GROUPING OF DRILLING COLUMN FOR DRILLING SIDE SHAFTS AND METHOD OF ITS MOUNTING DURING LOWERING INTO THE WELL Russian patent published in 2004 - IPC

FIELD: well drilling technology.

SUBSTANCE: grouping has sleeveless long-dimensional flexible pipe, pit-face engine with deflector, chisel, locking pipes connected to each other by means of thread. Sleeveless long-dimensional flexible pipe is placed in lower portion of drilling column between locking pipes and pit-face engine and has length, at least, no less then planned length of side shaft. Mounting method during lowering of drilling column for boring side shafts into the well includes lowering into the well and interconnection of pit-face engine with deflector and chisel, sleeveless long-dimensional flexible pipe and locking pipes, interconnected by means of thread. During lowering of sleeveless long-dimensional flexible pipe into the well it is placed between pit-face engine with deflector and locking pipes and is fully reeled off of drum. During passing of upper end of sleeveless long-dimensional flexible pipe along technological way between drum and mouth well, it is tensioned by means of flexible traction link. After lowering of sleeveless long-dimensional flexible pipe flexible traction link is dismounted and further connection of drilling column is performed by locking pipes with use of mast and tackle system.

EFFECT: higher precision of driving of maintenance side shafts.

2 cl, 3 dwg