METHOD FOR DATA TRANSFER FROM WELL VIA ELECTROMAGNETIC COMMUNICATION LINE AND DEVICE TO THIS END

摘要

FIELD: oil and gas industry.SUBSTANCE: group of inventions is related to the area of well drilling and intended for transfer of well data to the surface through an electromagnetic communication line. The method for transfer of well data through an electromagnetic communication line is suggested by means of current excitation in the formation surrounding the lower part of the drill string. At that current is excited in the formation by EMF of a free-running generator connected to the string and a coaxial ring isolated from the string. Besides, an additional coaxial ring isolated from the string is introduced to the upper assembly of the pipe string and collection of alternating voltage is done from this ring as induced in the formation close to the string surface by flowing current generated by the radiating ring. At that value of the above voltage is modulated by EMF of the free-running generator controlled in compliance with coded bottomhole data. The device for implementation of the above method is also claimed.EFFECT: improving reliability of data transfer from the bottomhole through the electromagnetic communication line, expansion of its scope of application and simplification of the device design for manufacture.2 cl, 2 dwg