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Title: Acoustic paramagnetic logging tool

Abstract

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological 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 nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth3 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 andmore » to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores.« less

Inventors:
 [1]
  1. (Bothell, WA)
Publication Date:
Research Org.:
ParaMagnetic Logging, Inc. (Bothell, WA)
OSTI Identifier:
866495
Patent Number(s):
US 4724385
Assignee:
ParaMagnetic Logging, Inc. (Bothell, WA) RLO
DOE Contract Number:  
FG06-84ER13294
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
acoustic; paramagnetic; logging; tool; methods; apparatus; disclosed; allow; measurement; presence; oil; water; geological; formations; physical; effect; called; aple; petroleum; formation; causes; slight; increase; earth; magnetic; field; vicinity; reservoir; phenomena; paramagnetism; application; source; larmor; frequency; nucleons; disappear; results; decrease; earth3; bearing; repetitively; sweeping; approx; khz; amplitude; modulation; consequence; measured; induction; coil; gradiometer; provides; direct; measure; amount; excitation; zone; phase; signal; infer; longitudinal; relaxation; times; fluids; ability; separate; viscosity; measurements; preformed; boreholes; cased; bores; acoustic source; oil bearing; paramagnetic logging; acoustic paramagnetic; induction coil; geological formations; magnetic field; logging tool; amplitude modulation; geological formation; relaxation times; bearing formation; direct measure; allow measurement; frequency sweeping; rate oil; relaxation time; physical effect; effect called; logging effect; /324/

Citation Formats

Vail, III, William B. Acoustic paramagnetic logging tool. United States: N. p., 1988. Web.
Vail, III, William B. Acoustic paramagnetic logging tool. United States.
Vail, III, William B. Fri . "Acoustic paramagnetic logging tool". United States. https://www.osti.gov/servlets/purl/866495.
@article{osti_866495,
title = {Acoustic paramagnetic logging tool},
author = {Vail, III, William B.},
abstractNote = {New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological 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 nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth3 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

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