Chelating-Free Descaling Fluids for Oilfield Scale Control
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Solution Overview
Problem
Scale formation in pipelines and equipment in the oil and gas industry leads to reduced efficiency, safety hazards, and operational issues, with existing chemical treatments like chelating agents posing environmental and economic challenges.
Innovation Solution
A chelating agent-free treatment fluid comprising an aqueous base fluid, an alkaline descaling agent, and a polyacid is used to reduce and prevent scale deposits, including pseudo-scale deposits, through a one-step process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chelating agents are used to remove scale deposits, then scale removal effectiveness is improved, but environmental impact and disposal complexity increase
Solution Approach 1:
The patent extracts and removes chelating agents from the treatment fluid composition, replacing them with alternative chemicals that achieve scale removal without the environmental harms associated with chelating agents
Solution Approach 2:
The patent employs biodegradable alternatives to persistent chelating agents, using materials that break down naturally and can be disposed of more easily without long-term environmental accumulation
2Reliability
If chelating agents are used to remove scale deposits, then scale removal effectiveness is improved, but disposal requirements and costs increase
Solution Approach 1:
The patent extracts and removes chelating agents from the treatment fluid composition, replacing them with alternative chemicals that achieve scale removal without the environmental harms associated with chelating agents
Solution Approach 2:
The patent facilitates easier disposal of treatment fluids by using biodegradable components that can break down naturally, reducing the complexity and cost of waste treatment and disposal operations
3Reliability
If acids and chelating agents are used for scale mitigation, then scale deposit reduction is improved, but corrosion risk increases
Solution Approach 1:
The patent extracts and removes chelating agents from the treatment fluid composition, replacing them with alternative chemicals that achieve scale removal without the environmental harms associated with chelating agents
Solution Approach 2:
The patent uses composite treatment fluid formulations combining alkaline substances, acids at controlled concentrations, and alternative scale-inhibiting chemicals to achieve scale removal while minimizing corrosion through balanced chemical interactions
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 treatment fluid effectively reduces scale deposits by up to 100% and prevents pseudo-scale formation, avoiding the environmental and economic drawbacks of chelating agents, while utilizing a wide range of aqueous fluids and requiring less polyacid.
Implementation Method 1
chemical treatments often involve acids (such as hydrochloric acid or acetic acid), and chelating agents... These chemicals work by altering the solubility of the scale-forming minerals
Implementation Method 2
These chemicals work by altering the solubility of the scale-forming minerals or by disrupting their crystal growth
Data Source
AI summary
Methods for reducing and/or preventing scale deposits comprising: contacting one or more components with a treatment fluid, the treatment fluid comprising a mixture of: an aqueous base fluid; an alkaline descaling agent; and a polyacid, thereby reducing the scale deposits on said one or more components, and reducing the formation of pseudo-scale deposits on said one or more components. The treatment fluids may optionally comprise a water-wetting surfactant, a demulsifier, and/or a mutual solvent.