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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.

In the field of drilling there is increasing interest in topics such as degradation of drilling tools and estimation of penetration speed, as well as efforts to optimize geometrical parameters and drilling processes. The current study was based on an original experimental setup that estimates the actual operating conditions of drilling tools and proposed mathematical models with and without interactions. These models characterize the penetration speed of a widely used compact polycrystalline diamond (PDC) oil-drilling bit. The special focus of this study was on the cutter penetration bit, with the aim of investigating the influence of four operating variables weight on bit (WOB), bit rotational speed (RPM), cutting angle , and compressive strength Cs on yield maximum penetration rate, using Taguchi's design-of-experiment concepts. In the study, 27 experimental runs based on Taguchi's L27 orthogonal array were performed with signal to-noise (S/N) ratio, analysis of variance (ANOVA), and regression analysis being used, with penetration rate as response variables. From the optimization and experimental analyses conducted, it was observed that WOB3 (160 kgf), RPM3 (152 rpm), 3 (45), and Cs1 (640 kgf/cm 2) had significant influence on penetration rate. The optimal values obtained during the study optimization using the Taguchi approach were validated by confirmation experiments.

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Abstract-The aim of presented research is to develop methods of determining the parameters of rational control of machine operation of percussion drilling during its operation in geological and mining conditions defined. To set the goal of empirical research, it is based on the literature search in which several researchers have studied the mode of percussion drilling with different methods based on the physic mechanical properties of the rock, setting parameters of the machine, geometric parameters of tool. The literature has shown us that there are now some methods of determining the dependencies of the drilling speed, and height of penetration is a function of the energy of a piston stroke and the drilling speed is a function of the height of penetration into the rock and the rotational speed, The analysis shows that these methods are based on knowledge of the peculiarities of the interaction of the tool against the rock. Each time, we take into account the parameters mentioned above. Keywords-Forces applied, properties of the rock, progress drilling, the height of penetration.

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.