Design of Loss Preventive Materials With Help of Geomechanics Modelling

Abstract

During drilling different layers with different lithology and mechanical properties where the drilling process encounters many wellbore instability problems specifically in weak formations which required different mud weight and rheological properties to be used, the easier method is to separate between this layers by using casing, but by this way drilling will end up using many casings in single wellbore which in turn appears to be not economic solutions, which lead to search for an efficient and economic solution for that problems and the Loss prevention materials (LPM) are considered one of the best ways to protect weak formations due to their economic quality compared to other methods , and to apply the LPM should know the wellbore instability problems, by application of geomecanical Earth model that used to give the mechanical properties (rock strength, horizontal stress , wellbore instability analysis ) that used as effective tool to know and detect all the risks that can be faced, which helps to determine the suitable mud weight without cause a problems for any zone, to provide the data that required for create a Loss prevention materials Design to protect the weak formation by determined the (Fracture width and particle size distribution) to select the loss preventive materials(LPM) concentration for each weak zone to protect it and avoid the damage by the economic way .