System for simultaneous gamma-gamma formation density logging while drilling

Patent · Tue Oct 06 04:00:00 EDT 1987

OSTI ID:5922995

Paske, W C

A gamma radiation formation density logging apparatus is described for use in a borehole traversing an earth formation, comprising: an elongated sonde having a longitudinal axis; a source of gamma radiation located within the sonde; a gamma radiation detection assembly within the sonde, including gamma radiation detectors. At least two of the detectors are sensitive to gamma rays resulting from Compton scattering. The two detectors are spaced the same distance in the same longitudinal direction from the radiation source along the sonde and also are located symmetrically about the longitudinal axis of the sonde; means connected to each of the at least two gamma radiation detectors for producing first output signals from each of the at least two detectors; means to provide an indication of the density of the fluid in the borehole; and means responsive to the first output signals from the detectors and to the indication of the borehole fluid density for producing an additional output signal proportional to the density of the formation surrounding the borehole in the region of the sonde.

• Assignee: NL Industries, Inc., New York, NY
• Patent Number(s): US 4698501
• OSTI ID: 5922995
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
BASIC INTERACTIONS
BOREHOLES
CAVITIES
COMPTON EFFECT
DENSITY
DESIGN
DETECTION
DRILLING
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
EQUIPMENT
EXPLORATION
FLUIDS
GAMMA DETECTION
GAMMA SOURCES
GAMMA-GAMMA LOGGING
GEOLOGIC DEPOSITS
INTERACTIONS
MEASURING INSTRUMENTS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
PROBES
RADIATION DETECTION
RADIATION DETECTORS
RADIATION SOURCES
RADIOACTIVITY LOGGING
RESERVOIR FLUIDS
RESERVOIR ROCK
RESOURCES
SCATTERING
SIGNALS
WELL DRILLING
WELL LOGGING
WELL LOGGING EQUIPMENT