Dual excitation acoustic paramagnetic logging tool

Details Dual excitation acoustic paramagnetic logging tool Dual excitation acoustic paramagnetic logging tool

1988-02-08

1989-02-14

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324307, 324300, G01R 3320

Patent

active

048049182

ABSTRACT:
New methods and apparatus are disclosed which allow measurement of the presence of oil and water in gelogical formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleous present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described.

REFERENCES:
patent: 4438400 (1984-03-01), Patt
patent: 4528508 (1985-07-01), Vail, III
patent: 4689565 (1987-08-01), Kemner
patent: 4724385 (1988-02-01), Vail, III
patent: 4737712 (1988-04-01), Stormont

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