Measurement of Residual Stress of Expandable Tubular with the Blind-Hole Method
In the operation with expandable tubular,uneven residual stress often occurs to impede the me-chanical properties(e.g.collapse resistance and corrosion resistance)of the tubular.In this paper,the blind-hole method was adopted to measure the axial and circumferential residual stresses on the external surface of the ex-pandable tubular after expansion.The overall distribution of residual stress was obtained from finite element simula-tion(FES)and then verified.The results show that the average circumferential and axial residual stresses within 2 mm to the outer wall of the expandable tubular are measured to be-352.5 MPa and-589.0 MPa,respectively,with the error of less than 10%relative to the FES values.The neutral surface of the circumferential residual stress appears at about 70%of the wall thickness towards the inner wall,and the neutral surface of the axial residual stress occurs at about 64%of the wall thickness towards the inner wall.When the expandable tubular is stored for days after expansion,the axial and circumferential residual stresses reduce by 18.7%and 12.8%,respectively.The study results provide a reference for the performance analysis of expandable tubular.
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