Mechanical Calculation for Workover String in Highly-Deviated and Horizontal Well

Hu LIU, Xingyi LIU, Yanrui YOU


Force analysis and calculation of workover string in the highly-deviated and horizontal well is the basis of designing and checking string strength, selecting tools and determining operation parameters, which determines the operation safety and success of engineering accidence treatment. In this paper, by comprehensive consideration of wellbore structure, string assembly, string load and workover operation conditions, the workover string mechanical model has been built under three kinds of working states of lifting, lowering and rotating. The downhole string mechanics has been analyzed and calculated. By field verification, the string assembly, tool selection and operation parameter optimization can be achieved, which can improve the safety and success rates of workover engineering accident treatment.


Workover job; Horizontal well; String mechanics; Mechanical model; Accident treatment

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