04-Evaluacion de Cemento
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Transcript of 04-Evaluacion de Cemento
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EVALUACIÓN DE CEMENTO
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Bond log showing cement top
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Typical Cement Bond
Log presentation
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Good Formation Bond
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Free pipe
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CBL-VDL in free pipe (no cement). Notice straight line and high amplitude pattern on
VDL pipe arrivals (railroad track pattern). Travel
Time curve is constant and amplitude curve reads
high. Note casing collar anomalies on travel time
and amplitude curves, and more weakly on VDL display.
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Casing is still unbonded (high amplitude
Railroad tracks on early arrivals on VDL), Railroad tracks on early arrivals on VDL),
Amplitude curve reads high, BUT late arrivals on VDL have “shape” and track
porosity log shape. This indicates free
pipe laying on side of borehole and
Touching formation. The VDL arrivals with “shape” are the Formation arrivals.
Better casing Centralization should be
used on the next well. A cement squeeze
will improve the scene but will probably
not provide isolation on the low side of
the pipe.
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Well bonded pipe (low amplitude on
early arrivals on VDL, good bond to formation (high amplitude late arrivals with “shape”). Mud arrivals
would have high amplitude but no “shape”.
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VDL on left shows poor bond but formation signal is fairly strong. When casing is put under pressure,
bond improves (not a whole lot) as seen on lower amplitude early arrivals on right hand log. This is
called a micro-annulus. Under normal oil production, the micro-annulus is not too big a problem unless
bottom hole pressure is very low. Micro-annulus is caused by dirty or coated pipe, pressuring casing
before cement is fully cured, or ridiculous pressures applied during stimulation.
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When there is no CBL-VDL made
under pressure, the un-pressured
version can be used to interpret
micro-annulus. High amplitude
early arrivals (normally
Indicating poor bond) actually
Indicate good bond (with
micro-annulus) IF formation
signals are also strong.
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The travel time curve is lower than baseline
(shaded areas, Track 1) indicating fast formation
arrivals. If you see fast formation, you have a
good bond to pipe and to formation. However,
you cannot use the amplitude curve (labeled
“Casing Bond” on this example) to calculate
attenuation, compressive strength, or bond
index, because the amplitude is measured on
the formation arrivals, not the pipe arrivals.
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• Centralización
• Pozos con gas
• Microanillo
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Tracks 8 to 16 provide 5 segmented curves from the impedance image broken into 9 segments around the wellbore. High activity indicates solids, and low activity indicates fluid. In the zone F notice how the curves have both low impedance and low activity compared to the data immediately above it in zone C.
Track 6 (DZ) is the variance of the impedance map which highlights the differences between solids
Track 3 contains a standard CBL waveform display (WMSG).
Track 2 presents the amplitude (AMP), amplified amplitude (AAMP), filtered cement bond index (FCBI), as well as the computed cement bond index (FCEMBI).
Track 1 presents correlation data (GR), quality control (ECTY), and the average impedance (ZAVG) which provides a quick interpretation of the cement placement.
Track 7 (CEMT) shows the result of both the impedance and variance in determination of solids vs. fluids. Fluids are designated as blue, while cement is indicated by the brown color.
the differences between solids (cement) and liquids.
The ultrasonic impedance map (ZP) is presented in Track 5, which indicates the impedance of the material behind pipe.
Track 4 is the total CBL waveform (WMSGT) which is the ACE™ processing which highlights the collar response.
waveform display (WMSG).
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