变频电磁场对NaCl溶液结晶过程的影响研究
发布时间：2018-08-06 18:43
【摘要】：对于国内一些油气田,如中原油田、江汉油田、长庆油田等,它们一些油气井管道结垢的主要成分是NaCl。由于NaCl稳定的化学性质,NaCl盐垢很难用化学方法清除。但是根据一些理论和NaCl溶液本身的性质,可以推断变频电磁场能够有效的减少NaCl结晶析出。本文主要工作是,研究受到不同频率、电流或波形的电磁场处理后,NaCl溶液放置一段时间后由于挥发而析出NaCl晶体的析出量的变化,放置入NaCl溶液的NaCl盐块的被溶解质量的变化,由于电磁场处理而使NaCl溶液内部分子或离子之间的相互作用发生改变而在宏观上表现的表面张力系数的变化、电导率的变化和NaCl液滴挥发后的剩余的NaCl晶体的结晶图案的变化,以及受电磁场处理后NaCl溶液的激光拉曼荧光光谱所发生的变化。在这六个方面的基础上,分析变频电磁场的频率、电流或波形对NaCl溶液结晶过程的影响规律。本文得出如下结论:(1)对于频率实验,正弦波频率选取25kHz,方波频率选取20-25kHz时,电磁场对NaCl溶液结晶过程的影响最大:NaCl溶液蒸发析出的结晶晶体质量受电磁场的影响而减少的幅度最大(正弦波-28.57%,方波-20.00%),NaCl溶液对Na Cl盐块溶解的质量受电磁场的影响而增加的幅度最大(正弦波17.08%,方波6.67%),NaCl溶液的表面张力系数受电磁场的影响而增大的幅度最大(正弦波7.35%,方波3.89%),NaCl结晶图案排列受电磁场的影响而趋向于聚集,方波的拉曼散射强度IR增大的幅度最大(六个拉曼峰IR变化率分别为1.09%,1.04%,1.03%,1.13%,1.06%,1.53%)。其原因推测是25kHz是特定频率,可能引起了NaCl溶液的共振。在该频率下,电磁场对NaCl溶液的影响被放大。(2)对于电流实验,随着电流的增大至仪器允许的最大电流1.4A,抑制NaCl晶体析出的能力增强(正弦波-18.18%),溶液溶解NaCl盐块的能力增强(正弦波13.23%,方波4.60%),表面张力系数增大(正弦波1.66%),拉曼谱的谱峰增大(正弦波三个拉曼峰IR变化率分别为1.17%,1.18%,1.20%)。如果要增强电磁场对NaCl溶液的影响,增加NaCl的溶解度,那么需要增大对应的电磁场的电流值。由于电流越强,电磁场对NaCl溶液的影响就越强,NaCl溶液各项属性的变化就越明显。(3)对于25kHz1.0A的波形实验,如果要电磁场处理使NaCl溶液结晶过程尽量被抑制,则波形可以相对于三角波,选取正弦波和方波更合适。
[Abstract]:For some oil and gas fields in China, such as Zhongyuan Oilfield, Jianghan Oilfield, Changqing Oilfield and so on, the main component of scaling in some oil and gas wells is NaClCl. Because of the stable chemical property of NaCl, it is difficult to remove the salt scale by chemical method. However, based on some theories and the properties of NaCl solution, it can be concluded that the frequency conversion electromagnetic field can effectively reduce the precipitation of NaCl crystals. The main work of this paper is to study the variation of the amount of precipitation of NaCl crystal after the treatment of electromagnetic field with different frequencies, currents or waveforms for a period of time, and the change of the dissolved quality of the NaCl salt block placed into the NaCl solution. Because of the electromagnetic field treatment, the interaction between molecules or ions in NaCl solution is changed, and the surface tension coefficient, conductivity and the crystal pattern of the remaining NaCl crystal after the volatilization of NaCl droplets are changed. And the changes of laser Raman fluorescence spectra of NaCl solution treated by electromagnetic field. On the basis of these six aspects, the influence of frequency, current or waveform of frequency conversion electromagnetic field on the crystallization process of NaCl solution is analyzed. The conclusions are as follows: (1) for the frequency experiment, when the sinusoidal frequency is 25 kHz and the square wave frequency is 20-25kHz, The effect of electromagnetic Field on the Crystallization process of NaCl solution the largest effect of electromagnetic Field on the quality of crystalline crystals precipitated by evaporation of NaCl solution decreases the largest (sinusoidal wave -28.57, square wave -20.00%) the mass of dissolution of NaCl solution to NaCl salt is affected by electromagnetic field. The surface tension coefficient of NaCl solution is affected by electromagnetic field and the amplitude is the largest (sine wave 7.35%, square wave 3.89%). The crystal pattern arrangement of NaCl tends to aggregate due to the influence of electromagnetic field. The intensity of Raman scattering of square waves increases by the largest amplitude (the IR variation rates of the six Raman peaks are 1.09% and 1.04%, respectively) and 1.133.1.136% and 1.53%, respectively. The reason is that 25kHz is a specific frequency, which may cause the resonance of NaCl solution. At this frequency, the effect of electromagnetic field on NaCl solution is amplified. (2) for current experiment, With the increase of current to the maximum current of 1.4A allowed by the instrument, the ability to inhibit the precipitation of NaCl crystal (sinusoidal wave -18.18%), the ability of solution to dissolve NaCl salt block (sine wave 13.23%, square wave 4.60%), the increase of surface tension coefficient (sine wave 1.66%), The spectral peak increases (the IR variation rate of the three Raman peaks of sine wave is 1.17 and 1.18% respectively). If we want to enhance the effect of electromagnetic field on NaCl solution and increase the solubility of NaCl, we need to increase the current value of corresponding electromagnetic field. The stronger the current is, the stronger the effect of electromagnetic field on NaCl solution is. (3) for the experiment of 25kHz1.0A waveform, the crystallization process of NaCl solution is restrained by electromagnetic field treatment. Then the waveform can be compared to the triangle wave, the selection of sine wave and square wave is more appropriate.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358.5;O441.4
