西南石油大学学报(自然科学版)

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Probability Determination for Loss Circulation of Drilling Fluids Based on
Analytic Hierarchy Process

Kang Yili1, Wang Haitao1, You Lijun1, Du Chunchao2   

  1. 1. The State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Engineering,Southwest Petroleum University,Chengdu,Sichuan
    610500,China
    2. Northwest Company,SINOPEC,Urumqi,Xinjiang 830013,China
  • Online:2013-08-01 Published:2013-08-01

Abstract:

Lost circulation control is one of the technical problems which impose a negative effect on security,smooth,and
highly effective drilling. Geologic and engineering factors are of a major impact on mud loss. The geologic agent is an internal
cause and plays a decisive effect. As the premise and the foundation of loss control,it is necessary to grade probability of
the intervals with loss potentials. In view of the complexity and random characteristic of lost circulation zones,Analytical
Hierarchy Process(AHP)is introduced to analyze the structure of the factor system. By comparing the importance of isostrate
factors,constructing an easily quantified membership function,and by using the weighting synthesis,the final lost circulation
appraisal value has been obtained. Finally,this AHP assessment method is applied to two case wells in Tahe Oilfield. The
results indicated that probability evaluation of lost circulation zones by AHP method is feasible,and is helpful for loss control
design and technology optimization.

Key words: analytical hierarchy process, drilling fluid, lost circulation, probability, formation