Issued Patents 2020
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10815743 | Depressuriz od for downhole annulus drilling fluid | Yongwang Liu, Zhichuan Guan, Yucai Shi, Ben Guan | 2020-10-27 |
| 10718176 | Drilling speed improvement device capable of producing both hydraulic pulse and impact vibration | Jilei NIU, Zhichuan Guan, Yandong Yang, Yucai Shi, Yongwang Liu +1 more | 2020-07-21 |
| 10697277 | Simulation device and method for integrated evaluation experiment for sand control wellbore plugging and plugging removal | Lin Dong, Jilei NIU, Changyin Dong, Wenhao Ma, Shuai Yang +3 more | 2020-06-30 |