钻井液用聚丙烯酰胺钾盐检测方法优化  

Study on Optimization of Method for Measuring the Content of Potassium Salt of Polyacrylamide in Drilling Fluids

作　　者：陈蕾旭 侯勇[3] 赵菲 刘翠微 史野 CHEN Leixu;HOU Yong;ZHAO Fei;LIU Cuiwei;SHI Ye(Tianjin Key Laboratory of Drilling Fluid Enterprise with Complex Conditions,Tianjin 300280;CNPC Bohai Drilling Engineering Company Limited,Tianjin 300280;Dagang Oilfield Testing Supervision and Evaluation Center,Tianjin 300280;Oil Well Cement and Additive Quality Supervision Testing Center for Petroleum Industry,Tianjin 300451)

机构地区：[1]天津市复杂条件钻井液企业重点实验室,天津300280 [2]渤海钻探工程有限公司,天津300280 [3]大港油田检测监督评价中心,天津300280 [4]石油工业油井水泥及外加剂质量监督检验中心,天津300451

出　　处：《钻井液与完井液》2021年第1期85-88,共4页Drilling Fluid & Completion Fluid

基　　金：天津市创新平台专项资助计划“非常规和深层油气资源开发钻井液关键技术研究”(19PTSYJC00120)。

摘　　要：聚丙烯酰胺钾盐是钻井液行业广泛应用的一种阴离子型聚合物。按照SY/T 5946—2002推荐方法进行检测过程中,存在无机盐对纯度的检测影响、特性黏数测定使用的易制爆化学品硝酸钠管理要求高、氯离子测定偏差较高等问题。在纯度检测的基础上采用乙醇加盐酸洗溶液,优化灼烧残渣的温度和时间,特性黏数测定使用氯化钠代替硝酸钠,氯离子含量测试优化样品处理和滴定pH值等方法和措施,提高聚丙烯酰胺钾盐技术指标检测的准确性。结果表明,纯洗溶液中加入1.5%盐酸,增加了含量无机盐的溶解,样品纯度甑别率提高40%;800℃灼烧3 h残渣含量能够较真实地体现样品的有效含量;采用氯化钠代替硝酸钠进行特性黏数测试,结果偏差范围为(0~0.40)/100 mL/g;氯离子测试过程中,高温灼烧处理样品,并增加了调整滴定溶液pH值,平行样间偏差由1.02%~1.73%降至0~0.18%之间。通过上述测试方法的优化,提高了聚丙烯酰胺钾盐技术指标检测结果的准确性和精确度,为该产品的质量控制提供了行之有效的检测依据。The potassium salt of polyacrylamide(PAM)is a widely used anionic polymer.In examining the quality of this polymer in accordance with the standard SY/T 5946-2002,several factors affect the final results,for example,the purity of the polymer is affected by inorganic salts existed in the process of examination,sodium nitrate used to measure the intrinsic viscosity is a kind of easy-to-explode substance and requires high level of control,and there is a big error in the determined chloride ions concentration.The procedure of examining the quality of the potassium salt of PAM was modified in our laboratory experiment.In measuring the purity of the polymer in laboratory,ethanol and hydrochloric acid as the washing liquid.The temperature and time for residue ignition were optimized.Sodium chloride was used to replace the sodium nitrate in measuring the intrinsic viscosity.In measuring the chloride ions content,the treatment of the sample was optimized and the pH of the sample was measured with titration method.All these measures helped improve the accuracy of the examination.It was found in the experiment that by adding 1.5%hydrochloric acid in the pure washing liquid,the solubility of the inorganic salt in the sample was increased,and the parting rate of the purity of the sample was thus increased by 40%.The residue of the sample was ignited at 800℃for 3 hours,in so doing the real effective content of the sample can be measured.When using NaCl to replace NaNO3 in the measurement of the intrinsic viscosity,the range of variation of the results was(00.40)/100 mL/g.In the measurement of chloride ions concentration,the sample was ignited at elevated temperatures and the pH value of the titration solution was adjusted,thus the variation of the results between parallel measurements was reduced from 1.02%-1.73%to 0.0018%.These optimization measures help improve the accuracy and precision of the measurement,providing an effective base for examining the product quality of the potassium salt of PAM.

关 键 词：聚丙烯酰胺钾盐 纯度 灼烧残渣 特性黏数 氯离子含量 

分 类 号：TE254.3[石油与天然气工程—油气井工程]