US 11,781,390 B2
Fidelity retaining type coring device for rock sample
Mingzhong Gao, Guangdong (CN); Heping Xie, Guangdong (CN); Ling Chen, Guangdong (CN); Jianbo Zhu, Guangdong (CN); Cunbao Li, Guangdong (CN); Zhiyi Liao, Guangdong (CN); Zhiqiang He, Guangdong (CN); Jun Guo, Guangdong (CN); and Cong Li, Guangdong (CN)
Assigned to SHENZHEN UNIVERSITY, Guangdong (CN)
Appl. No. 17/419,028
Filed by SHENZHEN UNIVERSITY, Guangdong (CN)
PCT Filed Mar. 15, 2019, PCT No. PCT/CN2019/078276
§ 371(c)(1), (2) Date Feb. 3, 2022,
PCT Pub. No. WO2020/133724, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 201811596457.8 (CN), filed on Dec. 26, 2018.
Prior Publication US 2022/0186576 A1, Jun. 16, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 25/10 (2006.01); E21B 10/02 (2006.01); E21B 10/60 (2006.01)
CPC E21B 25/10 (2013.01) [E21B 10/02 (2013.01); E21B 10/605 (2013.01); E21B 2200/05 (2020.05)] 10 Claims
OG exemplary drawing
 
1. A fidelity-retaining coring device, comprising:
a rock core drilling tool, a rock core sample storage barrel, and a rock core sample fidelity-retaining cabin,
wherein the rock core drilling tool comprises a coring drilling tool, a core catcher, and an inner core pipe,
wherein the coring drilling tool comprises an outer core pipe and a hollow drill bit, and the drill bit is connected to a lower end of the outer core pipe,
wherein the core catcher comprises an annular base and a plurality of claws, the annular base being coaxially mounted on an inner wall of the lower end of the inner core pipe, and the plurality of claws being uniformly arranged on the annular base, a lower end of each of the plurality of claws is connected with the annular base, and an upper end of each of the plurality of claws is closed inward, wherein a lower end of the inner core pipe extends to a bottom of the outer core pipe, and the inner core pipe is in clearance fit with the outer core pipe;
wherein the core sample storage barrel comprises a rock core barrel, a drilling machine outer cylinder, a flap valve, and a trigger mechanism,
wherein the flap valve comprises a valve seat and a sealing flap, the valve seat is coaxially mounted on an inner wall of the drilling machine outer cylinder, and one end of the sealing flap is movably connected to an outer sidewall of the upper end of the valve seat, and a top of the valve seat is provided with a valve port sealing surface matched with the sealing flap,
wherein the rock core sample fidelity-retaining cabin comprises an inner coring barrel, an outer coring barrel, and an energy accumulator,
wherein the outer coring barrel is sleeved on the inner coring barrel, an upper end of the inner coring barrel is in communication with a liquid nitrogen storage tank located in the outer coring barrel,
wherein the energy accumulator is in communication with the outer coring barrel, and the outer coring barrel is provided with a flap valve.