FIELD: oil and gas industry.
SUBSTANCE: drilling string bottomhole assembly comprising a drilling bit and a reamer axially displaced in the direction of the drillingl bit, the first sensor sub located in close proximity to the drilling bit with the ability to control the bit load, the second sensor sub located in close proximity to the reamer with the ability to control the reamer load, a data transmission block having a communication connection with the first and the second sensor subs and configured to receive and process the bit and the reamer load data, and one or more controlled nozzle located in each of the said drilling bits and reamer, and each controlled nozzle has a communication connection with the data transmission block and is actuated by this data transmission block to adjust hydraulic power supply to the drilling bit or the reamer when the ratio between the bit load and the reamer load exceeds the predetermined threshold work.
EFFECT: increased drilling efficiency.
19 cl, 4 dwg
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