Testing for the presence of native hydrocarbons down a borehole

Details Testing for the presence of native hydrocarbons down a borehole Testing for the presence of native hydrocarbons down a borehole

1984-05-09

1986-09-02

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

With sampling

250253, 250301, 250254, G01V 500

Patent

active

046098216

ABSTRACT:
In order to provide a reliable test for the presence of native hydrocarbons down a borehole during drilling with an oil-base drilling mud, a sample of the rock cuttings brought up from the vicinity of the drill bit by the circulating mud flow is collected, the sample or a fluid prepared from the sample is then placed in a spectrometer and is excited with electromagnetic radiation of one or more wavelengths. The radiation absorbed and/or emitted by the excited sample or sample preparation is sensed, and a plot is produced of the excitation and/or emission wavelengths against intensity, or in certain circumstances of the emission wavelengths against the excitation wavelengths. It can then be determined from the characteristic profile so obtained whether the hydrocarbon content of the sample incorporates only the oil base of the drilling mud or a combination of this oil-base and native hydrocarbons.

REFERENCES:
patent: 2459512 (1944-11-01), Fash et al.
patent: 2591737 (1950-11-01), Souther
patent: 3205353 (1965-09-01), Bray
patent: 4031398 (1977-06-01), Callis et al.
Hemphill et al., "Lab Analy. and Airborne Det. of Mat. Stimul. to Luminesse by the Sun", J. of Lum., vol. 31/32, Part II, Dec.-84, p. 724.
Czembor, R., "Fluorescence Meas. Process for Det. Small Quant. of Oil in Lyes. . . ", JR 5/1975.

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