Cementitious Composition Reducing CO2 Emissions in Oil Well Cementing
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Solution Overview
Problem
Portland cement manufacturing generates significant CO2 emissions and energy consumption, necessitating the development of environmentally friendly cement products that reduce environmental impact while maintaining performance for oil and gas well applications.
Innovation Solution
A cementitious composition comprising hydraulic cement, a source of free lime and alkali ions, calcium carbonate, calcium sulfate, and an organic component, formulated to provide controlled viscosity and set time, ensuring effective placement and mechanical integrity in wellbores, with a hydraulic cement content of 50% to 90% and other components within specific weight percentages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional Portland cement is used for oil well cementing, then mechanical strength and reliability are achieved, but CO2 emissions and energy consumption increase significantly
Solution Approach 1:
The patent modifies the chemical composition parameters of Portland cement by incorporating supplementary cementitious materials (fly ash, slag, natural pozzolans) to replace a portion of the clinker, thereby reducing CO2 emissions and energy consumption while maintaining the required mechanical strength and reliability for oil well cementing applications
Solution Approach 2:
The invention creates composite cement formulations by combining Portland cement with supplementary cementitious materials, resulting in a composite material that reduces environmental impact through lower clinker content while preserving the necessary performance characteristics for wellbore cementing
2Object-affected harmful factors
If cement composition is modified to reduce environmental impact, then CO2 emissions and energy consumption decrease, but cement performance may be compromised
Solution Approach 1:
The patent optimizes the proportions of supplementary cementitious materials and adjusts curing parameters (temperature, pressure, time) to ensure that the modified cement composition achieves the required compressive strength (200-4400 psi at 8 hours) while maintaining reduced environmental impact
Solution Approach 2:
The invention tailors the cement composition to specific wellbore application requirements, adjusting the blend of supplementary materials and curing conditions to achieve appropriate strength development at different depths and temperatures within the wellbore
3Object-affected harmful factors
If hydraulic cement content is reduced to lower environmental impact, then manufacturing emissions decrease, but thickening time and placement characteristics may be affected
Solution Approach 1:
The patent adjusts the water-to-cement ratio and incorporates set retarders in the slurry formulation to control thickening time (minimum 90 minutes) while maintaining reduced hydraulic cement content, thereby lowering manufacturing emissions without compromising placement characteristics
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 minimum 8-hour compressive strength of 200 to 4400 psi, suitable for various wellbore applications, including primary cementing, plug-back operations, and remedial cementing, while reducing environmental impact and meeting or exceeding API performance specifications.
Implementation Method 1
a hydraulic cement, a source of free lime and alkali ions, a source of calcium carbonate, a source of calcium sulfate and an organic component... when the composition is mixed with water... A set cement product is formed in the wellbore
Data Source
AI summary
Cementitious compositions are provided that can be use in drilling oil and gas well applications. The compositions include a source of hydraulically settable cement, calcium carbonate, free lime and alkali ions, calcium sulfate and an organic component. Methods for cementing a casing and liners and for remedial operations such as plugging back and squeeze cementing are also provided.