Development Of Fault Analysis And Diagnosis Software For Common CBM Production Equipment

This paper finished by fund of the sub-topics of major national oil and gas projects(No:2011ZX05062-004)and the national natural science fund(No:51174224).The continuous and stable production is a key technology in CBM exploitation,and the fault or adaptability mining equipment is an important factor.This paper established a detection way by analysis of the fault typical characteristic of commonly mining equipment,predicted the fault by Comparison of clustering,in order to predictability manage and maintain equipment,and reduced the time to check pump and repair pump in CBM wells,to finish the objective that prolong the free operation period and improve production capacity.This paper mainly research to pumping sucker rod pump systems and screw pump systems.Firstly,this paper researched that coal-bed methane mining technology of equipment requirements,commonly fault diagnosis development status of mining equipment,common faults and the characteristics of a typical feature of the proposed method,then find out the different and characteristic of the need of mining CBM wells and oil wells,summarizes their differences,such as their mining way or productions etc.It provides a theoretical base for fault diagnosis of mining equipment in CBM wells.Secondly,analyzed of the pump movement and dynamics,summarized its suspension point,the acceleration curve and mechanics characteristic,analyzed the relationship with reducer torque,motor drive current and suspension point indicator diagram.established the suspension point indicator diagram and main fault features of downhole equipment set of common failures and downhole equipment,summarized the corresponding indicator diagram fault features,explored the method to extract fault characteristic value,set up pumping sucker rod pump equipment common basic theory and method of fault diagnosis.Thirdly,this paper also established the mechanics model of the screw pump,came to the conclusion that the torque curve graph and axial force,and a common fault of screw pump,Established a screw pump fault set,fond out the corresponding torque screw pump failure and the rule of variation of axial force,compared the normal work of torque and axial force curve,established a way to diagnosis to common fault of screw pump in CBM.Finally,sing VB to design a software that can fault diagnosis of commonly mining equipment for CBM,it can analysis of the equipment mechanical model and fault diagnosis for pumping sucker rod pump system and screw pump system,then it can predictive to diagnosis the fault for commonly mining equipment for CBM,reduce well stop working which the reason for fault of mining equipment,extension of the non-failure operation time,improve the economic benefits of the development of CBM.