Single Blended Cement System for Wide Density and Temperature Ranges
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Solution Overview
Problem
The oil and gas industry faces challenges in designing suitable cementing compositions for wellbore operations due to complex application demands and limited access to equipment in offshore operations, where conventional Portland cements require customization for specific conditions.
Innovation Solution
A method involving a base cement slurry blended with liquid additives, comprising a liquid carrier, class G or blended class G and C cements, and silica fume or fumed silica, with optional additives to achieve desired densities and temperature stability, simplifying logistics and composition design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Portland cements are admixed with various chemical compounds to customize properties for specific well conditions, then the cement system can meet demanding temperature and pressure conditions, but the cement system design becomes complex and requires extensive equipment and additives
Solution Approach 1:
The patent combines multiple cement types (Class G and Class C cements) and additives (silica fume, fumed silica, barite) into a single pre-blended composition that can accommodate a wide range of well conditions. This merging eliminates the need for complex field mixing operations and reduces the number of separate components that must be managed during offshore operations.
Solution Approach 2:
The blended cement composition is designed to serve multiple functions across different well conditions. By incorporating both Class G and Class C cements along with silica fume and barite, the single composition can adapt to varying temperature and pressure requirements, density needs, and wellbore conditions, making it a universal solution for diverse cementing applications.
2Adaptability or versatility
If multiple individual additives and equipment are used to customize cement properties for offshore operations, then specific well conditions can be met, but logistics become cumbersome and operation convenience decreases
Solution Approach 1:
The patent segments the cement system into a pre-blended dry composition that contains all necessary components (Class G cement, Class C cement, silica fume, fumed silica, and barite) in predetermined proportions. This segmentation allows the complex multi-component system to be simplified into a single transportable unit that can be easily deployed in offshore operations without requiring multiple separate additive storage and mixing operations.
Solution Approach 2:
The cement composition is pre-blended and pre-formulated with all necessary additives and materials in the correct proportions before being transported to the well site. This preliminary action of preparing the complete cement system in advance eliminates the need for complex field mixing operations and reduces the logistical burden of managing multiple individual additives during offshore operations.
3Ease of operation
If a single blended cement system is used to cover wide ranges of density and temperatures, then the number of components is reduced and logistics are simplified, but the ability to precisely meet specific well requirements may be compromised
Solution Approach 1:
The patent incorporates materials with different physical and chemical properties (Class G cement for high-temperature stability, Class C cement for early strength, silica fume for density and strength enhancement, barite for weight) that can be activated or become dominant under different well conditions. This allows the single blended composition to adapt its effective properties across a wide range of temperatures and densities, maintaining precision in meeting specific well requirements while simplifying logistics.
Data Source
AI summary
A method of cementing a wellbore penetrating a subterranean formation comprises blending a base cement slurry with one or more liquid additives to provide a cementing composition, the base cement slurry comprising a liquid carrier, a class G cement or a blend of class G and class C cements as defined by the American Petroleum Institute (API) Specification 10A standards (R2015), and silica fume, or fumed silica, or a combination of silica fume and fumed silica, the base cement slurry having a density of about 14 to about 16 ppg; and injecting the cementing composition into the wellbore. The single base cement slurry can be used globally to make cementing compositions having wide ranges of density and temperature stability.