Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1982-02-04
1985-01-08
Howell, Janice A.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250254, G01V 512
Patent
active
044928653
ABSTRACT:
A system for detecting changes in drilling fluid density downhole during a drilling operation includes a radiation source and detector which are arranged in the outer wall of a drill string sub to measure the density of drilling fluids passing between the source and detector. Radiation counts detected downhole are transmitted to the surface by telemetry methods or recorded downhole, where such counts are analyzed to determine the occurrence of fluid influx into the drilling fluid from earth formations. Changes in the density of the mud downhole may indicate the influx of formation fluids into the borehole. Such changes in influx are determinative of formation parameters including surpressures which may lead to the encountering of gas kicks in the borehole. Gas kicks may potentially result in blowouts, which of course are to be avoided if possible. Hydrocarbon shows may also be indicative of producible formation fluids. The radiation source and detector in one embodiment of the system are arranged in the wall of the drill string sub to provide a direct in-line transmission of gamma rays through the drilling fluid.
REFERENCES:
patent: 3209323 (1965-09-01), Grossman
patent: 3688115 (1972-08-01), Antkiw
patent: 4034218 (1977-07-01), Turcotte
patent: 4297880 (1981-11-01), Berger
patent: 4392377 (1983-07-01), Rankin
patent: 4412130 (1983-10-01), Winters
T. J. Hirst, M. Perlow, Jr., A. F. Richards, B. S. Burton, and W. J. Van Sciver, "Improved in situ Gamma-Ray Transmission Densitometer for Marine Sediments", Ocean Engng., vol. 3, No. 1, (Jun. 1975), pp. 17-27.
Coope Daniel F.
Murphy Richard D.
Hannaher Constantine
Howell Janice A.
NL Industries Inc.
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