NEUTRON DOWNHOLE DEVICE FOR MEASUREMENT OF POROSITY WITH INCREASED ACCURACY AND REDUCED LITHOLOGICAL EFFECTS

摘要

FIELD: measurement equipment.;SUBSTANCE: neutron downhole device for determination of porosity includes a source of neutrons, a device of neutron control, a neutron detector and a circuit of data processing. The source of neutrons may emit neutrons into an underground bed, and the neutron control device determines count of neutrons proportionate to emitted neutrons. The neutron detector may determine the count of neutrons, which are scattered from the underground bed. The data processing circuit may determine porosity of the underground bed corrected by impact of environment on the basis of at least partially count of neutrons scattered from the underground bed normalised to the count of neutrons proportionate to neutrons emitted by the source of neutrons.;EFFECT: provision of possibility of neutron geophysical research of porosity with high accuracy and reduced lithological effects.;12 cl, 16 dwg