Acoustic--nuclear permeability logging system
A down hole logging tool featuring a neutron generator, an acoustic disturbance generator, and a radiation detection system is described. An array of acoustic magnetostriction transducers is arranged about the target of a neutron accelerator. Two gamma ray sensors are separated from the accelerator target by shielding. According to the method of the invention, the underground fluid at the level of a formation is bombarded by neutrons which react with oxygen in the fluid to produce unstable nitrogen 16 particles according to the reaction /sup 16/O(n,p)/sup 16/N. Acoustic pulses are communicated to the fluid, and are incident on the boundary of the borehole at the formation. The resulting net flow of fluid across the boundary is determined from radiation detection measurements of the decaying /sup 16/N particles in the fluid. A measure of the permeability of the formation is obtained from the determination of net fluid flow across the boundary.
- Assignee:
- Texaco Inc.
- Patent Number(s):
- US 4102185
- Application Number:
- TRN: 79-005667
- OSTI ID:
- 6371508
- Resource Relation:
- Patent File Date: Filed date 9 Dec 1976
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
03 NATURAL GAS
GEOLOGIC FORMATIONS
PERMEABILITY
NEUTRON-GAMMA LOGGING
DESIGN
OPERATION
BOREHOLES
FAST NEUTRONS
GAMMA RADIATION
MEV RANGE 10-100
NEUTRON SOURCES
NITROGEN 16
RADIATION DETECTORS
TRANSDUCERS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAVITIES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
MEV RANGE
NEUTRON LOGGING
NEUTRONS
NITROGEN ISOTOPES
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
PARTICLE SOURCES
RADIATION SOURCES
RADIATIONS
RADIOACTIVITY LOGGING
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
WELL LOGGING
440300* - Miscellaneous Instruments- (-1989)
020200 - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration