Issued Patents 2021
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11192964 | Ionic liquid shale inhibitor for drilling fluid and preparation method and application thereof | Lili Yang, Xiao-Feng Yang, Tengda WANG, Yawei Shi | 2021-12-07 |
| 11136488 | Biodiesel-based constant rheological property drilling fluid containing intelligent temperature responsive polymer | He Shi, Kaixiao Cui, Yinbo He, Lili Yang, Tengfei Dong +7 more | 2021-10-05 |
| 11034876 | Calcium-resistant zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing polymer as dispersant | Yinbo He, Tengfei Dong, Lili Yang, Wuquan Li, Haiyang Liu +6 more | 2021-06-15 |
| 10889742 | Modified polyhistidine suitable for being used as a supramolecular shale inhibitor, method of preparing the same and its application in water-based drilling fluids | Yinbo He, Lili Yang, Kai Wang, Tengfei Dong, Xiaohu Quan +2 more | 2021-01-12 |