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Related Concept Videos

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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In Situ-Prepared Nanocomposite for Water Management in High-Temperature Reservoirs.

Hui Yang1, Jian Zhang2,3, Zhiwei Wang2,3

  • 1Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Gels (Basel, Switzerland)
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Summary

This study introduces a novel hydrogel for enhanced oil recovery (EOR) that effectively controls water in high-temperature reservoirs. The polyacrylamide-phenolic resin-silica sol composite gel offers a significantly extended gelation time for improved deep water shutoff.

Keywords:
high-temperature resistancenanocompositewater management

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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Polymer Chemistry

Background:

  • Enhanced oil recovery (EOR) requires effective water control in high-temperature reservoirs.
  • Conventional polymer gels have limited application due to short gelation times at high temperatures (>120 °C).

Purpose of the Study:

  • To develop a novel hydrogel system for in-depth water shutoff and conformance control in high-temperature EOR applications.
  • To enhance gelation kinetics and microstructure for improved performance under extreme conditions.

Main Methods:

  • In situ cross-linking of polyacrylamide (PAM) with phenolic resin (PR), reinforced by silica sol (SS) nanoparticles.
  • Utilized bottle tests, rheology, SEM, DFT, DSC, QCM-D, contact angle, and core flooding experiments.

Main Results:

  • The composite gel demonstrated a 72-hour gelation period at 130 °C, over 4.5 times longer than conventional systems.
  • Synergistic interactions between organic (PAM-PR) and inorganic (SS) components formed a stable hybrid network.
  • Achieved 92.4% plugging efficiency in core flooding experiments, indicating superior water shutoff capabilities.

Conclusions:

  • The developed hydrogel system effectively addresses water control challenges in high-temperature reservoirs.
  • The organic-inorganic hybrid network provides enhanced mechanical strength and thermal stability for EOR.
  • This research offers a framework for next-generation EOR technologies in extreme reservoir conditions.