MULTI-METHOD MULTI-PROBE NEUTRON LOGGING EQUIPMENT - MMNL FOR ROTATIONAL SCANNING OF SECTIONS OF OIL AND GAS WELLS Russian patent published in 2022 - IPC G01V5/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, to the field of nuclear physics methods for researching wells and can be used in devices that carry out diagnostics of the annular space in the rotational scanning mode. Proposed equipment for multi-method multi-probe neutron logging - MMNL for rotational scanning of oil and gas well sections, which includes a neutron source, a spectrometric neutron gamma ray logging (SNGRL) detector, thermal neutron detectors that form small and large probes of neutron-neutron logging by thermal neutrons (2NNLt), and epithermal neutron detectors forming small and large epithermal neutron neutron logging probes (2NNLtn). The detectors 2NNKnt and 2NNKt are made in the form of cassettes with neutron counters, each of which contains a central neutron counter and a neutron counter installed in the annular zone close to the perimeter of the inner wall of the instrument. All SNGRL, 2NNLt and 2NNLtn probes with screens are installed in an additional housing that can be forced to rotate around the longitudinal axis of the device inside a protective casing, while the additional housing is made of a material that is transparent for the passage of neutrons and is not subject to bending and torsion deformations.

EFFECT: expanding the functionality of neutron methods, which makes it possible to investigate the near-wellbore zone of the reservoir with increased reliability in terms of the fluid composition of hydrocarbons and the content of formation waters in the pore space of the reservoir and their distribution in the radial direction from the casing string wall of the well.

7 cl, 1 dwg