COMPLEX SPECTROMETRIC EQUIPMENT FOR NEUTRON LOGGING Russian patent published in 2018 - IPC G01V5/10 

FIELD: measurement technology; mining.

SUBSTANCE: using for diagnosis of near-well zones of reservoirs. Summary of Invention is that neutron logging equipment comprises common source of neutrons installed in a protective casing along its axis, two gamma-radiation detectors for radiative capture of thermal neutrons of a spectrometric neutron gamma-ray logging (SNGL), two thermal neutron detectors that form small and large neutron-neutron logging for thermal neutrons (NNLt), and additionally contains two detectors of epithermal neutrons, forming small and large probes of neutron-neutron logging for epithermal neutrons (NNLet), SNGL detectors are separated from each other by a lead shield and placed in a common cadmium converter screen, while NNLt probe detectors are placed in cadmium screens and separated from NNLet probe detectors by polyamide screens, and the gaps between screens are impregnated with a high-temperature silicone sealant, with all the SNGL, NNLt and NNLet probes located on one side of the neutron source.

EFFECT: extending the functionality of neutron methods, which allow to investigate the near-wellbore zone of the reservoir with increased reliability on the fluid composition of hydrocarbons and content of formation waters in the pore space of the reservoir and their distribution in the radial direction from the borehole wall (col).

5 cl, 1 dwg