Formation density logging while drilling

Patent · Tue Nov 10 04:00:00 EST 1987

OSTI ID:5864813

Coope, D F

A rotating device is described for use in a borehole traversing an earth formation comprising: a gamma ray emitting means. The means emits a collimated gamma ray beam along a first trajectory. The beam intersects a first circle located in a sample of the formation to be measured. A first gamma ray detecting means is oriented to receive emitted gamma rays scattered from locations within the first circle. A means is provided for counting the received gamma rays during I preselected periods of time. Each period is equal and commencing each 360/sup 0//I of rotation, and wherein I is an integer which is at least three; and a means is also provided for determining a first product of the counts of gamma rays received by the first detecting means during the I time periods to provide an indication of the average density of the formation sample.

• Assignee: NL Industries, Inc., New York, NY
• Patent Number(s): US 4705944
• OSTI ID: 5864813
• 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
COUNTING TECHNIQUES
DENSITY
DESIGN
DETECTION
EQUIPMENT
EXPLORATION
GAMMA DETECTION
GAMMA SOURCES
GEOLOGIC DEPOSITS
MEASURING INSTRUMENTS
MINERAL RESOURCES
MWD SYSTEMS
NATURAL GAS DEPOSITS
OPERATION
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
RADIATION DETECTION
RADIATION DETECTORS
RADIATION SOURCES
RESOURCES
WELL LOGGING EQUIPMENT