Method and apparatus for obtaining high resolution subsurface ge

Details Method and apparatus for obtaining high resolution subsurface ge Method and apparatus for obtaining high resolution subsurface ge

1982-11-12

1986-02-04

Moskowitz, Nelson

Communications: electrical

Wellbore telemetering or control

Selective control of subsurface equipment

340861, 340857, 364422, G01V 140

Patent

active

045689326

ABSTRACT:
A subsurface geophysical parameter measurement is converted downhole to a first pulse train whose instantaneous frequency is a function of the parameter value. In response to a first control signal, a first counter begins a first count of pulses from the first pulse train, and a second counter begins a count of second pulses from a downhole reference oscillator. The first and second counts are terminated in response to a second control signal and the first and second counters are interrogated. A ratio is then developed between the first and second counts which is functionally related to the value of the parameter.

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patent: 3977245 (1976-08-01), Clerk et al.
patent: 3991611 (1976-12-01), Marshall, III
patent: 4040002 (1977-08-01), Durand
patent: 4355310 (1982-10-01), Belaigues et al.
A/DVISOR, National Semiconductor, vol. 2, No. 1, Apr., 1981, pp. 1-6.
Technical Memo, Quartz Pressure Gauge System, Model 2811B; Hewlett-Packard, Section I, pp. 1-1, 1-2, 1-4; Section III, pp. 3-1, 3-5, and 3-8; Section IV, pp. 4-1, 4-3; Section V, p. 5-24; Section IV, p. 6-3.

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