共查询到19条相似文献,搜索用时 187 毫秒
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在油气田开发过程中,结垢现象是一个不可忽视的严重问题。通过对苏203井区结垢情况调研、垢样成分分析,室内开展了解堵剂配方的研制及评价。研究结果表明,苏203井区结垢现象严重,最大结垢速率达11.11mm/a。垢样成分比较复杂,含Ba SO4、Ca SO4等酸不溶垢和Ca CO3垢、腐蚀产物Fe CO3、FexSy等。通过配伍性评价、缓蚀剂筛选、起泡剂筛选和溶垢能力评价等实验,确定酸溶垢解堵剂QJDC配方和酸不溶垢解堵剂QJDB配方。其中,解堵剂QJDC最大溶垢率为87.49%。解堵配方QJDB对Ba SO4和Ca SO4的溶垢率分别为70.89%和72.35%,溶垢效果较好。 相似文献
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硫酸盐垢是油田结垢控制中遇到的最难解决的问题之一。通过对某油田垢样进行X射线衍射分析,结果显示,垢样主要成分为63.70%的Ba SO4、16.70%的Sr SO4。针对垢样的成分特点,采用以EDTA为主剂,低分子量聚丙烯酸钠为辅剂的除垢剂。考察了聚丙烯酸钠分子量、浓度、温度、p H值和盐浓度等因素对溶垢率的影响,结果表明,低分子量聚丙烯酸钠的加入提高了EDTA的除垢速度。在EDTA浓度为30%,聚丙烯酸钠分子量为3 000且浓度为1%,溶垢温度为80~100℃,p H为12时除垢效果最好。 相似文献
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测定了420-505K温度范围内,对苯二甲酸和对羧基苯甲醛在醋酸水溶液中溶解度。在70%-100%醋酸水溶液中,70%醋酸使对苯二甲酸的溶解度对温度最敏感,随着醋酸浓度增加,对苯二甲酸的溶解度减少。当温度低于470K时,对苯二甲酸在水中的溶解性低于醋酸中的溶解度;温度高于470K时,对苯二甲酸在水中的溶解性对温度敏感明显提高。40%醋酸使对羧基苯甲醛的溶解度对温度最敏感, 随着醋酸浓度增加, 对羧基苯甲醛的溶解度增加。实验数据用修正的Apelblat方程进行了对苯二甲酸和对羧基苯甲醛在醋酸水溶液中溶解度关联,计算与实验值吻合良好。 相似文献
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The knowledge of solubility of a salt in either the pure solvent or blend solvent is of great importance for studying or operating the crystallization, extraction, and distillation processes. The solubility of sodium acetate (NaAc) in four pure solvents (water, ethanol, acetic acid and 2,2,2-trifluoroethanol) and four binary solvents (water–ethanol, water-acetic acid, acetic acid–ethanol, and acetic acid-ethyl acetate) were measured by using the laser dynamic method at temperatures from 288.15 K to 338.15 K at 0.1 MPa. The results showed that the solubility of NaAc was influenced by either the solution temperature or solvent composition. The aqueous sodium acetate solution possessed the maximal solubility under the experimental conditions. The solubility of NaAc in 2,2,2-trifluoroethanol was found to be decreased with the increase of the solution temperature. While, the solubilities of NaAc in other seven solvents increased as the solution temperature was elevated. Besides, five correlation models, including the van't Hoff model, modified Apelblat model, Yaws model, λh model, and modified Apelblat-Jouyban-Acree model were used to correlate the solubility data of those sodium acetate solutions with acceptable deviation, respectively. Finally, van't Hoff analysis method was selected to analyze the change law of thermodynamic properties of a salt during the dissolution process. 相似文献
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The solubility of D-xylose in formic acid and binary solvents of formic acid with formic acid and acetic acid, propionic acid, n-butyric acid or isobutyric acid was measured in the temperature range from 300.35 to 325.05 K using the synthetic method by a laser monitoring technique at atmospheric pressure. The solid-liquid equilibrium data will provide essential support for industrial design and further theoretical study. The experimental data show that the solubility of D-xylose in formic acid and in the mixtures of formic acid+acetic acid (1︰1), formic acid+propionic acid (1︰1), formic acid+n-butyric acid (1︰1), and formic acid+isobutyric acid (1︰1) increases with temperature. The Apelblat equation, theλh model, and the ideal solution equation correlate the solubility data well. 相似文献
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The solubilities of isophthalic acid (1) in binary acetic acid (2)+water (3) solvent mixtures were determined in a pressurized vessel. The temperature range was from 373.2 to 473.2K and the range of the mole fraction of acetic acid in the solvent mixtures was from x2 0 to 1. A new method to measure the solubility was developed, which solved the problem of sampling at high temperature. The experimental results indicated that within the temperature range studied, the solubilities of isophthalic acid in all mixtures showed an increasing trend with increasing temperature. The experimental solubilities were correlated by the Buchowski equation, and the calculate results showed good agreement with the experimental solubilities. Furthermore, the mixed solvent systems were found to exhibit a maximum solubility effect on the solubility, which may be attributed to the intermolecular association between the solute and the solvent mixture. The maximum solubility effect was well modeled by the modified Wilson equation. 相似文献
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固体防垢块的研制 总被引:3,自引:0,他引:3
研究了以膦酸盐防垢剂为主要材料的、可悬挂于抽油泵下面使用的固体防垢块。防垢块主要由防垢剂、胶结剂组成。羟基亚乙基二膦酸(HEDP)防垢性能和热稳定性较好,可用作固体块中的防垢剂。固体块中的胶结剂由塑料构成。通过比较塑料的熔点和在柴油中的溶解性能,认为塑料00和DFDA7042可以分别用作低温(70℃以下)、高温(70~90℃)固体防垢块的胶结剂。单纯将塑料00和HEDP粉末制成固体块,由于防垢材料和胶结材料的极性差别较大,造成防垢剂颗粒不能被充分包裹,使固体块中的防垢剂在驱替过程中较快溶于水中,达不到缓释效果。通过加入塑料改性剂YHSL,调节防垢材料和胶结剂材料的极性,可制成具有缓释功能的固体防垢块。 相似文献
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以马来酸酐和氨合成聚天冬氨酸(PASP),探讨了物料比、反应温度对PASP收率的影响,评价了PASP的水溶性、生物降解性和防垢性能。结果表明,在原料马来酸酐与氨的物质的量比为1.0∶1.2条件下,温度为200℃时,PASP的收率为95.22%,分子量22 000,水溶性好;在26~28℃条件下降解30 d后,3%浓度PASP溶液的相对粘度为1.013,有较好的生物降解性;当Ca2+为400 mg/L,Ba2+为200 mg/L,pH=7.0,50~60℃恒温8 h,PASP用量为15 mg/L时,对碳酸钙、硫酸钡、硫酸钙的阻垢率接近100%。 相似文献