Dry Cement Additive Powder for Wellbore Handling
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Solution Overview
Problem
Existing wellbore cementing techniques require liquid additives, which increase complexity and cost due to the need for additional personnel and equipment for handling and storage, and often only have solid forms available, limiting their application.
Innovation Solution
A wellbore cement composition and method using a dry cement composition with unhydrated cement powder and additive powder, where a liquid additive is absorbed by solid carrier particles, allowing for simplified handling and enhanced performance, such as delayed set times, without the need for extra equipment or personnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid additives are used in cement slurry, then desired performance characteristics (setting time, density, viscosity, strength) are achieved, but additional personnel and equipment for storage, handling, and dosing are required, increasing complexity and cost
Solution Approach 1:
The patent transforms the physical state of the additive from liquid to solid form by absorbing the liquid additive onto solid carrier particles. This parameter change eliminates the need for liquid handling equipment while maintaining the additive's functional properties in the cement slurry
Solution Approach 2:
Solid carrier particles serve as an intermediary medium that holds the liquid additive. The carrier particles absorb and transport the liquid additive in a solid form, allowing it to be mixed with cement powder before transport without requiring separate liquid storage and dosing equipment
2Reliability
If liquid additives are used in cement slurry, then desired performance characteristics are achieved, but liquid additives require additional personnel and equipment for storage and handling, increasing operational cost
Solution Approach 1:
By changing the physical state from liquid to solid through absorption onto carrier particles, the additive becomes easier to handle like conventional cement powder, eliminating the need for specialized liquid storage tanks, pumps, and dosing equipment
Solution Approach 2:
The liquid additive is merged with solid carrier particles to form a combined solid additive composition that can be stored and handled together with cement powder, simplifying operational procedures and reducing personnel requirements
3Ease of operation
If solid additives are used instead of liquid additives, then equipment and personnel costs are reduced, but some desired additive functionalities are only available in liquid form
Solution Approach 1:
Solid carrier particles act as an intermediary that enables liquid additives to be handled as solids. The carrier particles absorb the liquid additive, allowing it to be mixed with cement powder in dry form while still providing the functional benefits of the liquid additive when dissolved in the slurry
Solution Approach 2:
The patent changes the delivery form of the additive from liquid to solid without altering its chemical composition or functional properties. The liquid additive is absorbed onto solid carriers, transforming its physical state for easier handling while maintaining its effectiveness in the cement slurry
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 absorption of liquid additives by solid carrier particles simplifies handling, reduces costs, and provides improved performance characteristics, such as extended set times, while maintaining the quality of the cement, by allowing the use of known liquid additives in a solid form, reducing errors and complexity in wellbore cementing processes.
Implementation Method 1
The additive powder is formulated from ingredients including a liquid additive for cement and solid carrier particles. The liquid additive is absorbed by the solid carrier particles.
Data Source
AI summary
A wellbore cement composition includes substantially unhydrated cement powder and additive powder for cement. The additive powder is formulated from ingredients including a liquid additive for cement and solid carrier particles. The liquid additive is absorbed by the solid carrier particles. A wellbore cementing method includes using a dry cement composition, adding water to the dry cement composition, forming a cement slurry, placing the slurry in a wellbore, and setting the placed slurry. The dry cement composition contains substantially unhydrated cement powder and retarder powder for cement. The retarder powder contains a retarder absorbed by solid carrier particles.