Determination of the Optimal Drilling Mode Based on the Durability of the Drill Bit

The paper proposes one of the ways to set up an optimal mode of drilling oil and gas boreholes. The existing methods of control of the penetration rate and drill bit state were analysed. It was shown that due to incomplete and often distorted information it is difficult to perform control of the drilling process based on the mathematical model of the drill bit penetration, the solution of which is time dependencies of the penetration rate.

Buffer plugging systems – advanced direction for natural zeolite application

Influence of flushing fluid on the quality of casing cementation of Romenska deposit group in Dniprovska-Donetska depression has been concidered. Comparative studies of technological characteristics of buffer plugging systems with micro silica additives DBM-1 and natural zeolits DBM-2 and influence of the mix on cements to microstructure formation were carried out. Operational experience and findings obtained by industrial application of buffer plugging systems of different composition during the process of bore holes building at Anastasivska deposit PAT “Ukrnafta” have been presented.