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- W2999207421 abstract "Perforation will damage the cement sheath around the hole in petroleum engineering, leading to the failure of cement sealing integrity during hydraulic fracturing. This work presents a perforating experiment in real size to investigate the damage mechanism of cement sheath. The crack characteristics inside the cement after perforation were statistically analyzed by computerized tomography (CT). Then, a numerical model was introduced to describe the effective stress state in cement sheath during perforation based on ANSYS/LS-DYNA software. The damage zone around the hole in cement sheath was partitioned by the peak stress of cement during perforation. The results show that damage zone was formed by the surface pressure around the hole after the shaped jet passed through the cement. The toothed micro-cracks around the tapered hole are close to the cement/formation interface. The cement with lower shear modulus and higher strength can reduce the damage range in cement sheath, and the scheme with lower perforation density and larger perforated phase is more effective to the maintenance of cement sealing integrity during later fracturing process." @default.
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- W2999207421 date "2020-05-01" @default.
- W2999207421 modified "2023-10-14" @default.
- W2999207421 title "Mechanical response and damage mechanism of cement sheath during perforation in oil and gas well" @default.
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- W2999207421 doi "https://doi.org/10.1016/j.petrol.2020.106924" @default.
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