A油田酸化解堵液及其对应酸化缓蚀添加剂优选
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摘要
为了清除岩石孔道中堆积的固形堵塞物,恢复储层渗透率,对酸化解堵液及其对应酸化缓蚀添加剂进行研究。选用HCl、HF、HBF4溶解岩心粉末,得出固形堵塞物溶解剂最佳浓度;通过酸化缓蚀剂与解堵液混和后对金属的腐蚀试验,筛选酸化缓蚀剂配方。实验表明,5%HCl+2%HF+3%HBF4混合酸液对岩心粉末的溶解率为16.93%,有良好的溶解效果;酸化解堵液对挂片的腐蚀很严重,其空白样的腐蚀速率远远大于标准规定腐蚀速率2.0 g/(m~2·h)的要求,若不加药剂防腐,井下设备必将被腐蚀;腐蚀速率随着酸化缓蚀剂HSSD-1的浓度升高而降低,当浓度升高到某一阈值后,药剂对腐蚀控制能力变弱,曲线趋于平缓;当HSSD-1缓蚀剂浓度为2.0%时,腐蚀速率为1.487 3 g/(m~2·h),其腐蚀速率低于标准要求,缓蚀效果良好,能够满足油田要求。
In order to remove solid blockages accumulated in rock channels and restore reservoir permeability, acidizing plugging removal fluid and acidizing corrosion inhibition additives were studied. To use HCl, HF and HBF4 dissolves core powder, and their optimum concentration is determined. The formulation of acidizing inhibitor was screened through the corrosion experiments of mixing fluid of acidizing corrosion inhibitor with plugging removal solution to metal. The experimental results show that the mixed acid solution of 5%HCl + 2% HF + 3% HBF4 has good dissolution effect on core powder, and the dissolution rate is 16.93%. The corrosion rate of acidizing plug-removal solution is much higher than that in standard 2.0 g/(m~2·h). If there is no corrosion inhibitor, the underground equipment will be seriously corroded. The corrosion rate of acidizing plugging removal fluid decreases with the increase of the concentration of corrosion inhibitor HSSD-1, and when the concentration reaches a certain threshold, the corrosion rate curve tends to be flat. When the mass fraction of corrosion inhibitor HSSD-1 is 2.0%, the corrosion rate is 1.487 3 g/(m~2·h), which is below the standard requirement and can meet the requirements of oilfield.
In order to remove solid blockages accumulated in rock channels and restore reservoir permeability, acidizing plugging removal fluid and acidizing corrosion inhibition additives were studied. To use HCl, HF and HBF4 dissolves core powder, and their optimum concentration is determined. The formulation of acidizing inhibitor was screened through the corrosion experiments of mixing fluid of acidizing corrosion inhibitor with plugging removal solution to metal. The experimental results show that the mixed acid solution of 5%HCl + 2% HF + 3% HBF4 has good dissolution effect on core powder, and the dissolution rate is 16.93%. The corrosion rate of acidizing plug-removal solution is much higher than that in standard 2.0 g/(m~2·h). If there is no corrosion inhibitor, the underground equipment will be seriously corroded. The corrosion rate of acidizing plugging removal fluid decreases with the increase of the concentration of corrosion inhibitor HSSD-1, and when the concentration reaches a certain threshold, the corrosion rate curve tends to be flat. When the mass fraction of corrosion inhibitor HSSD-1 is 2.0%, the corrosion rate is 1.487 3 g/(m~2·h), which is below the standard requirement and can meet the requirements of oilfield.
引文
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[3]刘建新,张营华,任韶然.阳离子聚合物在多孔介质中的水动力学吸附[J].石油化工高等学校学报,2009,22(1):41-44.
[4]吴春华.某开发区聚合物化学降解剂配方研究[J].石油化工高等学校学报,2017,30(4):38-42.
[5]许洪星,蒲春生,赵树山,等.大功率超声波近井石蜡沉积处理实验与应用[J].西南石油大学学报(自然科学版),2011,33(5):146-151,202.
[6]张荣明,马冬晖,张振宇.注聚井学增注剂的合成与性能研究[J].石油化工高等学校学报,2011,24(5):10-13.
[7]谢朝阳,李国,王鑫,等.大庆油田注聚井解堵增注技术[J].大庆石油地质与开发,2003,22(6):57-59.
[8]卢祥国,陈会军,单明涛.大庆油田北二区西部注聚井堵塞原因及预防措施[J].油田化学,2002,19(3):257-259.
[9]宋爱莉,孙林,朱洪庆,等.Sz36-1油田缔合聚合物驱堵塞物形成机理分析[J].石油钻采工艺,2011,33(1):83-87.
[10]孟向丽,赵立强,徐昆,等.注聚合物井堵塞原因和解堵技术[J].石油钻采工艺,2011,33(3):70-73.
[11]杨树坤,王冠华,李翔,等.复合有机解堵技术研究及其在渤海油田的应用[J].石油化工应用,2016,35(4):36-38.
[12]陈腾巍,杨欢,张黄鹤.水溶性离子对聚合物-有机铬凝胶体系性能的影响研究[J].长江大学学报(自科版),2015,12(19):11-15.