Cement Slurry Modeling for Low-Carbon Well Barriers
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Solution Overview
Problem
The challenge in well cementing is to develop cement compositions that provide effective barriers and support for wellbores while reducing carbon emissions associated with cement production, which is difficult due to the direct relationship between cement material composition and carbon emissions.
Innovation Solution
A method involving cement property models and a carbon footprint model is used to determine feasible cement compositions that meet required properties and minimize carbon emissions by utilizing physicochemical characterization techniques to analyze available cement components, and then iteratively selecting and ranking compositions based on carbon emissions and property constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cement compositions are used to ensure effective barrier performance and wellbore support, then cement performance requirements are met, but carbon emissions increase
Solution Approach 1:
The patent applies parameter changes by systematically varying the composition parameters of cement blends, specifically adjusting the proportions of Portland cement, supplementary cementitious materials (SCMs), and other additives. By changing these compositional parameters within defined ranges, the method optimizes the balance between achieving required cement performance (barrier integrity, strength, durability) and minimizing carbon emissions through reduced Portland cement content and increased use of lower-carbon SCMs.
Solution Approach 2:
The patent employs composite materials by creating cement blends that combine multiple cementitious components including Portland cement, Class F fly ash, Class C fly ash, and other SCMs. This composite approach allows the leveraged synergistic effects of different materials to achieve both performance requirements and carbon reduction goals, where each component contributes specific properties that collectively satisfy both technical and environmental criteria.
2Reliability
If cement composition is optimized for performance requirements, then wellbore support and barrier functions are ensured, but the complexity of composition selection increases
Solution Approach 1:
The patent applies segmentation by dividing the complex cement composition selection process into systematic, manageable components. The method segments the composition design into distinct categories of cementitious materials (Portland cement, Class F fly ash, Class C fly ash, and other SCMs), defines specific compositional ranges for each segment, and uses a structured evaluation framework that assesses each segment's contribution to performance and carbon emissions separately before integrating them into the final blend design.
Solution Approach 2:
The patent uses parameter changes to simplify composition selection by establishing specific compositional ranges and ratios for different cement components. By defining parameters such as the ratio of Portland cement to SCMs, water-cement ratio, and additive concentrations within optimized ranges, the method transforms the complex multi-variable optimization problem into a more manageable process that systematically generates feasible compositions meeting both performance and carbon criteria.
3Object-generated harmful factors
If alternative energy sources are used to power equipment, then carbon emissions from drilling and completion operations are reduced, but cementing operations remain difficult to decarbonize due to material composition requirements
Solution Approach 1:
The patent applies parameter changes to address the cement production decarbonization challenge by systematically adjusting the material composition parameters. The method defines specific ranges for Portland cement content, SCM content, water-cement ratio, and additive concentrations that optimize the carbon footprint while maintaining required cement properties. This parameter optimization enables cementing operations to be partially decarbonized through compositional changes, complementing alternative energy sources for other wellbore operations.
Data Source
AI summary
A method of producing a cement composition with reduced carbon emissions may include: defining cement constraints comprising at least one cement property; calculating a set of cement compositions which satisfy the cement constraints, using cement property models corresponding to the cement constraints; calculating a carbon emission associated with each of the cement compositions in the set of cement compositions using a carbon footprint model; selecting a cement composition from the set of cement compositions; and preparing the cement composition.