Weighted Elastomers for Cement Segregation Control
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Solution Overview
Problem
Cement compositions containing both elastomers and weighting agents often experience segregation issues, leading to non-uniform density distribution, which can result in failure to meet design specifications, increasing complexity and cost due to the need for additional additives and monitoring.
Innovation Solution
Incorporating a weighted elastomer with a specific gravity of at least 1.1, where the weighting agent is attached to the elastomer's outer surface, such as pumicite or perlite, to maintain uniform density distribution and prevent segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If both elastomers and weighting agents are included in a cement composition, then the mechanical properties and density are improved, but segregation occurs leading to non-uniform density distribution
Solution Approach 1:
The patent combines elastomers and weighting agents into a single integrated component called a 'weighted elastomer'. The weighting agent is attached to the outer surface of the elastomer, creating a composite structure that functions as one unit. This merging eliminates the segregation problem that occurs when elastomers and weighting agents are used separately, as they now move and distribute together as a single phase within the cement composition.
Solution Approach 2:
The invention creates a composite material structure where a weighting agent (such as barite, hematite, or sand) is attached to the surface of an elastomer particle. This composite structure combines the beneficial properties of both components: the elasticity and ductility of the elastomer with the high density of the weighting agent, while preventing segregation that would occur in a simple mixture.
2Quantity of substance
If elastomers and weighting agents are used separately in cement composition, then density and mechanical properties are enhanced, but additional additives and monitoring are required increasing complexity and cost
Solution Approach 1:
By merging the elastomer and weighting agent into a single weighted elastomer component, the patent eliminates the need for separate additives and reduced the monitoring requirements. The composite structure achieves the desired density and mechanical properties in one ingredient, simplifying the cement formulation and reducing operational complexity.
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 weighted elastomers ensures a consistent density distribution, reducing segregation issues and simplifying the formulation process, thereby enhancing the performance and reliability of cement compositions in subterranean applications.
Implementation Method 1
The weighted elastomer may have a specific gravity of at least about 1.1. The weighting agent generally tend to sink while the elastomers tend to float, which can leave certain areas with little or no weighting agent and other areas with little or no elastomer.
Data Source
AI summary
Methods and compositions are provided that relate to weighted elastomers. The weighted elastomers may comprise an elastomer and a weighting agent attached to an outer surface of the elastomer. An embodiment includes a method of cementing that comprises providing a cement composition containing cement, water, and a weighted elastomer. In addition, the cement composition may be introduced into a subterranean formation and allowed to set therein.