西南石油大学学报(自然科学版)

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Study on Fault Diagnosis Technology for Fluid End of Drilling Pump

Zhang Zhidong1,2*, Ai Zhijiu1, Zheng Wei3, Li Ben4, Zhong Gongxiang1   

  1. 1. School of mechatronic Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. CCDC Safty Environment Quality Survellance &Inspection Research Institute,Guanghan,Sichuan 618300,China
    3. Drilling Tool Company of CNPC Greatwall Drilling Company,Panjin,Liaoning 124000,China
    4. Equipment Department of CNPC Greatwall Drilling Company,Chaoyang,Beijing 100101,China
  • Online:2015-10-01 Published:2015-10-01

Abstract:

The fault diagnosis method of fluid end that combines the statistical indexes and neural network is proposed in this
paper based on the analysis of fault diagnosis methods for fluid end of mud pump and the features of structure and operating
condition of mud pump. Firstly,the following indexes of vibration signal are selected to illustrate the characteristic index:
effective value,variance,peak index,impulsion index,kurtosis value and margin index,etc. At the same time,vibration
testing signal is collected by using a dynamic data acquisition instrument and piezoelectric acceleration sensors and the average
index for vibration signal is caculated. In order to construct the BP neural network and set network parameters,the selected
characteristic indexes are normalized. As the training samples,then these indexes are put into the BP neural network for training,
after which the constructed BP neural network can entirely meet the set training precision requirement. The corresponding
diagnostic errors of different plungers in field are 0.007 7,0.017 9,0.017 7 and 0.021 6,which shows that the constructed BP
network can reach the demands of plunger fault diagnosis. Therefore,this method may accurately diagnose fault of fluid end
of mud pump,which can be applied to engineering practice.

Key words: mud pump, fluid end, statistical indexes, neural network, fault diagnosis

CLC Number: