Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11976554 | Bottom-hole impact-rotation stepping combined unloading rock-breaking efficient drilling system and method thereof | Yongwang Liu, Sen-Jung Wei, Deyong Zou | 2024-05-07 |
| 11255127 | Drill bit with joint function of induced unloading and abrasive jet and drilling method thereof | Yongwang Liu | 2022-02-22 |
| 10927607 | Drilling speed increasing device driven by downhole motor for generating shock vibration | Hualin Liao, Can Yi, Jilei NIU, Zhonghai Zhou, Yucai Shi +1 more | 2021-02-23 |
| 10815743 | Depressuriz od for downhole annulus drilling fluid | Yongwang Liu, Yucai Shi, Hualin Liao, Ben Guan | 2020-10-27 |
| 10801282 | Screw drill bypass valve with large displacement diversion function | Yucai Shi, Zhibin Fan, Yongwang Liu, Weixing YANG, Zhixiang Teng +2 more | 2020-10-13 |
| 10718176 | Drilling speed improvement device capable of producing both hydraulic pulse and impact vibration | Hualin Liao, Jilei NIU, Yandong Yang, Yucai Shi, Yongwang Liu +1 more | 2020-07-21 |
| 10233695 | Weight-on-bit self-adjusting drill bit | Yongwang Liu, Huaigang Hu, Ben Guan, Yucai Shi, Hualin Liao | 2019-03-19 |
| 9540881 | Method and system for improving drilling speed by using drill speed vibration | Yongwang Liu, Wenzhong Wei, Ben Guan, Yucai Shi, Hongning Zhang | 2017-01-10 |