Neutron well logging technique for gas detection

Details Neutron well logging technique for gas detection Neutron well logging technique for gas detection

1976-03-29

1977-09-06

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, 250269, G01V 500

Patent

active

040470270

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a technique is disclosed for determining a characteristic of an earth formation by irradiating the formation with a source of neutrons and measuring the resulting neutron population at two different spacings from the source. Each neutron population measurement is converted into a signal which is related to the formation porosity corrected for environmental effects. The two converted signals are then compared with the porosity derived from the ratio of the two neutron population measurements in order to obtain an indication of the presence of gas in the formation.

REFERENCES:
patent: 3701902 (1972-10-01), Janssen et al.
patent: 3789219 (1974-01-01), Wilson
patent: 3833809 (1974-09-01), Beil
patent: 3842265 (1974-10-01), Pitts, Jr.

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