AUTOMATIC DRILL COLUMN POSITION SENSING Russian patent published in 2010 - IPC E21B47/22 G01C19/00 

FIELD: oil and gas production.

SUBSTANCE: instrument for measuring curve of borehole is installed near bore bit, and readings of borehole position are recorded, when drill column is extracted upon completion of drilling. The instrument for measuring curve of borehole consists of an inertia module of deviation survey, electric power source and data recording facility. Also the inertia module of deviation survey is chosen from a group consisting of known industrially fabricated inertia modules of deviation survey on base of the best characteristics of resistance to vibration and impact. The instrument for measuring borehole curve is in a standby mode operation during boring and is switched on to provide data on borehole position, when the drill column is successively extracted from an actual trajectory of the borehole.

EFFECT: upgraded accuracy of deviation survey during boring with implementation of remote perforators due to on-line registration of actual position of borehole, drilled with drill column, and due to record of deviations from required positions of borehole.

6 cl, 4 dwg