Issued Patents 2017
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9631454 | Wellbore pressure control system and method for offshore well cementation stages | Baojiang Sun, Yingwen Ma, Yonghai Gao | 2017-04-25 |
| 9605499 | Subsea wellhead pressure indicating and automatic adjusting device for deep-water dual-gradient drilling | Baojiang Sun, Zhennan Zhang, Zhiyuan Wang, Ning Wang, Guomin Yan +1 more | 2017-03-28 |