Selection of the best combination of bit types and technological parameters during drilling, taking into account uncertainty

The article is devoted to the estimation of the required mud density during well drilling in fields with abnormally high reservoir pressures. The possibility of density calculation is shown on the basis of data on gradients of pore pressures and fracture pressures, as well as changes in rate of penetration with depth. Identification of the expression for estimating the mud density was applied to some deposits, distribution of pore pressures, fracture pressures and drilling mud density was constructed using the example of one of the deposits.