渤海A油田注水井压力上升原因及对策研究
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摘要
渤海A油田注水开发过程中,注水井逐渐出现压力升高、注水不足现象。为此,在注入水水质及注入压力资料调研与分析的基础上,开展注水井堵塞机理研究,从注入水水质、结垢和腐蚀、配伍性分析以及微粒运移和出砂等方面,分析了注水压力上升原因,并针对此开展注水井解堵技术实验研究。结果表明,注入水中固悬物、粒径中值、含油量均超标,从而引起堵塞;溶解氧含量、总铁含量,细菌等均超标,导致注水过程中结垢和腐蚀管线,造成水井堵塞;复合酸体系7较好地解堵增油效果,可为A油田注水井的解堵增油提供可靠的技术保障。
In the process of water flooding development in Bohai A oilfield, the phenomenon of rising pressure and insufficient injection gradually appeared. On the basis of investigation and analysis of the water quality and injection pressure data, the plugging mechanism of water injectors has been studied. The reasons for the pressure rising of injectors wellhead pressure were found out from the aspects of excessive water injection quality, scaling and corrosion leading to blockage, compatibility analysis, particle migration and sand production. And then, the experimental research on the plugging removal technique of water injectors was carried out. The results showed that the solids, median particle sizes and oil content in the injected water exceeded the standard, which caused blockage. Dissolved oxygen content, total iron content, bacteria and so on exceed the standard, resulting in scaling and corrosion pipeline in the process of water injection, leading to water injectors blockage. The compound acid system can effectively remove plugging and increase oil production, which can provide reliable technical support for the plugging removal and increase oil production in A oilfield.
In the process of water flooding development in Bohai A oilfield, the phenomenon of rising pressure and insufficient injection gradually appeared. On the basis of investigation and analysis of the water quality and injection pressure data, the plugging mechanism of water injectors has been studied. The reasons for the pressure rising of injectors wellhead pressure were found out from the aspects of excessive water injection quality, scaling and corrosion leading to blockage, compatibility analysis, particle migration and sand production. And then, the experimental research on the plugging removal technique of water injectors was carried out. The results showed that the solids, median particle sizes and oil content in the injected water exceeded the standard, which caused blockage. Dissolved oxygen content, total iron content, bacteria and so on exceed the standard, resulting in scaling and corrosion pipeline in the process of water injection, leading to water injectors blockage. The compound acid system can effectively remove plugging and increase oil production, which can provide reliable technical support for the plugging removal and increase oil production in A oilfield.
引文
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[11]冷严,戴文英,赵增义,等.彩133井区西山窑组油藏储层敏感性特征及注水防膨评价[J].天然气勘探与开发,2011,34(1):32–35.
[12]刘美遥,李海涛,谢崇文,等.JX1-1油田沙河街储层注入水与储层配伍性研究[J].石油与天然气化工,2015,44(2):86–90.
[2]聂新村,许大星.渤南低渗透油田注水井欠注层伤害研究[J].油气地质与采收率,2004,11(3):66–67.
[3]李海涛,王永清,谭灿.砂岩储层清水和污水混注对储层损害的实验评价[J].石油学报,2007,28(2):137–143.
[4]龙媛媛,张春茂,吕德东,等.油田流动污水介质中溶解氧对A3钢腐蚀行为的影响[J].管道技术与设备,2006,(4):37–38.
[5]寇永强,贾江鸿,程远方.港西油田采出水对套管钢的腐蚀试验研究[J].油气储运,2010,29(2):133–136.
[6]刘威,郑润芬,智春生.呼伦贝尔油田注水系统腐蚀机理探讨[J].油气田地面工程,2015,34(9):26–27.
[7]樊世忠,窦红梅.保护油气层技术发展趋势[J].石油勘探与开发,2001,28(1):78–84.
[8]朱德武,刘文臣,朱正刚.低渗油田注水过程中储层保护技术研究[J].断块油气田,2008,15(1):101–104.
[9]张光明,汤子余,姚红星,等.注入水水质对储层的伤害[J].石油钻采工艺,2004,26(3):46–48.
[10]张兴,黄敏,卢明昌,等.盐家油田油水井结垢原因探讨[J].油田化学,2006,23(1):19–22.
[11]冷严,戴文英,赵增义,等.彩133井区西山窑组油藏储层敏感性特征及注水防膨评价[J].天然气勘探与开发,2011,34(1):32–35.
[12]刘美遥,李海涛,谢崇文,等.JX1-1油田沙河街储层注入水与储层配伍性研究[J].石油与天然气化工,2015,44(2):86–90.