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Related Concept Videos

Plasticizers01:31

Plasticizers

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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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Superplasticizers01:30

Superplasticizers

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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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Types of Cement II01:22

Types of Cement II

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Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
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Hydration of Cement01:24

Hydration of Cement

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
353
Types of Cement I01:21

Types of Cement I

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Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
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Placing Concrete01:17

Placing Concrete

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The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
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Related Experiment Video

Updated: Aug 23, 2025

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
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Research on Key Technologies to Improve Cementing Displacement Efficiency.

Jingpeng Wang1,2, Youming Xiong1, Zongyu Lu2

  • 1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan, Chengdu610500, China.

ACS Omega
|October 31, 2022
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Summary

Casing eccentricity in cementing creates uneven annular gaps, hindering drilling fluid displacement in narrow areas. This study develops a model to optimize cementing displacement efficiency with oil-based fluids, ensuring better isolation fluid placement.

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Area of Science:

  • Petroleum Engineering
  • Well Cementing
  • Fluid Dynamics

Background:

  • Casing eccentricity during cementing leads to variable annular clearances, impacting drilling fluid displacement efficiency.
  • Narrow annular gaps experience higher flow resistance, potentially causing delayed or failed displacement.
  • Existing displacement models require adaptation for oil-based drilling fluids and eccentric casing conditions.

Purpose of the Study:

  • To establish a cementing displacement efficiency model for oil-based drilling fluids considering casing eccentricity.
  • To analyze the impact of annulus fluid physical parameters and injection displacement on displacement efficiency.
  • To determine optimal cementing displacement for improved isolation fluid placement.

Main Methods:

  • Developed a cementing displacement efficiency model based on existing calculation methods.
  • Investigated residual drilling fluid layer thickness on casing and wellbore sides.
  • Integrated annular displacement efficiency with circulating pressure drop formulas to analyze displacement effects.
  • Studied the relationship between wellhead cement injection flow and annular retention layer thickness.

Main Results:

  • Annular detention layer thickness increases with casing eccentricity.
  • Detention layer growth rate is higher on the wellbore side compared to the casing side.
  • Increased displacement leads to greater annular circulation pressure drop and equivalent density, elevating cementing risks.
  • Optimized displacement design is crucial for mitigating cementing risks.

Conclusions:

  • The developed model provides a method to calculate reasonable cementing displacement under oil-based drilling fluid conditions.
  • Findings offer significant guidance for enhancing displacement efficiency in oil-based mud cementing operations.
  • Effective displacement design is critical for ensuring well integrity and preventing cementing failures.