METHOD FOR DRILLING OF PROCESS EQUIPMENT ELEMENTS IN WELL Russian patent published in 2019 - IPC E21B37/00 E21B7/00 E21B29/00 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used in drilling, development, repair and operation of well, drilling of elements of process equipment in well, in particular, rigging of horizontal and inclined well. Method includes screwing at the well head of tubing string completely or partially from steel drill pipes with upset locks and/or partially from drilling pipes with inwards upset ends, with screw downhole motor and with drill bit at the end, lowering of tubing string into well, pumping process liquid through the pipe string and rotation of screw downhole motor and drilling element, simultaneous rotation of pipe string in direction of rotation of screw downhole motor and drilling element, movement of pipe string along well and lifting of pipe string. Rotation of the pipe string is started after reaching the working load on the drill-out element, the initial rotation of the pipe string is assigned within range of 12–15 rpm and is maintained within range of 12–40 rpm, at increase of load on drill-up element, pipe string is lifted, reaching working load without interrupting pumping of process fluid and rotation of pipe string, lifting and lowering pipe string. Weight of pipe string is marked at lifting and lowering, at large difference of weights conclusion is made on sticking of column. To free from sticking, flushing speed is increased and/or column rotation speed is increased and/or column is pumped back and forth.

EFFECT: preventing and eliminating clamping and jamming of pipe string at drilling of elements of process equipment in well.

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