METHOD AND SYSTEM FOR CONSTRUCTION OF WELLBORE IN GROUND FORMATION Russian patent published in 1999 - IPC

FIELD: oil-producing industry; applicable in construction of wellbore in ground formation in selected direction with respect to neighboring wellbore formed in ground formation. SUBSTANCE: method includes installation of source of electromagnet radiation in the first of the wellbores in many points over its length. The source induces electromagnetic field which penetrates into the second of the wellbores. Means for measurement of electromagnetic field is installed at selected depth in the second wellbore and controlled, respectively. Determined on the basis of measurements of electromagnetic field are its components which includes at least two components in directions substantially normal relative to longitudinal axis of the first wellbore. Determined on the basis of at least two components is parameter of direction indicating the wellbore location with respect to neighboring wellbore. EFFECT: higher accuracy of measurement of direction of one wellbore relative to the other wellbore. 14 cl, 4 dwg