不同气体产量下水平井完井管柱振动机理的试验研究

为了分析水平井完井管柱的振动机理，研究不同气体产量对完井管柱振动的影响，开展了不同气体产量下完井管柱振动试验研究。应用应变片测试技术采集不同气体产量下完井管柱在水平和重力两个方向的振动应变数据，采用模态分析法处理试验数据，得出管柱振动响应。结果表明：在气井开启初期，由于水锤效应，管柱容易产生较大振动，随着进气量的稳定，管柱振动逐渐减弱；完井管柱弯曲段流速不均匀，其振动较大；由于作用于管柱水平方向和重力方向的力不同，管柱水平方向的振动比重力方向的振动剧烈；完井管柱的振动位移、振动频率和位移标准差均随着气体产量的增大而增大，但在试验工况下，其在不同产量下的模态阶次相同。因此，适当减少气井开关次数、减小造斜处的井斜角以及气体产量有利于减小完井管柱与套管之间的碰撞和磨损，增强管柱的安全性。研究结果可为生产实际中减弱完井管柱的振动提供参考。

Experimental study on the vibration mechanism of horizontal well completion pipe string under different gas production

In order to analyze the vibration mechanism of horizontal well completion pipe string and the influence of different gas production on the vibration of completion pipe string, the vibration test of completion pipe string under different gas production was carried out.The strain gauge test technique was used to collect the vibration strain data of the completion pipe string in horizontal and gravity directions under different gas production, and the modal analysis method was used to process the test data and obtain the pipe vibration response. The results showed that in the initial stage of gas well opening, the string was prone to make large vibration due to water hammer effect, and then the pipe vibration was gradually weakened with the steady intake of air. The flow velocity of the bending section of the completion string was not uniform and the vibration was relatively large. The force acting on the pipe in the horizontal direction and gravity direction was different, so the pipe vibration in the horizontal direction was more severe than the vibration in the gravity direction. The vibration displacement, vibration frequency and displacement standard deviation of the completion pipe string increased with the increase of gas production, however the modal order was the same under different production under the test conditions. Therefore, appropriately reducing the number of gas well opening and closing, the inclination angle of the curved portion and the gas production were beneficial to reduce the collision and wear between the completion pipe string and casing and enhance the safety of the string. The research results can provide reference for reducing the vibration of completion pipe string in production practice.