井口控制装置用液气控制阀启闭特性研究

Open/Close Characteristics of Liquid-Gas Control Valve in Wellhead Control Device

防喷器使用液气控制阀控制系统动力泵的启停,稳定控制系统管汇压力。针对现场普遍存在管汇压力波动大的现象,通过数值建模,从气源压力、油压端口面积以及弹簧刚度3个方面进行研究,分析液气控制阀启闭特性,并进行试验验证。研究结果表明:气源压力对液气控制阀启闭特性影响较小,油压端口面积与启闭压差成线型反比关系,弹簧刚度与启闭压差呈二次曲线关系。试验证明:为实现稳定精准控制,弹簧刚度应设计在94~97.3 N/mm之间为宜;同时应合理增加液气控制阀油压端口面积。所得结论可为提升液气控制阀控制精度提供理论依据,保障管路系统的安全性和可靠性。

The liquid-gas control valve is used to control the start and stop of the power pump in the blowout preventer control system and stabilize the manifold pressure of the control system.Considering the phenomenon of large pressure fluctuation in manifold on site,numerical modeling was used to identify the open/close characteristics of liquid-gas control valve from three aspects(gas source pressure,oil pressure port area,and spring stiffness),and the test verification was conducted.The results show that the gas source pressure has a relatively small impact on the open/close characteristics of the liquid-gas control valve,the oil pressure port area has a linearly inverse relation with the open/close pressure difference,while the spring stiffness has a conic relation with the open/close pressure difference.It is verified that the spring stiffness should be designed between 94 and 97.3 N/mm,and the oil pressure port area of the liquid-gas control valve should be reasonably increased,in order to achieve stable and precise control.The conclusions provide a theoretical basis for improving the accuracy of liquid-gas control valve,thus ensuring the safety and reliability of the pipe system.