China Oilfield Services, Limited

China National Offshore Oil Corporation

Xiaoqiang Du

Yongren Feng

Zhibin Tian

Lin Huang

Zanqing Wei

Yong Jiang

Tiemin Liu

Xiaodong Chu

Tao Lu

Bin Gao

Liping Liu

Shiwei Zong

Peng Sun

Minglue Fan

A hydraulic power system for a downhole device, including a first motor, a first hydraulic pump, a second hydraulic pump, a first main oil circuit, a second main oil circuit, a switching control module and a first execution module. The first motor has a first output shaft which drives the first hydraulic pump and has an oil outlet connected to an input end of the first main oil circuit and a second output shaft which drives the second hydraulic pump and has an oil outlet connected to an input end of the second main oil circuit; the first execution module is connected to an output end of the first main oil circuit; displacement of the first hydraulic pump is smaller than that of the second hydraulic pump; and the switching control module is connected between the first main oil circuit and the second main oil circuit.

Hydraulic power system for downhole device and downhole device

A downhole oil level detection device includes a mounting housing () and a balance cylinder () installed on the mounting housing (). The balance cylinder () includes a cylinder body () and a moving piston (), a piston tension spring (), a moving rod (), a moving rod compression spring () and a displacement sensor () installed in the cylinder body (). One end of the piston tension spring () is fixed to one end of the cylinder body (), the other end thereof is connected to one side of the moving piston (); one side of the moving piston () is also connected to one end of the moving rod compression spring (), the other end of the moving rod compression spring () is connected to one end of the moving rod (), the other end of the moving rod () is provided with the displacement sensor ().

Downhole oil level detection device

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Hebei, China

Xiaoqiang Du