摘要
在探井任务结束后,必须把海上废弃套管从泥线以下4 m左右切割回收到地面,以清除泥线上的残留物。高压磨料射流切割系统属于目前较常用的海上废弃套管切割工具,但对该工具切割套管的完整性监测还未有成熟的方法,导致无法确定废弃套管的上提时间,这就造成了切割时间的延长和成本的增加。提出采用非接触式声发射的方法来检测套管切割信号,并采用谱峭度法来判断套管切割的完整性。在谱峭度法判别过程中,通过跟踪全频段中套管切割信号的快速谱峭度图,确定了峭度最大时的带通滤波器参数;对经过滤波的套管切割信号作ZOOM FFT运算,可得出套管在某一个角度是否被完全切透。某油田的室内外试验表明,该方法可实现360°范围内的废弃套管切割状态实时判断,提升了磨料切割的效率,降低了切割成本。所提出的方法适用于相关领域振动信号的检测与故障诊断。
To remove residues of the mud line,after completing the well exploration mission,it is necessary to cut the abandoned casing pipes 4 - meter below mud line and recover them to the ground. Currently, the high pressure abrasive jet cutting system is the commonly used cutting tool for abandoned casing pipe at sea, but still lacks of mature tool for monitoring the cutting integrity, which leads to waste cutting time and increase the cutting costs, and the lifting time of the abandoned casing pipe cannot be determined. A non - contact acoustic emission method and the spectral kurtosis method are proposed to detect casing pipe cutting signal, and to determine the cutting integrity. In the judging process of spectral kurtosis method, by tracking the fast speed spectral kurtosis diagram of the cutting signals in the whole frequency band, the parameters of the bandpass filter at maximum kurtosis are determined ; and the ZOOM FFT operation is made for the cutting signals filtered, thus whether casing pipe is completely cut or not in a certain angle can be judged. The indoor and outdoor experiments at a certain oilfield indicate that this method can realize the judgement of the cutting status of abandoned casing within the range of 360° in real time, and improve the efficiency of abrasive jet cutting and reduce the costs. The proposed method can also be applied in vibration signal detection and fault diagnosis in related field.
作者
贾惠芹
党博
JIA Huiqin DANG Bo(Key Laboratory of Education Ministry for Photoelectric Logging and Detecting of Oil and Gas,Xi’ an Shiyou University, Xi’ an 710065, China)
出处
《自动化仪表》
CAS
2017年第6期79-81,85,共4页
Process Automation Instrumentation
基金
陕西省工业科技攻关项目(2016GY-177)
关键词
海上平台
石油探井
套管
声发射
非接触式
完整性
监测
快速谱峭度图
Offshore platform
Oil exploration well
Casing pipe
Acoustic emission
Contactless
Integrity
Monitoring
Fast spectral kurtogram
