Force
analysis and calculation of workover string in the slanted and horizontal well are
the basis of designing and checking string strength, selecting tools and determining
operation parameters, which determine 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.
References
[1]
Sui, M.C., Meng, K.L. and Du, L. (1999) Analysis of Friction on Drill String in Horizontal Drilling. China Petroleum Machinery, 27, 5-8.
[2]
Dou, Y.H. and Zhang, F.X. (2007) Mechanical Analysis of Well Testing Down-Hole String in Deep Well with HTHP and Its Application. Drilling & Production Technology, 30, 17-20.
[3]
Song, X.H. and Du, H.Z. (2006) Study on Deep-Well Fracturing Strings. China Petroleum Machinery, 34, 72-74.
[4]
Liu, Z.G. (1994) Analysis on the Downhole Stress of Slip Supported Packer. Oil Drilling & Production Technology, 16, 53-59.