本文编号：2168649
[Abstract]:For some oil and gas fields in China, such as Zhongyuan Oilfield, Jianghan Oilfield, Changqing Oilfield and so on, the main component of scaling in some oil and gas wells is NaClCl. Because of the stable chemical property of NaCl, it is difficult to remove the salt scale by chemical method. However, based on some theories and the properties of NaCl solution, it can be concluded that the frequency conversion electromagnetic field can effectively reduce the precipitation of NaCl crystals. The main work of this paper is to study the variation of the amount of precipitation of NaCl crystal after the treatment of electromagnetic field with different frequencies, currents or waveforms for a period of time, and the change of the dissolved quality of the NaCl salt block placed into the NaCl solution. Because of the electromagnetic field treatment, the interaction between molecules or ions in NaCl solution is changed, and the surface tension coefficient, conductivity and the crystal pattern of the remaining NaCl crystal after the volatilization of NaCl droplets are changed. And the changes of laser Raman fluorescence spectra of NaCl solution treated by electromagnetic field. On the basis of these six aspects, the influence of frequency, current or waveform of frequency conversion electromagnetic field on the crystallization process of NaCl solution is analyzed. The conclusions are as follows: (1) for the frequency experiment, when the sinusoidal frequency is 25 kHz and the square wave frequency is 20-25kHz, The effect of electromagnetic Field on the Crystallization process of NaCl solution the largest effect of electromagnetic Field on the quality of crystalline crystals precipitated by evaporation of NaCl solution decreases the largest (sinusoidal wave -28.57, square wave -20.00%) the mass of dissolution of NaCl solution to NaCl salt is affected by electromagnetic field. The surface tension coefficient of NaCl solution is affected by electromagnetic field and the amplitude is the largest (sine wave 7.35%, square wave 3.89%). The crystal pattern arrangement of NaCl tends to aggregate due to the influence of electromagnetic field. The intensity of Raman scattering of square waves increases by the largest amplitude (the IR variation rates of the six Raman peaks are 1.09% and 1.04%, respectively) and 1.133.1.136% and 1.53%, respectively. The reason is that 25kHz is a specific frequency, which may cause the resonance of NaCl solution. At this frequency, the effect of electromagnetic field on NaCl solution is amplified. (2) for current experiment, With the increase of current to the maximum current of 1.4A allowed by the instrument, the ability to inhibit the precipitation of NaCl crystal (sinusoidal wave -18.18%), the ability of solution to dissolve NaCl salt block (sine wave 13.23%, square wave 4.60%), the increase of surface tension coefficient (sine wave 1.66%), The spectral peak increases (the IR variation rate of the three Raman peaks of sine wave is 1.17 and 1.18% respectively). If we want to enhance the effect of electromagnetic field on NaCl solution and increase the solubility of NaCl, we need to increase the current value of corresponding electromagnetic field. The stronger the current is, the stronger the effect of electromagnetic field on NaCl solution is. (3) for the experiment of 25kHz1.0A waveform, the crystallization process of NaCl solution is restrained by electromagnetic field treatment. Then the waveform can be compared to the triangle wave, the selection of sine wave and square wave is more appropriate.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358.5;O441.4
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