周祥,逄建鑫,叶正荣,武冬明,伊然,崔晓东,刘翔,孙建波,孙冲.油田采出水模拟溶液中咪唑啉类缓蚀剂残余浓度检测技术[J].表面技术,2022,51(9):188-196.
ZHOU Xiang,PANG Jian-xin,YE Zheng-rong,WU Dong-ming,YI Ran,CUI Xiao-dong,LIU Xiang,SUN Jian-bo,SUN Chong.Residual Concentration Detection of Imidazoline Corrosion Inhibitor in Simulated Formation Water of Oilfield[J].Surface Technology,2022,51(9):188-196 |
| 油田采出水模拟溶液中咪唑啉类缓蚀剂残余浓度检测技术 |
| Residual Concentration Detection of Imidazoline Corrosion Inhibitor in Simulated Formation Water of Oilfield |
| |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.019 |
| 中文关键词: 咪唑啉类缓蚀剂 残余浓度检测 紫外–可见分光光度法 矿化度 pH Fe3+ |
| 英文关键词:imidazoline corrosion inhibitor residual concentration detection ultraviolet-visible spectrophotometry salinity pH Fe3+ |
| 基金项目:国家科技重大专项(2016ZX05016–004);中央高校基本科研业务费专项资金项目(20CX06075A) |
|
|
| Author | Institution |
| ZHOU Xiang | Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
| PANG Jian-xin | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
| YE Zheng-rong | Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
| WU Dong-ming | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
| YI Ran | Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
| CUI Xiao-dong | Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
| LIU Xiang | Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
| SUN Jian-bo | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
| SUN Chong | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 确立一种用于油田采出水中咪唑啉类缓蚀剂残余浓度检测的技术方法。方法 采用紫外–可见分光光度法测量了咪唑啉类缓蚀剂的紫外吸收光谱和吸光度，研究了油田采出水模拟溶液中矿化度、pH值及Fe3+等对缓蚀剂吸光度的影响，分析了不同因素影响下缓蚀剂浓度与吸光度之间的相关性。结果 采出水矿化度的变化及Na+、K+、Ca2+、Mg2+、Cl‒、SO42‒、HCO3‒等离子的存在对缓蚀剂的吸光度值影响很小，对缓蚀剂浓度检测的影响轻微。然而，采出水中可能存在的悬浮物对缓蚀剂吸光度的测量具有显著影响，检测之前需要对采出水进行过滤处理。在碱性环境中pH值的变化(7~11)对缓蚀剂的吸光度基本无影响，而在酸性介质中pH值的变化(2.5~7)导致缓蚀剂的吸光度在–0.02~0.02范围内波动，引起的缓蚀剂浓度检测误差约为±5 mg/L。采出水中可能存在的Fe3+对缓蚀剂吸光度的测量影响很大，在缓蚀剂浓度检测过程中需要消除Fe3+对吸光度测量的干扰。结论 提出了油田采出水中咪唑啉类缓蚀剂残余浓度检测技术方案:取缓蚀剂样品配制至少2种浓度的缓蚀剂溶液，测定特征吸收峰波长λ和吸光度A，确定缓蚀剂浓度与吸光度的关系式A=kC;取未知浓度缓蚀剂采出水样;过滤处理;采用紫外–可见分光光度法在波长λ处测量水样吸光度A;Fe3+检测及浓度 测定;不含Fe3+时，依据CR=A/k计算缓蚀剂残余浓度CR，含有Fe3+时，依据 计算缓蚀剂残余浓度CR。 |
| 英文摘要: |
| The corrosion inhibitor has been widely used to mitigate the corrosion of carbon steel in oil and gas industry. The effective concentration of corrosion inhibitor inevitably decreases with the prolongation of its service time in oilfield environment, thereby affecting its anti-corrosion effect. It, thus, puts forwards an urgent demand for the residual concentration detection technology of corrosion inhibitor in oilfield. The primary objective of this study is to determine a feasible method used for the residual concentration detection of imidazoline corrosion inhibitor in oilfield. In this regard, the ultraviolet absorption spectrum and absorbance of imidazoline corrosion inhibitor were measured by ultraviolet-visible spectrophotometry in the solution with various salinity, pH and Fe3+ concentration. The effects of the salinity of the simulated formation water, pH and Fe3+ on the absorbance of corrosion inhibitor were investigated and meanwhile, how the above factors affecting the relationship between inhibitor concentration and absorbance were analyzed. The results show that the variation of the salinity of produced water as well as the presence of ions such as Na+, K+, Ca2+, Mg2+, Cl‒, SO42‒ and HCO3‒ rarely affects the absorbance of corrosion inhibitor, which does not disturb the detection on the inhibitor concentration. However, the potential suspended substance in produced water has significant influence on the absorbance measurement of corrosion inhibitor. Therefore, the produced water needs to be filtered prior to the detection on inhibitor concentration. The change of pH in the range of 7 to 11 has no obvious effect on the absorbance of corrosion inhibitor while that in the range of 2.5 to 6 results in the fluctuation of absorbance within –0.02-0.02, which can cause the small detection error of about ±5 mg/L for the corrosion inhibitor. The influence of the possible Fe3+ in produced water on the absorbance measurement of corrosion inhibitor is very huge. It is necessary to eliminate the interference of Fe3+ on the absorbance measurement of corrosion inhibitor when conducting the inhibitor concentration detection on the produced water containing Fe3+. A feasible method to implement the residual concentration detection of imidazoline corrosion inhibitor in the formation water of oilfield is proposed as follows:taking the corrosion inhibitor sample to prepare at least two solution with different inhibitor concentrations, measuring the wavelength (λ) of characteristic absorption peak and the absorbance (A) to determine the relationship between inhibitor concentration and absorbance (A=kC); taking the produced water sample with unknown concentration of corrosion inhibitor; filtering the water sample; measuring the A of water sample at λ by means of ultraviolet-visible spectrophotometry; detecting Fe3+ and measuring its concentration (CFe3+); calculating the residual concentration of corrosion inhibitor (CR) according to the formula of CR=A/k in produced water without Fe3+ or determining CR according to the formula of CR=(A–0.056 5CFe3+)/k in produced water with Fe3+. The detection error of the proposed method is less than 10 mg/L in the inhibitor concentration range of 0-300 mg/L, especially the lower the residual concentration of corrosion inhibitor in the produced water, the smaller the errors of the detected results. This work provides a potential strategy for the residual concentration detection of corrosion inhibitor in the formation water of oilfield. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号