Abstract
The current research on the stability of the formation - cement sheath - casing combination is mainly based on the plane modelling, with established 3D model as just an example. There are no systematic studies of the three-dimensional model under triaxial ground stress when the influence of physical parameters on stability of the composite cementing interfaces is evaluated. By establishing a three-dimensional formation - cement sheath - casing combination, it was shown that the two cementing interfaces are separated under the action of triaxial ground stress. The effects of physical properties (elastic modulus, Poisson’s ratio, and density) of the cement sheath on the contact pressure and spacing of the cemented interfaces are studied. According to the established theoretical model, the influence of different physical parameters on well integrity after cementing in Qinghai Oilfield was analyzed, which provided theoretical support and guidance for the occurrence of out-of-tube turbulent flow and instability mechanism, and the direction for subsequent construction operations such as profile control and water plugging are pointed out. The results show that the physical properties of the cement sheath are critical in ensuring long-term sealing of the combination.
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