SYSTEM AND METHOD FOR MAKING DOWNHOLE MESAUREMENTS

摘要

A system and method for making downhole measurements utilize a neutron source (12) to create a marker (122) in an underground formation (2), a nuclear radiation detector (D, 124)) to detect gamma and/or other nuclear radiation emitted by the marker (122) and a downhole drilling progress monitoring unit (20) which generates real time information about incremental depth and/or associated Rate Of Penetration (ROP) of an automated or other drilling assembly (4) based on detection of the nuclear radiation and an axial distance L between the neutron source (120) and the nuclear radiation detector (D, 124) without requiring transmission of the real time incremental depth and/or ROP data to surface equipment via a complex wired or wireless data transmission system.

主权项

1. A system for making downhole measurements in an underground borehole, the system comprising:
a neutron source for transmitting a neutron pulse to activate a target substance in an underground formation surrounding the borehole; a nuclear radiation detector located at an axial distance L from the neutron source for detecting nuclear radiation emitted by the activated target substance; and a downhole drilling progress monitoring unit configured to calculate incremental depth of a drilling assembly in the borehole based on detection of the nuclear radiation and the axial distance L.