METHOD OF REGULATION OF WELL DRILLING PROCESS CONDITIONS AND BOTTOM-HOLE ASSEMBLY FOR ITS IMPLEMENTATION Russian patent published in 2015 - IPC E21B44/00 

FIELD: oil-and-gas industry.

SUBSTANCE: method includes the drilling rate algorithm according to which the following technological parameters of drilling process - bit rpm, bit load, flow rate of flushing liquid - are raised to the powers determined by the mathematical expressions based on the generalised parameters characterising the bit interaction with rock: time of interaction of bit cutting structure with rock; mechanical and hydraulic capacities spent at bottomhole; bottomhole differential pressure. The bit is represented by a three-channel converter of mechanical and hydraulic capacities into the deepening. The bit rpm channel and the bit load channel together perform the first stage of process of deepening - bottomhole rock destruction by the mechanical power, and the channel of the flushing liquid flow rate perform the second stage of deepening - bottomhole cleaning from the destroyed rock by hydraulic power. Both stages are performed in a single interaction, that in turn is a source of the channel feedback and of interchannel interconnections pre-determining a basis of regulation of drilling process conditions.

EFFECT: decrease of dependence of the operating mode of a bottomhole hydraulic engine from bottomhole conditions and therefore its stabilisation.

6 cl, 2 dwg