Lassenite Cement Compositions for Strength Maintenance
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Solution Overview
Problem
Current cement compositions for subterranean applications require both a pozzolan to reduce costs and a strength retrogression inhibitor to maintain compressive strength, especially at elevated temperatures, but using two separate additives increases complexity and cost.
Innovation Solution
Incorporating Lassenite, a crystalline porous aluminosilicate with pozzolanic activity, which functions as both a strength retrogression inhibitor and cost-effective filler, into cement compositions to enhance compressive strength and prevent strength decline over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both a pozzolan and a strength retrogression inhibitor are included in the cement composition, then cost reduction and strength maintenance are achieved, but device complexity and overall cost increase
Solution Approach 1:
Lassenite is incorporated into the cement composition to perform multiple functions simultaneously: it acts as a pozzolan for cost reduction and as a strength retrogression inhibitor for maintaining compressive strength at elevated temperatures. This multi-functionality eliminates the need for separate additives, reducing complexity while achieving both cost savings and performance requirements.
Solution Approach 2:
The patent combines the functions of pozzolan and strength retrogression inhibitor into a single material - Lassenite. By merging these two separate additive functions into one compound, the formulation simplifies the cement composition while simultaneously achieving cost reduction and strength maintenance objectives.
2Quantity of substance
If a pozzolan is included in the cement composition, then cost is reduced, but compressive strength may be adversely affected
Solution Approach 1:
Lassenite serves dual purposes: as a pozzolan it reduces cement cost by replacing expensive cementitious materials, and simultaneously as a strength retrogression inhibitor it prevents strength loss at elevated temperatures. This multi-functional approach ensures both cost reduction and strength maintenance are achieved together rather than traded off against each other.
3Strength
If a strength retrogression inhibitor is included in the cement composition, then compressive strength is maintained at elevated temperatures, but cost increases
Solution Approach 1:
Lassenite provides dual functionality by acting as both a pozzolan (cost-reducing filler) and a strength retrogression inhibitor (strength-maintaining additive). This eliminates the need to choose between cost reduction and strength maintenance, as both benefits are achieved simultaneously through a single material incorporation.
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
Lassenite maintains or increases compressive strength of cement compositions at elevated temperatures, reducing the need for additional additives and lowering overall costs while ensuring desirable properties like setting time are not adversely affected.
Implementation Method 1
a pozzolan is a siliceous or siliceous and aluminous material which, in itself, possesses little or no cementitious value but which will, in finely divided form and in the presence of water, chemically react with a source of calcium at a temperature of 71° F. (22° C.) to form compounds possessing cementitious properties
Implementation Method 2
When a pozzolan is mixed with water, the silicate phases of the pozzolan can undergo a hydration reaction and form hydration products of calcium silicate hydrate (often abbreviated as C-SH)
Data Source
AI summary
Cement compositions and methods of making the same are provided. The composition comprises cement or lime, water and Lassenite, a pozzolanic strength retrogression inhibitor.