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Related Concept Videos

Hot Weather Concreting01:20

Hot Weather Concreting

Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Microbial Bioremediation of Hydrocarbons01:26

Microbial Bioremediation of Hydrocarbons

Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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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Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
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Diversity of Archaea IV01:29

Diversity of Archaea IV

Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist thermal...
Cold Weather Concreting01:27

Cold Weather Concreting

When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
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High-Temperature-Resistant Composite Lost Circulation Materials for Oil-Based Drilling Fluids: Preparation,

Yue Gao1, Cheng Ma2, Xuan Qi1

  • 1College of Chemical and Materials Engineering, Hainan Vocational University of Science and Technology, Haikou 571126, China.

Molecules (Basel, Switzerland)
|June 12, 2026
PubMed
Summary

A novel composite lost circulation material (LCM) effectively seals fractures in high-temperature oil-based drilling fluids. This high-temperature-resistant material ensures drilling integrity by combining rigid bridging and flexible filling for superior plugging performance.

Keywords:
emulsion polymerizationnanopolymerplugging–inhibitorshale inhibitionthermal stability

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Area of Science:

  • Petroleum Engineering
  • Materials Science

Background:

  • Lost circulation in oil-based drilling fluids (OBDFs) is a critical issue in deep and ultra-deep drilling operations.
  • High temperatures exacerbate the challenge, demanding robust solutions for wellbore stability.

Purpose of the Study:

  • To develop a high-temperature-resistant composite lost circulation material (LCM) for OBDFs.
  • To investigate a synergistic strategy combining rigid bridging-consolidation and flexible embedding-filling for enhanced plugging performance.

Main Methods:

  • Preparation of rigid self-consolidating particles by coating skeleton materials with modified thermosetting resin.
  • Synthesis of flexible oil-absorbing resin via suspension polymerization.
  • Evaluation of material properties including lipophilicity, thermal stability, and oil absorption capacity at 150 °C.

Main Results:

  • The composite LCM demonstrated excellent thermal stability and structural integrity at 150 °C, with an oil absorption capacity of 3.43 g/g.
  • Optimized LCM achieved high compressive strengths (11 MPa in white oil, 5 MPa in base mud) at 150 °C.
  • Effective sealing of 1-3 mm pores with leakage <10 mL and successful consolidation of fractured formations were achieved.

Conclusions:

  • The developed composite LCM offers a promising approach for addressing lost circulation in high-temperature OBDFs.
  • The synergistic mechanism involving rigid bridging, flexible pore filling, and enhanced consolidation provides a dense, high-strength plugging layer.
  • This research contributes to improved drilling efficiency and safety in challenging geological environments.