Issued Patents 2020
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10865337 | Multi-functional weighting agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof | Yang Bai, Pingya Luo, Yan Cheng, Guancheng Jiang | 2020-12-15 |
| 10858571 | High-temperature retarder suitable for oil and gas well cementation, preparation method thereof and cementing slurry | Chengwen Wang, Yucheng Xue, Wei Zhou, Ruihe Wang, Yong Li +1 more | 2020-12-08 |
| 10533122 | Strong plugging drilling fluid composition and preparation method thereof, and use thereof | Yang Bai, Cheng Li, Guojun Li, Yan Cheng, Hao Zhang +2 more | 2020-01-14 |