Downhole device to detect differences in fluid density

Details Downhole device to detect differences in fluid density Downhole device to detect differences in fluid density

1981-04-13

1983-10-25

Howell, Janice A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250265, G01V 500

Patent

active

044121300

ABSTRACT:
Apparatus for use within a well for indicating the difference in densities between two well fluids. The apparatus is formed within a drill collar with a source of radiation removably disposed in a wall of the drill collar. At least two radiation detectors are located equidistant from the source of radiation with one detector adjacent an interior central bore through the drill collar and a second detector is adjacent the exterior of the drill collar. Two fluid sample chambers are spaced between the source of radiation and the detectors, respectively; one chamber for diverting fluid from the bore and the other chamber for diverting fluid from the annular space between the drill bore and the drill collar. Suitable circuitry is connected to the detectors for producing a differential signal substantially proportional to the difference in radiation received at the two detectors. The difference in the density between fluid passing through the drill collar and returning through the annular space is detected and indicated by the apparatus for early detection and prevention of blowouts, as well as, for use with measurement-while-drilling (MWD) systems.

REFERENCES:
patent: 2965753 (1960-12-01), Reynolds et al.
patent: 3123709 (1964-03-01), Caldwell et al.
patent: 3488629 (1970-01-01), Claycomb
patent: 3555504 (1971-01-01), Fields
patent: 3617746 (1971-11-01), Janssen et al.
patent: 3688115 (1972-08-01), Antkiw
patent: 3713089 (1973-01-01), Claycomb
patent: 4297575 (1981-10-01), Smith, Jr. et al.

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