Determination of formation properties in cased boreholes using full waveform acoustic logs

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6620882

Tubman, K M; Cheng, C H; Toksoz, M N

Wave propagation in bonded and unbonded cased boreholes is examined through the calculation of synthetic full waveform acoustic logs. The models consist of a central fluid borehole surrounded by a number of fluid and solid annuli. Waveforms calculated for a variety of formation and cement parameters demonstrate that the first arrivals observed on full waveform acoustic logs in well bonded cased holes are those of the formation and not the casing. Waves refracted along the casing are generally too small to be observed. The presence of the steel and cement can make the determination of formation velocities more difficult than in an open hole. The formation body wave arrivals are decreased substantially if the cement velocities are near or greater than the formation velocities.

• Research Organization: Earth Resources Lab., Dept. of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139
• OSTI ID: 6620882
• Report Number(s): CONF-8406110-
• 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
BUILDING MATERIALS
CEMENTING
CEMENTS
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
EXPLORATION
EXPLORATORY WELLS
GEOLOGIC DEPOSITS
GEOPHYSICS
MATERIALS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PERMEABILITY
PETROLEUM DEPOSITS
PIPES
POROSITY
RESERVOIR ROCK
RESOURCES
SONIC LOGGING
SOUND WAVES
WAVE FORMS
WELL CASINGS
WELL LOGGING
WELLS