Casing tensile stress distribution in the bending section of a well during hydraulic fracturing

• DOI: 10.1007/s13202-023-01609-2
• Publication Date: 2023-01-31T11:07:37Z
• Authors: Zhao Yang; Rui Sun; Zhaoyi Liu
• Keywords: Internal pressure

Abstract During hydraulic fracturing, there has been little research on casing tensile stress distribution from the tilting area to horizontal in whole string. In order study bending sections during a three-dimensional finite element mechanical analysis model of casing–cement–formation was established. The showed that: When cement missing, decreased with situ difference increasing, and increased when middle or target missing. internal pressure continuously, first then increased, 20 MPa, which minimum point. lower than Poisson’s ratio increasing. higher Compared case where temperature ignored, below 5 ℃ had influence stress; however, above significant stress. Fracturing formation Young’s modulus elasticity rock 15 GPa could reduce failure tensile. results certain guiding significance for prevention sections.