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Updated: Jun 8, 2025

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
09:32

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Published on: November 20, 2014

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评估和优化用于220°C超深井固的水泥泥泥系统

Zhi Zhang1,2,3,4, Zhengqing Ai1,2,3,4, Lvchao Yang1,2,3,4

  • 1R&D Center for Ultra Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, China.

Materials (Basel, Switzerland)
|November 9, 2024
PubMed
概括

这项研究优化了中国最深井 (11,100米) 面临极端温度和压力的水泥泥. 关键的发现包括防止过度设计,并通过和化合物确保长期强度.

关键词:
异常的凝异常的凝添加剂 添加剂 添加剂抗逆向材料是一种抗逆向材料.流体流失是流体的损失.油井水泥水泥是油井中的一个.强度回归的强度回归.超深井是非常深的井.

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Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way07:42

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Hydration of Cement

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...
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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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Types of Cement II01:22

Types of Cement II

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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Strength and Heat of Hydration01:29

Strength and Heat of Hydration

The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
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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.
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Types of Cement I01:21

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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.
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