Systems and methods for downhole logging with enhanced sensitivity and azimuthal resolution

• Main Authors: Feyzi Inanc, Marc Ramirez
• Format: Patent
• Language: English
• Published: 08.09.2021
• Subjects: DETECTING MASSES OR OBJECTS; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

A downhole logging tool (200) includes a radiation generation source (206) operable to emit radiation into a formation (218) surrounding the tool (200), a radiation detector (208) fixed relative to the radiation generation source (206) and operable to detect backscattered radiation from the formation (218) surrounding the tool (200), and a sleeve (214) positioned around the radiation detector (208) to shield the radiation detector (208) from a first portion of the backscattered radiation. The sleeve (204) includes at least one aperture (212) for exposing the radiation detector (208) onto a second portion of the backscattered radiation, in which the second portion of the backscattered radiation emanates from an inspected region of the formation (218) facing the at least one aperture (212). A signal measured at the radiation detector (208) corresponds to the inspected region of the formation (218), and the position of the at least one aperture (212) is changeable with respect to the formation (218) to distinctly inspect different regions (504a-l) of the formation (218).