Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11060009 | Filtrate reducer for temperature-resistant calcium-resistant water-based drilling fluid used in oil and gas reservoir protection, drilling fluid, and uses thereof | Yuping Yang, Jingping Liu, Ying Wang, Yan Zhang, Yushuang Liu +3 more | 2021-07-13 |
| 11053424 | Temperature-resistant calcium-resistant water-based drilling fluid for oil and gas reservoir protection and use thereof | Yuping Yang, Jingping Liu, Min Chang, Jinhong Wang, Yan Zhang +1 more | 2021-07-06 |