The Study On The Failure Of Pumping Tubing Andtubing Threads Detection Technology

The tubing screw thread damage is the main type of tubing invalidation and is the important factor to increase the cost of oil well operation. The article is living in order to research tubing thread parameters allowable fluctuation in a pump inspection cycle, with fatigue life curve of tubing material object, by finite element analysis finalization, finally, the standard to the tubing thread parameters differentiate- to-the-waste has been established.Field statistics data indicate that:φ62mm worn tubing thread deformation was the furthest grave, and we take it as the main research object. First, we draw curve fatigue life of fatigue life by tubing object protracted test, so confirm that tubing section stress and strain value of fatigue life attaining 107 circulation time. Secondly, we find out tubing section maximum stress value by finite element analysis software and take it as tolerance limit value of tubing thread stress and strain. Again, we adopt finite element analysis software, on this condition of tubing actual operating loading, analyses alternation regular of tubing thread stress and strain on different tubing thread parameter value, and find limit stress and strain corresponding tubing parameter value, confirm limit range value of tubing thread parameter change, so we have got the tubing thread parameters differentiate- to-the-waste target.Based on the above research, synthesized API standard, the differentiate-to -the-waste boundaries of both the tubing thread parameters and the thread figure have been established, and according as it , develop tubing male thread actino-electricity detector which be fit for tubing renovation factory and particular gauge which be fit for field detection. Field using indicate that: the differentiate-to -the-waste is completely suit for oil production demand, importantly contribute to economize operation expense.