用超声波检测信号预报抽油杆剩余寿命

PREDICT REMAINING LIFETIME OF PUMP ROD BY ULTRASONIC SIGNAL

石惠宁 姚红星 丁建东 孟宪红 王睿 陈金芳

Shi Huining Yao Hongxing Ding Jiandong Meng Xianhong Wang Rui Chen Jinfang

华北油田公司, 河北任丘 062552 中国科学院力学研究所, 北京 100080 北京航空航天大学固体力学研究所, 北京 100083 中国石油管道公司西气东输项目部, 北京 100724

目前研究抽油杆剩余寿命的理论方法没有一种可直接应用于现场,无法直接通过工程检测手段来判断抽油杆的剩余寿命。为此,通过抽油杆疲劳试验,找出裂纹前缘的变化规律,得出裂纹深度与裂纹面积之间的关系、裂纹面积与剩余寿命的关系,借用传统Paris公式的数学模型,通过超声波检测建立了超声波探伤信号与裂纹深度之间的关系式,即裂纹检测信号与裂纹扩展规律之间的关系,从而提出了直接利用超声波探伤信号确定抽油杆剩余寿命的方法。将研究结果与疲劳模拟试验得出的剩余寿命相比较,寿命预测符合率达84%以上。

No research theory of remaining lifetime of pump rod can be used to in-situ, and can not diagnose it remaining lifetime by engineering examine at present. From endurance testing of pump rod, fined change rules of leading edge of cracking, obtained relationship between depth and area of crack and relationship of crack area and remaining life, use Paris formula, established relation of ultrasonic inspection and crack depth, and relation of crack detection signal and crack spread law, proposed predict method of remaining lifetime of pump rod by ultrasonic inspection. Compared results of remaining lifetime by simulated test and theory predict, indicate it was coincide more than 84%.

10.3969/j.issn.1000-7393.2005.03.018