首页|高压管汇中活动弯管BC直接头失效分析

高压管汇中活动弯管BC直接头失效分析

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高压管汇作为压裂设备核心部件之一,比泵头体、泵阀等易损件失效危害更大.为此,以失效活动弯管BC直接头为研究对象,采用硬度检测、金相检验、扫描电镜检测等手段分析了失效直接头材料力学性能和断口形貌,并利用有限元方法计算了直接头轴肩根部含初始缺陷处的应力强度.分析结果表明:BC直接头失效是由应力集中导致的脆性断裂而产生;应力集中、组装配合不当使其受力不均、材料硬度偏高和力学性能不达标,由此造成接头在循环载荷作用下发生脆性断裂;建议严格控制接头原材料复检及产品质量检验,规范产品结构组装标准,定量规范管汇安装标准.所得结论可为压裂高压管汇接头的失效分析提供理论参考.
Failure Analysis of BC Straight Sub for Movable Bend in High-Pressure Manifold
As one of the important components of fracturing equipment,high-pressure manifold may fail to in-duce greater harm than such vulnerable parts as pump heads and valves.Taking the failed BC straight sub for mov-able bend as an example,the means such as hardness detection,metallographic examination and SEM detection were used to analyze the mechanical properties of material and fracture morphology of the straight sub,and the fi-nite element method was used to calculate the stress intensity at root of the straight sub shaft shoulder containing ini-tial defect.The analysis results show that the failure of BC straight sub is caused by brittle fracture resulted from stress concentration.Stress concentration,uneven force distribution due to improper assembly and fitting,high hardness and substandard mechanical properties of material all cause the sub to suffer from brittle fracture under the action of cyclic load.It is proposed to strictly control the recheck of raw materials of sub and product quality in-spection,standardize product structure assembly standards and quantitatively standardize manifold installation standards.The conclusions provide theoretical reference for the failure analysis of sub of high-pressure fracturing manifold.

BC straight sub for movable bendfailure causetest detectionfracture morphologyfinite el-ement analysisbrittle fracture

黄艳娟、周思柱、李美求、李宁、王兆坤

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长江大学

活动弯管BC直接头 失效原因 试验检测 断口形貌 有限元分析 脆性断裂

国家科技重大专项课题联合任务中国石油科技创新基金资助项目江苏省油(气)井设备工程技术研究中心开放课题

2016ZX05038-001-LH0022020D-5007-0503HT202102

2024

10.16082/j.cnki.issn.1001-4578.2024.02.017

石油机械
中国石油天然气集团公司装备制造分公司 中国石油学会石油工程专业委员会 江汉机械研究所 江汉石油管理局

石油机械

CSTPCD北大核心
影响因子：0.737
ISSN：1001-4578
年,卷(期)：2024.52(2)
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