Set-Delayed Cement with Pumice and Hydrated Lime

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Set-delayed cement compositions, particularly those with Portland cement, face gelation issues and limited compressive strength at lower temperatures, restricting their effectiveness in surface cementing operations.

Innovation Solution

A set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder, optionally with a dispersant and cement set activator, which remains pumpable for extended periods and develops compressive strength at low temperatures, preventing alkali silicate reactions that cause cracks and deformations in concrete.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If Portland cement is used in set-delayed cement compositions, then the cement can be prepared in advance and stored, but gelation issues occur that limit use and effectiveness

Engineering Contradiction:

Improvestorage timeVSAvoidgelation control

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by replacing Portland cement with a blend of hydrated lime and settable material, and adjusting the water-to-cement ratio to delay gelation and allow extended storage time without compromising reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite material system combining hydrated lime, settable material, and various additives to achieve both extended storage capability and reliable gelation control, avoiding the gelation issues associated with pure Portland cement

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional set-delayed compositions comprising hydrated lime and quartz are used, then they may be effective in some operations, but they do not develop sufficient compressive strength at lower temperatures

Engineering Contradiction:

Improveeffectiveness in operationsVSAvoidcompressive strength at low temperature

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent modifies the composition parameters by incorporating specific ratios of settable material to hydrated lime, and adjusting chemical additives to enable sufficient compressive strength development at lower temperatures while maintaining ease of manufacture

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite cementitious system that combines settable material with hydrated lime in specific proportions, enhancing low-temperature strength development while preserving the operational effectiveness of conventional compositions

Inventive Principle:

Principle #40Composite materials

3Duration of action of stationary object

If the cement composition remains in pumpable fluid state for extended periods, then it can be stored and transported conveniently, but gelation issues may occur that limit effectiveness

Engineering Contradiction:

Improvepumpable storage timeVSAvoidcement effectiveness

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent optimizes the water-to-cement ratio and chemical composition parameters to extend the pumpable fluid state duration while preventing premature gelation, allowing convenient storage and transport without compromising cement effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces chemical additives as intermediaries that delay the gelation process, allowing the cement composition to remain pumpable for extended periods while maintaining its effectiveness when activated

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition effectively remains in a pumpable state for extended periods, develops reasonable compressive strength at low temperatures, and mitigates alkali silicate reactions, enhancing the durability and stability of concrete in various applications.

Implementation Method 1

A set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder

Methodology Applied

Scientific EffectSet retardation:

Implementation Method 2

A set-delayed cement composition comprising water, pumice, hydrated lime... develops compressive strength at low temperatures

Methodology Applied

Scientific EffectCement hydration: Mineral Hydration

Implementation Method 3

preventing alkali silicate reactions that cause cracks and deformations in concrete

Methodology Applied

Scientific EffectAlkali silicate reaction prevention:

Data Source

PatentUS10195764B2Set-delayed cement compositions comprising pumice and associated methods

Publication Date: 2019.02.05 HALLIBURTON ENERGY SERVICES INC

AI summary

Disclosed is a method of forming a set cement shape. The method comprises providing a set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder; forming the set-delayed cement composition into a shape; and allowing the shaped set-delayed cement composition to set.