US 12,421,820 B2
Sealed coring device for underground coalbed
Sheng Xue, Huainan (CN); Lefan Wang, Huainan (CN); Xiaoliang Zheng, Huainan (CN); Ping Liu, Huainan (CN); Chen Shen, Huainan (CN); Gang Jin, Huainan (CN); Weibo Liu, Huainan (CN); Sihang Zhang, Huainan (CN); and Jingyi Zhou, Huainan (CN)
Assigned to ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY, Anhui (CN)
Appl. No. 18/548,370
Filed by ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY, Anhui (CN)
PCT Filed May 17, 2023, PCT No. PCT/CN2023/094831
§ 371(c)(1), (2) Date Aug. 30, 2023,
PCT Pub. No. WO2024/093198, PCT Pub. Date May 10, 2024.
Claims priority of application No. 202211357571.1 (CN), filed on Nov. 1, 2022.
Prior Publication US 2025/0012159 A1, Jan. 9, 2025
Int. Cl. E21B 25/10 (2006.01); G01N 1/08 (2006.01)
CPC E21B 25/10 (2013.01) [G01N 1/08 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A sealed coring device for an underground coalbed, comprising:
a rib drill pipe assembly comprising a rib drill pipe, a tail drill pipe joint and a head drill pipe joint; joint mounting bases configured for mounting the tail drill pipe joint and the head drill pipe joint are respectively arranged at two ends of the rib drill pipe;
a sampling cylinder assembly mounted in the rib drill pipe and comprising a center shaft, a tail cover plate, a tail sealing ring, a tail revolving door, a sampling cylinder, a head revolving door, a head sealing ring, a head cover plate and a back nut retainer ring, wherein a hollow shaft sleeve for mounting the center shaft is arranged in the sampling cylinder, a head sampling port is formed on a head end of the sampling cylinder, a tail sampling port is formed on a tail end of the sampling cylinder, and the tail cover plate, the tail revolving door, the head revolving door, the head cover plate and the back nut retainer ring are mounted on the center shaft;
a tail bearing pack mounted in the tail drill pipe joint and configured for protecting an internal structure from relatively rotating during drilling of the rib drill pipe, thus ensuring stability of the sampling cylinder; and
a motor cylinder assembly mounted in the rib drill pipe and configured for providing power for driving the center shaft in the sampling cylinder assembly.