Flue Gas Waste Acidizing for Carbonate Reservoirs
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Solution Overview
Problem
Existing technologies for flue gas desulfurization and denitrification do not effectively utilize the products, leading to secondary pollution, and traditional acid fracturing methods face issues such as short acting distance, strong corrosiveness, and low efficiency in carbonate reservoirs.
Innovation Solution
A method that couples flue gas desulfurization and denitrification with reservoir acidizing, using a desulfurizing and denitrating agent and an oxidizing agent as curing agents, to generate an acid liquor from waste liquor, which is then injected into a carbonate reservoir for acidizing and stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional acid fracturing is used in carbonate reservoirs, then the acidizing process can be performed, but the acting distance is short and the reaction rate is too fast
Solution Approach 1:
The patent changes the physical state of nitric acid from liquid to solid powder form, and controls the hydrolysis rate through curing agent selection and reservoir temperature conditions, transforming the rapid liquid-phase reaction into a controlled solid-phase hydrolysis process that extends acting distance while maintaining effective reaction rates
2Length of moving object
If nitric acid powdered acidizing is used, then the acting distance is extended, but the corrosiveness increases and the cost rises
Solution Approach 1:
The patent incorporates curing agents (urea, ethanolamine, ammonia, or multidentate ligands) that beforehand neutralize the strong corrosiveness of nitric acid powder, creating a buffered system that reduces harmful corrosion effects while preserving the acidizing functionality and extending acting distance
Solution Approach 2:
The patent creates a composite acidizing system combining nitric acid powder with curing agents and optional corrosion inhibitors, where the composite material properties provide extended acting distance while the curing agent matrix mitigates corrosiveness
3Ease of operation
If traditional curing agents are used with nitric acid powder, then the operation is simplified, but the alkalinity is weak and acting distance is limited
Solution Approach 1:
The patent enhances the alkalinity parameter by selecting curing agents with stronger basic properties, particularly multidentate ligands that provide superior alkalinity compared to traditional weak bases like urea, thereby extending acting distance while maintaining operational simplicity
4Object-affected harmful factors
If desulfurization and denitrification products are discharged or stored, then the pollution is controlled, but secondary pollution such as water eutrophication occurs
Solution Approach 1:
The patent converts the harmful nitrogen-containing waste liquor from desulfurization and denitrification processes into a beneficial acidizing agent for carbonate reservoirs, where the nitrates and sulfates serve as the active acidizing components, eliminating the need for discharge or storage and preventing water eutrophication
Solution Approach 2:
The patent makes the waste liquor serve multiple functions: it acts as both the acidizing agent and the source of nitric and sulfuric acid through hydrolysis, while simultaneously addressing environmental pollution concerns, thereby giving the waste product universal utility
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
This method effectively reduces acidizing costs, achieves deep acidizing, and increases production and injection in oil-water wells, while also controlling environmental pollution and preventing secondary pollution such as water eutrophication.
Implementation Method 1
NOx and SOx in the flue gas react with a desulfurizing and denitrating agent to generate corresponding nitrates and sulfates
Implementation Method 2
reservoir temperature enables the nitrates and sulfates in the waste liquor to be slowly hydrolyzed to generate H2SO4 and HNO3
Implementation Method 3
the generated acid reacts with the reservoir to achieve effects of acidizing
Implementation Method 4
the desulfurizing and denitrating agent coordinate with Ca2+, Mg2+ and Fe3+ to achieve corrosion inhibition and iron ion stability in pipelines
Data Source
AI summary
The last sentence of the abstract has been deleted because it refers to purported merits of the invention. The abstract should not refer to purported merits or speculative applications of the invention and should not compare the invention with the prior art, therefore the abstract has been amended to delete the last sentence by Examiner's amendment.