Downhole sensor tool for nuclear measurements

摘要

A downhole measurement apparatus includes a tool body supporting a logging tool. The logging tool includes a detector outsert coupled into and exposed through an exterior pocket of the tool body to position the outer surface of the outsert adjacent or in close proximity to the outer diameter of the tool body. A stabilizer or off-center stabilizer may be provided to further deflect the outsert portion of the logging tool toward an earth formation to increase detector proximity to the formation. The axial distance between the detector and a nuclear source can be calibrated using configurations of the nuclear source holder and the outsert. Retention mechanisms for the source holder and the outsert further enhance proximity and calibration.

主权项

1. A downhole measurement apparatus comprising:
a longitudinal body including a logging tool, the logging tool further comprising:
an outsert containing a detector, the outsert disposed in an outer pocket of the body and coupled therein; anda logging source axially spaced from the detector, wherein the axial space between the logging source and the detector is calibrated via a source holder coupled to the outsert to form a sensor package; and a stabilizer coupled to the body adjacent the logging tool to deflect the logging tool and the outsert toward an earth formation.