DETERMINATION OF DISTANCE WITH MAGNETIC DEVICES AT DRILLING OF PARALLEL WELLS Russian patent published in 2011 - IPC E21B7/04 E21B47/22 G01V3/00 

FIELD: mining.

SUBSTANCE: method involves the following operations: direction and inclination angle is measured at least for one of bottom hole assemblies (BHA) in wells, formation of magnetic field is performed at least in one of BHA and magnetic field is measured in the other BHA. The method involves the operation of determining mutual geometrical arrangement of one BHA relative to the other BHA. The method involves the following additional operation: position of one BHA is determined relative to geological structure of the Earth or geometrical shape of the Earth. The method involves the following additional operation: automatic positioning of one well relative to the other well is performed so that their pre-set mutual geometrical location can be maintained.

EFFECT: increasing efficiency of the drilling process owing to shortening the time during which the drilling plants do not perform drilling, or owing to eliminating the necessity for availability of additional equipment that is used only for movement of the tools lowered into the well by means of a rope in cased well.

71 cl, 14 dwg