Advanced Cement Evaluation (ACE)
| The ACE
process helps provide quick, accurate information on the
cement bond, even with foamed cements, and works with
standard logging tools and procedures. |
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| Traditional cement analysis, using the
standard cement bond log (CBL) or any other cement
evaluation tool, has severe limitations when used to
evaluate foamed cements. Lightweight or foamed cements
affect the traditional methods of determining zonal
isolation which may create the misleading impression
that the cement bond is inadequate and can lead to the
ordering of expensive and completely unnecessary
remedial cementing. |
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| The ACE
process is a new way of interpreting the CBL log and
other cement evaluation tool data that is already being
captured. Although the ACE process was originally
developed for lightweight, foamed or complex cements,
experience and experiments have shown that it provides a
superior method for interpretating any type of cement.
Above all it gives clear answers to the most urgent
questions: |
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- How good is my zonal isolation?
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| The ACE
process yields its greatest benefit when the CBL log and
ultrasonic tools are combined. The ACE process will
provide excellent results with either conventional or
ultrasonic digital data. CBL log waveform processing
using the ACE process to highlight the differences
between bonded, partially bonded, and free pipe. The ACE
process can help determine the presence of cement
between two casing strings, which is extremely difficult
to quantify with previous logs and/or interpretation
procedures. |
|
| These
extraordinary results are the product of a new technique
based on a statistical-variation process to distinguish
cement from fluid, even when both have the same value.
This process actually will use two different methods to
determine zonal isolation, the original tool data, and
the activity level of the data. Through this process,
the activity level is determined and will allow easy
differentiation between solids and fluids. In addition,
new bond-index curves and special log presentations have
been developed to make interpretation quick and
unambiguous. |
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| The ACE
process works on every cement evaluation tool that
Halliburton offers as well as effectively evaluating
data from other service companies. Not only does this
method work on standard CBL data, rotating, and
stationary ultrasonic data, it also provides detailed
information on segmented bond logs. |
|
| Advanced
Cement Evaluation has been proven effective on cementing
jobs in all parts of the world, on every type of cement
now in use. It saves time and money by eliminating
countless unnecessary squeeze jobs and associated
expenses. Reducing the amount of unnecessary remedial
cement operations will allow the customer to reduce
operational expenses and contribute to the bottom
line. |
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| » ACE Process Features |
| The ACE
process contains the following features: |
- Delivers a reliable cement bond index
|
- Works with existing logging procedures
|
- Enhances current logs to achieve a better
understanding of zonal isolation
|
- Works for any cement – conventional, complex,
lightweight, or foam
|
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| » ACE Process Benefits |
| The ACE
process offers the following benefits: |
- Helps improve cement interpretation for multiple
casing strings
|
- Delivers answers right away – in minutes, on
location, using your log or data tape
|
- Helps provide accurate and dependable cement bond
interpretation regardless of the service
company
|
- Saves time and money by helping eliminate
countless unnecessary squeeze jobs and associated
expenses
|
- Reduces the customer’s operational expenses and
contributes to the bottom line by helping to eliminate
unnecessary remedial cement
operations
|
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| Track 1
presents tool position, quality control, along with
correlation data. Track 2 presents the amplitude, amplified
amplitude, cement bond-index, and the average impedance which
l indicate the quality of the cement placement. Track 3
contains a standard CBL waveform display. Track 4 is the total
CBL waveform including the variance processing which
highlights the collar response. The ZP map is presented in
Track 5, which indicates the impedance of the material behind
pipe. Track 6 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. Tracks 7-15 provide the minimum and average of each
sector of the ZP image. When the average impedance is greater
than 2.7 the shading is brown indicating
cement. |
|
| Inputs |
Digital recording of
the cement bond log whether standard CBL, Ultrasonic scanning
or stationary, or segmented bond |
| Outputs |
Complete analysis of the cement
bond including bond indexes
Cement images to provide an
accurate assessment of the zonal
isolation |
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