the blockages from different positions and the corrosivity evaluation of produced water.The results show that,Jurassic produced water at Wu 7 pressure increasing station has high carbonate content,it mainly forms CaCO_3 scale,and a certain amount of strontium barium sulfate scale would be also formed.The produced water from Yan 4+5 layer is incompatible with the produced water from Yan 10 layer,so they should be transported separately.Triassic produced water at Wu 8 pressure increasing station has high sulfate content,it mainly forms strontium barium sulfate scale,and the optimum volume ratio of produced water from Chang 2,Chang 4+5 and Chang 6 layers is 2∶47.5∶14.The analysis results of blockage at Wu 7 and Wu 8 pressure increasing stations are basically consistent with the prediction results of scaling trend,and the high content of Fe ions in blockage is mainly caused by serious corrosion.The blockage in the gathering and transportation pipelines of multi-layer development wells in Wuding block is mainly inorganic matter blockage caused by the interaction of scaling and corrosion.
引文
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[2] PIETRO Poesio,GIJS Ooms.Acoustic removal of colloidal particles from Berea sandstone[C].SPE International Symposium and Exhibition on Formation Damage Control,86490.
[3] 马丽萍,黎晓茸,谭俊领,等.CO2驱过程中碳酸盐溶蚀和地层水结垢趋势实验研究[J].西安石油大学学报(自然科学版),2016,31(5):68-72.MA Liping,LI Xiaorong,TAN Junling,et al.Experimental study on dissolution of carbonate and scaling tendency of formation water in CO2 flooding[J].Journal of Xi'an Shiyou University(Natural Science Edition),2016,31(5):68-72.
[4] 李伟翰,颜红侠,王书英,等.近井地带解堵技术研究进展[J].油田化学,2005,22(4):381-384.LI Weihan,YAN Hongxia,WANG Shuying,et al.Research progress in unblocking technology in near-wellbore[J].Oilfield Chemistry,2005,22(4):381-384.
[5] 耿玉广,张伟,刘云,等.油井管杆腐蚀结垢原因分析及防治技术[J].腐蚀科学与防护技术,2015,27(3):305-309.GENG Yuguang,ZHANG Wei,LIU Yun,et al.Analysis of corrosion and scaling causes of oil well pipe and rod and prevention and control technology[J].Corrosion Science and Protection Technology,2015,27(3):305-309.
[6] LIU Xiaoyan,LI Jungang,ZHU Qianya,et al.The analysis and prediction of scale accumulation for water-injection pipelines in the Daqing Oilfield[J].Journal of Petroleum Science and Engineering,2009,66(3/4):161-164.
[7] MUHAMMAD S K,IBNELWALEED H,MOHAMED M,et al.Oilfield scale formation and chemical removal:a review[J].Journal of Petroleum Science and Engineering,2018,171(12):127-139.
[8] 国家石油和化学工业局.油田水分析方法:SY/T 5523-2016[S].北京:中国标准出版社,2016.
[9] 国家能源局.油田水结垢趋势预测:SY/T 0600-2009[S].北京:石油工业出版社,2009.
[10] 王元.均匀设计:一种试验设计方法[J].科学导报,1994(5):20-22.WANG Yuan.Uniform design:a test design method[J].Science Herald,1994(5):20-22.
[11] 方开泰.均匀设计与均匀设计表[M].北京:科学出版社,1994.FANG Kaitai.Uniform Design and Uniform Design Table[M].Beijing:Science Press,1994.
[12] 国家石油和化学工业局.水腐蚀性测试方法:SY/T0026-1999[S].北京:石油工业出版社,1999.
[13] 王祥之.回归分析中的相关性的实例剖析[J].教育现代化,2017,16(4):104-105,107.WANG Xiangzhi.An example analysis of correlation in regression analysis[J].Education Modernization,2017,16(4):104-105,107.
[14] REFAIT Ph,ABDELMOULA M,GENIN J M R,et al.Mechanisms of formation and structure of green rust in aqueous corrosion of iron in the presence of chloride ions[J].Corrosion Science,1998,40(9):1547-1560.
[15] 王成达,严密林,赵新伟,等.油气田开发中 H2S / CO2腐蚀研究进展[J].西安石油大学学报(自然科学版),2005,20(5):66-70.WANG Chengda,YAN Milin,ZHAO Xinwei,et al.Research progress of H2S /CO2 corrosion in oil and gas field development[J].Journal of Xi'an Shiyou University(Natural Science Edition),2005,20(5):66-70.
[16] 张学元,王凤平,杜元龙.铁在二氧化碳溶液中的腐蚀电化学行为研究[J].中国腐蚀与防护学报,2009,19(2):72-78.ZHANG Xueyuan,WANG Fengping,DU Yuanlong.Electrochemical behavior of iron corrosion in carbon dioxide solution[J].Chinese Journal of Corrosion and Protection,2009,19(2):72-78.
[17] NORDSVEEN M,NESIC S,NYBORG R,et al.A mechanistic model for carbon dioxide corrosion of mild steel in the presence of protective iron carbonate films Part 1:theory and verification[J].Corrosion,2003,59(5):443-456.
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