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Analysis the Failure of Sucker Rods and Research on Its Residual Life

Author: HaoLiLi
Tutor: LiGuoYi
School: Daqing Petroleum Institute
Course: Engineering Mechanics
Keywords: Failure Analysis Remaining life Fatigue fracture Fracture Toughness Ultrasonic testing
CLC: TE933.2
Type: Master's thesis
Year: 2008
Downloads: 197
Quote: 1
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Abstract


Sucker rods as one of the key components in the exploitation of oil and gas fields , which directly determines the quality of the production efficiency . Most of the sucker rod failure under alternating load off off its failure analysis and proposed remaining life prediction method can effectively improve the use efficiency of the sucker rod . Little theoretical research sucker rod remaining life can be directly applied to the scene , it is difficult to direct by engineering testing means to determine the remaining life of the sucker rod . In this paper, through the 20GrMo Steel Grade D sucker rod fatigue test to identify the variation of the crack front , draw crack depth and the remaining life of the relationship , to borrow a mathematical model of the Paris formula established by ultrasonic testing testing the relationship between the signal and the depth of the crack , i.e. , the relationship between the crack detection signal and the remaining lifetime , which made the use of ultrasonic flaw detection signal directly determine the sucker rod remaining lifetime methods. The remaining life on research results and fatigue simulation test compared life prediction in line with the rate of more than 72% . This paper : ( 1 ) from the field study of the history of wells wells start statistics rod wells fault phenomena , analysis of sucker rod failure types and failure factors , to identify the main factors of the sucker rod cracks - fatigue fracture ; the fatigue fracture crack of 20CrMo steel grade D sucker rod material three-point bending experimental studies to identify the parameters of fracture toughness , the propagation rate of fatigue crack defects probability distribution . Studies have shown that the probability distribution of the the 20CrMo steel D grade rod fracture toughness and mechanical properties of the materials are subject to normal distribution , and draw the the 20CrMo steel Grade D sucker rod crack growth rate of material performance constant C , m ; . using immersion ultrasonic instrument to monitor the fatigue fracture test methods to predict the remaining life of the 20CrMo steel grade D sucker rod , to establish the relationship between the ultrasonic signal and sucker rod crack depth , in order to establish a sucker rod by ultrasonic testing signal discrimination the remaining life of the simplified method .

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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Oil and gas production machinery and equipment > Pumping mechanical equipment > Sucker rod
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