A pressure control device and a pressure increase and decrease control method

Abstract

The invention provides a pressure control device and a pressure increasing and decreasing control method. The pressure control device comprises a power assembly, a transmission assembly and a pressureregulating valve connected in sequence, wherein under the condition that a bidirectional clutch in the transmission assembly is in a first transmission state, when the power assembly moves in the first direction, the bidirectional clutch is engaged to drive the pressure regulating valve to carry out pressurization action, and when the power assembly is reversely reset in the second direction, thebidirectional clutch is separated; under the condition that the bidirectional clutch is in a second transmission state, when the power assembly moves in the second direction, the bidirectional clutchis engaged to drive the pressure regulating valve to perform pressure reduction action, and when the power assembly is reversely reset in the first direction, the bidirectional clutch is separated. By the adoption of the bidirectional clutch, the process of increasing and reducing the pressure of a hydraulic system is realized, the structural assemblies are simplified, and the equipment utilization rate is high; and the pressure control device has the advantages that pressure regulating operation is simple and convenient, occupied mounting space is small, the structural cost is low and energyconsumption is low.

Description

technical field [0001] The invention relates to the field of pressure control equipment, and more specifically, to a pressure control device and a method for controlling cycle increase and decrease. Background technique [0002] For formation testing instruments, most of them use the hydraulic system to drive the executive components to complete the operation processes such as seat seal, sampling, coring, and pressure measurement. Precise control of pressure is critical to instrument reliability and timeliness. [0003] However, in the underground high temperature and high pressure environment, due to the decrease of fluid viscosity under high temperature and high pressure, and the influence of harsh working conditions, it is more difficult for the hydraulic system to achieve precise control through simple methods. The conventional high precision pressure control system is applied in the For downhole equipment, it is often limited by factors such as small installation space...

AI Technical Summary

Problems solved by technology

[0003] However, in the underground high temperature and high pressure environment, due to the decrease of fluid viscosity under high temperature and high pressure, and the influence of harsh working conditions, it is more difficult for the hydraulic system to achieve precise control through simple methods. The conventional high precision pressure control system is applied in the For downhole equipment, it is often limited by factors such as small installation space in the downhole, unfavorable power supply and oil supply, and inconvenient on-site operation, which makes it difficult to guarantee the control accuracy and working stability of the pressure control device of the hydraulic system.

Therefore, it is still a difficult problem in the industry to overcome the complexity of the pressure control of the downhole hydraulic system and develop a hydraulic system pressure control device with high regulation efficiency, high control accuracy, strong applicability and high stability.

Images