Plungerlift is a most efficient substituted technique to successive gas lift production. The key of the technique is control to the motion of plunger.
它是连续气举采油最有效的接替技术，技术的关键是对柱塞运动的控制。
2
Based on the mass and momentum conservations of fluid, the mathematical model of Two-Piece plungerlift and single-string pig lift which unload by pressing fluid level down is derived.
基于流体质量、动量守恒导出了单管球塞气举和分体式柱塞气举采用“压低液面”卸载的数学模型；
3
This paper introduced the principle and composition of the system of automatic control plungerlift. The using limits of the technology were given and the performance model was explained emphatically.