Ultra-Low Portland Cement Blend for Wellbore Service
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Solution Overview
Problem
The cementing industry faces challenges in reducing its carbon footprint due to energy-intensive processes that produce greenhouse gases, particularly with conventional cement slurries used in subterranean cementing operations.
Innovation Solution
A cementitious composition with ultra-low Portland cement content, combined with pozzolan, is used to create a cement blend that initiates pozzolanic reactions, reducing the carbon footprint while maintaining adequate compressive strength and thickening time, allowing for efficient cementing operations in wellbores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional cement slurries are used in subterranean cementing operations, then adequate compressive strength and thickening time are achieved, but carbon footprint increases due to energy-intensive manufacturing processes
Solution Approach 1:
The patent changes the chemical composition parameters of the cement slurry by using ultra-low Portland cement content (0.1-10 wt%) combined with specific pozzolan materials and chemical additives. This parameter change reduces the carbon footprint while maintaining adequate compressive strength through the synergistic effects of the modified composition
Solution Approach 2:
The patent creates a composite cementitious composition by combining ultra-low Portland cement with pozzolan materials (such as fly ash, silica fume, or natural pozzolans) and chemical additives. This composite approach allows the slurry to achieve required performance characteristics while using significantly less high-carbon Portland cement
2Object-generated harmful factors
If Portland cement content is reduced to lower carbon footprint, then environmental impact decreases, but compressive strength and thickening time control become challenging
Solution Approach 1:
The patent introduces chemical additives as intermediaries that mediate between the ultra-low Portland cement content and the required thickening time control. These additives (such as retarders or accelerators) enable precise control of setting characteristics despite the reduced cement content, resolving the contradiction between environmental goals and operational control
3Object-generated harmful factors
If Portland cement content is reduced to lower carbon footprint, then environmental impact decreases, but compressive strength achievement becomes difficult
Solution Approach 1:
The patent develops a composite material system where ultra-low Portland cement is combined with pozzolan materials and chemical additives that work synergistically to achieve adequate compressive strength. The pozzolans provide latent hydraulic properties and the additives enhance binding, allowing strength development with minimal Portland cement
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating specific ratios of pozzolan materials and chemical additives that enable compressive strength achievement at ultra-low Portland cement contents, transforming the traditional cement chemistry paradigm
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 achieves a reduced carbon footprint of less than 150 kg CO2 per barrel, with increased compressive strength and controlled thickening time, addressing the environmental impact and operational efficiency of cementing processes.
Implementation Method 1
the cement blend comprises Portland cement and pozzolan, wherein the Portland cement initiates pozzolanic reactions
Implementation Method 2
a cement slurry is placed in the annulus and permitted to set into a hard mass
Data Source
AI summary
Disclosed herein is a method of servicing a wellbore penetrating a subterranean formation, comprising: placing a cementitious composition of the type disclosed herein into the wellbore. The cementitious composition comprises a cement blend and water, wherein the cement blend comprises Portland cement and pozzolan, wherein the Portland cement is present in an amount of from equal to or greater than about 0.01 wt. % to equal to or less than about 25.0 wt. % based on the total weight of the cement blend.