排序方式: 共有41条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
表面活性剂在水基压裂液中的应用 总被引:1,自引:0,他引:1
针对水基压裂液的特点与使用要求,分析了表面活性剂在水基压裂液中的作用机理,研究了1227杀菌剂、HY-605助排剂、SP169破乳剂、阴离子与非离子复合粘土稳定剂、消泡剂与起泡剂的应用效果以及与压裂液的配伍性。通过表面活性剂的作用,可有效地提高瓜胶水溶液的放置稳定性、压裂液的防乳、破乳、液体返排、稳定地层粘土、起泡与消泡能力以及保护地层、降低污染的效果。应用加有复合表面活性剂体系的有机硼交联压裂液于2001年在现场进行了3井次压裂施工,取得了液体返排率为85.9%,累计增油1670 t和天然气535.6×104 m3的良好效果。 相似文献
5.
6.
7.
Matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) is a rather new ‘soft ionization’ techniques. Because of its high sensitivity and accuracy, it has been widely used in detection and characterization of macromolecules such as peptides, proteins and olignucleotides. It also has been applied successfully in the analysis of posttranslational modification of proteins, such as phosphorylation and glycosylation. Compared with the conventional chemical methods, mass spectrometry is simple, rapid and does not require radiolabeling. In this research, a systematic method to analyse glycoprotein by MALDI-TOF-MS was developed. A practical sample--recombinant human erythropoietin was analysed by the method. The molecular weight, content of carbohydrate and glycosylation sites of the glycoprotein were determined by MALDI-TOF-MS, combined with the endo-glycosidase digestion and peptide mapping. The experimental result shows that MALDI-TOF-MS is a very powerful technique in the characterization of glycosylation proteins. 相似文献
8.
9.
10.