	US 12,235,194 B2
	Coring device
Zhibin Tian, Hebei (CN); Tao Lu, Hebei (CN); Lin Huang, Hebei (CN); Zanqing Wei, Hebei (CN); Tiemin Liu, Hebei (CN); Yongren Feng, Hebei (CN); Xiaodong Chu, Hebei (CN); and Yong Jiang, Hebei (CN)
Assigned to China Oilfield Services Limited, Tianjin (CN); and China National Offshore Oil Corporation, Beijing (CN)
Appl. No. 17/776,125
Filed by China Oilfield Services Limited, Tianjin (CN); and China National Offshore Oil Corporation, Beijing (CN)
PCT Filed Apr. 7, 2021, PCT No. PCT/CN2021/085835 § 371(c)(1), (2) Date May 11, 2022, PCT Pub. No. WO2022/021930, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 202010737790.7 (CN), filed on Jul. 28, 2020.
Prior Publication US 2022/0397491 A1, Dec. 15, 2022
Int. Cl. G01N 1/08 (2006.01)

CPC G01N 1/08 (2013.01)

17 Claims

1. A coring instrument, comprising an electronic sub, a support arm sub, a rotary sub, a hydraulic control sub, a mechanical sub and a core reserving drum sub which are connected in sequence,

wherein the mechanical sub is configured to complete operations of thrusting, coring, core-breaking and core length measurement; the core reserving drum sub is configured to reserve a taken core; the electronic sub is configured to communicate with a ground control system and identify an azimuth of a core taken downhole; the rotary sub is configured to rotate the mechanical sub to a specified azimuth for rotary coring; the hydraulic control sub is configured to provide power for the rotary sub and the mechanical sub; the support arm sub is configured to fix a downhole position of the coring instrument,

the rotary sub comprises a rotating shaft, a moving sleeve and a fixed shell, wherein the moving sleeve is sleeved outside the rotating shaft and is in threaded connection with the rotating shaft; the rotating shaft and the moving sleeve are arranged in the fixed shell, and two ends of the rotating shaft extend out of two ends of the fixed shell respectively, and the rotating shaft is axially limited in the fixed shell; an end face of the fixed shell close to the hydraulic control sub is provided with an oil inlet, and the hydraulic control sub is configured to inject hydraulic oil into the fixed shell through the oil inlet to push the moving sleeve to move axially, the moving sleeve drives the rotating shaft to rotate, and thus controls a rotation of the mechanical sub through the rotating shaft;

wherein the oil inlet comprises a first oil inlet and a second oil inlet located on two sides of the rotating shaft, the moving sleeve is dynamically sealed with the fixed shell, and a sealed first cavity and a sealed second cavity are formed on two sides of the moving sleeve, the first oil inlet communicates with the first cavity, and the second oil inlet communicates with the second cavity through a channel;

wherein a wire channel is provided in the rotating shaft;

wherein the support arm sub comprises a supporting and fixing arm, the supporting and fixing arm at the upper part of the coring instrument is unfolded, an upper part of the coring instrument is fixed, and then the rotary sub is rotated.