Advanced Density Logging Tool

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A research program is proposed to develop a new and innovative type of borehole logging tool for measuring the bulk density of geological formations. This tool uses a linear induction accelerator (LIA) to generate an intense x- ray beam which is scattered from the formation. Detectors placed near the accelerator sense the scattered photons thereby providing a direct measure of density. LIA-base systems offer substantial advantages over other density logging tools. Because its intensity is 50X more than that for radioactive tools, the LIA facilitates higher sensitivity and/or logging speed while offering greater safety during handling and transport. Also, it will be more rugged, capable of higher operating temperatures (175oC), and 3X less expensive than other x-ray-type logging tool with the following parameters: (1) electron energy 1MeV; (2) beam current 50 uA; (3) diameter 10 cm and (4) cost $50,000. We propose to perform three tasks: (1) develop a LIA system design including the accelerator, its power system and an x-ray converter; (2) perform experiments to evaluate and select key LIA components and (3) develop a onceptual design for the x-ray detector system. Success in Phase I will provide a firm foundation for development of a laboratory prototype logging tool in Phase II.