Experimental Study on Force Acting on Diameter-Variable Gas Lift Plunger During Diameter Changing
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摘要:
为了满足海上气井复合管柱的变径结构要求，解决气井积液、延长气井生产寿命，设计了一种新型变径柱塞结构，分析了变径柱塞在扩径、碰撞缩径过程中的受力情况。模拟了柱塞排水采气工艺过程，开展了室内变径柱塞变径行为观测、举液量与进气压力测量、举液效率分析等试验。试验结果表明，变径柱塞可在变径管柱中顺利运行，扩径所需进气压力与举液量成正比，该变径密封结构具有良好的举液效率。研究结果可以为变径柱塞在海上气井的应用提供试验依据和理论参考。
Abstract:In order to meet the requirements of the diameter-variable structure of composite pipe strings in offshore gas wells, solve the problem of liquid accumulation in gas wells, and extend the production life of gas wells, a new diameter-variable plunger structure was designed. Force acting on the diameter-variable plunger during diameter enlargement and reduction caused by collision was analyzed. In addition, the plunger drainage and gas production process was simulated, and tests were carried out, such as laboratory diameter-changing behavior observation, measurement of liquid lifting capacity and intake pressure, and analysis of liquid lifting efficiency of the diameter-variable plunger. The research results show that the diameter-variable plunger can run smoothly in the diameter-variable pipe string, and the intake pressure required for diameter enlargement is proportional to the liquid lifting capacity. The diameter-variable sealing structure has excellent liquid lifting efficiency. The research results can provide an experimental basis and theoretical reference for the application of diameter-variable plungers in offshore gas wells.
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图 3 变径柱塞扩径受力分析
Figure 3. Force acting on diameter-variable plunger during diameter enlargement
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图 5 变径柱塞缩径受力分析
Figure 5. Force acting on diameter-variable plunger during diameter reduction
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图 7 变径柱塞变径状态对比
Figure 7. Comparison of diameter-changing status of diameter-variable plunger
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图 8 举液量与进气量的关系曲线
Figure 8. Relationship between liquid lifting capacity and air intake capacity
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