Set-Delayed Cement Compositions with Strength Enhancers
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Solution Overview
Problem
Set-delayed cement compositions used in subterranean operations face challenges with slow compressive strength development, limiting their application in various subterranean cementing operations, particularly in need of enhancements for early and long-term strength.
Innovation Solution
Incorporating strength enhancers such as cement kiln dust, slag, and silica sources into set-delayed cement compositions, which remain pumpable for extended periods, accelerates early strength development and achieves desirable compressive strength when activated, suitable for a broader range of subterranean applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If set-delayed cement compositions are used to remain pumpable for extended periods, then storage and transport capability is improved, but compressive strength development is slowed
Solution Approach 1:
The cement composition is prepared and stored in a delayed-set state before actual use, allowing advance preparation and transport. The composition is activated only when needed for injection, ensuring both extended storage capability and timely strength development upon deployment
Solution Approach 2:
The patent modifies the chemical parameters of the cement composition by incorporating specific additives and adjusting composition ratios to achieve delayed setting while maintaining strength development potential. The activation process changes physical parameters such as temperature and chemical reactivity to trigger rapid strength gain
2Adaptability or versatility
If early strength development is accelerated, then applicability to broader subterranean operations is improved, but the extended pumpable storage time capability is reduced
Solution Approach 1:
The cement composition is prepared in advance with all necessary components for both delayed setting and accelerated strength development, allowing it to be stored pumpable for extended periods while maintaining the capability for rapid strength gain when activated for specific subterranean operations
Solution Approach 2:
The cement composition is designed to serve multiple functions: remaining pumpable for extended storage and transport, and upon activation, providing accelerated early strength development suitable for various subterranean cementing operations including wellbore cementing, plug placement, and fracture sealing
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 use of strength enhancers significantly boosts 24-hour and 72-hour compressive strengths, enabling the set-delayed cement compositions to form a robust and durable cement sheath, effectively supporting pipes and preventing fluid migration in subterranean formations.
Implementation Method 1
a set-delayed cement composition may generally comprise water, pumice, hydrated lime, and a set retarder
Implementation Method 2
set-delayed cement compositions are characterized by remaining in a pumpable fluid state for at least about one day
Data Source
AI summary
Disclosed herein are cement compositions and methods of using set-delayed cement compositions in subterranean formations. An embodiment includes a method of cementing in a subterranean formation comprising: providing a cement composition comprising water, pumice, hydrated lime, a set retarder, and a strength enhancer, wherein the strength enhancer comprises at least one material selected from the group consisting of cement kiln dust, slag, amorphous silica, a pozzolan, and any combination thereof; introducing the cement composition into the subterranean formation; and allowing the cement composition to set in the subterranean formation.