The principal aim of this paper is to apply MATLAB/SIMHYDRAULICS Toolbox to produce a new model of drilling mud circuit in order to provide practical solutions of drilling program problems. We have studied the work of the mud circuit during drilling and we made a model of the process using Matlab/Simulink, then we obtain accurate results for the first time on a similar system. After we have created the numerical model, we run the simulation process to know how much the effectiveness of it in the real time. We used for this purpose the bentonite mud for the choice of fluid. The results proved the effectiveness of the model in order to start using it on the ground.

The principal aim of this paper is to apply reliability study at drilling tools in order to find the best way to combat fatigue and wear and optimization of drilling parameters. Wherefore, we have use Weibull law then we compare the obtained results Through the use of special software. The numerical results show that reliability is wealth of information which explains much of the problem such as: fatigue, wear and wear assessment, for this we propose to continue the application of reliability for all drilling equipment and also we discovered that we could improve setting parameters and mechanical parameters for any drilling tools using reliability analysis.