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油田注入水碳酸钙垢结垢机理分析与结垢预测 总被引:25,自引:0,他引:25
CaCO3垢是油田注入水中主要的结垢类型,严重影响油田开发效果。通过4种水样在不同温度下的结垢试验及岩心驱替试验,研究CaCO3结垢机理并进行理论预测。结果表明:(1)未处理油田注入水结垢严重,且结垢程度随温度上升而加剧,90℃时Ca^2 ,Mg^2 下降率达52.3%;(2)岩心驱替试验显示,CaCO3晶体在岩石孔隙中和喉道表面均可析出;(3)处理后的水样位于CaCO3溶解度的介稳区,水质稳定,不会产生CaCO3垢;(4)理论预测与试验结果一致。表4参10(伊先清摘)。 相似文献
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循环冷却水在循环使用的过程中,往往在系统中产生结垢、腐蚀和生物粘泥。循环冷却水处理的任务是消除或减少结垢、腐蚀和生物粘泥的危害,使系统安全可靠地运行。结合扬子石化南京溶剂有限责任公司的循环冷却水处理设计的工程实例,具体说明。 相似文献
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姬塬油田注入水与地层水配伍性研究 总被引:1,自引:0,他引:1
姬塬长8储层在采用清水进行注水开发过程中,存在注水压力高、吸水指数低、注水见效慢、注采严重失衡等问题,严重影响油田开发效果。本文在对该区块注入水、地层产出水组成分析的基础上,将结垢趋势预测和室内模拟实验相结合,详细分析评价了注入水与地层水的配伍性。配伍性实验结果表明:姬塬长8储层地层水为CaCl2水型、注入水为Na2SO4水型;地层水与注入水以任意比例混合后,在30℃下均无垢生成,80℃下均产生了碳酸钙结垢而无硫酸钙垢形成。结垢趋势预测结果表明:在30℃下地层水与注入水混合后基本不生成碳酸钙垢;在50℃下,随着地层水比例的增加,碳酸钙结垢趋势增加,当地层水与注入水之比为4∶6 10∶0时,显示会有碳酸钙垢生成;在80℃下,碳酸钙垢趋势明显增加,地层水与注入水以任意比例混合后均会产生碳酸钙垢;在30℃、50℃、80℃下地层水与注入水以任意比例混合后均无硫酸钙垢结垢趋势存在。综上所述,姬塬长8储层注入水与地层水配伍性差、结垢是造成姬塬长8储层注水压力高的主要原因之一。 相似文献
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《Journal of Petroleum Science and Engineering》2001,29(2):85-95
Reliable prediction of calcium carbonate, CaCO3, scaling for estimating scale production oilfield production wells and surface facilities requires both thermodynamic models to indicate the tendency for scaling from solution and kinetic models to predict the rate of scaling and thus the time required to cause blockage. The application of such models could contribute to field scale management and in the development of more effective treatments of carbonate scale during oilfield production. The performance of a kinetic model for calcium carbonate scaling rate based on the measurements of individual calcite crystal growth rates is tested against scale deposition in tube blocking experiments using synthetic formation brines under pressure and temperature levels. The profile of the scale formed on the internal surface of the tube during the experiments was measured and compared with the predicted results from the kinetic model. The application of the kinetic model to the prediction of carbonate scaling in a North Sea well has also been tested. The results from the model are in good agreement with the actual scale profile recorded in the tubing by a downhole multi-finger caliper (MFC) tool. 相似文献
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综述了羧酸盐型聚合物、磺酸盐型聚合物和聚醚型聚合物3种无磷有机阻垢剂对碳酸钙、磷酸钙的阻垢性能和阻垢机理,从结构和阻垢性能的关系方面探讨了3类阻垢剂的阻垢特点。羧酸根与碳酸钙晶体表面的钙离子螯合,使碳酸钙晶体畸变为松散结构,抑制了碳酸钙的结垢;羧酸根与磺酸根或聚乙烯氧基链的协同作用抑制了磷酸钙的结垢。其中,羧酸根通过螯合作用锚定在无定型磷酸钙纳米颗粒的表面,磺酸根使无定型磷酸钙带负电荷从而分散磷酸钙垢,聚乙烯氧基链增加了磷酸钙的溶解性。对无磷有机阻垢剂的发展趋势进行了展望。 相似文献
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Abstract This article presents the prediction of calcium carbonate and calcium sulfate scale formation by water injection in oilfields at different mixing injection water-to-formation water ratios. The experimentally measured chemical analyses of formation water and injection water were input to the OLI ScaleChem model to determine the tendency of scale formation. The scaling tendency of CaCO3 and CaSO4 at reservoir temperatures and pressures is presented. This model has been applied to investigate the potential of calcium carbonate and calcium sulfate scale precipitation in Iranian oilfields in onshore and offshore fields as a method of secondary recovery or reservoir pressure maintenance. 相似文献
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以Oddo-Tomson饱和指数法和硅钼黄法测定低聚硅为基础,研究了大庆油田强碱三元复合驱区块的温度、压力、pH值和离子强度等因素对CaCO3垢和硅垢沉积的影响规律;采用多项式函数和MATLAB中exponention函数对钙、硅混合垢沉积数据进行拟合,建立了钙、硅混合垢沉积预测方程,并结合成垢离子数据、pH值等,建立了大庆油田三元复合驱钙、硅混合垢各阶段结垢的量化预测方法。针对不同油藏区块,通过水驱空白CaCO3饱和指数值和低聚硅理论饱和值对三元复合驱混合垢预测模型进行修正,可以提高结垢预测准确率;对大庆油田喇北东区33口井和南五区39口井进行结垢预测验证,钙、硅混合垢结垢预测的准确率分别为92.8%和89.6%。 相似文献
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The authors studied Bohai sea SZ36-1 oil field scaling conditions and analyzed its formation characteristics as well as injected water characteristics. According to the Oddo-Tomson saturation index, this oil field scale can be calcium carbonate scale and calcium sulfate scale. Research indicates that calcium carbonate (CaCO3) scale will form during the process of water injection, but calcium carbonate scale is not the main scaling type. With our own experiment measuring device and scale static and dynamic experimental evaluation data, the amount of actual scaling buildup can be calculated and the extent of the formation permeability damage caused by the amount of scaling buildup can also be studied. On this basis, the scale inhibitor can also be well selected. Conclusion of the study will help guide oil field water injection practice and reduce formation damage, and thereby enhance oil recovery. 相似文献
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闫方平 《石油与天然气化工》2011,40(4):375-380,325,326
我国东部老油田在注水开发后期都出现了较为严重的结垢现象。现场垢样分析和结垢趋势理论预测表明碳酸钙是主要垢型。频繁的酸化及检泵作业,易时地层、油套管和地面设施造成伤害,使用挤注防垢技术是一种新的尝试。本文描述了防垢剂挤注技术的室内实验、挤注方案设计及现场应用研究。在胜利油田和江苏油田的三个目标区块的现场试验表明,井下挤注防垢技术是一种可行的现场施工工艺.操作过程简单,适用地层奈件范围广,可用于高温、高钙、低孔低渗的苛刻地层条件;与酸洗除垢的不同结合方式对挤注防垢效果无明显影响,实际作业时可根据不同的目标要求选择相应的结合方式;从源头防垢,有效期长,可显著提高油田的经济效益。 相似文献