COMPLEX SPECTROMETRIC EQUIPMENT FOR NEUTRON LOGGING Russian patent published in 2019 - IPC G01V5/10 

FIELD: oil and gas industry; geophysics; measuring technology.

SUBSTANCE: use for geophysical studies of oil and gas wells by nuclear logging methods. Essence of invention is that complex spectrometric equipment (CSE) of neutron logging is performed on the basis of a stationary neutron source. Device comprises neutron-neutron logs based by epithermal neutrons (NNLeth), the indications of which are more closely related to the density and hydrogen content of rocks and saturating fluids. CSE also comprises a spectrometric gamma radiation detector for radiation capture of thermal neutrons (SNGL) located on one axis of the probe on one side of a stationary source of neutron radiation in the following sequence from the center of the source: a small probe NNLeth, large probe NNLeth, a small probe SNGL, and which is protected by a lead shield from the concomitant gamma radiation of a neutron source and gamma radiation from neutron radiation capture from the chemical elements of the fluids filling the well. On the opposite side of the neutron source, along the axis of the device, neutron-neutron logs by thermal neutrons (NNLth) and a spectrometric gamma radiation detector for radiative capture of thermal neutrons (SNGL) of radiation in the following sequence from the center of the source: a small NNLth probe, a large probe NNLth, large probe SNGL, and which is protected by a lead shield from the concomitant gamma radiation of a neutron source and gamma radiation from neutron radiation capture from the chemical elements of the fluids filling the well, and is located at a greater distance from the neutron source than in the previous version, provided that the dimensions of both probes are more than 60 cm.

EFFECT: wider functional capabilities in geophysical studies of oil and gas wells.

6 cl, 1 dwg