闸板防喷器壳体侧门超声相控阵检测技术

Ultrasonic Phased Array Inspection Technology for Side Door of Ram BOP Shell

闸板防喷器作为井控关键设备,其侧门密封部位一直是薄弱环节,在高压冲击及循环载荷下局部区域将出现应力集中,进而产生疲劳裂纹。为了在不拆卸闸板防喷器的情况下有效检测出侧门密封部位的裂纹缺陷,采用ABAQUS有限元分析了2FZ35-70双闸板防喷器壳体侧门方腔部位承压情况下的应力分布,发现应力主要集中于侧门方腔矩形角部位。针对应力集中部位,首先采用超声相控阵仿真模拟区分了结构回波与缺陷回波,对缺陷进行了定性与定量分析;然后对含有人工模拟缺陷的试块进行实际检测试验,在上述仿真分析的基础上可准确快速地判断缺陷回波与结构回波。研究结果表明,实际检测结果与仿真分析结果基本相符,超声相控阵检测仿真模拟对现场实际检测具有指导意义,可为现场检测提供参考数据,进一步提高现场检测的效率。

Ram BOP is the key equipment of well control and the sealing part of its side door has always been a weak point.Under high pressure impact and cyclic load,stress concentration occurs locally,producing fatigue cracks.In order to effectively detect the crack defects at the sealing part of side door without disassembling the ram BOP,the ABAQUS finite element method was used to analyze the stress distribution in the square chamber of the side door of 2FZ35-70 double-ram BOP shell under pressure,indicating that the stress is mainly concentrated at the rectangular corner of the square chamber of the side door.Firstly,the stress concentration area was simulated by using ultrasonic phased array to distinguish the structural echoes from detect echoes and analyze the defects qualitatively and quantitatively.Then,the test pieces with artificially simulated defects were detected.Based on the simulation analysis,the defect echoes and structural echoes were distinguished quickly and accurately.It is found that the detection results are basically consistent with the simulation analysis results.The ultrasonic phased array inspection simulation provides guidance and reference data for on-site inspection,which further improves the inspection efficiency.