Depth referencing system for a borehole gravimetry system

Details Depth referencing system for a borehole gravimetry system Depth referencing system for a borehole gravimetry system

1985-01-28

1986-06-24

Levy, Stewart J.

Measuring and testing

Borehole or drilling

Downhole test

73DIG4, E21B 4704

Patent

active

045961395

ABSTRACT:
A borehole gravimetry system employs a pair of pressure transducers for lowering into a borehole along with a borehole gravity meter. The pressure transducers are spaced apart vertically within a pressure sonde for producing a pressure differential measurement of the wellbore fluid. A first of the transducers is hydraulically isolated from borehole fluid pressure while the second of the transducers is in hydraulic contact with the borehole fluid so as to be exposed to the borehole fluid pressure. The second transducer is thermally insulated from borehole temperature to achieve thermal time constant equalization between the pair of transducers. A pressure differential measurement and a gravity reading is taken for each of a plurality of vertical locations within the borehole as the borehole gravimetry system is advanced through the borehole and from these measurements bulk density is determined.

REFERENCES:
patent: 3031591 (1962-04-01), Cary et al.
patent: 3978939 (1976-09-01), Trouiller
patent: 4399693 (1983-08-01), Gournay
patent: 4455875 (1984-06-01), Guimard et al.
patent: 4475386 (1984-10-01), Fitch et al.

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