柱塞气举作为一种经济、有效的排水采气工艺技术,在气井排采中应用广泛。目前柱塞气举排水采气井工作制度调整通常依靠现场经验进行,调整难度大、效率低。针对上述问题，在对不同工作制度下气井产气量、产液量和柱塞运动速度分析的基础上,根据柱塞运行特征将柱塞上升过程分为三个阶段,并从柱塞基本运动方程出发,研究每个阶段柱塞运动方程的求解方法,编制了柱塞气举排水采气动态模拟软件系统。通过实例分析,柱塞气举排水采气动态模拟软件系统能有效模拟柱塞气举排水采气井在不同工作制度下的生产动态,为确定合理的工作制度提供了依据。通过对某试井现场应用,取得了平均产气量由16 323 m3/d提高到18 724 m3/d、平均排液量由1.73 m3/d提高到1.87 m3/d的增产效果。研究结果为柱塞气举在现场运用提供更可靠的理论基础。

As an economical and effective technology, plunger gas lift is widely applied in drainage gas production. At present, the adjustment of working system of plunger gas lift drainage gas production wells usually depends on field experience, which is difficult and inefficient. Based on the analysis of gas production, liquid production and plunger movement speed under different working conditions, the rising process of the plunger is divided into three stages in accordance with the its operating characteristics. Based on the basic motion equation of the plunger, the solution method of the motion equation of the plunger in each stage is studied and the dynamic simulation software system of the plunger gas lift drainage gas production is developed as well. Through case study, the system can effectively simulate the production performance of plunger gas lift drainage gas well under different working conditions and provide a basis for determining a rational working system. Finally, field application of a well test shows that the average gas production is increased from 16 323 m3/d to 18 724 m3/d and the average drainage is increased from 1.73 m3/d to 1.87 m3/d, which provides reliable theoretical basis for the field application of plunger gas lift.