Calculation Model of Drilling Tool Passing Through Buckled Casing in Ultradeep Wells
The downhole loading conditions in ultra-deep reservoir are increasingly severe,so the capacity of drilling tool passing through three-dimensionally buckled casing was studied.By comparing the geometric relation-ships among drilling tool,casing and wellbore size,and considering the relevant parameters of buckled casing,the maximum length by which drilling tool passes through sinusoidally and spirally buckled casing was determined.A calculation model of drilling tool passing through buckled casing was built and used for example calculation.The casing buckling form in the case was determined using the finite element method,and then the passing capacity in different buckling forms was calculated.The results indicate that the drill pipe and drill collar can freely pass through the buckled casing,and the passing capacity of the drilling tool is mainly affected by the bit size.Finally,the pass-ing capacity of the bit in the buckled casing was verified through full-scale entity test.The calculation model estab-lished can also be used for determining the passing capacity of other downhole tools,such as tubing in buckled cas-ing,and downhole tool in buckled tubing,and it is of great guiding significance for on-site operation of oilfields.
casing bucklingsinusoidally buckledspirally buckledpassing capacitydrilling tooldownhole toolUltradeep well
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万方数据
维普
