FIELD: mining.
SUBSTANCE: flow restriction tool can include a locking mechanism having positions in which the flow is passed through the tool, wherein in one position, the flow channel is open for flow, and the locking mechanism blocks the flow through the other flow channel, and in the other position both channels are open for flow, and a shifting unit which moves the locking mechanism to the previous position in response to decrease in flow rate below the predetermined level. The drilling tool can include an orientation tool which periodically passes the flow through the wall of the drilling tool for transmitting orientation data by means of pressure pulses in the flow section through the string, and flow restriction tool that passes the flow through one flow section if the flow rate is below the predetermined level, and passes the flow through larger flow section if the flow rate is increased.
EFFECT: increased efficiency of drilling tool orientation in the well.
20 cl, 3 dwg
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