Aim To resolve the influence of pressure gradient, liquid hold-up and mixture density of the different flow model on the design and operation of gas-lift well in oil recovery.

目的解决深井气举采油过程中不同流动型态的压力梯度、持液率、混合物密度对气举井设计和运行影响的问题。

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The Characteristics of valve movement using fully variable hydraulic valve train is studied by measurement of valve lift and oil pressure of fully variable hydraulic valve train.

通过对全可变液压气门机构的气门升程和液压压力的试验测量，研究了全可变液压气门机构的气门运动特性。

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Test results show that the hydraulic valve actuation system can realize continuously variable valve lift and the early intake valve closing by changing the time of oil pressure release.

通过实验证明这种液压气门机构可通过改变泄油初始相位角实现进气门最大升程和进气迟闭角的连续可变。

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