Theoretical calculation and application of axial deformation in fracturing pipestring

Factors affecting axial deformation of pipestring during fracturing have been analyzed. In light of dynamic changes of various factors in field operations, a model for theoretical calculation of axial deformation in fracturing pipestring has been built by using elastic and plastic mechanics and stacking of micro-elements. The newly-developed model was used in calculating the deformation in hydraulic staged fracturing of Well Chenping 15-2. The calculation results show the model can accurately locate downhole operation positions, calibrate strength of various downhole assemblies, and identify required telescopic compensation distance. The relevant research results may provide necessary guidelines for on-site operations.