WELL SURVEYING METHOD Russian patent published in 2014 - IPC E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: well is equipped with a flow string and packer, the packer is set between two strata at 3 m and below from the bottom in the upper perforated interval. The well is shut down in order to align temperature field, records of gamma-ray and temperature log are made for the flow string to register a curve of background temperature distribution along the whole length of the well. Active water volume is pumped through the flow string to the lower stratum; simultaneously the metre intended to measure water flow rate in annular space is shifted from the length of packer seat to the distance of at least 50 m above the roof of the upper stratum with registration of reading of the thermometer and a flow meter. The repeated record is made for the well temperature survey and curve of background temperature distribution along the whole length of the well is registered; data are analysed and conclusion is made about technical status of the well.

EFFECT: improving authenticity of upward crossflows behind the production casing and vertical fluid movement in behind-the-casing space in wells with two and more perforated strata.

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