Title:
HIGH-EFFICIENCY DRILLING SYSTEM AND METHOD BASED ON ROCK BREAKING BY MEANS OF DOWNHOLE ROTATION AND PERCUSSION STEPPING IN COMBINATION WITH UNLOADING
Document Type and Number:
WIPO Patent Application WO/2022/193373
Kind Code:
A1
Abstract:
A high-efficiency drilling system and drilling method based on rock breaking by means of downhole rotation and percussion stepping in combination with unloading. The system comprises a housing (1), a driving assembly (2), a universal coupling (3), a transmission shaft (4), a rotation and percussion assembly (5), and a drill bit (6); the transmission shaft is rotatably connected to the housing; the rotation and percussion assembly comprises a rotation transmission component used for transmitting rotary power to the drill bit, and a percussion component used for providing high-frequency axial percussion power to the drill bit; when the rotation transmission component rotates with the transmission shaft, the percussion component applies a high-frequency percussion force along the drilling axial direction to the rotation transmission component; an annular drill bit (601) is provided at an outer end of the drill bit body of the drill bit; a center drill bit (602) is slidably fitted on an inner ring end surface of the annular drill bit; an inwardly recessed cylindrical region (604) is formed between a head end of the annular drill bit and a head end of the center drill bit. By means of the overall structure setting, the system can achieve the functions of stepping rock breaking, downhole unloading, and rotation and percussion drilling simultaneously, thereby greatly improving rock breaking and drilling efficiency.
Inventors:
LIU YONGWANG (CN)
WEI SEN (CN)
GUAN ZHICHUAN (CN)
ZOU DEYONG (CN)
WEI SEN (CN)
GUAN ZHICHUAN (CN)
ZOU DEYONG (CN)
Application Number:
PCT/CN2021/084838
Publication Date:
September 22, 2022
Filing Date:
April 01, 2021
Export Citation:
Assignee:
UNIV CHINA PETROLEUM EAST CHINA (CN)
International Classes:
E21B4/16
Foreign References:
| CN104847259A | 2015-08-19 | |||
| CN109594927A | 2019-04-09 | |||
| CN111894463A | 2020-11-06 | |||
| CN103174380A | 2013-06-26 | |||
| CN207485361U | 2018-06-12 | |||
| CN106639866A | 2017-05-10 | |||
| CN204804696U | 2015-11-25 | |||
| US3743036A | 1973-07-03 |
Attorney, Agent or Firm:
QINGDAO ZHIDILINGCHUANG PATENT AGENCY CO., LTD (CN)
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