System for simultaneous gamma-gamma formation density...

Details System for simultaneous gamma-gamma formation density... System for simultaneous gamma-gamma formation density...

G - Physics

01

N

358/3

G01N 23/00 (2006.01) G01V 5/12 (2006.01)

Patent

CA 1257404

-39- SYSTEM FOR SIMULTANEOUS GAMMA-GAMMA FORMATION DENSITY LOGGING WHILE DRILLING ABSTRACT OF THE DISCLOSURE A system for logging subterranean formations for the determination of formation density by using gamma radiation. Gamma ray source and detection means are disposed within a housing adapted for positioning within a borehole for the emission and detection of gamma rays propagating through earth formations and borehole drilling fluid. The gamma ray detection means comprises first and second gamma radiation sensors geometrically disposed within the housing the same longitudinal distance from the gamma ray source and diametrically opposed in a common plane. A formation matrix density output signal is produced in proportion to the output signal from each of the gamma ray sensors and in conjunction with certain constants established by the geometrical configuration of the sensors relative to the gamma ray source and the bore- hole diameter. Formation density is determined without regard to the radial position of the logging probe within the borehole in a measuring while drilling mode.

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