Acoustic paramagnetic logging tool
- (Bothell, WA)
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.
- Research Organization:
- ParaMagnetic Logging, Inc. (Bothell, WA)
- DOE Contract Number:
- FG06-84ER13294
- Assignee:
- ParaMagnetic Logging, Inc. (Bothell, WA)
- Patent Number(s):
- US 4724385
- OSTI ID:
- 866495
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
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