SURVEYING METHOD OF HORIZONTAL WELL Russian patent published in 2010 - IPC E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: pipe string with perforated section on the end surface is arranged in horizontal part of the well. Bottom-hole instruments are arranged in perforated section, namely the instruments connected to logging cable. Bottom-hole instruments are lowered and moved along the pipe string by pushing of logging cable with instruments to the well or lifting it from the well. Pipe string and logging cable is chosen from condition of ratio of diametre of inner surface of pipes to diametre of outer surface of logging cable of not more than 1.82. Before the surveys are performed, well liquid is replaced with fresh water with addition of "МЛ-81Б" surface-active substance in quantity of 0.1-0.3 vol. % and process exposure is performed till the well temperature is recovered. Pipe string is equipped with starting clutches. Well stimulation is performed by pumping of nitrogen from the mouth to tube space using compression method. Parametres are measured by means of bottom-hole instruments and measurement results are processed.

EFFECT: increasing efficiency of surveys.