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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is critical—it...
Fineness of Cement01:15

Fineness of Cement

The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Soundness of Cement01:17

Soundness of Cement

The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create ettringite,...
Porosity and Absorption of Aggregate01:20

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Strength of Cement01:20

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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
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Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
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Improved processing for oil well cement evaluation-a with theoretical and laboratory data.

C V Kimball1

  • 1Schlumberger-Doll Res., Ridgefield, CT.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1992
PubMed
Summary

Normalized single mode (NSM) processing improves cement impedance measurements from ultrasonic data. This new technique significantly reduces errors caused by casing variations and noise in oil field applications.

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Area of Science:

  • Geophysics
  • Materials Science
  • Signal Processing

Background:

  • Accurate cement impedance measurement is crucial for well integrity in oil and gas operations.
  • Existing ultrasonic processing methods can be sensitive to environmental factors like casing variations and noise.
  • The development of robust signal processing techniques is needed to enhance measurement reliability.

Purpose of the Study:

  • To introduce and evaluate a novel signal processing technique, normalized single mode (NSM) processing, for measuring cement impedance from ultrasonic pulse-echo waveforms.
  • To compare the performance of NSM processing against a conventional method (W2/W1) under various environmental conditions.
  • To assess the effectiveness of NSM processing in reducing measurement errors and variance in laboratory and field data.

Main Methods:

  • Developed a physical model representing the ultrasonic transducer using a continuous plane wave kernel.
  • Implemented narrowband filtering to isolate a single resonant mode, normalizing processing parameters to the modal frequency.
  • Conducted digital simulations and laboratory experiments using mathematical models and field data to compare NSM and W2/W1 processing.
  • Evaluated performance based on environmental factors including casing thickness, eccentering, and added Gaussian noise.

Main Results:

  • NSM processing demonstrated a significant reduction in cement impedance errors caused by variations in casing thickness, eccentering, and Gaussian noise on model data.
  • For smooth, machined casings, NSM and W2/W1 processing yielded comparable results in laboratory tests.
  • In actual oil field casing samples, NSM processing significantly decreased measurement error and variance compared to the conventional method.

Conclusions:

  • Normalized single mode (NSM) processing offers a more robust and accurate method for measuring cement impedance using ultrasonic pulse-echo techniques.
  • The NSM technique effectively mitigates common sources of error encountered in downhole well logging applications.
  • NSM processing represents a significant advancement for improving the reliability of cement evaluation in the oil and gas industry.