G - Physics – 01 – V
Patent
G - Physics
01
V
358/4
G01V 5/10 (2006.01)
Patent
CA 1251289
18C/7581PA/DR3/314 ATTORNEY DOCKET NO. WPC-lll COLLIMATED THERMAL NEUTRON POROSITY TOOL Abstract of the Disclosure For use in measuring thermal neutron activity in an open or cased hole, the preferred and illustrated embodiment of the present apparatus sets forth a porosity tool. The device incorporates one or more thermal neutron detectors in a sonde having a pressure housing adapted to be lowered into a borehole. The thermal neutron detector(s) is decentralized by placing it adjacent to one side of the pressure housing, and a decentralizer spring is placed on the exterior of the housing opposite the detector; this locates the detector much closer to the formation and reduces the intervening borehole fluid and the impact of borehole geometry on the data so obtained. Moreover, the decentralized detector is protected on the side of the detector away from the formation by placing a shield reducing the thermal neutron flux from that direction toward the detectors. In the preferred embodiment, the shield is cadmium and forms an approximate semi-cylinder about the detector.
487782
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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