FIELD: soil or rock drilling; mining.
SUBSTANCE: invention relates to drilling and can be used in construction and construction of oil and gas wells, offshore wells and wells with large horizontal length. Drill string arrangement includes a bit, a drill string and a rotor-controlled system. In the part of the layout, where the zenith angle is greater than 60°, the drill string consists of light-alloy drill pipes (LDP), or of LDP in combination with steel drill pipes (SDP). In upper part of well shaft, where zenith angle is less than 60°, drilling string consists of SDP in combination with weighted drill pipes (WDP).
EFFECT: such arrangement leads to increase of well flow rate, quality of cleaning of well bottom, efficiency of drill cuttings removal and makes it possible to perform drilling operations on horizontal sections of large length with possibility of drilling from floating and stationary facilities, minimizing risks of string sticking and excluding "sliding" drilling mode.
1 cl, 1 dwg
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