METHOD TO TRANSFER INFORMATION FROM WELL ALONG ELECTROMAGNETIC COMMUNICATION CHANNEL AND DEVICE FOR ITS REALISATION Russian patent published in 2013 - IPC E21B47/12 G01V3/30 

FIELD: electricity.

SUBSTANCE: method to transfer information from a well consists in the following: using a surface generator, electrical current is excited in a string of metal pipes, which generates electromagnetic field spreading in the rock of the well, which reaches the bottomhole area and creates the difference of potentials between the metal string and its isolated part. Receipt of information from the bottomhole is carried out depending on modulation of the voltage value required for stabilisation of the surface generator DC. The surface generator is a source of a stabilised DC. Besides, the surface generator is connected with one clamp to a surface part of the pipe string, and by the other one - to a grounded electrode that is remote from the well head. At the same time for transfer of information from the bottomhole the lower and upper parts of the string are closed or opened, changing the efficient value of conductivity between the grounding electrode of the current source and the metal string. When the key is closed, the specified efficient conductivity increases, and voltage on the current source clamps reduces and is recorded by a recording unit. By variation of the measured voltage the parameters of the drilled bed are decided.

EFFECT: increased reliability of information transfer from a bottomhole and expansion of its application area.

2 cl, 1 dwg