Systems, apparatus and methods for measuring while drilling

Details Systems, apparatus and methods for measuring while drilling Systems, apparatus and methods for measuring while drilling

1982-06-17

1985-11-12

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 85, 340853, 175 40, G01V 140

Patent

active

045532265

ABSTRACT:
This invention is concerned with downhole measurements while drilling a borehole in the earth with a drill bit at the lower end of the drill string and transmitting such measurements to the surface. The drilling fluid is forced through a fluid passage which includes a drill string, a bit at the lower end thereof and the annulus surrounding the drill string. There is a restriction in the passage causing a pressure drop creating a high pressure zone and a low pressure zone within said passage, and a drilling fluid bypass comprising a bypass valve provides fluid communication between the high pressure zone and the low pressure zone. By means of a downhole sensor and associated equipment a plurality of pulse or electrical voltage change signals representing downhole information is produced. Each of these signals is arranged to generate several electrical voltage changes. A control means is provided to cause opening of the bypass valve responsive to one of these signals and for causing closing of the valve responsive to another of said signals.

REFERENCES:
patent: 2380520 (1945-07-01), Hassler
patent: 2925251 (1960-02-01), Arps
patent: 3711825 (1973-01-01), Claycomb
patent: 3736558 (1973-05-01), Cubberly, Jr.

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