Sand production is a complex physical process depends on mechanical properties of rock and soil factors of flow in the seams. There are many studies apply Local model-based forecasting only Mechanical pressure is the time start born of sand due to the complexity of the calculations and line elements not yet forecast the volume of sand was born. Today there are many models of hydraulic-Mechanical Place has been forecasting the volume of sand was born however every model has every experimental parameters are based on core samples to determine the test result accuracy was not able to apply the same parameters for many different seams Yet, the comparison of the model results with each other.
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