Geo- mechanical model sensitivity to effective slope and azimuth parameters to maintain well wall integrity (Case study of Poisson and Young s modulus coefficients in one of southwest Iran reservoirs)

In the past, reservoir studies have generally been related to mines and this field has been widely used. Due to the advantages of these wells over vertical wells, it is important to have a comprehensive insight into the optimal drilling of such wells. One of the most important parameters for optimal drilling operations is maintaining the stability and integrity of these wells. Therefore, it is important to study the various geomechanical, reservoir and operational parameters affecting the wall stability of these wells. In this research, numerical simulation of two-dimensional finite element method is performed after geomechanical modeling of well formation, reservoir and rock mechanics.Then the effect of different geomechanical parameters (such as Yang coefficient, Poisson coefficient, which will be compared), slope and azimuth of the well on its stability is studied. Then the optimum value of each of these parameters is determined for having a successful drilling operation. In this research, we have tried to find the best and safest drilling path as well as a safe mud window by calculating the geomechanical models and examining the changes of each of the slope and test parameters and their impact on the stresses on the rock mass. In addition to checking the sensitivity of the above parameters, the safety valve of the mud can also be examined in detail. In this paper, the sensitivity and effectiveness of physical factors and parameters of rock mechanics including Young s modulus, Poisson s coefficient of variation and use are investigated. Phase 2 software and obtaining 2D shapes from the well wall observed the amount of damage during drilling to select the most optimal and least harmful path during drilling.

Keywords:

Geomechanical modulus , Elastic modulus of reservoir rock , Rock mechanics , Inductive induced stresses , Stress regime , Well wall stability