	US 11,859,450 B2
	Drilling fluid channel structure of core drilling rig
Mingzhong Gao, Sichuan (CN); Heping Xie, Sichuan (CN); Ling Chen, Sichuan (CN); Jun Guo, Sichuan (CN); Zhilong Zhang, Sichuan (CN); Zetian Zhang, Sichuan (CN); Ru Zhang, Sichuan (CN); Yiqiang Lu, Sichuan (CN); Cong Li, Sichuan (CN); and Zhiqiang He, Sichuan (CN)
Assigned to SHENZHEN UNIVERSITY, Guangdong (CN); and SICHUAN UNIVERSITY, Sichuan (CN)
Appl. No. 17/309,235
Filed by SHENZHEN UNIVERSITY, Guangdong (CN); and SICHUAN UNIVERSITY, Sichuan (CN)
PCT Filed Nov. 12, 2018, PCT No. PCT/CN2018/114963 § 371(c)(1), (2) Date Mar. 11, 2022, PCT Pub. No. WO2020/093411, PCT Pub. Date May 14, 2020.
Claims priority of application No. 201811327013.4 (CN), filed on Nov. 8, 2018.
Prior Publication US 2022/0213736 A1, Jul. 7, 2022
Int. Cl. E21B 10/60 (2006.01); E21B 25/08 (2006.01); E21B 25/10 (2006.01)

CPC E21B 10/605 (2013.01) [E21B 25/08 (2013.01); E21B 25/10 (2013.01)]

9 Claims

1. A drilling fluid channel structure of a core drilling rig, comprising a fluid channel activation module, a pressure relief module, a flow diverging and blocking module, a driving fluid channel, and a cooling fluid channel,

wherein the fluid channel activation module, the pressure relief module, the flow diverging, and the blocking module are connected sequentially from a first end to a second end of the structure,

the driving fluid channel and the cooling fluid channel are connected at a rear side thereof to the flow diverging and blocking module,

wherein the driving fluid channel comprises a driving section and a driving fluid outlet, the driving section being disposed between a stator and a rotor of a driving motor, while the driving fluid outlet being disposed in front of the driving section, and

the cooling fluid channel extends through a layer disposed between an integrity-preserving compartment and an outer barrel, and

wherein a front end of the outer barrel is connected to a drill bit, and a front opening of the cooling fluid channel is located at the drill bit.