压力脉动对气体钻井钻杆振动特性的影响

Pressure Pulsation Effect on Vibration Characteristics of Drill Pipe for Gas Drilling

基于钻杆振动的现有研究情况,以及压力脉动对气体钻井钻杆振动的重要影响,本文提出考虑压力脉动的气体钻柱振动特性计算方法。首先根据气体钻井实际情况,分析其压力脉动特性;然后建立包含压力脉动的激振力计算方法,在此基础上,建立钻杆振动特性计算模型。根据建立的模型,结合算例参数,分析了气体钻井钻杆的振动特性,包括压力脉动、激振力、弯头角度、模态阶数、振动位移及速度等。并通过对比实验测试与算例计算的结果,验证了分析方法与计算模型的可靠性。研究结果表明:压力脉动对气体钻井钻杆振动具有重要影响,进行气体钻井钻杆振动特性研究,需要基于压力脉动计算模型,建立激振力求解方法,才能保证钻杆振动特性分析的准确性、可靠性。研究结论对于气体钻井钻杆失效机理、钻杆共振特性以及提高钻杆使用寿命具有参考意义。

For the current study on drill pipe vibration, and the important influence of pressure pulsation on gas drilling drill pipe, a vibration calculation method is presented of gas drilling drill pipe considering pressure pulsation. First, the pressure pulsation characteristics were analyzed according to the field situation of gas drilling. Then the exciting force＇s calculation method was established including pressure pulsation. Based on this, basis the vibration characteristics＇ analysis model of drill pipe was presenled. According to the analysis model and combined with numerical example＇s parameters, the vibration characteristics of gas drilling drill pipe were analyzed, including the pressure pulsation, exciting force, elbow angle, modal order, vibration displacement and velocity. By results comparison of the field test and example calculation, it validated the reliability of analysis method and calculation models. The results showed that： the pressure pulsation has significant impact on drill pipe＇s vibration of gas drilling. For the study on the vibration of drill pipe, the exciting force solution method was tablished based on the calculation model of pressure pulsation, then it could ensure the analysis accuracy and reliability of the drill pipe＇s vibration characteristics. The study results provide references for research of failure mechanism, resonance characteristics, and improving service life of drill pipe for Gas Drilling.