Because of its analytical nature, such an extension can easily be used in conjunction with logs in order to give a rather precise idea of the sand production risk on a newly drilled well.
The column represents the dimension started to converge when the size of the volumetric model in the.
A field case illustrates how the model can hence provide an understanding for observations which could have otherwise remained unexplained.įinally, by introducing special failure criteria calibrated on hollow cylinder and cavity failure tests, an extension of the model is compared favourably to some 3D non linear numerical simulations in the case of a second field case. element in FEA for the triangular simplified models. This pseudo 3D model, based on linear elasticity, confirms that sand production risk for a given perforation strongly depends on well deviation and on the orientation of the perforation in the plane orthogonal to the wellbore. In an attempt to make such an approach more flexible, this paper presents a simplified, semi quantitative analytical model able to evaluate sand production risks in cased holes with various deviations.
Such a problem is usually studied by using complex non linear 3D Finite Element Models. When comparing various wells on a given field in terms of sand production, it often happens that they display quite different behaviours: for example, deviated wells will produce sand whilst vertical ones won’t.Ī major reason behind such an apparent paradox is the orientation of the well and its perforations in the in-situ stress field.