US 11,788,405 B2
Downhole oil level detection device
Zhibin Tian, Hebei (CN); Zanqing Wei, Hebei (CN); Lin Huang, Hebei (CN); Xiaoqiang Du, Hebei (CN); Yongren Feng, Hebei (CN); Bin Gao, Hebei (CN); Peng Sun, Hebei (CN); Yong Jiang, Hebei (CN); Minglue Fan, Hebei (CN); and Shiwei Zong, Hebei (CN)
Assigned to China Oilfield Services Limited, Tianjin (CN)
Appl. No. 17/440,143
Filed by China Oilfield Services Limited, Tianjin (CN)
PCT Filed Feb. 14, 2020, PCT No. PCT/CN2020/075289
§ 371(c)(1), (2) Date Sep. 16, 2021,
PCT Pub. No. WO2021/056951, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 201910901478.4 (CN), filed on Sep. 23, 2019.
Prior Publication US 2022/0154573 A1, May 19, 2022
Int. Cl. E21B 47/047 (2012.01); E21B 33/12 (2006.01)
CPC E21B 47/047 (2020.05) [E21B 33/12 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A device for detecting a downhole oil level, comprising an installation housing and a balance cylinder installed on the installation housing;
wherein the balance cylinder comprises a cylinder body and a moving piston, a piston tension spring, a moving rod, a moving rod compression spring, a displacement sensor, a limiting structure and a clamping structure which are installed in the cylinder body;
one end of the piston tension spring is fixed at one end of the cylinder body, and the other end of the piston tension spring is connected with a first side of the moving piston, the first side of the moving piston is further connected with one end of the moving rod compression spring, the other end of the moving rod compression spring is connected with one end of the moving rod, and the other end of the moving rod is provided with the displacement sensor, the displacement sensor is configured to measure a displacement of the moving piston; and
the other end of the moving rod is provided with the limiting structure, the first side of the moving piston is connected with the clamping structure, and the moving piston is configured to drive the moving rod to move through a cooperation between the clamping structure, the limiting structure and the moving rod compression spring.